Download Biology of Desert Invertebrates by Clifford S. Crawford Ph.D. (auth.) PDF

By Clifford S. Crawford Ph.D. (auth.)

What little we all know of the biology of wasteland invertebrates stems principally from inferences according to in depth and repeated observations. Such informa­ tion isn't really received simply, for the reason that regardless of the particular abundance of those animals, particularly few of them are ever obvious. actually, aside from species impacting at the health of human populations, traditionally such a lot were missed by means of students within the western global. certainly, it used to be historical Egypt, with its reverence for the symbolism of the scarab, that most likely supplied us with the clearest early list of sought after barren region varieties. A extra modest resurgence of the tale needed to wait till the coming of the current century. to make sure, a few of the extra visible species had through then been increased by way of eu creditors to the extent of drawing-room curios­ ities, and expeditions had back huge numbers to museums. yet by way of 1900 the duty of describing desolate tract species and relationships between them was once nonetheless in its infancy; and as for cautious normal historical past reports, they too have been simply entering their own.

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1977). Introduced earthworms occur in riparian habitats in the Great Basin desert (Gates, 1967). Although earthworms do not seem to be indigenous to warm deserts, the South African Microchaetus modestus, at 7 m the world's longest earthworm, inhabits sandy grassland soils; it resists desiccation more effectively than other terrestrial species (Sims, 1978). D. Gastropod Mollusks Easily overlooked because most enter subterranean dormancy, desert snails are represented by many species and families in southwestern North America (Bequaert and Miller, 1973).

While only about half a dozen families are actually found in deserts, their continental and local distributions are somewhat family-specific, except for the polar regions where none occur. Species populations in arid locations sometimes reach relatively high densities (Williams, 1970; Shorthouse, 1971; Polis and Farley, 1980). Faunal diversities may also be considerable in locations such as Baja California, where many kinds of habitats have resulted from a complex succession of geological events (Williams, 1980).

1977) and Antarctic (Wallwork, 1976) deserts. Desert archaeognaths and thysanurans are somewhat larger and more inclined to exploit the soil surface, although many are also found in soil, litter, and ant nests. They are known from deserts in the Sudan (Cloudsley-Thompson and Idris, 1964), southern Africa (Edney, 1971a), Central Asia (Kaplin, 1978), and North America (Wygodzinski, 1972). P. Cockroaches and Lesser Orthopteroid Insects Twenty-eight species of cockroaches are considered xerophyllic by Roth and Willis (1961).

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