ISSN:
1365-2427
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Sieving efficiency, defined as the percent increase in yield of numbers or biomass of organisms, obtained by use of a sieve with 0-25-mm mesh openings instead of a 0-50-mm meshed sieve, was investigated in a lotic habitat over a 12-month period. Greatest elficiencies obtained were 300 to 600% for mayflies, chironomids, simuliids, ‘other dipterans,’ water mites and plecopterans and 90 and 190% for trichopterans and coleopterans, respectively. For the fauna as a whole, efficiency varied from 95 to 325% over the study period.Efficiency in estimating biomass was not as great as that with numbers and generally was below 10% for trichopterans. mayflies, ‘other dipterans’, coleopterans and the fauna taken as a whole. For chironomids, simuliids and water mites efficiencies generally were higher than 10% and reached as high as 174%, 60% and 80%, respectively. In all groups efficiency varies throughout the year with lowest occurring during winter months.The findings are compared with data found in the literature and discussed in relation to structural, behavioural, and life history characters.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-2427.1974.tb00099.x
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