The Natural History of Weasels and Stoats: Ecology, by Carolyn M. King, Roger A. Powell, Consie Powell

By Carolyn M. King, Roger A. Powell, Consie Powell

Box naturalists have saw the actions of weasels for hundreds of years. Their descriptions have been frequently actual yet occasionally misinterpreted the animals' behaviors and underlying causes for these behaviors. "Organized common heritage" turned one of many roots of the technology of ecology within the Twenties and via the Sixties scientists had began to check the biology of weasels with all of the serious, goal benefits of recent conception and kit. until eventually the 1st variation of this e-book seemed in 1989 nobody had tried to give an explanation for those effects to non-specialist naturalists. Now completely revised, this booklet will stay the most one-stop reference for execs. yet either different types of wisdom are introduced jointly here-- observations for the normal naturalist and rigorous measurements and interpretations for contemporary scientists, built-in right into a unmarried, readable account.

This re-creation presents a entire precis of the huge advances over the past 15 years in our wisdom of those interesting animals. a brand new U.S.-based co-author reshapes the content material to be extra U.S.-centric. tales approximately North the United States trappers and backwoodsmen interacting with weasels exchange a few (not all) of the former tales approximately English gamekeepers. those adjustments permeate the ebook, so readers accustomed to the 1st variation will realize a few fabric, yet will discover a lot that's new. less trustworthy eu details quoted within the first variation used to be there on the time while no higher info was once to be had. Now a brand new NZ bankruptcy makes a speciality of predation difficulties of the species brought to that nation. This variation, even more than an easy replace, is now really a global therapy and a extra precious resource.

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Additional resources for The Natural History of Weasels and Stoats: Ecology, Behavior, and Management

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The joint between the lower jaw and the skull is cylindrical, and flanges from the skull wrap around the mandibular condyle on the lower jaw to prevent any sideways motion or dislocation of the jaw. Sideways movement would make the carnassials ineffective, like scissors held together with a loose screw. 5 Because the carnassial teeth are at the back of the jaw, weasels always chew muscle, sinew, and bones at the corner of the mouth. Hair-Trigger Mouse Traps with Teeth | 39 on the coronoid process, causing the jaw to rotate around the jaw joint and creating torque (Biknevicius & van Valkenburgh 1996).

The alert, rapid movements of weasels reflect their constant hunger, gearedup metabolism, and galloping pulse—measured at rest at about 360 to 390 beats per minute in stoats and 400 to 500 beats per minute in common weasels (Tumanov & Levin 1974; Segal 1975). If you put your ear to the chest of an anesthetized weasel, you can hear the heart “purr-r-r-ring” away, but you cannot count the heartbeats. This frantic pace of life is also reflected in the anatomy of organs that have to do with metabolic processes.

For both species, there is evidence of two routes of migration from the south, one inland and one along the west coast, plus a separate migration from Beringia in the north. The differences between contemporary populations of stoats in northwestern North America do appear to reflect these different origins and routes of recolonization. By contrast, genetic differentiation among the stoats of the Palaearctic appears to be relatively low (Kurose et al. 2005). Not only is genetic evidence strong for at least three quite separate lineages of stoats now living in the Alexander Archipelago, but also there are morphological differences visible even between adjacent populations elsewhere in the Northwest.

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