Date of Award:
Doctor of Philosophy (PhD)
James A. MacMahon
James A. MacMahon
Loyd W. Bennett
B. K. Gilbert
Ronald V. Canfield
Ivan G. Palmbald
Spider community acceptance of, and segregation by, architectural configuration was investigated for the spiders of Green Canyon in northern Utah. Modular habitat units consisting of 30.48 centimeter (1 foot) cubes of chicken wire supporting internal strands of macrame jute tied in different orthogonal configurations were used. Configurations including all three axes were tested at two strand densities.
The primary null hypothesis tested, that spider species use structures independent of architecture, was rejected in favor of the alternate hypothesis that spider species differentially use structures dependent upon architecture. Of the eight most abundant species, two showed preferences for horizontal substrata and one chose vertical substrata. All spiders strongly responded to the amount of jute available in each module. The two most abundant jumping spiders were biased toward modules with widely spaced jute, while the two most abundant web-builders preferred closely spaced jute.
Of the eight most abundant species, two species fell within each of the following four hunting guilds: jumpers, ambushers, pursuers, and web-builders. Within each pair of species, juveniles of the larger species emerged earlier in each of the two field seasons studied. In three of the species pairs, the body lengths were sufficiently different to fulfill theoretical requirements for their coexistence based upon differential prey size use. The remaining species pair, ambushers, had sufficiently different cryptic coloration and abundance patterns to suggest that their coexistence was determined by a combination of microhabitat and seasonal separation.
Robinson, James Vincent, "The Effect of Architectural Variation in Habitat on a Spider Community: An Experimental Field Study -- with Special Reference to Resource Partitioning" (1978). All Graduate Theses and Dissertations. 8413.
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