Hand-Rearing of Twin Gray Seals (Halichoerus grypus) from Birth to Weaning
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چکیده
منابع مشابه
Gas exchange of captive freely diving grey seals (Halichoerus grypus).
When at sea, phocids dive for long periods and spend a high percentage of their time submerged. This behaviour requires some combination of an increased oxygen storage capacity, rapid oxygen loading at the surface and reduced oxygen utilisation when submerged. To assess these adaptations, breath-by-breath ventilation was studied in four adult grey seals (two male, two female, 160-250 kg), freel...
متن کاملGRAY SEAL (Halichoerus grypus): Western North Atlantic Stock
STOCK DEFINITION AND GEOGRAPHIC RANGE The gray seal is found on both sides of the North Atlantic, with three major populations: eastern Canada, northwestern Europe and the Baltic Sea (Katona et al. 1993). The western North Atlantic population occurs from New England to Labrador and is centered in the Sable Island region of Nova Scotia (Mansfield 1966; Katona et al. 1993; Davies 1957; Lesage and...
متن کاملCan a gray seal (Halichoerus grypus) generalize call classes?
Past researchers have found that gray seals (Halichoerus grypus) are capable of classifying vocal signals by call type using a trained set, but were unable to generalize to novel exemplars (Shapiro, Slater, & Janik, 2004). Given the importance of auditory categorization in communication, it would be surprising if the animals were unable to generalize acoustically similar calls into classes. Her...
متن کاملIn-Air Evoked Potential Audiometry of Grey Seals (Halichoerus grypus) from the North and Baltic Seas
In-air anthropogenic sound has the potential to affect grey seal (Halichoerus grypus) behaviour and interfere with acoustic communication. In this study, a new method was used to deliver acoustic signals to grey seals as part of an in-air hearing assessment. Using in-ear headphones with adapted ear inserts allowed for the measurement of auditory brainstem responses (ABR) on sedated grey seals e...
متن کاملA novel mobile approach to investigating mating tactics in male grey seals (Halichoerus grypus)
Studies of the grey seal Halichoerus grypus mating system, using focal animal sampling constrained by study site location and size, limit the measurement of variation in male mating tactics and success. Using this method, the mating tactics of grey seal males have been classi®ed as either `tenured' or `transient'. Preliminary evidence is presented of wider variation in male mating tactics and s...
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ژورنال
عنوان ژورنال: Marine Ecology Progress Series
سال: 1982
ISSN: 0171-8630,1616-1599
DOI: 10.3354/meps009181