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Relative abundance and growth of mussels mollusca eulamellibranchia in pools 8 9 and 10 of the mississippi river iowa usa



Relative abundance and growth of mussels mollusca eulamellibranchia in pools 8 9 and 10 of the mississippi river iowa usa



Freshwater Biology 7(3): 279-286



Unionid mussels (23 spp.) were sampled during the summer of 1975 from a 76-mile reach of the upper Mississippi River [Iowa, USA]; this represented 8 spp. fewer than were recorded in a 1930-31 survey for the same section of the river. Of the 244 sites sampled in 1975, mussels were found at 116 sites and the 10 most productive sites accounted for 40.8% of the 1205 mussels collected. There were as many as 13 mussel species taken from 1 sampling site. The 2 most abundant species (Amblema peruviana and Megalonaias gigantea) constituted 54.5% of the mussels sampled in 1975; these 2 spp. made up only 8.3% of the 1930-31 survey. Individuals of the 12 most abundant mussel species were aged, and shell-length growth equations were determined. Shell-free dry weight growth rate and shell weight growth rate was determined for A. peruviana. The calculated annual production for A. peruviana (assuming a mean density of 1/m2) was 482 mg/m2 shell-free dry weight, and 14.471 g/m2 shell weight.

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