Physical microhabitat requirements of freshwater pearl mussels,Margaritifera margaritifera (L.) |
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Authors: | Hastie Lee C Boon Philip J Young Mark R |
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Institution: | (1) Culterty Field Station, Newburgh, University of Aberdeen, Aberdeenshire, AB41 0AA, U.K.;(2) Scottish Natural Heritage, 2 Anderson Place, Edinburgh, EH6 5NP, U.K.;(3) Culterty Field Station, Newburgh, University of Aberdeen, Aberdeenshire, AB41 0AA, U.K. |
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Abstract: | Surface sediment diatoms from the east coast of Lake Tanganyika were analysed using ordination and classification techniques, and compared with assemblages previously described from the northern part of the lake. Grain-size analyses were performed on subsamples. Four groups of diatom assemblages were recognised. The first group clusters samples taken in the north, far from the Rusizi river mouth. The second group comprises samples taken on silty sediment along the Tanzanian coast, including one sample taken near the mouth of the Malagarazi river and those from the northernmost part of the lake. The third group comprises surface sediments along the Burundian coast (near Ramba and Magara), and the fourth is characterised by epipsammic taxa. A sample taken near the central arm of the Malagarazi river is included in the latter group. The impact of small rivers on the diatom assemblages in the surface sediments is restricted to the mouth area. |
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Keywords: | hydrology substrata mussel density spatial patterns |
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