Abundance and species composition of Tintinnina (ciliophora) in Bahía Blanca estuary, Argentina

Cao, María Sonia Barría de

doi:10.1016/s0272-7714(05)80085-x

Cited by 29 publications

(14 citation statements)

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“…2) and were coincident with the highest temperatures, which is in agreement with the results obtained in previous works carried out in the inner part of the estuary (Barría de Cao, 1992), where peaks in abundance due to the presence of Tindinnidium balechi are common. The maximum abundance peak, however, corresponded to M. mereschkowskyi, a species typical of the outer part of the estuary.…”

Section: Discussionsupporting

confidence: 92%

“…The low density of tintinnids observed during the winter in this area is coincident with the results obtained in the inner part of the estuary (Barría de Cao, 1992). This can be explained by the dominance of thread-bearing diatoms during the phytoplankton bloom occurring annually in the estuary which in general, are not adequate food for tintinnids .…”

Section: Discussionsupporting

confidence: 83%

“…The species richness of tintinnids found in the area was slightly lower than that registered in the Main channel (19) (Barría de Cao, 1992). The maximum was recorded at C. Most of the tintinnid species observed in this study have been reported before for the inner part of the estuary (Barría de Cao, 1992), though some of them, such as Favella taraikaensis, Eutintinnus lususundae and M. mereschkovskyi, are typical of the outer zone of the estuary which has more marine influence than the inner shelf (Barría de Cao, 1986).…”

Section: Discussioncontrasting

confidence: 55%

“…Correlations and ANOVA were calculated using log transformed data (Nº ind m -3 + 1). The results obtained on mean abundance and seasonality of micro and mesozooplantkon for this tidal channel were compared with those reported by Barría de Cao (1992) and Hoffmeyer (2004) for the Main channel.…”

Section: Methodsmentioning

confidence: 81%

“…Particular emphasis is placed on tintinnids, the main group within the microzooplankton, and on copepods and meroplankton, the two major groups among the mesozooplankton in the Bahía Blanca estuary (Barría de Cao, 1992;Hoffmeyer, 1983;2004 a, b). The zooplankton characteristics found at this tidal channel are compared with those observed in previous years at Ing.…”

Section: Introductionmentioning

confidence: 99%

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Zooplankton assemblages from a tidal channel in the Bahía Blanca Estuary, Argentina

Hoffmeyer

Cao

2007

Braz. j. oceanogr.

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In this study we investigate for the first time the zooplankton assemblages in a relatively small tidal channel called Bahía del Medio, situated in the middle-outer area of the Bahía Blanca Estuary, South of the Main channel. We focused the study on micro- and mesozooplankton assemblages with emphasis on tintinnids, copepods and meroplankton along the annual cycle 1997-1998. Fifteen species of tintinnids belonging to 6 genera were observed in the study area, the mean total tintinnid abundance fluctuating between 3.4 x 10(6) ind. m-3 and 5.1 x 10(6) ind m-3. The mesozooplankton comprised 11 taxa, total abundance fluctuating between 449 ind m-3 in March 1997 and only 1 ind m-3 in October 1997. The channel proved to be spatially homogeneous in its physical and biochemical features. Micro- and mesozooplankton abundance displayed a high degree of spatial homogeneity, though the seasonal variation in both environment and zooplankton was significant. Comparison with the zooplankton observed at a station in the Main channel of the estuary showed differences in number of taxa represented, a general lower abundance of both assemblages and the presence of some rare species, a fact which is discussed.
Neste estudo pesquisamos pela primeira vez as associações do zooplâncton num pequeno canal de maré, relativamente novo e chamado Bahía del Medio, localizado na região média-exterior do estuário da Bahía Blanca e ao sul do canal principal. Focalizamos o estudo no micro- e mesozooplâncton com ênfase nos grupos Tintinnida, Copepoda e meroplâncton, ao longo do ciclo anual 1997-1998. Foram observadas 15 espécies de Tintinnida pertencentes a 6 gêneros; a abundância média total de Tintinnida variou entre 3,4 x 10(6) ind. m-3 e 5,1 x 10(6) ind. m-3. O mesozooplâncton apresentou 11 taxa e uma abundância total entre 449 ind. m-3 em março de1997 e 1 ind. m-3 em outubro de 1997. O canal provou ser espacialmente homogêneo em suas características biológicas, químicas e físicas. A abundância do micro- e mesozooplâncton mostrou um alto grau de homogeneidade espacial, embora a variaçao estacional fosse significativa nas características do meio ambiente e do zooplâncton. A comparação com o zooplâncton observado em uma estação de amostragem no canal principal do estuário mostrou diferenças no número de taxa, na abundância, em geral mais baixa, e na presença de algumas espécies raras , fato esse comentado

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 83%