By Peter Brookesmith
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Scholars frequently locate it tough to know primary ecological and evolutionary ideas as a result of their inherently mathematical nature. Likewise, the appliance of ecological and evolutionary conception usually calls for a excessive measure of mathematical competence.
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Extra resources for Creatures from Elsewhere: Weird Animals That No-One Can Explain
Photograph courtesy of F. G. Andrews (Hardy, 1971); with permission] 46 The Use of Light and Timing of Activity days and bimodal on hot days (Hamilton, 1971). Other genera in the Namib also have temporally predictable periodicities under natural conditions (Louw and Hamilton, 1972; Holm and Edney, 1973). S. exhibit similar patterns (Krehoff, 1975). No detailed tests of the separate effects of photoperiod and other abiotic factors seem to have been made, although Krehofrs work was done at a constant 26°C for 24 h under natural (window) illumination.
Dormant and/or soil-bound species such as Orthoporus millipedes may be examples of this category. , 1970). At the thermally "correct" time of year these and many other species may be particularly susceptible to a rainfall stimulus (see below). A more direct option is to be completely dependent on ambient moisture conditions. Desert nematodes are probably good examples of this alternative; they respond to decreasing soil moisture by undergoing anhydrobiosis (Freckman, 1978) (Fig. 11). Also, regional rainfall differences in the Sahara seem to correlate with the seasonal activities of certain geographically separated Fig.
Simple light-associated responses and diel periodicties are obviously not consistent among species of desert isopods. III. Arachnids Except for such arachnids as salticid and lycosid spiders (Fig. 3), which seize their prey after a quick run, most desert species in this order appear to have eyes that are more suited to detecting light-intensity changes than to perceiving objects. In some species not even light intensity seems to mean much. For example, the whipscorpion Mastigoproctus giganteus makes no 36 The Use of Light and Timing of Activity a b Fig.