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vol.47 issue1-2Cangrejos braquiuros (Brachyura) del arrecife de Cabo Pulmo-Los Frailes y alrededores, Golfo de California, MéxicoDry mass estimation of tropical aquatic insects using different short-term preservation methods author indexsubject indexarticles search
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Revista de Biología Tropical

On-line version ISSN 0034-7744Print version ISSN 0034-7744

Abstract

CRESSA, Claudia. Dry mass estimates of some tropical aquatic insects. Rev. biol. trop [online]. 1999, vol.47, n.1-2, pp.133-141. ISSN 0034-7744.

Relationships of body mass and head capsule width were developed for Thraulodes sp., Haplohyphes sp. (Ephemeroptera), Leptonema sp., Phylloicus sp. Nectopsyche sp. (Trichoptera), and Anacroneuria sp. (Plecoptera). The organisms were collected with a Surber net (0.1296 m2 and 0.286 mm mesh size) on the Orituco river, Venezuela. The number of specimens used in the analysis for the species studied, was different (from 84 to 103 specimens). Regression analysis indicated that all relationships were best expressed by a power function rather than by linear or exponential equation. Analyses of the relationships reveal interspecific differences among insects of the same order. Species-specific relationships are recommended to be used whenever possible since, depending on the species, the underestimation of mass could be as much as 56%.

Keywords : Biomass; length-mass; relationships; aquatic insects; tropics.

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