Zooplankton assemblages from a tidal channel in the Bahía Blanca Estuary, Argentina
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 emphas...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Universidade de São Paulo
2007-06-01
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| Series: | Brazilian Journal of Oceanography |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592007000200003 |
| _version_ | 1829106568323399680 |
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| author | Mónica Susana Hoffmeyer María Sonia Barría de Cao |
| author_facet | Mónica Susana Hoffmeyer María Sonia Barría de Cao |
| author_sort | Mónica Susana Hoffmeyer |
| collection | DOAJ |
| description | 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.<br>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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| issn | 1679-8759 1982-436X |
| language | English |
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| series | Brazilian Journal of Oceanography |
| spelling | doaj.art-3bf245ae06ca433ca86062e0f5d2cba72022-12-22T00:34:47ZengUniversidade de São PauloBrazilian Journal of Oceanography1679-87591982-436X2007-06-015529710710.1590/S1679-87592007000200003Zooplankton assemblages from a tidal channel in the Bahía Blanca Estuary, ArgentinaMónica Susana HoffmeyerMaría Sonia Barría de CaoIn 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.<br>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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592007000200003Canal de maréMicrozooplânctonTintinnidaMesozooplânctonCopepodaMeroplânctonEstuárioVariação estacionalTidal channelMICROZOOPLANKTONTintinnidsMESOZOOPLANKTONCopepodsMeroplanktonEstuarySeasonal variation |
| spellingShingle | Mónica Susana Hoffmeyer María Sonia Barría de Cao Zooplankton assemblages from a tidal channel in the Bahía Blanca Estuary, Argentina Brazilian Journal of Oceanography Canal de maré Microzooplâncton Tintinnida Mesozooplâncton Copepoda Meroplâncton Estuário Variação estacional Tidal channel MICROZOOPLANKTON Tintinnids MESOZOOPLANKTON Copepods Meroplankton Estuary Seasonal variation |
| title | Zooplankton assemblages from a tidal channel in the Bahía Blanca Estuary, Argentina |
| title_full | Zooplankton assemblages from a tidal channel in the Bahía Blanca Estuary, Argentina |
| title_fullStr | Zooplankton assemblages from a tidal channel in the Bahía Blanca Estuary, Argentina |
| title_full_unstemmed | Zooplankton assemblages from a tidal channel in the Bahía Blanca Estuary, Argentina |
| title_short | Zooplankton assemblages from a tidal channel in the Bahía Blanca Estuary, Argentina |
| title_sort | zooplankton assemblages from a tidal channel in the bahia blanca estuary argentina |
| topic | Canal de maré Microzooplâncton Tintinnida Mesozooplâncton Copepoda Meroplâncton Estuário Variação estacional Tidal channel MICROZOOPLANKTON Tintinnids MESOZOOPLANKTON Copepods Meroplankton Estuary Seasonal variation |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592007000200003 |
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