| Registro completo |
| Provedor de dados: |
OMA
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| País: |
Belgium
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| Título: |
Size and phytoplankton selection by Oosterschelde zooplankton
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| Autores: |
Tackx, M.L.M.
Bakker, C.
Francke, J.W.
Vink, M.
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| Data: |
1989
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| Ano: |
1989
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| Palavras-chave: |
Zooplankton ANE
Netherlands
Oosterschelde
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| Resumo: |
Grazing of adults of the copepods <i>Acartia</i> spp., <i>Temora longicornis, Centropages hamatus</i> and nauplii of <i>Balanus</i> spp. on natural particulate matter from the Oosterschelde was studied using a Coulter counter. Two types of particulate matter distributions were found to occur in the Oosterschelde: 1. distributions with distinct peaks in the >20 µm size range (A) and 2. more flattened distributions which were bell-shapened or contained multiple small peaks spread over the entire 4-100 µm size range (B). In A-type distributions, peak tracking was performed in all species studied, especially in <i>Acartia</i> spp. and <i>T. longicornis</i>. In B-type distributions, the animals tended to spread their grazing activity towards the smaller particles. Quantitative microscopial analysis of the phytoplankton distributions shows that A- and B-type distributions were caused by the presence (A) or absence (B) of blooms of phytoplankton species with an SED of >20 µm, reaching concentrations of >1,40·10<sup>6</sup> µm³·cm<sup>-3</sup>. The demonstrated clearance rate distributions are shown to result in a concentration of phytoplankton in the ingested material as compared to the medium for all copepod species studied. <i>Balanus</i> spp. nauplii did not demonstrate this systematic selection of phytoplankton. When B-distributions occurred, only <i>Acartia</i> spp. switched its feeding activity towards smaller particles to such a degree that a substantial contribution of the <20 µm size range to the ingested material resulted. Whether this behaviour represents a higher selection capacity for small phytoplankton species or a detritivorous behaviour remains an open question.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3190
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| Fonte: |
%3Ci%3ENeth.+J.+Sea+Res.+23%281%29%3C%2Fi%3E%3A+35-43
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| Direitos: |
info:eu-repo/semantics/restrictedAccess
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