Harp Seals: Monitors of Change in Differing Ecosystems
نویسندگان
چکیده
منابع مشابه
The Effects of Climate Change on Harp Seals (Pagophilus groenlandicus)
Harp seals (Pagophilus groenlandicus) have evolved life history strategies to exploit seasonal sea ice as a breeding platform. As such, individuals are prepared to deal with fluctuations in the quantity and quality of ice in their breeding areas. It remains unclear, however, how shifts in climate may affect seal populations. The present study assesses the effects of climate change on harp seals...
متن کاملDevelopment of aerobic and anaerobic metabolism in cardiac and skeletal muscles from harp and hooded seals.
In diving animals, skeletal muscle adaptations to extend underwater time despite selective vasoconstriction include elevated myoglobin (Mb) concentrations, high acid buffering ability (beta) and high aerobic and anaerobic enzyme activities. However, because cardiac muscle is perfused during dives, it may rely less heavily on Mb, beta and anaerobic pathways to support contractile activity. In ad...
متن کاملGiardia and Cryptosporidium in harp and hooded seals from the Gulf of St. Lawrence, Canada.
Giardia and Cryptosporidium are protozoan parasites known to cause enteric disease in terrestrial wildlife species (mammals, reptiles and birds). Few surveys for Giardia and Cryptosporidium in marine wildlife species, such as pinnipeds, have been reported. The objective of this study was to determine the prevalence and genotype of Giardia and Cryptosporidium in two species of pinnipeds, harp se...
متن کاملDo Monk Seals Exert Top-Down Pressure in Subphotic Ecosystems?
Patterns of subphotic fish assemblages on seamounts in the Northwestern Hawaiian Islands were identified and compared for potential structuring influences, including the bottom-up effects of regional oceanic productivity and top-down predation pressure exerted by visiting monk seals (Monachus schauinslandi). Patterns in fish size, density, and biomass were evaluated at the deep extreme (350–500...
متن کاملKinematics and estimated thrust production of swimming harp and ringed seals.
The propulsive motions of swimming harp seals (Phoca groenlandica Erxleben) and ringed seals (Phoca hispida Schreber) were studied by filming individuals in a flume. The seals swam at velocities ranging from 0.6 to 1.42 m s-1. Locomotion was accomplished with alternate lateral sweeps of the hind flippers generated by lateral flexions of the axial body in conjunction with flexion of the flippers...
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ژورنال
عنوان ژورنال: Frontiers in Marine Science
سال: 2020
ISSN: 2296-7745
DOI: 10.3389/fmars.2020.569258