Download e-book for kindle: A Field Guide to Pacific Coast Fishes: North America by Eugene H. Kaplan, Roger Tory Peterson, Susan L. Kaplan

By Eugene H. Kaplan, Roger Tory Peterson, Susan L. Kaplan

ISBN-10: 0618002111

ISBN-13: 9780618002115

Greater than six hundred species are defined intimately, with greater than 525 illustrations. this is often the consultant for speedy, trustworthy identity of fishes that youll come upon whereas fishing, snorkeling, diving, or perhaps walking alongside a Pacific Coast seashore.

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Extra info for A Field Guide to Pacific Coast Fishes: North America

Sample text

_... - 43 _ I I I _ • • ••• • -.... •• II • • I • • II ... :. ••••31 0 24 6 12 Time (h) 18 Fig. 26. Activity of two individual A, schmidti in aktograph apparatus under different lighting and thermal regimes. Above In L:D/12: 12 with fluctuating temperature (days 1-5); LL (constant light) with fluctuating temperature (12 h at 16°C, 12 h at 31°C; days 6-16); LL at 31°C (days 17-20). Below In LL with fluctuating temperature (days 1-10); LL at 31°C (days 11-16); L:D/18:8 at 31°C (days 17-24) (Constantinou and Cloudsley-Thompson 1985) Tiliqua scincoides shows no diel variation in basic heart rate, which is inversely related to body weight, but resting lizards have lower heart rates in constant darkness than they do when maintained in constant light (Firth et al.

In many cases, extreme daytime heat is avoided but, just as in the case of Thermophilum sexmaculatum, the winter cold at night may present a greater problem than the midday summer heat. For example, in southern Texas, desert tortoises, Gopherus berlandieri (Testudinidae), have two activity periods, morning and late afternoon in summer: they are inactive around midday. They are also inactive from December to February inclusive (Rose and Judd 1975). Likewise, the African Geochelone sulcata (Fig. 12b) is mainly active early and late in the day.

1974). The thermal significance of burrowing deeply is well illustrated by the work of Hadley (l970b) who measured the daily temperature sequences at various levels above and below an open desert surface in Arizona, as well as the burrow temperatures experienced by free-ranging scorpions (Hadrurus arizonensis; Fig. 17). Although the soil surface temperature fluctuated 46 DC over a 24-h period, the burrow temperature variations, some 20 cm below, did not exceed 10 DC. Comparable results have been obtained by Shorthouse and Marples (1980) in their study of burrowing behaviour in the Australian arid zone scorpion Urodacus yaschenkoi.

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A Field Guide to Pacific Coast Fishes: North America by Eugene H. Kaplan, Roger Tory Peterson, Susan L. Kaplan

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