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au:"Acuña, Fabián H."

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Hydra-Amoeba system: a double infection with a lethal ending HydraAmoeba Hydra Amoeba system
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DESERTI, MARIA I.

; LORENZO-MORALES, JACOB

; ACUÑA, FABIÁN H.

Anais da Academia Brasileira de Ciências

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2023, Volume 95 N. 1 elocation e20211025

Abstract: En | Text: En | PDF: En

Abstract Within each ecosystem, organisms and populations maintain a complex set of relationships. These interactions can determine the distribution area of a species and play an essential role in its evolution. Parasites are ubiquitous components of nature and have a high influence on various aspects of the biology and ecology of organisms, affecting the populations of their hosts and, therefore, their communities and ecosystems. Free-living amoebae are unicellular organisms that can be found in water, soil or air. Some species are of great importance in human health. In Hydra, there are several reports of Hydramoeba hydroxena infections. In this work we present a double parasitosis: two concatenated infectious periods in the host polyp of Hydra vulgaris and Hydra vulgaris pedunculata for three freshwater bodies in the province of Buenos Aires, Argentina. Hydramoeba sp. and Acanthoamoeba sp. unchain a series of anatomical lesions that in all cases cause the death of the polyps due to total disintegration. This finding becomes important at a sanitary level due to the appearance of Acanthoamoeba sp. in waters associated with human recreational activities; For the Hydra genus, the importance lies at an ecological and evolutionary level, considering the possible impact on its natural populations. ecosystem relationships evolution therefore ecosystems Freeliving Free living water air health infections parasitosis Aires Argentina sp disintegration activities genus

https://doi.org/10.1590/0001-3765202320211025

New record of Anthopleura radians (Cnidaria: Actiniaria: Actiniidae) from the Mexican Pacific
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Vassallo-Avalos, Aurora

; Acuña, Fabián H.

; González-Muñoz, Ricardo

; Rivas, Gerardo

Latin american journal of aquatic research

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nov 2020, Volume 48 N. 5 Pages 869 - 876

Abstract: En | Text: En | PDF: En

ABSTRACT As part of a biodiversity study on intertidal invertebrates, several sea anemones from the west coast of the Baja California Peninsula were collected in June 2016. The taxonomic features of four specimens agree well with those of the species Anthopleura radians, a recently described sea anemone from northern Chile. This study is the first published report on this species outside the range of distribution documented in the original description, including new images of A. radians' external and internal features and complete characterization of their cnidae. Differences between A. radians from other species of the genus reported from the eastern Pacific are also discussed.

https://doi.org/10.3856/vol48-issue5-fulltext-2418 194 downloads

The sea anemone Exaiptasia diaphana (Actiniaria: Aiptasiidae) associated to rhodoliths at Isla del Coco National Park, Costa Rica
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Acuña, Fabián H.

; Cortés, Jorge

; Garese, Agustín

; González-Muñoz, Ricardo

Revista de Biología Tropical

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mar 2020, Volume 68 Suppl. 1 Pages 283 - 288

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

Resumen Introducción: La diversidad de anémonas de mar en el Parque Nacional Isla del Coco, Costa Rica, está aún poco estudiada. Objetivo: Reportar por primera vez la presencia de la anémona de mar Exaiptasia diaphana. Métodos: Algunos rodolitos fueron examinados in situ en Punta Ulloa a 14 m. de profundidad mediante SCUBA durante la expedición UCR-UNA-COCO-I al Parque Nacional Isla del Coco el 24 de abril de 2010. Especímenes vivos fijados sobre rodolitos fueron fotografiados y sus medidas y carácterísticas morfológicas externas fueron registradas in situ. Resultados: Varios individuos de E. diaphana fueron observados sobre rodolitos y observamos repetidamente pequeños individuos rodeando a un individuo mayor (presumiblemente la anémona fundadora) sobre rodolitos de Punta Ulloa. Conclusiones: La distribución geográfica de esta especie es extendida, como así también su distribución batimétrica desde el intermareal hasta los 14 m de profundidad. Las imágenes obtenidas aportan evidencia de reproducción clonal por laceración pedal.

Abstract Introduction: The sea anemones diversity is still poorly studied in Isla del Coco National Park, Costa Rica. Objective: To report for the first time the presence of the sea anemone Exaiptasia diaphana. Methods: Some rhodoliths were examined in situ in Punta Ulloa at 14 m depth, by SCUBA during the expedition UCR-UNA-COCO-I to Isla del Coco National Park on 24th April 2010. Living anemones settled on rhodoliths were photographed and its external morphological features and measures were recorded in situ. Results: Several individuals of E. diaphana were observed on rodoliths and we repeatedly observed several small individuals of this sea anemone surrounding the largest individual in an area (presumably the founder sea anemone) on rhodoliths from Punta Ulloa. Conclusions: The geographic distribution is extended as well as their bathymetric distribution from the intertidal to 14 m depth. The photographs provide evidence of clonal reproduction by pedal laceration.

https://doi.org/10.15517/rbt.v68is1.41191

Trophic ecology of the intertidal sea anemone Bunodosoma zamponii (Cnidaria, Actiniaria): diet composition, seasonal variation and trophic parameters
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ERRALDE, STEFANÍA M.

; ACUÑA, FABIÁN H.

Anais da Academia Brasileira de Ciências

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2020, Volume 92 elocation e20190520

Abstract: En | Text: En | PDF: En

Abstract Sea anemones are considered as polyphagous opportunistic predators and it has been suggested that their diet reflects the structure of the community they inhabit. The feeding ecology of intertidal species is an interesting topic to study due to their wide variety of strategies to obtain food. In this sense, we studied the diet of Bunodosoma zamponii, the most abundant actiniarian in the rocky intertidal of Punta Cantera (Mar del Plata, Argentina). The objectives were to describe it and compare its composition seasonally and between diurnal and nocturnal high tides. We examined the gastric cavity content of 154 specimens collected seasonally at both diurnal and nocturnal high tides, and 39 different prey items were identified, some of which are recorded here for the first time for this species. No variations on diet composition were found between seasons or between diurnal and nocturnal high tides, suggesting that the food available does not vary either. Bunodosoma zamponii ingests mostly items with low biomass, which contribute to the total biomass ingested in direct proportion to their frequency in the diet. The bivalve Brachidontes rodriguezii was the main prey for the anemone, followed to a lesser extent by certain amphipods, other mollusks and algae.

https://doi.org/10.1590/0001-3765202020190520 566 downloads

Cnidom variation through distinct developmental stages in the sea anemone Aulactinia marplatensis (Zamponi, 1977) (Cnidaria: Actiniaria)
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GARESE, AGUSTÍN

; GONZÁLEZ-MUÑOZ, RICARDO

; ACUÑA, FABIÁN H.

Anais da Academia Brasileira de Ciências

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2019, Volume 91 N. 1 elocation e20171039

Abstract: En | Text: En | PDF: En

The cnidae are the exclusive diagnostic structures of phylum Cnidaria. The inventory of all cnidae types of a particular species is called the cnidom. The study of cnidae has been widely addressed in all classes of cnidarians. Particularly in the order Actiniaria (sea anemones), the study of the composition, size and distribution of cnidae is essential to the identification and description of species. In the present study, we examine the cnidom of the sea anemone Aulactinia marplatensis in three different stages of development throughout its life cycle. We found that the composition and abundance patterns are very similar between the adult and juvenile stages, although significant differences in the size capsules were found between both stages and in all cnidae types observed, being bigger those from the adult forms. The planula larvae stage presents a less diverse cnidom in comparison to the juvenile and adult stages; however, it presents an exclusive cnidae type (the mesobasic p-mastigophore) which is the biggest in size of all the cnidae types observed in the species. These results highlight the importance of considering the stage of development when cnidae is used as a diagnostic character, and the particular relevance of the study of the cnidom in larval stages.

https://doi.org/10.1590/0001-3765201920171039 1135 downloads

The sea anemone Bunodactis octoradiata (Anthozoa: Actiniaria) from southern Patagonia: morphological study and new records
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Garese, Agustín

; Longo, María V.

; Martin, Juan P.

; Acuña, Fabián H.

Zoologia (Curitiba)

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oct 2014, Volume 31 N. 5 Pages 475 - 481

Abstract: En | Text: En | PDF: En

Bunodactis Verril, 1899 comprises at present 19 nominal species of sea anemones. The validity of the genus is under discussion. The description of the species, Bunodactis octoradiata Carlgren, 1899, is insufficient for reliable identification, and although subsequent works have provided additional information on the species, its description still needs to be complemented. Herein we describe B. octoradiata based on histological sections of the internal anatomy, and give a complete and detailed description of the external anatomy. The cnidom is composed of spirocysts, basitrichs and microbasic p-mastigophores; their distribution in the organism, sizes and relative abundances are provided. The presence of zooxanthellae is reported for the first time. Bunodactis octoradiata is distributed in groups that vary from 5.6 to 45 ind./m² in the field. Additionally, our data extends the distribution of the species along the coast of southern Patagonia (47°44'36"-49°15'13"S and 65°50'26"-67°39'45"W).

https://doi.org/10.1590/S1984-46702014000500007 2312 downloads

New records of sea anemones (Cnidaria: Anthozoa) from Costa Rica
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Acuña, Fabián H

; Garese, Agustín

; Excoffon, Adriana C

; Cortés, Jorge

Revista de biología marina y oceanografía

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apr 2013, Volume 48 N. 1 Pages 177 - 184

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

Despite being important components in coastal marine systems, sea anemones have been poorly studied on both coasts of Costa Rica. In this paper new records of sea anemones are mentioned for the Caribbean and Pacific coasts of Costa Rica and the Isla del Coco National Park. Additionally, the presence of other species previously recorded in Costa Rica based on single observations or photos, is reconfirmed. An updated inventory of these cnidarians is provided, and with the corallimorpharians, comprises of 16 species (10 in the Caribbean and 6 in the Pacific and Coco Island). A comparison with the sea anemone fauna of Panama is added.

A pesar de ser componentes importantes en los sistemas marino-costeros, las anémonas de mar han sido poco estudiadas en las costas de Costa Rica. En el presente trabajo se dan a conocer registros nuevos de anémonas de mar para las costas del Caribe y Pacífico de Costa Rica, incluyendo el Parque Nacional Isla del Coco. Se han confirmado también la presencia de otras especies que habían sido registradas para Costa Rica, pero sólo en base a observaciones visuales o fotografías. Se actualiza el inventario de este grupo de cnidarios que, junto a los corallimorpharios, está constituido por 16 especies (10 en el Caribe y 6 en el Pacífico e Isla del Coco). Asimismo, se realiza una comparación entre las faunas de anémonas de mar de Costa Rica y Panamá.

2758 downloads

Ocurrence of the sea anemone Telmatactis panamensis (Verrill, 1869) (Cnidaria: Anthozoa: Actiniaria) at Isla del Coco National Park, Costa Rica
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Acuña, Fabián H.

; Cortés, Jorge

; Garese, Agustín

Revista de Biología Tropical

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nov 2012, Volume 60 Suppl. 3 Pages 201 - 205

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

La fauna de anémonas de mar es prácticamente desconocida para el Parque Nacional Isla del Coco (Costa Rica). En el presente trabajo se reporta por primera vez la presencia de la especie Telmatactis panamensis. Individuos de esta anémona de mar fueron colectados en el intermareal de Bahía Chatham y a 15m de profundidad en Punta Ulloa, en ambos casos adheridas a rocas; durante la expedición UCR-UNA-COCO-I en Abril de 2010. Se proveen fotografías de ejemplares vivos, datos de su anatomía externa y un inventario del cnidae de los especímenes estudiados. Posiblemente esta especie se extienda a mayor profundidad, tal como fue observado por otros autores para ejemplares de las Islas Galápagos.

The sea anemone fauna of Isla del Coco National Park (also known as Cocos Island Nacional Park), Pacific Costa Rica is poorly known. In the present work we report the first occurrence of the species Telmatactis panamensis. Individuals of this sea anemone (n=24) were collected at Chatham Bay intertidal and at 15m depth in Punta Ulloa, in both cases attached to rocks; during the expedition UCR-UNA-COCO-I in April 2010. We provide photographs of live individuals, external anatomy and an inventory of cnidae of the studied specimens. Possibly this species is extended to greater depth as observed by other authors in the Galápagos Islands.

1186 downloads

Sea Anemones (Cnidaria: Actiniaria and Corallimorpharia) from Panama
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Garese, Agustín

; Guzmán, Héctor M

; Acuña, Fabián H

Revista de biología marina y oceanografía

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dec 2009, Volume 44 N. 3 Pages 791 - 802

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

A partir de la literatura existente se realizó una lista actualizada y revisada de las anémonas de mar de ambas costas de Panamá, que incluyó 26 especies válidas (22 pertenecientes al orden Actiniaria, tres al orden Corallimorpharia y una especie de ubicación sistemática incierta). La especie Calliactis polypus es un registro nuevo para esta región. Siete de las especies se conocen solamente en Panamá. La riqueza de especies es predominante en el Golfo de Panamá, debido probablemente a un esfuerzo de muestreo mayor y desproporcionado en relación a otras zonas. El hecho que los registros existentes estén fuertemente sesgados hacia un centro de intenso muestreo, indica la necesidad de muestreos adicionales en otras áreas. Estudios posteriores deberán estar orientados no sólo a la búsqueda de nuevos taxa, sino también a la verificación de las descripciones y el status taxonómico de las especies registradas.

5135 downloads

10.

PERSPECTIVES OF MARINE BIODIVERSITY STUDIES IN ARGENTINA
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Lutz, Vivian A

; Boschi, Enrique E

; Bremec, Claudia S.

; Cousseau, María Berta

; Figueroa, Daniel E.

; Rodríguez, Diego H.

; Scarlato, Norberto

; Viñas, María Delia

; Lewis, Mirtha N.

; Penchaszadeh, Pablo E.

; Acuña, Fabián H

; Aguirre, Marina L.

; Akselman, Rut

; Alder, Viviana A.

; Baldoni, Ana

; Barría, María S.

; Bastida, Ricardo O.

; Boraso, Alicia S.

; Calvo, Jorge

; Campagna, Claudio

; Cañete, Guillermo

; Cassia, María C.

; Cervellini, Patricia M.

; Chiaramonte, Gustavo E.

; Costagliola, Marcela

; Cosulich, Guillermina

; Daponte, María C.

; Díaz de Astarloa, Juan M.

; Elías, Rodolfo

; Esnal, Graciela B.

; Excoffon, Adriana C.

; Freije, Hugo

; García de la Rosa, Susana

; Genzano, Gabriel N.

; Giberto, Diego A.

; Guerrero, Raúl

; Helbling, Walter

; Hoffmeyer, Mónica S.

; Incorvaia, Inés S.

; Iribarne, Oscar

; Jaureguizar, Andrés J.

; Kogan, Mariela

; Lovrich, Gustavo A

; Madirolas, Adrián O.

; Martin, Juan P.

; Martos, Patricia

; Mendoza, María L.

; Marque, Silvina Menu

; Mianzán, Hermes W.

; Morriconi, Elba R.

; Negri, Rubén M.

; Obenat, Sandra

; Pastor de Ward, Catalina T.

; Pérez de Fankhauser, Laura B.

; Quintana, Flavio

; Reta, Raúl

; Rico, Rita

; Roux, Ana M.

; Sabatini, Marina E.

; Scelzo, Marcelo A.

; Schejter, Laura

; Schiavini, Adrián C.M.

; Silva, Ricardo I.

; Silvoni, María G.

; Spivak, Eduardo

; Trucco, María I.

; Vallarino, Eduardo A.

; Zelaya, Diego G.

Gayana (Concepción)

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2003, Volume 67 N. 2 Pages 371 - 382

Abstract: En | Text: En | PDF: En

2207 downloads

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