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Medientyp:
E-Artikel
Titel:
Ballooning Mygalomorphs: Estimates of the Masses of Sphodros and Ummidia Ballooners (Araneae: Atypidae, Ctenizidae)
Beteiligte:
Coyle, Frederick A.;
Greenstone, Matthew H.;
Hultsch, Anne-Lise;
Morgan, Clyde E.
Erschienen:
American Arachnological Society, 1985
Erschienen in:The Journal of Arachnology
Sprache:
Englisch
ISSN:
0161-8202;
1937-2396
Entstehung:
Anmerkungen:
Beschreibung:
<p>The masses of Sphodros atlanticus and Ummidia sp. spiderlings capable of ballooning, and of Antrodiaetus unicolor spiderlings believed not to balloon, were estimated by means of a volume-mass regression developed with data from five araneomorph families, and compared with the mass frequency distribution of a sample of 216 aerially dispersing araneomorphs trapped over a one week period in a soybean field. Mean estimated masses of the Sphodros and Ummidia spiderlings were 1.25 mg and 3.45 mg, respectively. Although these were in at least the 95th percentile of masses of the trapped araneomorphs, larger araneomorphs were trapped. These results and the finding that A. unicolor spiderlings were intermediate in estimated mass (mean = 2.02 mg) between S. atlanticus and Ummidia, indicate that mass is not the only constraint on ballooning behavior in mygalomorphs. Habitats of the three species support the habitat predictability hypothesis of ballooning, A. unicolor tending to be found in more predictable habitats than the other two species. Live mass measurements of ballooning Ummidia spiderlings indicate that the volume-mass regression estimates of mygalomorph spiderling masses are consistently slightly high. This may be due to tissue density differences between araneomorphs and mygalomorphs.</p>