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Sieve efficiency in benthic sampling as related to chironomid head capsule width

Journal of the Kansas Entomological Society

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Abstract

The width of the head capsule in chironomid larvae is the most important morphometric character controlling retention of specimens in sieving devices. Knowledge of the range in size of these widths within any chironomid community is fundamental to sampling and interpreting the resulting data. We present the head capsule widths of 30 species of chironomids and relate their size distribution to loss or retention in several experiments using graded sieve sizes. Based on our measurements and those found in the literature we found the head capsule width of fourth instars in half the chironomids species to be less than 350 I?m. Many species may never be collected with the commonly used U.S. Standard No. 30 sieve (589 I?m), and the No. 60 (246 I?m) screen appears to retain most species only qualitatively. We found 70 to 90% of the chironomid larvae and 19 to 34% of their biomass can pass through a No. 80 sieve (177 I?m). The implications of sieve loss and other factors affecting sieving efficiency are discussed.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Sieve efficiency in benthic sampling as related to chironomid head capsule width
Series title:
Journal of the Kansas Entomological Society
Volume
71
Issue:
4
Year Published:
1998
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 456-468
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of the Kansas Entomological Society
First page:
456
Last page:
468
Number of Pages:
12