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Vertical Distribution of Invertebrates in Bed Sediments of a Gravel Stream in the Czech Republic

✍ Scribed by Marie Omesová; Jan Helešic

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
125 KB
Volume
92
Category
Article
ISSN
1434-2944

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✦ Synopsis

Abstract

The vertical distribution of invertebrates in bed sediments was studied in a gravel stream in the hercynian region of Central Europe, using freeze‐cores to the depth of 70 cm at two sites with different flow conditions, taken on five occasions. About 78% of invertebrates were concentrated in the upper 20 cm layer. The invertebrate communities at the two sites varied in abundance, diversity, vertical distribution and stability of vertical distribution with time. Densities of invertebrates were not limited by fine grain content and showed a site‐specific relationship with organic carbon content. Depth optima of invertebrates were negatively correlated with surface water temperature, but not with measured hydraulic parameters. Among individual taxa, Nematoda showed the deepest depth optimum. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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