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Population dynamics of Penilia avirostris and Pseudevadne tergestina (Diplostraca) in the Veracruz Reef System National Park, southwest Gulf of Mexico
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Cházaro-Olvera, Sergio

; Winfield, Ignacio

; Ortiz, Manuel

; Torres-Cabrera, Diego Alfonso

Latin american journal of aquatic research

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Jul 2024, Volumen 52 Nº 3 Paginas 486 - 500

Resumen: En | Texto: En | PDF: En

ABSTRACT The present study aimed to evaluate the ecology considering distribution, abundance, population structure, and fecundity of the marine diplostraceans Penilia avirostris and Pseudevadne tergestina in the Veracruz Reef System National Park, southwest Gulf of Mexico. Surface samples were collected with a 300 μm mesh plankton net at 26 sampling sites in June, August, October (2011), May (2012) and June (2013). Temperature, salinity, and dissolved oxygen were measured in situ. The temperature range was 26.53 ± 0.41 and 29.29 ± 0.27°C, salinity between 33.43 ± 0.49 and 35.91 ± 0.09, and dissolved oxygen between 2.92 ± 0.08 and 6.56 ± 0.08 mg L-1. P. avirostris and P. tergestina presented the highest density, with 2200 ind 100 m-3 in June and 5980 ind 100 m-3 in October, respectively. Four stages were determined in P. avirostris. In P. tergestina, there were five instars, with males in August and October. The size of parthenogenic females of P. avirostris was 773.4 ± 20.08 μm. In P. tergestina, it was 637.6 ± 49.28 μm. The number of embryos in P. avirostris was 2 to 7, and in P. tergestina, 2 to 8 embryos. The correlations between body length and the number of embryos in both species were statistically significant under the potential model (r > 0.68 for both species, P < 0.001). The transects with the highest abundance were the northern and the southern zones because they are far from the influence of the Jamapa River. The density of these crustaceans is related to optimal temperature, salinity, and dissolved oxygen values. The low proportions obtained from gamogenic individuals of P. avirostris and P. tergestina suggest that in tropical and subtropical regions, gamogenesis is not crucial for the life cycle of these organisms.

https://doi.org/10.3856/vol52-issue3-fulltext-3184

First record of the potential invasive crab Rhithropanopeus harrisii (Gould, 1841) in the Uruguayan coast Gould, Gould (Gould 1841 184 18 1
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Machado, Irene

; Pasquariello, Soledad

; Vieira, Rony

; Calliari, Danilo

; Rodríguez-Gallego, Lorena

Ocean and Coastal Research

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2024, Volumen 72 elocation e24023

Resumen: En | Texto: En | PDF: En

ABSTRACT Abstract: Rhithropanopeus harrisii (Brachyura, Panopeidae) is a small euryhaline and eurythermal omnivorous crab native to the Northwest Atlantic. However, it has become an invasive species in various estuaries and coastal areas far from its original habitat, most likely due to intercontinental shipping. Once it establishes itself in one location, it can spread to neighboring regions via maritime currents. In 1982, this species was found in South America, specifically in Lagoa dos Patos, Brazil. In this study, we present the first record of R. harrisii larvae in Uruguay, located in the coastal marine zone of Laguna de Rocha, approximately 300 km south of Lagoa dos Patos. It was discovered during a study that involved 15 plankton samplings, conducted from February 2016 to February 2017. Notably, the observation of R. harrisii larvae was limited to the coastal zone during the summer and autumn of 2016 (February to April). All observed larvae were in the zoeal stage, and their abundance ranged from three to 185 individuals per 100 m3. The temperature and salinity values recorded during sampling surveys with the presence of R. harrisii ranged from 19 to 22.4 °C and 11.8-32.5 ppt, respectively. The discovery of the larval stage suggests that adults of this species may be reproducing in the eastern coastal zone of Uruguay or nearby regions. The area in which they are currently found could potentially serve as a biological corridor, facilitating their spread to other estuaries of great economic and ecological importance, such as the Río de la Plata, as well as other coastal lagoons and subestuaries in Uruguay and Argentina. Further monitoring studies are necessary to determine whether this species became established in the area. Potential ecological consequences in our region derived from its presence are herein discussed. Abstract Brachyura, Brachyura (Brachyura Panopeidae Atlantic However habitat shipping location currents 1982 America Patos Brazil R Rocha 30 1 samplings 201 2017 Notably April. April . April) 18 10 m3 m 224 22 4 22. C 11.832.5 118325 11.8 32.5 11 8 32 5 11.8-32. ppt respectively corridor importance Plata Argentina discussed 198 3 20 2 832 11.832. 11832 118 11. 325 32. 11.8-32 83 11.832 1183 11.8-3 11.83 11.8-

https://doi.org/10.1590/2675-2824072.23084

Growth and carbon turnover of Piaractus mesopotamicus Holmberg, 1887 (Osteicthyes: Characidae): contribution of extruded feed and natural food Holmberg 188 Osteicthyes (Osteicthyes Characidae Characidae) 18 1
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AGUILAR, FREDY ARMANDO A.

; BARONE, RAFAEL S.C.

; MOURÃO, GERSON B.

; MARTINELLI, LUIZ ANTONIO

; CYRINO, JOSÉ EURICO P.

Anais da Academia Brasileira de Ciências

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2024, Volumen 96 Nº 1 elocation e20220805

Resumen: En | Texto: En | PDF: En

Abstract Piaractus mesopotamicus, is a fish usually farmed in semi-intensive systems with access to natural food and supplementary feed. This study evaluates effects of feed allowance on the productive performance, carbon turnover and proportions of nutrient (carbon) contribution of feed and natural food for the growth of pacu. Juvenile fish were stocked in fiberglass tanks and fed to 100, 75, 50, 25, 0% apparent satiety (ApS), with a practical, extruded (C4 photosynthetic pathway) feed in a randomized design trial (n=3); plankton production for simulated semi-intensive farming system condition was induced by chemical fertilization. A control treatment was set up in tanks devoid of natural food. Data on muscle stable carbon isotope ratios were used to study carbon turnover using a relative growth-based model. Low variation of the δ13C impaired fitting a turnover model curve for the 0 and 25 % ApS treatments. Fish of the 100% and 75% ApS treatments reached circa 95% and 82.85% of the carbon turnover, respectively. Extruded feed was the main nutrient source for the growth of pacu in the semi-intensive, simulated farming condition. The current study contributes to the knowledge of the relationship between feeding rates and carbon turnover rates in the pacu muscle. mesopotamicus semiintensive semi intensive performance (carbon 100 75 50 ApS, , (ApS) practical C4 C (C pathway n=3 n3 n 3 (n=3) fertilization growthbased based δC δ 2 95 8285 82 85 82.85 respectively semiintensive, intensive, 10 7 5 (ApS n= (n=3 9 828 8 82.8 1 (n= 82. (n

https://doi.org/10.1590/0001-3765202420220805

Population dynamics of pelagic rotifers in Marala Headworks (Pakistan)
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Tufail, Shahzad

; Liaqat, Iram

; Saleem, Sadiah

; Bibi, Asia

; Mubin, Muhammad

; Nisar, Bushra

Brazilian Journal of Biology

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2024, Volumen 84 elocation e250134

Resumen: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Resumo O trabalho de pesquisa foi projetado para investigar a densidade e diversidade de rotíferos pelágicos em um lago perto de Marala Headworks. Foram avaliados os parâmetros físico-químicos da água como pH, oxigênio dissolvido, temperatura, condutividade elétrica, transparência e turbidez. A correlação entre rotíferos e esses parâmetros também foi estudada. A amostragem do plâncton foi realizada mensalmente para verificar a densidade populacional dos rotíferos. No total, foram identificadas 18 espécies de rotíferos pertencentes a 11 gêneros. O maior número de rotíferos e sua diversidade foi demonstrado pelos gêneros Brachionus, Keratella e Filinia. O Brachionus calyciflorus foi a espécie dominante em todas as amostras, com densidade populacional média (41%). A análise de variância dos parâmetros físico-químicos mostrou que a temperatura do ar e da água, condutividade elétrica, transparência, oxigênio dissolvido e saturação de oxigênio foram estatisticamente significantes em todos os meses. Enquanto o pH foi estatisticamente não significativo (p≥0,05), a correlação de Pearson mostrou que o oxigênio e a transparência foram negativamente correlacionados com a densidade e diversidade dos rotíferos. A temperatura do ar e da água, a concentração de íons de hidrogênio (pH), a condutividade elétrica e a salinidade mostraram relação positiva com a densidade e diversidade de rotíferos.

Abstract Research work was designed to investigate the density and diversity of pelagic rotifers in a Lake near Marala Headworks. The physico-chemical parameters of water such as pH, dissolved oxygen, temperature, electrical conductivity, transparency and turbidity were evaluated. Correlation between rotifers and these parameters was also studied. Plankton sampling was done on monthly basis in order to check the population density of rotifers. In total, 18 species of rotifers were identified which belonged to 11 genera. The highest number of rotifers and their diversity was shown by genera namely Brachionus, Keratella, and Filinia. The Brachionus calyciflorus was dominant species in all the samples with mean population density (41%). Analysis of variance of physico-chemical parameters presented that the air and water temperature, electrical conductivity, transparency, dissolved oxygen and oxygen saturation were statistically significant in all the months. While pH was statistically non-significant (p≥0.05. Pearson correlation showed that oxygen and transparency were negatively correlated with rotifers density and diversity. Air and water temperature, concentration of hydrogen ions (pH), electrical conductivity and salinity showed positive relationship with density and diversity of rotifers.

https://doi.org/10.1590/1519-6984.250134

Shallow reservoirs in urban perimeter: evaluation of trophic status and relations with the zooplanktonic community perimeter
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Martins, Heytor Lemos

; Panarelli, Eliana Aparecida

; Borges, Jaqueline Souza

; Korasaki, Vanesca

; Millan, Rodrigo Ney

Acta Limnologica Brasiliensia

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2024, Volumen 36 elocation e15

Resumen: En Pt | Texto: En Pt | PDF: En | PDF: Pt

Abstract: Aim The zooplankton community is used as a bioindicator of environmental changes and can be an indicator of trophic status in aquatic environments through changes in the composition of the community. The objective of this work was to study the variation of shallow reservoir systems in an urban park, evaluating the relationships between physical, chemical, and biological variables. Methods The collections were conducted monthly for a year in the surface of reservoirs. The physical and chemical variables of the water were measured using a multiparametric probe on the surface. Nutrient analysis was performed using spectrophotometry in the laboratory. Zooplankton was collected using a plankton net (60 µm mesh size). Principal Coordinate Analysis (PCoA) was used to verify whether the three reservoirs present differences in zooplankton community composition. Results Altogether, 43 taxa belonging to 16 families were collected. Rotifera was the most representative group, with 27 taxa, Cladocera had 13 taxa, and Copepoda had only three taxa. The environmental variables indicated different trophic status between the reservoirs, demonstrating greater eutrophication in reservoirs 1 and 3. An association between the composition of the zooplankton community and the trophic state of the reservoirs was verified. Conclusions The composition of the zooplankton community shows differences among three of the shallow urban reservoirs studied. Reservoir 1 exhibited Filinia terminalis and Asplanchna herrick as indicator species. As for reservoir 2, with a lower trophic status, the indicative species were Bosmina freyi and Diaphanosoma polyspina, correlated with lower concentrations of nitrate, nitrite, total phosphorus, pH, and lower values of electrical conductivity. Reservoir 3 exhibited Brachionus angularis and Brachionus calyciflorus as indicator species, demonstrating a similar nutrient profile to R1, but with higher nitrate concentrations. Abstract park laboratory 60 (6 size. size . size) PCoA (PCoA Altogether 4 group 2 verified studied polyspina nitrite phosphorus pH conductivity R1 R 6 (

Resumo: Objetivo A comunidade zooplâncton é utilizada como bioindicador de mudanças ambientais e pode ser um indicador do estado trófico em ambientes aquáticos através de mudanças na composição da comunidade. O objetivo deste trabalho foi estudar a variação de sistemas de reservatórios rasos em um parque urbano, avaliando as relações entre variáveis físicas, químicas e biológicas. Métodos As coletas foram realizadas mensalmente durante um ano na superfície dos reservatórios. As variáveis físicas e químicas da água foram medidas por meio de sonda multiparamétrica na superfície. A análise dos nutrientes foi realizada por espectrofotometria em laboratório. O zooplâncton foi coletado com rede de plâncton (malha de 60 µm). A Análise de Coordenadas Principais (PCoA) foi utilizada para verificar se os três reservatórios apresentam diferenças na composição da comunidade zooplanctônica. Resultados Ao todo foram coletados 43 táxons pertencentes a 16 famílias. Rotifera foi o grupo mais representativo, com 27 táxons, Cladocera teve 13 táxons e Copepoda teve apenas três táxons. As variáveis ambientais indicaram diferentes estados tróficos entre os reservatórios, demonstrando maior eutrofização nos reservatórios 1 e 3. Foi verificada associação entre a composição da comunidade zooplanctônica e o estado trófico dos reservatórios. Conclusões A composição da comunidade zooplanctônica apresenta diferenças entre três dos reservatórios urbanos rasos estudados. O reservatório 1 exibiu Filinia terminalis e Asplanchna herrick como espécies indicadoras. Já no reservatório 2, com menor status trófico, as espécies indicativas foram Bosmina freyi e Diaphanosoma polyspina, correlacionadas com menores concentrações de nitrato, nitrito, fósforo total, pH e menores valores de condutividade elétrica. O reservatório 3 exibiu Brachionus angularis e Brachionus calyciflorus como espécies indicadoras, demonstrando perfil nutricional semelhante ao R1, mas com maiores concentrações de nitrato. Resumo urbano biológicas laboratório malha 6 µm. µm . µm) PCoA (PCoA 4 famílias representativo 2 estudados indicadoras polyspina nitrato nitrito total elétrica R1 R

https://doi.org/10.1590/s2179-975x8322

Planktonic cyanobacteria from urban lakes in Manaus (Amazonas - Brazil) Amazonas Brazil
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Melo, Sérgio

; Ribeiro, Lincoln de Brito

; Pereira, Andreia Cavalcante

; Werner, Vera Regina

Rodriguésia

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2024, Volumen 75 elocation e00182023

Resumen: En Pt | Texto: En Pt | PDF: En | PDF: Pt

Abstract The aim of this research was to study the diversity of planktonic cyanobacteria in three urban lakes in Manaus, in the state of Amazon, by analyzing samples collected monthly with a plankton net from October 2009 to September 2010 (except March 2010). Twelve species were identified and classified. Anathece cf. minutissima, Aphanocapsa annulata, Ap. stagnalis, Coelomoron microcystoides and Pseudanabaena mucicola were recorded for the first time in the Brazilian Amazon region. Potentially toxic cyanobacteria blooms occurred in all three lakes, especially in Ceasa and Japiim, where Microcystis aeruginosa and Planktothrix agardhii, respectively, were the predominant species in all analyzed samples. Descriptions and illustrations of the identified species are presented as well as comments. In addition, environmental variables were presented (electrical conductivity, pH and water temperature). The waters of the studied environments ranged from slightly acid to alkaline and temperature varied from 23.2 to 30.5 °C. Manaus 200 201 except 2010. . 2010) classified cf minutissima annulata Ap stagnalis region Japiim agardhii respectively comments addition electrical conductivity temperature. temperature) 232 23 2 23. 305 30 5 30. C °C 20 3

Resumo O trabalho teve como objetivo conhecer a diversidade de cianobactérias planctônicas de três lagos urbanos de Manaus, no estado do Amazonas, a partir da análise de amostras coletadas com rede de plâncton, mensalmente, de outubro de 2009 a setembro de 2010, excetuando-se março de 2010. Foram identificadas 12 espécies, dentre estas, Anathece cf. minutissima, Aphanocapsa annulata, Ap. stagnalis, Coelomoron microcystoides e Pseudanabaena mucicola foram registradas pela primeira vez na Amazônia brasileira. Florações de cianobactérias potencialmente tóxicas ocorreram nos três lagos, destacando-se os lagos Ceasa e Japiim onde Microcystis aeruginosa e Planktothrix agardhii foram, respectivamente, as espécies predominantes em todas as amostras analisadas. São apresentadas descrições e ilustrações das espécies identificadas, bem como comentários taxonômicos. Adicionalmente, as variáveis ambientais (condutividade elétrica, pH e temperatura da água) foram apresentadas. As águas dos ambientes estudados oscilaram de levemente ácidas a alcalinas com valores de temperatura variando de 23,2 a 30,5 °C. Manaus Amazonas plâncton mensalmente 200 2010 excetuandose excetuando se 1 estas cf minutissima annulata Ap stagnalis brasileira destacandose destacando respectivamente analisadas taxonômicos Adicionalmente condutividade elétrica água 232 23 2 23, 305 30 5 30, C °C 20 201 3

https://doi.org/10.1590/2175-7860202475021

Factors stimulating the hatching of resting eggs and their contribution to the composition of cladoceran assemblages in tropical temporary lagoons
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Guimarães, Wesley Luiz

; Panarelli, Eliana Aparecida

; Santos, Natan Guilherme dos

; Castilho-Noll, Maria Stela Maioli

Acta Limnologica Brasiliensia

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2024, Volumen 36 elocation e28

Resumen: En Pt | Texto: En Pt | PDF: En | PDF: Pt

Abstract: Aim We aimed to verify the contribution of cladocerans’ resting eggs to the active communities of temporary lagoons and, through an experiment, identify which conditions induce high hatching rates. Methods Cladocera assemblages were sampled in four temporary lagoons in the Turvo River floodplain (20° 22’S and 49° 16’W), in the northwest region of São Paulo State, Brazil. Sediment samples were taken during the dry season from a depth of 5 cm, using a 4.5 cm diameter corer. Plankton samples were taken from the water column before and after the dry season. For the hatching test, two treatments were performed 1. Natural condition – without light and temperature control; 2. Controlled condition – with controlled photoperiod and temperature. Temperature, pH, conductivity, dissolved oxygen and hatching of resting eggs were monitored for two weeks. The influence of the parameters on hatching in both treatments was evaluated using Hierarchical Partition Analysis. Results Hatching of resting eggs was higher in the Controlled condition than in the Natural one. Thirty percent of species observed in the active community after flooding hatched in the laboratory test. Conductivity, pH, and dissolved oxygen were positively correlated to the hatching of some species, e.g., Ephemeroporus hybridus, Leydigiops ornata, Notoalona sculpta and Ilyocryptus spinifer. The first species to hatch were those living associated with macrophytes and at low depths. Conclusions Our results show that stable temperature and photoperiod with similar light and dark hours stimulate greater hatching of Cladocera resting eggs. Variables such as pH, conductivity and dissolved oxygen were also correlated with the hatching of some species. We observed that the first contributions to activating the community after drought came from hatching of species usually associated with macrophytes and low depth conditions. Abstract cladocerans experiment rates 20° 20 (20 22S S 22 49 16W, 16W W 16 , 16’W) State Brazil 45 4 4. corer test 1 control 2 Temperature pH weeks Analysis one Conductivity eg e g e.g. hybridus ornata spinifer depths (2 16’W e.g (

Resumo: Objetivo Este estudo tem como objetivo verificar a contribuição dos ovos de resistência de cladóceros para as comunidades ativas de lagoas temporárias e testar experimentalmente as condições específicas para a eclosão destes ovos de resistência. Métodos Amostras de cladóceros foram obtidas em quatro lagoas temporárias na planície de inundação do rio Turvo (20° 22’S e 49° 16’W), na região noroeste do Estado de São Paulo, Brasil. Amostras de 5 cm de sedimento foram coletadas durante a estação seca, usando um corer de 4,5 cm de diâmetro. Amostras de plâncton foram coletadas antes e depois da estação seca. Para o teste de incubação, foram realizados dois tratamentos a saber, 1. Condições naturais - sem controle de luz e temperatura; 2. Condições controladas - com fotoperíodo e temperatura controlados. A condição da água e a eclosão dos ovos de resistência foram monitoradas por duas semanas. A influência dos parâmetros na eclosão em ambos os tratamentos foi avaliada por meio da Análise de Partição Hierárquica. Resultados A eclosão dos ovos de resistência foi maior no tratamento Condições controladas do que Condições naturais. Trinta por cento das espécies observadas na comunidade ativa após o alagamento eclodiram no teste de laboratório. Condutividade, pH e oxigênio dissolvido foram positivamente correlacionados com a eclosão de algumas espécies como Ephemeroporus hybridus, Leydigiops ornata, Notoalona sculpta e Ilyocryptus spinifer. As primeiras espécies a eclodirem foram aquelas associadas a macrófitas e em ambients com baixas profundidades. Conclusões Nossos resultados mostram que condições constantes de temperatura e fotoperíodo estimulam maior taxa de eclosão dos ovos de resistência de Cladocera. Variáveis como pH, condutividade e oxigênio dissolvido também foram correlacionados com a eclosão de algumas espécies estudadas. Observamos que as primeiras contribuições para a comunidade ativa após a seca vieram da eclosão de espécies geralmente associadas a macrófitas e condições de baixa profundidade. Resumo 20° 20 (20 22S S 22 49 16W, 16W W 16 , 16’W) Paulo Brasil 45 4 4, diâmetro incubação saber 1 2 controlados semanas Hierárquica laboratório Condutividade hybridus ornata spinifer profundidades Cladocera estudadas profundidade (2 16’W (

https://doi.org/10.1590/s2179-975x4221

Effect of natural food consumption on the first phase of pirarucu grow-out in ponds and cages growout grow out
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OLIVEIRA, Hyago Jovane Borges de

; LIMA, Adriana Ferreira

; LAPA, Lorhane Caroline Ferreira da

; OLIVEIRA, Hygo Jovane Borges de

; MATOS, Flávia Tavares de

; NUÑER, Alex Pires de Oliveira

Acta Amazonica

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Mar 2023, Volumen 53 Nº 1 Paginas 32 - 41

Resumen: En Pt | Texto: En Pt | PDF: En | PDF: Pt

ABSTRACT Pirarucu, Arapaima gigas is a fish species of great social and economic importance in the Amazon region, where they are often farmed in earthen ponds. Intensive cage aquaculture has been growing in Brazil, which could be an alternative means to farm pirarucu, reducing costs and increasing productivity. We evaluated the contribution of natural food organisms in semi-intensive (ponds) and intensive (cages) production systems, and their effect on pirarucu growth and economic performance during the first phase of grow-out. Four ponds (300 m2) and four cages (4.0 m³) were stocked, respectively, with 120 (0.4 fish m-²) and 160 (40 fish m-³) juvenile pirarucu (28.03 ± 6.34 g, 11.75 ± 0.80 cm). The study was conducted for 105 days and fish were fed with commercial feed. Fish growth and plankton intake were evaluated every two weeks. Survival rate, standard length, weight gain and final weight were higher in fish reared in earthen ponds than in cages. Feed conversion of fish kept in ponds was lower (0.96 ± 0.06) than in cages (1.20 ± 0.11). The consumption of natural food organisms was observed, despite artificial feed being fed in both systems. The relative abundance of zooplankton and insects in stomachs was directly proportional to fish weight gain in ponds, and inversely proportional in cages. Higher economic efficiency rate and lower average production cost were calculated for earthen ponds. Our results indicate that the cost-benefit of the first phase grow-out of A. gigas is better in earthen ponds. Pirarucu region Brazil productivity semiintensive semi (ponds (cages systems growout. growout grow out. out 300 (30 m2 m 4.0 40 4 0 (4. m³ stocked respectively 12 0.4 04 (0. m² ² m-² 16 (4 ³ m-³ 28.03 2803 28 03 (28.0 634 6 34 6.3 g 1175 11 75 11.7 080 80 0.8 cm. cm . cm) 10 weeks length 0.96 096 96 (0.9 0.06 006 06 1.20 1 20 (1.2 0.11. 011 0.11 0.11) observed costbenefit benefit A 30 (3 4. 0. (0 m- ( 28.0 280 2 (28. 63 3 6. 117 7 11. 08 8 0.9 09 9 0.0 00 1.2 (1. 01 0.1 28. (28 1. (1 (2

RESUMO O pirarucu, Arapaima gigas é um peixe de grande importância econômica e social na Amazônia, onde é comumente produzido em viveiros. A produção de peixes em tanques-rede tem crescido no Brasil, e este sistema poderia ser uma alternativa para a produção do pirarucu, reduzindo custos e melhorando os parâmetros produtivos. Nós avaliamos a contribuição do alimento natural na produção em sistema semi-intensivo (viveiros) e intensivo (tanques-rede) e seus efeitos sobre os aspectos produtivos e econômicos do pirarucu na fase de recria. Quatro viveiros (300 m2) e quatro tanques-rede (4,0 m3) foram estocados, respectivamente, com 120 (0,4 peixes m-2) e 160 (40 peixes m-3) juvenis de pirarucu (28,03 ± 6,34 g e 11,75 ± 0,80 cm). O estudo foi conduzido por 105 dias e os peixes foram alimentados com ração comercial extrusada. Crescimento e ingestão de plâncton pelos peixes foram avaliados quinzenalmente. Sobrevivência, comprimento padrão, ganho de peso e peso final foram maiores nos peixes cultivados em viveiros. A conversão alimentar nos viveiros (0,96 ± 0,06) foi menor que nos tanques-rede (1,20 ± 0,11). Mesmo sendo ofertada ração, os pirarucus consumiram alimento natural nos dois sistemas de produção. A abundância relativa de zooplâncton e insetos nos estômagos foi diretamente proporcional ao ganho de peso nos viveiros, e inversamente proporcional nos tanques-rede. Um índice de eficiência econômica mais alto e custo médio de produção mais baixo foram calculados para os viveiros escavados. Nossos resultados indicam que o custo-benefício do cultivo de A. gigas durante a fase de recria é melhor em viveiros. Amazônia tanquesrede tanques rede Brasil semiintensivo semi (viveiros (tanques-rede 300 (30 m2 m 4,0 40 4 0 (4, m3 estocados respectivamente 12 0,4 04 (0, 2 m-2 16 (4 3 m-3 28,03 2803 28 03 (28,0 634 6 34 6,3 1175 11 75 11,7 080 80 0,8 cm. cm . cm) 10 extrusada quinzenalmente Sobrevivência padrão 0,96 096 96 (0,9 0,06 006 06 1,20 1 20 (1,2 0,11. 011 0,11 0,11) tanquesrede. rede. escavados custobenefício benefício 30 (3 4, 0, (0 m- ( 28,0 280 (28, 63 6, 117 7 11, 08 8 0,9 09 9 0,0 00 1,2 (1, 01 0,1 28, (28 1, (1 (2

https://doi.org/10.1590/1809-4392202201041

Temporal patterns of picoplankton abundance and metabolism on the western coast of the equatorial Atlantic Ocean
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Menezes, Maiara

; Junger, Pedro C.

; Kavagutti, Vinicius S.

; Wanderley, Bruno

; Cabral, Anderson de Souza

; Paranhos, Rodolfo

; Unrein, Fernando

; Amado, André M.

; Sarmento, Hugo

Ocean and Coastal Research

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2023, Volumen 71 Supl. 2 elocation e23019

Resumen: En | Texto: En | PDF: En

Abstract Picoplankton are central global carbon (C) cycling players and often dominate the ocean plankton communities, especially in low latitudes. Therefore, evaluating picoplankton temporal dynamics is critical to understanding microbial stocks and C fluxes in tropical oceans. However, the lack of studies on low-latitude picoplankton communities translates into a common conception that there is an absence of seasonality. Herein, we studied the temporal variation in abundance (measured by flow cytometry), and carbon flux (taking bacterial production and respiration as proxies) of the picoplanktonic community for the first time, as well as their environmental drivers in a low-latitude (05° 59’ 20.7″S 035° 05’ 14.6″W) Atlantic coastal station. We performed monthly samplings between February 2013 and August 2016 in a novel microbial observatory – hereafter called the Equatorial Atlantic Microbial Observatory – established on the northeastern Brazilian Atlantic coast. Our results revealed stability in temporal dynamics of picoplankton, despite a considerable inter-annual variation, with some related to the El Niño (ENSO) event in 2015. However, weak environmental relationships found were not enough to explain the variation in picoplankton’s abundance, which suggests that other factors such as biological interactions may lead to picoplankton abundance variation over time. Heterotrophic bacteria dominated picoplankton during the entire study period and between photosynthetic counterparts, and Synechococcus showed greater relative importance than picoeukaryotes. These results bring a novel perspective that picoplankton may exhibit more pronounced fluctuations in the tropical region when considering inter-annual intervals, and is increasing prokaryotic contribution to carbon cycling towards the equator. (C latitudes Therefore oceans However lowlatitude latitude seasonality Herein measured cytometry, cytometry , cytometry) taking proxies time 05° 05 (05 59 207S S 20 7 035 14.6″W 146W W 14 6 station 201 coast interannual inter annual ENSO (ENSO 2015 picoplanktons s counterparts picoeukaryotes intervals equator 0 (0 5 2 03 1 (

https://doi.org/10.1590/2675-2824071.22048mm

10.

Diel feeding activity of Abudefduf saxatilis (Perciformes: Pomacentridae) on southwestern Atlantic reefs Perciformes (Perciformes Pomacentridae
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Nunes, Lucas T.

; Leão, Caroline C.

; Floyd, Alexander A.

; Sazima, Ivan

; Ferreira, Carlos E. L.

; Floeter, Sergio R.

Neotropical Ichthyology

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2023, Volumen 21 Nº 3 elocation e220119

Resumen: En Pt | Texto: En Pt | PDF: En | PDF: Pt

Abstract Feeding ecology studies are crucial for understanding energy flow in reef ecosystems. In this study, we used an integrative approach to investigate the diel-feeding ecology of the sergeant-major Abudefduf saxatilis. To examine the possibility of diel-periodicity and size-class differences in foraging behaviour, we tracked fish individuals until their first bite on two subtropical reefs. During each observation, we recorded the substratum that was bitten and estimated the individual’s total length. To assess the diet, we analysed the stomach contents of five individuals from each location. In total, we observed 2,703 individuals biting seven substrates. Our results showed no significant differences in substrate use for diel-periodicity. However, we found significant differences between two size classes. Despite this, both populations tended to forage near the surface in the water column in the morning and on the benthos in the afternoon, although this tendency was not statistically significant. Smaller individuals fed mostly in the water column, while larger individuals foraged on all substrates, likely due to their different energetic demands. Our findings indicate this species has an omnivorous, generalist diet, comprising 12 items from both benthos and plankton. The lack of differences in diel-periodicity is likely due to the sergeant-major’s opportunistic behaviour. ecosystems study dielfeeding diel feeding sergeantmajor sergeant major saxatilis dielperiodicity periodicity sizeclass class behaviour reefs observation individual s length diet location 2703 2 703 2,70 substrates dielperiodicity. periodicity. However classes afternoon demands omnivorous 1 plankton sergeantmajors 270 70 2,7 27 7 2,

Resumo Estudos de ecologia alimentar são cruciais para entender o fluxo de energia em ecossistemas recifais. Neste estudo, usamos uma abordagem integrativa para investigar a ecologia alimentar do sargentinho Abudefduf saxatilis. Para responder se há periodicidade ou diferenças relacionadas a classes de tamanho no substrato forrageado, acompanhamos indivíduos deste peixe até a primeira mordida, em dois recifes subtropicais. Durante cada observação, registramos o substrato mordido e estimamos o comprimento total do indivíduo. Para estudar a sua dieta, analisamos o conteúdo estomacal de cinco indivíduos em cada recife. No total, observamos 2.703 indivíduos mordendo em sete substratos diferentes. Nossos resultados não mostraram diferenças significativas no uso de substrato para a periodicidade diária. No entanto, encontramos diferenças significativas entre duas classes de tamanho. Apesar disso, ambas as populações tenderam a forragear próximo à superfície na coluna d’água pela manhã e no substrato bentônico à tarde, embora essa tendência não tenha sido estatisticamente significativa. Indivíduos menores forragearam principalmente na coluna d’água, enquanto os indivíduos maiores forragearam em todos os tipos de substratos, provavelmente devido às suas diferentes demandas energéticas. Nossos resultados corroboram que o sargentinho tem uma dieta onívora e generalista, composta por 12 itens de ambos os compartimentos, bentônico e planctônico. A falta de diferenças na periodicidade diária é provavelmente devido ao comportamento oportunista do sargentinho. recifais estudo saxatilis forrageado mordida subtropicais observação indivíduo recife 2703 2 703 2.70 entanto disso dágua d água tarde significativa dágua, água, energéticas generalista 1 compartimentos planctônico 270 70 2.7 27 7 2.

https://doi.org/10.1590/1982-0224-2022-0119

11.

Multidisciplinary Scientific Cruises for Environmental Characterization in the Santos Basin – Methods and Sampling Design
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Moreira, Daniel L.

; Dalto, Adriana G.

; Figueiredo JR, Alberto G.

; Valerio, Aline M.

; Detoni, Amalia M. S.

; Bonecker, Ana C. T.

; Signori, Camila N.

; Namiki, Cláudia

; Sasaki, Dalton K.

; Pupo, Daniel V.

; Silva, Danilo A.

; Kutner, Deborah S.

; Duque-Castaño, Diana C.

; Marcon, Eduardo H.

; Gallotta, Fabiana D. C.

; Paula, Fabiana S.

; Gallucci, Fabiane

; Roque, Gabriela C. F.

; Campos, Giulia S.

; Fonseca, Gustavo

; Mattos, Gustavo

; Lavrado, Helena P.

; Silveira, Ilson C. A. da

; Costa, Jessica O.

; Santos Filho, João R. dos

; Carneiro, Juliane C.

; Moreira, Julio C.F.

; Rozo, Laura

; Araujo, Leandro F.M.

; Lazzari, Letícia

; Silva, Letícia O. da

; Michelazzo, Luan S.

; Fernandes, Luciano F.

; Dottori, Marcelo

; Araújo Jr., Marcus A. G. de

; Chuqui, Mateus G.

; Ceccopieri, Milena

; Borges-Silva, Milton

; Kampel, Milton

; Bergo, Natascha M.

; Silva, Paulo V. M.

; Tura, Pedro M.

; Moura, Rafael B. de

; Romano, Renato G.

; Martins, Renato P.

; Carreira, Renato S.

; Toledo, Rodrigo G.A.

; Bonecker, Sérgio L.C.

; Disaró, Sibelle T.

; Rodrigues, Silvana V.

; Corbisier, Thais N.

; Vicente, Thaisa M.

; Paiva, Vitor G. de

; Pellizari, Vivian H.

; Belo, Wellington C.

; Brandini, Frederico P.

; Sousa, Silvia H.M

Ocean and Coastal Research

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2023, Volumen 71 Supl. 3 elocation e23022

Resumen: En | Texto: En | PDF: En

Abstract The Santos Basin (SB) is the main petroliferous basin in the Brazilian continental margin and one of the most studied marine areas in Brazil. However, historical data suggest that new efforts should be carried out to acquire quantitative biological data, especially in the deep sea, to establish the baseline of essential ocean variables in different ecosystems for future monitoring programs. The Brazilian energy company Petrobras planned and executed 24 oceanographic cruises over a period of 2 years to assess the benthic (SANSED cruise) and pelagic (SANAGU cruise) systems of the SB (356 days at sea in 2019 and 2021/2022). These efforts were part of the Santos Project, which comprised a comprehensive environmental study aimed at investigating benthic and pelagic variables to characterize ecology, biogeochemistry, thermohaline properties of water masses, and ocean circulation patterns, geomorphology, and sedimentology, as well as organic and inorganic chemistry. Here we present the detailed sampling designs and the field methods employed on board, during the SB scientific cruises. All sampling protocols were based on standardized approaches. For the benthos analyses, triplicate sediment samples were performed using a GOMEX-type box corer (0.25 m²) or a large modified Van Veen grab (0.75 m²) at 100 stations ranging from 25 to 2400 m depth. At each station, 25 geochemical and physico-chemical parameters were analyzed in addition to micro-, meio-, and macrofauna and living foraminifera samples. For the pelagic system, 60 stations were selected to investigate the plankton community, ranging in size from pico- to macroplankton, through vertical, horizontal, and oblique net hauls (20, 200, and 500 μm mesh size), as well as 25 biogeochemical parameters collected with an aid of a CTD-rosette sampler. Part of this scientific information also serves the Regional Environmental Characterization Project (PCR-BS) in support of Petrobras’ Santos Basin drilling licensing process led by the Brazilian Environmental Agency – IBAMA. This project contributes to the sustainable development of the SB, in line with the guidelines of the United Nations Decade of Ocean Science for Sustainable Development. (SB Brazil However programs SANSED cruise SANAGU 356 (35 201 2021/2022. 20212022 2021/2022 . 2021 2022 2021/2022) ecology biogeochemistry masses patterns geomorphology sedimentology chemistry board approaches analyses GOMEXtype GOMEX type 0.25 025 0 (0.2 m² 0.75 075 75 (0.7 10 240 depth station physicochemical physico chemical micro, micro , micro- meio, meio meio- system 6 community pico macroplankton vertical horizontal 20, 20 (20 200 50 size, size) CTDrosette CTD rosette sampler PCRBS PCR BS (PCR-BS IBAMA Development 35 (3 2021202 2021/202 202 0.2 02 (0. 0.7 07 7 1 (2 5 3 ( 202120 2021/20 0. (0 20212 2021/2 2021/

https://doi.org/10.1590/2675-2824071.22072dlm

12.

Specific alkaline phosphatase activity as an indicator of phosphorus status in the plankton community of a highly stratified oligotrophic Ombla Estuary
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Hrustić, Enis

; Ljubimir, Stijepo

; Bobanović-Ćolić, Svjetlana

; Ivančić, Ingrid

Ocean and Coastal Research

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2023, Volumen 71 elocation e23044

Resumen: En | Texto: En | PDF: En

Abstract We evaluated the seasonal phosphorus (P) status of the plankton community in the Ombla Estuary (OE) by using its specific alkaline phosphatase activity (sAPA). Microphytoplankton (MICRO) indicated a substantially higher P deficiency than nanophytoplankton (NANO) and picoplankton (PICO). We found that the prolonged increase in the temperature of the surface estuarine water supported a notable growth of the dinoflagellate Prorocentrum spp. in late spring-early summer (June). In the summer (August), we found the maximum microphytoplankton sAPA (MICRO sAPA) (307.8 nmol μg C-1 h-1) in the surface water, in which (84%) dinoflagellates predominated within MICRO with the maximum alkaline phosphatase activity (APA) in all size fractions, including free enzymes. Persistently low discharge of Ombla during summer-early autumn caused a transition from phosphorus- to potentially nitrogen-limited MICRO in the surface water in early autumn (October). Nutrient stress disappeared in winter, in which a significant amount of dissolved orthosilicate, dissolved inorganic nitrogen (DIN), and soluble reactive phosphorus (SRP) enriched the estuary via maximal river discharge and inflow of nutrient-rich coastal waters. MICRO (coccolithophorids and diatoms) had very low APA (surface water) and quantitatively undetectable APA (bottom water) in the nutrient-rich water column in January. This study shows a more significant impact of nutrient concentrations on MICRO than other size classes of the plankton community. Because of the similarity in seasonal hydrological features, we assume that the general pattern of switching from P- to N-limitation of phytoplankton growth also occurs in other highly stratified estuaries along the coastal karst of the eastern Adriatic Sea during the lowest river discharges and groundwater activities in summer-early autumn before the rainy season. This study indicates that a common highly stratified estuary on the eastern Adriatic coast can serve as a natural laboratory to explore connections between nutrient limitations and phytoplankton successions. (P OE (OE sAPA. . (sAPA) NANO (NANO PICO. PICO (PICO) spp springearly spring June. June (June) August, August , (August) 307.8 3078 307 8 (307. C1 C 1 C- h1 h h-1 84% 84 (84% (APA fractions enzymes summerearly nitrogenlimited limited October. October (October) winter orthosilicate DIN, DIN (DIN) SRP (SRP nutrientrich rich waters coccolithophorids diatoms bottom January features Nlimitation N limitation season successions (sAPA (PICO (June (August 307. 30 (307 h- (84 (October (DIN 3 (30 (8 (3 (

https://doi.org/10.1590/2675-2824071.22094eh

13.

Towards a distributed and operational pelagic imaging network
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Kiko, Rainer

; Lopes, Rubens M.

; Soviadan, Y. Dodji

; Stemmann, Lars

Ocean and Coastal Research

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2023, Volumen 71 elocation e23058

Resumen: En | Texto: En | PDF: En

Abstract Dimensions of particulate matter found in the water column of marine and freshwater environments (the pelagic realm) range from nanometers to tens of meters. Included in this enormous size range are miniature bacteria, phytoplankton (photosynthetic microalgae), mixoplankton (mixotrophic microorganisms), micro- to meter sized drifting animals (zooplankton), plastic particles, detrital aggregates and fecal pellets, fish, whales and many others. These particles and organisms are involved in many different processes and perform a multitude of services, such as in oceanic biogeochemistry (carbon fixation, oxygen production, carbon export and others) or human nourishment (fisheries). Digital optical tools used in pelagic imaging approaches now allow to bridge this enormous size span and to image micro- to meter-sized objects in situ or on discrete samples. Monitoring plankton, nekton, and particle dynamics at spatial and temporal scales that enable effective management of marine and freshwater environments poses a collective challenge for society. We here argue that a global, distributed and operational network for pelagic imaging is needed and within reach, and we provide recommendations how it can be attained via the voluntary activities of the pelagic imaging community and strategic support from funding agencies and other stakeholders. realm meters bacteria photosynthetic microalgae, microalgae , microalgae) mixotrophic microorganisms, microorganisms microorganisms) micro zooplankton, zooplankton (zooplankton) pellets fish others services fixation production fisheries. fisheries . (fisheries) metersized samples plankton nekton society global reach stakeholders (zooplankton (fisheries

https://doi.org/10.1590/2675-2824071.23109rk

14.

Diversity of planktonic gastropods from western Baja California Peninsula assessed by 18S rDNA sequences
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Pérez-Enríquez, Ricardo

; Arciniega, Alejandra

; Díaz-Viloria, Noé

; Lluch-Cota, Salvador E.

Revista mexicana de biodiversidad

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2023, Volumen 94 elocation e944968

Resumen: Es En | Texto: Es En | PDF: Es | PDF: En

Resumen El estudio de moluscos planctónicos es un elemento relevante para la comprensión de la dinámica de la comunidad bentónica bajo las condiciones ambientales actuales y futuras. Se presenta la descripción de la biodiversidad de gasterópodos planctónicos en 2 sitios de la costa del Pacífico de la península de Baja California, México. Organismos recolectados en arrastres planctónicos en 2 localidades (Cabo Tosco, n = 89 y La Bocana, n = 213) se secuenciaron para una fracción del gen 18S ADNr. Se registró una alta diversidad con 71 unidades taxonómicas moleculares operativas (MOTU), que contrasta con la baja diversidad fenotípica observada en imágenes de estereoscopio. Las diferencias en la composición de la comunidad entre y dentro de los sitios de muestreo, indican que la distribución de gasterópodos planctónicos no es aleatoria, sino que se encuentra, probablemente, modulada por procesos microambientales tales como corrientes o eventos biológicos. La presencia de secuencias de organismos que no son gasterópodos dentro de algunas conchas (n = 6) sugiere que son utilizadas por organismos de otros taxones como portadores de huevos o larvas.

Abstract The study of planktonic mollusks is a relevant element to understand the dynamics of the benthic communities under present and future environmental conditions. We present the description of the biodiversity of planktonic gastropods at 2 sampling sites on the Pacific coast of the Baja California Peninsula, Mexico. Organisms collected from plankton tows at 2 locations (Cabo Tosco, n = 89 and La Bocana, n = 213) were sequenced for a portion of the 18S rDNA gene. High diversity was registered, with 71 Molecular Operational Taxonomic Units (MOTUs), which contrasts with the low phenotypic diversity of stereoscopic images. Differences in community composition between and within sampling sites indicate that planktonic gastropod distribution is not random but probably modulated by micro-environmental processes such as currents or biological events. The presence of non-gastropod sequences within some shells (n = 6) suggests their use as carriers of eggs or larvae of other taxa.

https://doi.org/10.22201/ib.20078706e.2023.94.4968

15.

On the presence of Branchiostoma elongatum juveniles (Cephalochordata: Branchiostomatidae) on the north-central coast of Chile
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Mujica, Armando

; Nava, María Luisa

; Leiva-Dietz, Francisco

Latin american journal of aquatic research

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Sep 2022, Volumen 50 Nº 4 Paginas 622 - 627

Resumen: En | Texto: En | PDF: En

ABSTRACT The presence of juvenile Branchiostoma elongatum captured in plankton samples from the north-central coast of Chile during February-March of consecutive years (2013-2020) is described. Its low abundance showed interannual variation as well as its frequency of occurrence. Its geographical distribution was preferably coastal. It covered the entire sampling area (1-20 nm from the coast) longitudinally, and specimens were captured between the extreme north of the sampling area and 30°20’S. The lowest abundances were found in years of negative thermal anomalies (2017-2018) and the highest mainly in neutral conditions (2013-2015).

https://doi.org/10.3856/vol50-issue4-fulltext-2879 87 descargas

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