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B.BELTMAN and W. RI ETVELD (Dept. of Landscape Ecology and Nature Management, State University of Utrecht, Opaalweg 20, Utrecht, the Netherlands). INTRODUCTION During the last five years a considerable amount of research has been done on macrofauna larger than 0.5mm (excluding amphibians and fish) in ditches. One of the aims of these investigations is to obtain insight into the functioning of aquatic communities, i.e. information about producers (macrophytes, phytoplankton), consumers (zooplankton, macrofauna) and reducers (bacteria, fungi). The results will be used to achieve integrated water quality management. Ditches are important elements in the Dutch landscape and the research on their macrofauna communities can be divided in (1) studies of the relation between macrofauna and for instance pollution, vegetation or nutrients, and (2) inventorying sampling by local and county authorities. 100' 12345 ~ 2 3 4 5 2345 12345 123.45 a b c d e Number of taxa per sampling method, expressed as a percentage of the total number Fig. 1. of taxa found in all samples combined. a - e = 5 different ditches; 1 = 10m., standard net; 2 = 2m., standard net; 3 = 5m., standard net; 4 = bottomless cage; 5 = substrate sample. (On the
Aquatic Ecology – Springer Journals
Published: Nov 3, 2005
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