Marine Mammals of the World: A Comprehensive Guide to Their Identification

Marine Mammals of the World: A Comprehensive Guide to Their Identification

Language: English

Pages: 592

ISBN: 0123838533

Format: PDF / Kindle (mobi) / ePub

With coverage on all the marine mammals of the world, authors Jefferson, Webber, and Pitman have created a user-friendly guide to identify marine mammals alive in nature (at sea or on the beach), dead specimens “in hand”, and also to identify marine mammals based on features of the skull. This handy guide provides marine biologists and interested lay people with detailed descriptions of diagnostic features, illustrations of external appearance, beautiful photographs, dichotomous keys, and more. Full color illustrations and vivid photographs of every living marine mammal species are incorporated, as well as comprehendible maps showing a range of information. For readers who desire further consultation, authors have included a list of literature references at the end of each species account. For an enhanced understanding of habitation, this guide also includes recognizable geographic forms described separately with colorful paintings and photographs. All of these essential tools provided make Marine Mammals of the World the most detailed and authoritative guide available!

* Contains superb photographs of every species of marine mammal for accurate identification
* Authors’ collective experience adds up to 80 years, and have seen nearly all of the species and distinctive geographic forms described in the guide
* Provides the most detailed and anatomically accurate illustrations currently available
* Special emphasis is placed on the identification of species in “problem groups,” such as the beaked whales, long-beaked oceanic dolphin, and southern fur seals
* Includes a detailed list of sources for more information at the back of the book.

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directly by local people in West Africa. there should not be any identification problems, as the Habitat destruction, vessel collisions, and environmental two do not overlap in distribution. contamination may be additional threats. There are no Distribution Atlantic humpback dolphins occur in statistically defensible estimates of abundance available for anywhere in the range, although there are thought to nearshore waters off tropical to subtropical West Africa, from Morocco south to at least

frustratingly difficult to tell apart in typical situations. The classic character is the number of head ridges--three in 30N Bryde's whales and only one in sei whales; but this can be very difficult to see on distant sightings and care must 0' be taken to avoid getting confused by rippling water and 30S . glare on top of the head. Much of the literature on the two species still to this day contains identification errors. Finally, until the external appearance of the recently-de6os ~i ~ " scribed

geographic forms There is significant geographic variation in virtually every species of marine mammal. However, beyond this for some species, distinct geographic forms have been described and M a r i n e M a m m a l s of the World possess external characteristics that allow them to be identified in the field. When this is the case, we present a short description of such geographic forms in this section. If 'none' is listed, this does not mean that geographic forms do not exist, but rather

features for identification. Feeding and prey This section contains a brief list of the types of prey items that the species feeds upon. T h r e a t s and status The history of human exploitation of the species is briefly reviewed, and current conservation issues identified. Available population estimates are of variable accuracy, and should thus be taken cautiously. Techniques for estimating sizes of mammal Fishing nets, in particular various forms of gillnets and driftnets, kill hundreds of

absent. Shepherd's beaked whales have a distinctive color pattern, perhaps the most diagnostic of all the beaked whales. It appears to be present on all age and sex classes (including calves). The back and sides are mostly dark brownish gray, and the belly is white or light gray. The light ventral field extends up onto the sides in three areas 1) on the side of the face to just below the gape and eye, 2) in a rounded patch posterior of the flippers to just past midway up the side, and 3) on the

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