Individual animals appear to exhibit highly specialized feeding habits in many cases (e.g., Hueckstaedt et al. One of the best-studied foraging patterns among pinnipeds is that of the elephant seals. 2012; Maxwell et al. REPRODUCTION, Site designed by Valerie Lind for Organismal Biology at the
Harp seal hearing is also adapted to function both in air and under water. These northern areas are regions of high primary productivity, which contain abundant fish and squid. #sealday2015. They are used as a site of
Harp seals appear to have a promiscuous breeding system. They lower their heart rate by 90%; supplying
Pre-World War II hunting was done for oil and leather, but improved techniques for handling furs meant that the blueback pelt became the most financially lucrative product of the hooded seal harvest. When ashore for breeding or for molting, adult elephant seals fast (see Chapter 13), and each fasting period is followed by a prolonged period of foraging in offshore waters. membrane that covers the eyes to protect them from the harsh
however
mobile. Similar to that of a camel, harp seals also have a
Among northern elephant seals, females tend to begin breeding at age 3 or 4. J. Chris McKnight, Ian L. Boyd, in Encyclopedia of Marine Mammals (Third Edition), 2018. Consequently, the mean age at sexual maturity in a population may simply be a reflection of the mean growth rate. consumer with high quality nutrients. With the advances in biotelemetric tracking technologies (i.e., multisensor satellite-linked tags, including CTD-SRDLs—conductivity, temperature depth Satellite Relay Data Loggers; also see Chapter 10 and Section 14.3.2 of Chapter 14), details of the foraging behavior and foraging habitat(s) of these deep-diving seals have been documented. This layer of fat also
It takes far less energy to move without the extra
This is because they need to be able navigate their ways through large bodies of water. In some areas where marine mammals are hunted, comparisons have been made between the value of tourism vs hunting. They also have lenses which help them to focus on objects more clearly. Harbor seal sites in the glacier fjords of Alaska have experienced a ten fold increase in tour-ship visitation since the 1980s (Jansen et al., 2015). would. Additionally, jaw sensor detectors and animal-borne cameras have contributed to understanding foraging behavior of these animals (Naito et al. of the lack of lactic acid in their muscles as other animals
warm. The lack of a pinna in “earless” seals, like the harp seal, and the presence of a long ear canal partially plugged with wax, may reduce hearing capacity in air. on land; when replacing their skin there is a compromise to how
Interestingly enough, in order to deal with the intense glare of
Figure 4. the same redirect of blood flow that allows them to remain
Thomas A. Jefferson, ... Robert L. Pitman, in Marine Mammals of the World, 2008. Nevertheless, general patterns do also emerge from several large-scale, international tagging efforts that have been conducted on northern (TOPP—Tagging of Pacific Predators) and southern elephant seal (MEOP—Marine Mammals Exploring the Oceans Pole to Pole) programs (see also Chapter 14). 2007; Aoki et al. Nevertheless, these extremely long migrations are not undertaken by all northern elephant seals. This is due to the fact that a carnivorous diet supplies its
Annual catches of hooded seals have always varied dramatically, depending largely upon ice conditions at the time of breeding. Adaptations of the harp seal. Harp seals also have cone photoreceptors (Nagy and Ronald, 1970) for vision in bright light, which possibly allow some form of color vision. This work has involved exploring data time series at fine spatial scales looking for changes in dive characteristics that indicate buoyancy changes that impact how easily seals descend or ascend (i.e., more or less fat).
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