Macrobentos del área de Bahía Blanca (Argentina), distribución espacial de la fauna

Bremec, Claudia

doi:10.1590/s0373-55241990000200001

Cited by 10 publications

(3 citation statements)

References 9 publications

(6 reference statements)

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“…-The presence of colonial zooids with granular margins and small, triangular zooids at the distal end of normal zooids agrees with the morphological characteristics of C. reticulum. This is a cosmopolitan species in fouling communities (Orenzans et al, 2002) and it has been previously reported in benthic communities of the Bahía Blanca estuary (Bremec, 1989 Hosts. -N. granulata and C. angulatus.…”

Section: Resultssupporting

confidence: 54%

Parasites and Epibionts of Grapsid Crabs in Bahía Blanca Estuary, Argentina

Alda¹,

Sala²,

Marcotegui³

et al. 2011

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Epibionts and parasites were recovered from the grapsid crabs Cyrtograpsus angulatus and Neohelice granulata in the Bahía Blanca estuary, Argentina. Among epibionts, we identified a filamentous bacterium, the protozoan Epistylis sp., and the copepod Neocancrincola platensis on the gills; and the barnacles Balanus amphitrite and Balanus glandula as well as the bryozoan Conopeum reticulum on the caparace. Among endoparasites, we identified the acanthocephalan Profilicollis chasmagnathi in the hindgut, nematodes of the subfamily Acuariinae and Ascarophis sp. in the haemocoel, and an encysted cyclophyllidean cestode in the gut wall. Among microphallid digeneans, we found four metacercariae: Maritrema bonaerensis in the gills, muscle, haemocoel, and gonads, Maritrema orensensis in the gills, Levinseniella cruzi in the gonads, and Odhneria sp. in the muscle. Except for P. chasmagnathi, N. platensis, and M. bonaerensis, all other epibionts and digeneans represent new host records. This paper also presents novel information regarding the possible sites of infection for M. bonaerensis. Our results add relevant data about possible life cycles of helminths in the study area. RESUMENSe recuperaron epibiontes y parásitos de los cangrejos grápsidos Cyrtograpsus angulatus y Neohelice granulata en el estuario de Bahía Blanca, Argentina. Entre los epibiontes, se identificaron una bacteria filamentosa, el protozoo Epistylis sp. y el copépodo Neocancrincola platensis en las branquias, y los cirripedios Balanus amphitrite y Balanus glandula y el briozoo Conopeum reticulum en el caparazón. Entre los endoparásitos, se identificaron el acantocéfalo Profilicollis chasmagnathi en el intestino posterior, los nematodes Acuariinae y Ascarophis sp. en el hemocele y un cestode cyclophyllideo en la pared intestinal. Entre los digeneos microphallidos, se encontraron cuatro metacercarias: Maritrema bonaerensis en las branquias, el músculo, el hemocele y las gónadas, Maritrema orensensis en las branquias, Levinseniella cruzi en las gónadas y Odhneria sp. en el músculo. Excepto por P. chasmagnathi, N. platensis y M. bonaerensis, todos los otros epibiontes y digeneos representan nuevos registros para los hospedadores. Además, este trabajo presenta nuevos 1 )

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Section: Resultssupporting

confidence: 54%

Parasites and Epibionts of Grapsid Crabs in Bahía Blanca Estuary, Argentina

Alda¹,

Sala²,

Marcotegui³

et al. 2011

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“…In addition to the systematic bibliography, distribution records of bryozoan species scattered over the ecological literature (López Gappa et al, 1982;Bremec, 1986Bremec, , 1989Bremec, , 1990Roux et al, 1988;López Gappa, 1989) were also included in the database. Records involving unprecise localities (i.e.…”

Section: Methodsmentioning

confidence: 99%

“…Species are listed according to current taxonomic classifications or under the names appearing in the last revision or systematic paper in which they were studied. In addition to the systematic bibliography, distribution records of bryozoan species scattered over the ecological literature (López Gappa et al, 1982;Bremec, 1986Bremec, , 1989Bremec, , 1990Roux et al, 1988;López Gappa, 1989) were also included in the database.…”

Section: Methodsmentioning

confidence: 99%

Species richness of marine Bryozoa in the continental shelf and slope off Argentina (south‐west Atlantic)

Gappa

2000

Diversity and Distributions

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A total of 246 marine bryozoan species was recorded within an area of the southwest Atlantic between 35° and 56°S, and between the coast of Argentina and 50°W. The distribution pattern of benthic stations surveyed during the most important cruises in the area shows that the sampling effort has been biased towards southern shelf areas off Santa Cruz and Tierra del Fuego, as well as around the Malvinas (Falkland) islands. The littoral zone, Patagonian gulfs and the continental shelf off Chubut, Río Negro and Buenos Aires state received less attention, and should be surveyed more intensively in the future. Only 2% of the species can be regarded as non-indigenous, all of them inhabiting biofouling communities in harbour environments. With the exception of some thoroughly surveyed localities, the number of species recorded for different areas of the coast, shelf and slope is estimated to be just a small fraction of the actual number of species present. A distinct diversity gradient was found, with species-rich stations located only in the southern shelf. Highest diversity occurred in shelf areas dominated by coarse sediments, and along a high-productivity shelf-break front. A remarkable decrease in species richness was found in inner and middle shelf areas off Chubut, Río Negro and Buenos Aires state. This pattern may be related to the Pacific origin of the Magellanic fauna, since the diversity of bryozoans is higher in the Pacific than in the Atlantic Ocean. The trend of species richness is, however, overemphasized by the fact that the least diverse faunistic assemblage occurs in areas where surveys have been relatively less frequent. An up-todate checklist of species recorded for the study area is included.

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