Download Energetics of Desert Invertebrates by Harold Heatwole PDF

By Harold Heatwole

Desert invertebrates reside in an atmosphere the place assets exchange unpredictably among short classes of lots and lengthy shortage. This publication describes the adaptive concepts of wilderness invertebrates in buying strength and maintaining lifestyles lower than such vicissitudes. a few cooperate in foraging; others compete for assets. a few are nomadic and migrate to extra favorable websites as stipulations swap. Others preserve strength through going right into a deep dormancy until eventually larger stipulations go back. nonetheless others shop nutrition in the course of lots and retreat underground in the course of much less favorable times.
The adaptive modes of husbanding scarce strength assets are different and bring about an appreciation of the elaborate interactions of animals residing close to their environmental limits.

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Extra resources for Energetics of Desert Invertebrates

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Solid figures indicate ants leaving nest, broken ones ants returning with food and open figures those returning without food. Length of bars is in proportion to percentage of ants foraging in the indicated direction. (After Wehner et al. 1983) The desert gardening ant, Acromyrmex versicolor, follows trails, of which the portions proximal to the nest are permanent but the distal parts change direction as different individual plants are harvested (Gamboa 1975). 5 Factors Influencing Foraging Intensity of foraging in desert regions varies markedly over several time scales.

The Kalahari has an abundance of termites (Werger 1986) and the Australian arid regions seem to have an unusually high representation both of ants and termites (but see Greenslade 1975, for an exception). Smith and Morton (1990) suggested that the low fertility of Australian soils results in poor quality of plant forage, with nutrient levels being too low for most herbivores to use. Consequently much of plant production goes directly into the detrivorous pathway. This food source is dominated by termites because they have cellulose-digesting symbionts in the gut (see Chap.

Within a species there was sometimes year-to-year variation in pattern of seasonal activity that reflected longterm changes in precipitation and productivity (Whitford 1978a,c). Few, if any, species forage with equal intensity over the entire diel period. Most exhibit cyclic behaviour, alternating periods of activity with periods of rest, or at least show fluctuations in activity level, interspersing activity peaks with times of relative quiescence. Many species fall into one of two categories, either diurnal (day-active) (Fig.

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