Marine Mammals of the World: A Comprehensive Guide to Their Identification
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.
movements, suggests the species may be particularly vulnerable to human impacts. IUCN status Data Deficient. References Donahue and Perryman 2002; Leatherwood et al. 1991; Madsen et al. 2004; Ross and Leatherwood 1994. 176 Marine Mammals of t h e W o r l d Mel0n-headed Whale--Peponocephala electra (Gray, 1846) R e c e n t l y - u s e d synonyms Lagenorhynchus asia, Lagenorhynchus electra, Electra electra. Common names En.-melon-headed whale; Sp.-calder6n pequeho or de~fin cabaza de
larger estuarine areas for foraging. They are moderately acrobatic. Groups in Hong Kong and in Australian waters often feed behind active trawlers. In Hong Kong, they do not feed around reefs, but often consume fish near the bottom in shallow, murky waters. Bowriding behavior is extremely rare, although some individuals may ride swells or vessel wakes. They are shy of boats in South Africa and many other parts of the range, but in Hong Kong, dolphins are very accustomed to heavy vessel traffic.
breaches and other aerial behaviors and generally raise behind the whale (as in this case). Bering Sea. PHOTO:J. DURBAN their flukes before a long dive. Interestingly, sightings in Hawaiian waters have mostly involved single animals in close proximity to groups of wintering humpback whales. As in the North Atlantic species, the mating system appears to involve sperm competition. Calving areas have not yet been identified in the North Pacific; the absence of many records from coastal areas in
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
longevity, but their Northern Hemisphere cousins can live to be at least 84 years old. Feeding and prey Very little is known about the feeding habits of this species, other than that they feed on squid (based on stomach contents). The feeding habits of Arnoux's beaked whales are assumed to be similar to those of their Northern Hemisphere relatives, Baird's beaked whales, thus consisting mostly of deepwater benthic and pelagic fishes and cephalopods. Threats and s t a t u s This species has