Download Antarctic Seals: Research Methods and Techniques by R. M. Laws PDF

By R. M. Laws

This booklet describes the tools and methods for box experiences of the inhabitants ecology of seals as a way to assemble easy medical details and to help in conservation efforts. The papers during this e-book make particular innovations for estimating inhabitants sizes, for learning their habit on land and at sea, and for immobilizing, shooting, marking, and, the place priceless, humanely killing seals so that it will learn body structure, vitamin, bioenergetics, and make age determinations.

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Harwood Hammond (1989) and Marsh & Sinclair (1989). The abundance estimates can then be divided by this probability to correct for visibility bias. g. crabeater seals). 00 h with peak haul out occurring about mid-day local time (Erickson, Bledsoe & Hanson, 1989). Fur seals may also show diurnal haul out patterns, even during the breeding season. Elephant seals, which remain on land during the breeding and moulting seasons, do not show this tendency. In order to correct for this variation with time of day, it is desirable to carry out activity studies periodically throughout the survey.

Post-canines large, recurved pointed with main crown and two lateral cusps; cheek teeth interlock when jaw closed (as in crabeater) (see Fig. 11). Identification of species 21 Skull Overall length up to 431 mm. Fore flipper Large, otariid-like, well back on body. , also trilling and moaning. Unmistakable haunting quality once heard; sometimes heard when out of water. Antarctic and Sub-Antarctic fur seals, Arctocephalus gazella (Peters, 1875), A. tropicalis (Gray, 1872). Figs. 14 Two species of fur seal are found south of the Antarctic Convergence; A.

Coarse single hair coat. No obvious neck. Teeth not lobed. 5 m, 4000 kg (male). Elephant seal (Mirounga leonina) Figs. 3 Identification of species 6. Profile lithe and streamlined with flanks tailing off. (a) Profile plump, barrel-shaped. 7. Very large head and thorax; distinct neck. Dark and light spots overall (a) Head moderate size; coat mainly silver-grey or cream with reticulated markings mainly on shoulders and near tail; snout upturned. Often scarred on flanks and belly with long parallel stripes.

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