Data/hora: 09/06/2024 00:38:36

Provedor de dados: | 27
País: | Belgium
Título: | Size and phytoplankton selection by Oosterschelde zooplankton
Autores: | Tackx, M.L.M.; Bakker, C.; Francke, J.W.; Vink, M.
Data: | 1989
Ano: | 1989
Palavras-chave: | Zooplankton ANE; Netherlands; Oosterschelde.
Resumo: | Grazing of adults of the copepods &lt;i&gt;Acartia&lt;/i&gt; spp., &lt;i&gt;Temora longicornis, Centropages hamatus&lt;/i&gt; and nauplii of &lt;i&gt;Balanus&lt;/i&gt; 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 &gt;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 &lt;i&gt;Acartia&lt;/i&gt; spp. and &lt;i&gt;T. longicornis&lt;/i&gt;. 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 &gt;20 µm, reaching concentrations of &gt;1,40·10&lt;sup&gt;6&lt;/sup&gt; µm³·cm&lt;sup&gt;-3&lt;/sup&gt;. 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. &lt;i&gt;Balanus&lt;/i&gt; spp. nauplii did not demonstrate this systematic selection of phytoplankton. When B-distributions occurred, only &lt;i&gt;Acartia&lt;/i&gt; spp. switched its feeding activity towards smaller particles to such a degree that a substantial contribution of the &lt;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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3190
Fonte: | %3Ci%3ENeth.+J.+Sea+Res.+23%281%29%3C%2Fi%3E%3A+35-43
Fonte: | info:eu-repo/semantics/restrictedAccess