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Medientyp:
E-Artikel
Titel:
Ballooning Methodology: Equations for Estimating Masses of Sticky-Trapped Spiders
Beteiligte:
Greenstone, Matthew H.;
Morgan, Clyde E.;
Hultsch, Anne-Lise
Erschienen:
American Arachnological Society, 1985
Erschienen in:The Journal of Arachnology
Sprache:
Englisch
ISSN:
1937-2396;
0161-8202
Entstehung:
Anmerkungen:
Beschreibung:
<p>Most empirical studies of spider ballooning use sticky traps to sample the aeronaut fauna. Once the animals are removed from the adhesive and passed through solvents into preservative, biologically meaningful masses cannot be determined directly. We use simple linear regressions to describe relationships between live masses of wild-caught animals and a volume estimate which treats the spider as a cylindrical solid with diameter equal to the mean of greatest carapace and abdomen width and height equal to total length. Of regressions for six families studied in detail, the slope for tetragnathids differs significantly from those for all but one of the other five. Pair-wise comparisons of slopes for the five non-tetragnathid families show no statistically significant differences. We therefore present two linear regression equations, one for tetragnathids and other similar-shaped spiders, and the other for "typical" (all other) spiders. Limited data from one species each of pisaurid and linyphiid are statistically indistinguishable from the "typical" regression but highly significantly different from the tetragnathid regression, lending added support to a dichotomy in shape between tetragnathids and other spiders. Simple linear regressions of mass on the volume estimate tend to explain more of the variation in mass than traditional power functions of mass on measurements of single body dimensions.</p>