منابع مشابه
Brightness discrimination in the harbor seal (Phoca vitulina)
The brightness discrimination ability of a male harbor seal was investigated at an ambient illumination of 0.9lx. The visual stimuli consisted of circular gray discs that were presented on a black background on a TFT monitor. Eight standard intensities were tested against sets of lower comparison intensities. In accordance with Weber's law we observed a constant gain of the just noticeable inte...
متن کاملThermoregulatory responses to altering hypothalamic temperature in the harbor seal.
The rostral brainstem of the harbor seal Phoca vitulina was cooled and heated 33-41 degrees C while oxygen consumption and rectal, hypothalamic, flipper and dorsal skin temperatures were measured. These experiments were made on restrained seals at ambient temperatures -15 to 30 degrees C. Cooling the preoptic and hypothalamic (POH) tissue increased oxygen consumption in a way that could be appr...
متن کاملHARBOR SEAL (Phoca vitulina): Western North Atlantic Stock 2009
STOCK DEFINITION AND GEOGRAPHIC RANGE The harbor seal is found in all nearshore waters of the Atlantic Ocean and adjoining seas north of 30oN (Katona et al. 1993). In the western North Atlantic, they are distributed from the eastern Canadian Arctic and Greenland south to southern New England and New York, and occasionally to the Carolinas (Mansfield 1967; Boulva and McLaren 1979; Katona et al. ...
متن کاملHARBOR SEAL (Phoca vitulina): Western North Atlantic Stock
STOCK DEFINITION AND GEOGRAPHIC RANGE The harbor seal is found in the western North Atlantic, from the eastern Canadian Arctic and Greenland south to southern New England and New York, and occasionally to the Carolinas (Boulva and McLaren 1979; Katona et al. 1993; Gilbert and Guldager 1998). Although the stock structure of the western North Atlantic population is unknown, it is thought that har...
متن کاملFine-Scale Variability in Harbor Seal Foraging Behavior
Understanding the variability of foraging behavior within a population of predators is important for determining their role in the ecosystem and how they may respond to future ecosystem changes. However, such variability has seldom been studied in harbor seals on a fine spatial scale (<30 km). We used a combination of standard and Bayesian generalized linear mixed models to explore how environm...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1889
ISSN: 0036-8733
DOI: 10.1038/scientificamerican01121889-10859supp