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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.

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

Rotifers of Bahia State, Brazil: News records and limitations to studies
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Rocha, M. A.

; Silva, M. B.

; Bonecker, C. C.

; Anjos, M. S. dos

; Melo, P. A. M. C.

Brazilian Journal of Biology

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2022, Volume 82 elocation e236345

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo É fornecida uma primeira lista de verificação das espécies de Rotifera em ambientes de água doce no Estado da Bahia, nordeste do Brasil. A lista de espécies inclui dados de amostragem de 26 ambientes aquáticos (lóticos e lênticos) de 2010 a 2016. Cento e cinquenta e cinco espécies foram registradas, com 68 novos registros para o estado. As famílias Brachionidae e Lecanidae foram as mais representativas (54,8%). A maior riqueza foi registrada no rio Colônia (57 espécies). Esses resultados provavelmente refletem o número de estudos na região, sugerindo mais pesquisas sobre a biodiversidade de Rotifera na Bahia, o quinto maior estado do Brasil (567.295 km2) com grande número de corpos aquáticos de água doce.

Abstract A first checklist of Rotifera species in freshwater environments in Bahia State, in northeastern Brazil, is provided. The list includes sampling data from 26 aquatic environments (lotic and lentic) undertaken from 2010 to 2016. One hundred and fifty-five species were recorded, with 68 new records for the state. The family Brachionidae and Lecanidae were the most representative (54.8%). The greatest richness was recorded in the Colônia River (57 species). Those results reflect the low numbers of studies previously undertaken in the region, indicating more research needs to be focused on Rotifera biodiversity in Bahia, the fifth largest state in Brazil (567,295 km2) with large numbers of freshwater bodies.

https://doi.org/10.1590/1519-6984.236345 271 downloads

Non-predatory mortality of planktonic microcrustaceans (Cladocera and Copepoda) in neotropical semiarid reservoirs
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DINIZ, LEIDIANE P.

; FRANÇA, ELTON J.

; BONECKER, CLAUDIA C.

; MARCOLIN, CATARINA R.

; MELO JÚNIOR, MAURO DE

Anais da Academia Brasileira de Ciências

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2021, Volume 93 N. 2 elocation e20190991

Abstract: En | Text: En | PDF: En

Abstract The accuracy of traditional methods to sample planktonic microcrustaceans depends on two assumptions: that organisms are alive during sampling and that all carcasses can be identified despite their degradation state, but fresh carcasses are not easy to distinguish by traditional methods. Previous studies about mortality have shown that neglecting dead organisms can provide biased ecological information. Thus, our objective was to determine the mortality rate and the proportion of dead microcrustacean in three tropical reservoirs. Sampling was carried out in 12 stations during two periods. The proportion of dead organisms was verified using aniline blue and it varied between 0.6% and 90.6%. The carcass decomposition period varied between 3 to 16 days and microcrustaceans mortality rate varied between 0.005 and 0.314 d-1. Traditional preservation techniques with formalin do not significantly overestimate species abundance. However, these values should not be disregarded, because corrected (disregarding organisms that were dead) and formalin-preserved abundances were correlated with distinct limnological descriptors. Therefore, the traditional formalin preservation technique could provide misleading ecological interpretations. Other studies over larger temporal scales in addition to experiments to evaluate the effects of viruses, parasitism and the toxic effects of cyanobacteria on zooplankton would enlighten mortality rate patterns in freshwater ecosystems.

https://doi.org/10.1590/0001-3765202120190991 558 downloads

Predation by an omnivorous fish and food availability alter zooplankton functional diversity: a microcosm approach
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AMARAL, DIOGO C.

; DUNCK, BÁRBARA

; BRAGHIN, LOUIZI S.M.

; FERNANDES, UBIRAJARA L.

; BOMFIM, FRANCIELI F.

; BONECKER, CLÁUDIA C.

; LANSAC-TÔHA, FÁBIO A.

Anais da Academia Brasileira de Ciências

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2021, Volume 93 elocation e20200778

Abstract: En | Text: En | PDF: En

Abstract Studies considering the functional traits of organisms, populations, and communities functional indices increase the understanding of many factors on ecosystem functioning. Here, we analyze the predation effect (by fish) on zooplankton functional diversity and the effects of biomass and density of periphytic algae on zooplankton feeding type trait and body size. We expect that intense predation by fish on zooplankton leads to higher values of zooplankton functional diversity and that food resource will be positively related to the abundance of zooplankton trait and body size. For that, microcosms were established (T1- fish-absence, and T2- fish-presence, both with periphytic algae as food). We observed that fish presence decreased zooplankton functional diversity through modifications in the availability of nutrients and algae, through the middle-out effect. We also observed that body size had a negative relationship with the food resource, reaffirming that high food availability in subtropical lakes is linked to small-bodied zooplankton. The raptorial copepods covariate positively with the periphytic algae, which was an alternative food resource and, in this case, the main form of carbon input into the system. In this study, omnivorous fish reduced zooplankton functional traits, which can alter the energy stock and energy flow in aquatic ecosystems.

https://doi.org/10.1590/0001-3765202120200778 120 downloads

Swimming behavior of newly hatched larvae of six decapod species (Crustacea: Decapoda)
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Almeida, Eduardo Vianna de

; Cardoso, Carolina dos Santos

; Souza, Manoela dos Santos

; Bonecker, Sérgio Luiz Costa

Nauplius

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2021, Volume 29 elocation e2021023

Abstract: En | Text: En | PDF: En

Abstract Crustacean decapod larvae have developed several adaptations to maximize their survival, including swimming behavior. Swimming improves larvae dispersal and contributes to their response to environmental stresses, including variations in abiotic factors, presence of predators, and search for food. Data on larval behavior can also assist in studies on conservation and in species management in aquaculture. Unfortunately, swimming behavior remains unstudied in many species. The present work aims to analyze the swimming behavior in newly hatched larvae of six common decapod crustaceans in coastal Southeast Brazil (Macrobrachium acanthurus, Macrobrachium olfersii, Emerita brasiliensis, Ucides cordatus, Minuca rapax, and Callinectes danae). The analysis included tests with larval responses to four isolated stimuli: gravity (geotaxis), vertical salinity gradients, low-pressure zones, and presence of the planktivorous fish, Atherinella brasiliensis (only for C. danae and M. rapax). The first two and the last two stimuli were used as indicators of dispersal and defensive behaviors, respectively. All larvae preferred water depth with higher salinity levels. Additionally, negative geotaxis was observed in M. olfersii, M. acanthurus, U. cordatus, and C. danae, being stronger in the last. Both Macrobrachium larvae responded to low-pressure zones, promptly moving away. Callinectes danae and M. rapax larvae avoided contact with the predatory fish by creating avoidance zones around it, even in the absence of light. This is an active defensive behavior that has never been reported for the newly hatched larvae of these two species.

https://doi.org/10.1590/2358-2936e2021023 209 downloads

Influence of the chlorophyll-a gradient on the community structure of plankton microcrustaceans (Cladocera and Copepoda) in a Neotropical reservoir
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TIBÚRCIO, VANESSA G.

; MANTOVANO, TATIANE

; DA SILVA, JOÃO V.F.

; BONECKER, CLAUDIA C.

Anais da Academia Brasileira de Ciências

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2021, Volume 93 N. 2 elocation e20190379

Abstract: En | Text: En | PDF: En

Abstract Fish farming in net cages is considered as an alternative to food production in response to elevated population growth, and zooplankton is an important resource to the development of this economic activity. We (i) compared microcrustacean composition in eutrophic and oligotrophic habitats under net tank influence, (ii) investigated changes in species distributions in these habitats, and (iii) indicated which chlorophyll-a concentrations presented thresholds that alter community structure. We expected different responses of species to changes in chlorophyll-a concentration due to net cage management, as chlorophyll-a represents an estimate of food availability. Microcrustacean samplings and chlorophyll-a estimation were made upstream, downstream and close to the net cages, during 120 days, in the Rosana Reservoir (Brazil). Species composition differed significantly (p<0.05) among habitats where in the eutrophic environment was found the largest number of species. However, only in the eutrophic habitats did frequency of occurrence and relative abundance of some species change with chlorophyll-a variation. Thus, net cage management influenced species distribution only in the most productive habitat. These responses can affect ecosystem processes related to trophic dynamics as secondary productivity and nutrient cycling.

https://doi.org/10.1590/0001-3765202120190379 97 downloads

Variação da composição e abundância das espécies da Classe Appendicularia e seu uso como potenciais bioindicadoras de regiões e massas de água superficiais na área da Bacia de Campos, Rio de Janeiro, Brasil
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Carvalho, Pedro F. de

; Bonecker, Sérgio L. C.

Iheringia. Série Zoologia

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2016, Volume 106 elocation e2016022

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO Estudos sobre a variação espacial das espécies de apendiculárias e sua relação com as massas de água são raros, principalmente no Atlântico Sul. O atual estudo pretende preencher a lacuna de conhecimento sobre a abundância, composição específica e a função de bioindicadora das apendiculárias, em diferentes regiões (plataforma continental e talude) e massas de água, no Atlântico Sul Ocidental. As coletas foram realizadas no período chuvoso (de fevereiro a abril de 2009) e no período seco (de agosto a setembro de 2009) na camada subsuperficial. As massas de água encontradas na superfície na plataforma continental da área de estudo foram a Água Tropical (AT), que predominou no período chuvoso, e a Água Costeira (AC), que predominou no período seco. Em ambos os períodos de coleta não foram registradas a presença da Água Central do Atlântico Sul (ACAS) na superfície na plataforma continental. As apendiculárias foram mais abundantes na região de plataforma continental influenciada pela AC. Foi identificado um total de 12 espécies da Classe Appendicularia. Oikopleura longicauda Vogt, 1854 e O. fusiformis Fol, 1872 foram as espécies mais abundantes. Oikopleura dioica Fol, 1872 foi encontrada exclusivamente na plataforma continental na AC. Apesar não ser observado a presença de ACAS na superfície, altos valores da densidade de apendiculária em frente a Cabo Frio sugerem a influência de uma pós-ressurgência no local. Também foram observados valores elevados na abundância das apendiculárias em frente ao rio Paraíba do Sul, com influência da AC. Este fato sugere a alta capacidade de incremento de nutrientes desse aporte fluvial. A variação espacial e as diferentes massas de água influenciaram a abundância e a composição das apendiculárias. Dentre as espécies identificadas, somente O. longicauda foi considerada como bioindicadora da AC.

ABSTRACT Studies about the relationship of the species of appendicularians with spatial gradients and water masses are rare, especially in the South Atlantic. The present study aims to fill the knowledge gap about the abundance of the community of appendicularians and on their bioindicator function in different regions (continental shelf and slope), with influence of different water masses in the South Atlantic. Sampling was conducted in the rainy season (February-April 2009) and the dry season (August-September 2009) in the subsurface layer. The water masses found on the continental shelf of the study area were the Tropical Water (AT), which was prevalent during the rainy season, and the Coastal Water (AC), which was prevalent in the dry season. In both sampling periods has not registered the presence of SACW on the surface over continental shelf. The appendicularians were more abundant in the region of the continental shelf influenced by the CW. A total of 18 species of appendicularian was registered. Oikopleura longicauda Vogt, 1854 and O. fusiformis Fol, 1872 were the most abundant appendicularian. Oikopleura dioica Fol, 1872 was found exclusively in the continental shelf on the CW. In despite of the SACW water had not registered on the surface, the presence of, high values of density of appendicularians in front of Cabo Frio region suggest the influence of an upwelling event in a anterior period in the region. In relation to the appendicularians abundance, high values were also observed in front of the Paraíba do Sul river with the CW influence. This fact suggests a high nutritional contribution of this river in the coastal marine area adjacent. The spatial variation and different water masses influenced the abundance and the composition of appendicularians. Among the species identified, only O. longicauda was considered as a bioindicator of the CW.

https://doi.org/10.1590/1678-4766e2016022 1789 downloads

Daily variation of zooplankton abundance and evenness in the Rosana reservoir, Brazil: biotic and abiotic inferences
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Takahashi, Érica M.

; Lansac-Tôha, Fábio A.

; Dias, Juliana D.

; Bonecker, Claudia C.

Iheringia. Série Zoologia

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mar 2014, Volume 104 N. 1 Pages 21 - 31

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

A comunidade zooplanctônica apresenta flutuação temporal estocástica e variação espacial heterogênea que são determinadas pelas relações entre os organismos e condições ambientais. Acredita-se que a distribuição temporal e espacial do zooplâncton seja heterogênea e discreta, respectivamente; e que a variação diária das espécies mais abundantes está relacionada às condições ambientais, principalmente, disponibilidade de recursos. As amostras de zooplâncton foram coletadas diariamente em três estações de amostragem em um braço lateral do reservatório de Rosana (SP/PR). O zooplâncton não apresentou diferenças significativas na abundância e equitabilidade entre as estações de amostragem, no entanto, a variação temporal desses atributos foi significativa. As variáveis abióticas e a disponibilidade de recurso algal explicou significativamente a variação diária das espécies mais abundantes (p<0,001), entretanto, a distribuição das espécies faz inferências sobre relações bióticas entre elas. Assim, não só a disponibilidade de recurso alimentar é influente na abundância das principais espécies zooplanctônicas, mas sim um conjunto de fatores (variáveis abióticas e relações bióticas).

The zooplankton community presents stochastic temporal fluctuation and heterogeneous spatial variation determined by the relationships among the organisms and environmental conditions. We predicted that the temporal and spatial zooplankton distribution is heterogeneous and discrete, respectively, and that the daily variation of most abundant species is related to environmental conditions, specifically the availability of resources. Zooplankton samples were collected daily at three sampling stations in a lateral arm of the Rosana Reservoir (SP/PR). The zooplankton did not present significant differences in abundance and evenness among sampling stations, but the temporal variation of these attributes was significant. Abiotic variables and algal resource availability have significantly explained the daily variation of the most abundant species (p<0.001), however, the species distribution makes inferences on biotic relationships between them. Thus, not only the food resource availability is influential on the abundance of principal zooplankton species, but rather a set of factors (abiotic variables and biotic relationships).

https://doi.org/10.1590/1678-4766201410412131 2492 downloads

Intra and inter-annual structure of zooplankton communities in floodplain lakes: a long-term ecological research study
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Simões, Nadson R.

; Lansac-Tôha, Fábio A.

; Velho, Luiz F. M.

; Bonecker, Claudia C.

Revista de Biología Tropical

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dec 2012, Volume 60 N. 4 Pages 1819 - 1836

Abstract: Es En | Text: Es En | PDF: Es | PDF: En

El manejo del régimen de inundación ha cambiado de manera significativa la dinámica natural de las inundaciones, que son responsables de la estructura y dinámica de las comunidades acuáticas en sistemas río-planicie de inundación. En este sentido, investigamos cómo la estructura de las comunidades zooplanctónicas responde a variaciones estacionales e interanuales en los sistemas de llanura de inundación, y los factores biológicos asociados con la abundancia de especies de las comunidades zooplanctonicas. Elaboramos también, un marco conceptual que describe los principales factores ecológicos asociados con la estructura de las comunidades para los sistemas del Alto río Paraná. Para ello se realizaron muestreos cada seis meses (potamophase en marzo y en septiembre limnophase) para caracterizar las variaciones intra e interanuales en la estructura de la comunidad entre 2000 y 2008. Las diferencias estacionales de la riqueza de especies, abundancia, índice de diversidad de Shannon y equitatividad, se llevaron a cabo utilizando procedimientos Bayesianos para mostrar predicciones probabilísticas de los datos ajustados para las principales fuentes variación. Análisis de ordenamiento no-métrico multi-dimensional (NDMS); procedimientos de permutación de respuestas múltiples (MRPP) y análisis de especies indicadoras (IndVal) fueron utilizados para evaluar y clasificar la estacionalidad de la estructura de la comunidad. Durante aguas altas (potamofase), la conectividad hidrológica favoreció el intercambio y dispersión de las especies en algunas lagunas, incrementando la diversidad local; durante aguas bajas (limnofase), la alta productividad local favoreció los táxones oportunistas, incrementando las especies dominante y disminuyendo la diversidad local. La disponibilidad de recursos alimenticios y la densidad de pequeños peces fueron los factores biológicos asociados con la dinámica estacional de la comunidad zooplanctonica; los cuales dependen de la fase hidrosedimentológica (potamofase o limnofase). Modificaciones del régimen hidrológico y limnológico relacionados con el manejo de inundación han promovido el reemplazo y empobrecimiento de la biota acuática, en las lagunas sin conexión afectadas, enfatizando así la importancia ecológica de la dinámica natural de inundaciones, que presenta pulsos regulares de inundación. El modelo conceptual que se presenta abarca desde interacciones entre diversas variables ambientales hasta mecanismos más comprensibles de las principales fuentes de variación de la comunidad.

Water flow management has significantly changed the natural dynamic of floods, which are responsible for the structure and dynamic of aquatic communities in river-floodplain systems. With the aim to elaborate a conceptual framework that describes the main ecological factors associated with zooplankton community structure in the Upper Paraná River, we investigated the mechanisms that regulate the communities structure and their response to inter-annual and hydro-sedimentological variations in the floodplain and the biological factors associated with species abundance in those communities. For this we conducted samplings every six months (potamophase in March and limnophase in September) to characterize intra and inter-annual variations in community structure between 2000 and 2008. The intra-annual differences on the species richness, abundance, Shannon diversity index, and evenness, were conducted using Bayesian procedures to show probabilistic predictions of the data fit to main variation sources. Non-metric multi-dimensional scaling (NMDS), multi-response permutation procedure (MRPP), and indicator species analysis (IndVal) were run to assess and characterize the seasonality of the community structure. During high water (potamophase), hydrologic connectivity favoured exchange and dispersal of species in some lakes, increasing local diversity; during low water (limnophase), higher local productivity favoured opportunistic taxa, increasing species dominance and decreasing local diversity. Food resources and density of small-size fish were biological factors associated with the seasonal dynamic of the zooplankton community; these factors were dependent on hydrosedimentological phase (potamophase or limnophase). Water levels and limnological modifications related to water flow management have promoted replacement and impoverishment of aquatic biota in affected lakes and have indicated the ecological importance of a natural dynamic flood, which displays regular flood pulses. The conceptual model presented encompassed interactions between diverse environmental variables to more understandable mechanisms of the main sources of community variation.

2475 downloads

10.

Zooplankton community resilience and aquatic environmental stability on aquaculture practices: a study using net cages
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Dias, JD

; Simões, NR

; Bonecker, CC

Brazilian Journal of Biology

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feb 2012, Volume 72 N. 1 Pages 1 - 11

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

A piscicultura em tanques rede causa mudanças nas condições ambientais. Este estudo avaliou a resiliência do zooplâncton em áreas de cultivo de peixes no reservatório de Rosana (rio Paranapanema, PR-SP). As coletas foram realizadas próximo aos tanques rede, e, a montante e a jusante deles, antes e após a instalação dos tanques. A resiliência foi estimada utilizando a diminuição na abundância dos grupos após a instalação dos tanques. A comunidade zooplanctônica foi representada por 106 espécies. As espécies mais abundantes foram Synchaeta pectinata, S. oblonga, Conochilus coenobasis, Polyarthra dolichoptera e C. unicornis (Rotifera), Ceriodaphnia cornuta, Moina minuta, Bosmina hagmanni e C. silvestrii (Cladocera) e Notodiaptomus amazonicus (Copepoda). A resiliência dos microcrustáceos foi afetada nos pontos de cultivo, pois, esta atividade deixou o ambiente produtivo por mais tempo, atrasando a capacidade natural das respostas da comunidade. Os microcrustáceos, principalmente copépodes calanoides e ciclopoides tiveram diferentes taxas de retorno. A instalação dos tanques rede agiu como um fator de estresse sobre a comunidade zooplanctônica. Estratégias de gestão que causam menos riscos para os organismos e maximizam o fluxo de energia podem ajudar na manutenção da estabilidade do sistema.

Fish farming in net cages causes changes in environmental conditions. We evaluated the resilience of zooplankton concerning this activity in Rosana Reservoir (Paranapanema River, PR-SP). Samples were taken near the net cages installed at distances upstream and downstream, before and after net cage installation. The resilience was estimated by the decrease in the groups' abundance after installing the net cages. The zooplankton community was represented by 106 species. The most abundant species were Synchaeta pectinata, S. oblonga, Conochilus coenobasis, Polyarthra dolichoptera and C. unicornis (Rotifera), Ceriodaphnia cornuta, Moina minuta, Bosmina hagmanni and C. silvestrii (Cladocera) and Notodiaptomus amazonicus (Copepoda). The resilience of microcrustaceans was affected in the growing points as this activity left the production environment for longer, delaying the natural ability of community responses. Microcrustaceans groups, mainly calanoid and cyclopoid copepods, had a different return rate. The net cage installation acted as a stress factor on the zooplankton community. Management strategies that cause fewer risks to the organisms and maximize energy flow may help in maintaining system stability.

4123 downloads Cited 4 times in SciELO

11.

Zooplankton of an urban coastal lagoon: composition and association with environmental factors and summer fish kill
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Souza, Leonardo C. e

; Branco, Christina W. C.

; Domingos, Patrícia

; Bonecker, Sérgio L. C.

Zoologia (Curitiba)

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jun 2011, Volume 28 N. 3 Pages 357 - 364

Abstract: En | Text: En | PDF: En

Zooplankton may be regarded as a sensitive tool for monitoring environmental variations in coastal lagoons due to their ability to immediately react to changes in the water column trophic features and salinity levels. As a coastal lagoon with a broad history of anthropic influence, Rodrigo de Freitas Lagoon (Rio de Janeiro, Brazil) is widely used for water sports and artisanal fishing. The present study aimed to expand the knowledge base about zooplankton in the Rodrigo de Freitas Lagoon by assessing the composition and time-spatial distribution of the major zooplankton groups. Samples were collected fortnightly from at four distinct sampling points August 2001 to July 2002. At each point, salinity, temperature, dissolved oxygen and water transparency were measured. During the study period, the lagoon behaved as an spatially homogeneous environment in what regards the abiotic variables. However, all these variables showed significant differences along the time, mainly related to seasonality (air temperature and rainy and dry periods). The zooplankton community showed low taxonomic richness, with the predominance of species commonly found in coastal lagoons, especially with mesohaline conditions, as well as those found in estuaries. An interesting fact was the rise in zooplankton abundance at all sampling points right after a fish kill event. Such increase was caused mainly by the Brachionus plicatilis O.F. Müller 1786 species. Thus, the zooplankton community was affected by physical and chemical factors, mainly by the dissolved oxygen decline event and variations in the influx of seawater into the lagoon. In addition, phytoplankton availability and fish predation pressure were suggested as important regulating factors of the zooplankton community.

https://doi.org/10.1590/S1984-46702011000300010 2810 downloads

12.

New records of Monstrilloida Sars, 1901 (Crustacea: Copepoda) from Rio Grande do Norte (northeastern coast of Brazil)
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Dias, Cristina de Oliveira

; Medeiros, Guilherme Fulgêncio de

; Bonecker, Sérgio Luiz Costa

Biota Neotropica

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jun 2008, Volume 8 N. 2

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Durante uma série de amostragens de zooplâncton, realizadas durante o ano de 1984, na costa sul do estado do Rio Grande do Norte, Brasil, um total de 50 exemplares de copépodes Monstrilloida foram coletados. Os exemplares pertencem a quatro espécies (Monstrilla brasiliensis Suárez-Morales & Dias, Cymbasoma cf. longispinosum, Cymbasoma cf. rigidum and Cymbasoma gracilis Gurney). Os complexos taxonômicos formados pelas espécies C. cf. longispinosum e C. cf. rigidum em águas brasileiras são discutidos. Os comprimentos totais dos exemplares são fornecidos com a finalidade de contribuir com futuros estudos e revisões dos espécimes pertencentes a estes complexos de espécies. A espécie Monstrilla brasiliensis foi coletada pela primeira vez na região costeira do estado do Rio Grande do Norte, expandindo a sua distribuição geográfica na costa nordeste brasileira. Os resultados apresentados aumentam a quatro o número de espécies de Monstrilloida conhecidas para a costa do estado do Rio Grande do Norte.

During a series of zooplankton surveys carried out during 1984, off the south coast of the state of Rio Grande do Norte, Brazil, several species of monstrilloids were present in the samples. A total of 50 individuals of monstrilloid copepods were collected. These belong to four species (Monstrilla brasiliensis Suárez-Morales & Dias, Cymbasoma cf. longispinosum, Cymbasoma cf. rigidum, and Cymbasoma gracilis Gurney). The taxonomic complexes formed by the species C. cf. longispinosum and C. cf. rigidum in Brazilian waters are discussed. The lengths of the specimens are provided in order to contribute to studies and revisions of the specimens belonging to these species-complexes. The species Monstrilla brasiliensis is recorded for the first time in the Rio Grande do Norte coastal region, thus expanding its geographical range in the Brazilian northeastern coast. The results presented herein increase to four the number of species of Monstrilloida known from off Rio Grande do Norte state.

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13.

New records of Monstrilloida Sars, 1901 (Crustacea, Copepoda) on the Brazilian northeastern coast
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Dias, Cristina de Oliveira

; Bonecker, Sérgio Luiz Costa

Biota Neotropica

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2007, Volume 7 N. 2

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Durante uma série de amostragens de zooplâncton, realizadas de 2001 a 2005, na costa do estado de Bahia, Brasil, 98 exemplares de copépodes Monstrilloida foram coletados. Os exemplares pertencem a cinco espécies (Monstrilla grandis, Cymbasoma cf. longispinosum, Cymbasoma cf. rigidum, Cymbasoma gracilis and Cymbasoma quadridens). As primeiras três espécies foram coletadas pela primeira vez na região costeira do estado da Bahia. A distribuição geográfica de C. quadridens foi expandida para a costa nordeste brasileira. Os resultados apresentados aumentam a nove o número de espécies Monstrilloida conhecidas para a costa da Bahia. A diversidade ambiental do Canal de Caravelas, com áreas altamente produtivas e a proximidade de uma região de recifes de coral, abriga uma abundante e diversa fauna de Monstrilloida, que deve ser examinada mais detalhadamente.

During a series of zooplankton surveys carried out from 2001 through 2005 off the coast of the state of Bahia, Brazil, 98 individuals of monstrilloid copepods were collected. These belong to five species (Monstrilla grandis, Cymbasoma cf. longispinosum, Cymbasoma cf. rigidum, Cymbasoma gracilis, and Cymbasoma quadridens). The first three are recorded for the first time in the Bahia coastal region. The geographical range of C. quadridens is expanded to the Brazilian northeastern coast. The results presented herein increase to nine the number of nominal species of Monstrilloida known from off Bahia; the environmental diversity of Caravelas Channel with highly productive areas and coral reef zones harbor an abundant and diverse monstrilloid fauna that should be surveyed in more detail.

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14.

Rotifers of the upper Paraná River floodplain: additions to the checklist
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Serafim, M. Jr

; Bonecker, C. C.

; Rossa, D. C.

; Lansac-Tôha, F. A.

; Costa, C. L.

Brazilian Journal of Biology

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may 2003, Volume 63 N. 2 Pages 207 - 212

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Os rotíferos apresentam elevada diversidade em ambientes aquáticos continentais. Este estudo mostra novas ocorrências de 12 gêneros e 42 espécies desse grupo na planície de inundação do alto rio Paraná, o que incrementa o registro de 184 espécies para 230 espécies nesse ecossistema. Entre esses novos registros, algumas espécies ocorreram somente em lagoas e outras, apenas em rios. Foram encontradas 37 espécies na região litorânea e 34 na região pelágica dos ambientes estudados, dentre estas 3 espécies foram registradas apenas na primeira região e somente 2 na segunda região. As lagoas apresentaram os maiores valores de riqueza, provavelmente em razão da grande estabilidade, menor velocidade de corrente e presença de extensos bancos de macrófitas aquáticas. A presença de vegetação marginal permite grande diversificação de habitats, contribuindo para a ocorrência de um número expressivo de espécies na região litorânea. Esse fato contribuiu para a ocorrência de espécies não planctônicas no zooplâncton.

Rotifers present a high diversity in freshwater ecosystems. This study registered 11 genera and 42 species, new records for the Upper Paraná River floodplain. These results showed an increase in rotifer diversity in this ecosystem from 184 to 230 species. Among them some were registered only in the rivers and others in the lagoons. Thirty-seven species occurred in the littoral zone and 34 species in the pelagic; 3 species were registered only in the former zone and 2 species only in the latter. The lagoons presented the greatest richness, probably because of the greater stability, low current velocity, and the extensive aquatic macrophyte banks in the littoral zone of these environments as compared to those of the rivers. The highest number of species in the littoral habitats occurred due to the greater influence of shoreline vegetation, which allows greater habitat diversification. This fact contributed to the occurrence of non-planktonic species in the zooplankton samples.

9347 downloads Cited 2 times in SciELO

15.

Abundance of cladocerans in the littoral regions of two environments of the Upper Paraná River floodplain, Mato Grosso do Sul, Brazil
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ROSSA, D. C.

; LANSAC-TÔHA, F. A.

; BONECKER, C. C.

; VELHO, L. F. M.

Revista Brasileira de Biologia

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feb 2001, Volume 61 N. 1 Pages 45 - 53

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

A abundância de cladóceros no plâncton da região litorânea em dois ambientes (Rio Baía e Lagoa do Guaraná) da planície de inundação do alto Rio Paraná foi investigada, bem como a influência de algumas variáveis limnológicas sobre a densidade desses organismos em três estações na lagoa e duas no rio, no período de março/93 a janeiro/94. A maior abundância foi registrada na lagoa durante o período de águas altas. A família Bosminidae foi dominante em ambos os ambientes e períodos hidrológicos (águas altas e águas baixas). Chydoridae foi mais importante na lagoa e Sididae, no rio. Foi observado maior número de correlações de Pearson significativas (p < 0,03) entre as densidades das dez espécies numericamente mais importantes e das variáveis limnológicas no rio. Esses resultados sugerem que as variáveis limnológicas estudadas, provavelmente, influenciam mais na estrutura das populações de cladóceros no rio do que na lagoa. Por outro lado, outro fatores, como a estrutura física do ambiente ou a quantidade de vegetação presente nas margens, além das relações bióticas entre as populações, como competição e predação, parecem ser mais importantes para a dinâmica das principais espécies na lagoa.

The abundance of cladocerans recorded in plankton samples from the littoral regions of two enviroments (Baía River and Guaraná lake), the Upper Paraná River floodplain and some limnological variables important in controlling their abundance were investigated at three sites in the lake and two in the river, from March/93 to January/94. Abundance was highest in the lake, chiefly during high water. Bosminidae dominated in both environments and hydrological periods (high and low water). Chydoridae were more important in the lake, and Sididae in the river. A higher number of Pearson's correlations significative (p < 0.03) between the densities of the ten most important species and the limnological variables was observed in the river. This suggests that limnological variables are more important in controlling the abundance of cladocerans in the river. On the other hand, in the lake their abundance was probably associated with the physical structure of the environment, the abundance of aquatic macrophytes, and biotic relationships such as competition and predation.

3106 downloads Cited 3 times in SciELO

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