3/4/2003 · MATERIAL AND METHODS SOREX SHREWS. Sorex shrews are predators of invertebrates, with high energy demands and year-round activity (Churchfield, 1990).Body mass of weaned shrews does not change much throughout the summer, there is a marked mass decrease in winter (the Dehnel Effect), and a great spurt of growth in spring as animals put on weight and achieve #ual maturity.
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According to Bergmann’s rule, individuals of a given species tend to be larger in colder (northern) climates. Traditional explanation points to the relatively lower surface-to-volume ratio in …