摘要:

AbstractPiecemeal body weights of eleven fin and four sei whales and intact weights of three foetuses, obtained from Iceland, are compared with published weight data. The Icelandic fin are similar to other northern hemisphere animals but are significantly leaner than their Antarctic counterparts. The Icelandic sei appear heavier than the North Pacific sei whales. Their weights cannot be predicted from a North Pacific sei whale weight/length formula. Length, girth and blubber thickness measurements indicate changes in relative body dimensions in the early fin whale foetus compared with juveniles and adults; however, the midterm sei whale foetus is similar to the adult and juvenile sei whales. The blubber appears to form a major component even in the foetal body. The integration of a standard series of lengths, girths and blubber thicknesses in juveniles and adults can provide an estimate of the blubber component. Both girth and length are significant parameters in estimating body weight, a simple weight/length formula being found to be inadequate to allow for variability in body fatness. Evaluation of such a multiple parameter formula for calculating weight appears satisfactory for both fin and sei whales. Apparent weight/length differences between species and stocks may thus be partly due to variations in body fatness.

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1986.tb00039.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

AbstractThe spotted dolphin (Stenella attenuata), a species commonly associated with the tuna fishery, is widely distributed in the eastern tropical Pacific Ocean (ETP). Geographic patterns in morphological characteristics of this dolphin were evaluated for 36 skull measurements of 574 museum specimens allocated to 5° latitude‐longitude blocks. A strong subdivision between northern and southern offshore populations was demonstrated using principal components, canonical variates and cluster (UPGMA and function‐point) analyses of block means derived from standardized, sex‐adjusted measurements. Classification functions derived from a stepwise multiple discriminant analysis correctly identified more than 87 percent of the specimens as being from either a northern or southern locality. These results support recognition of southern spotted dolphins as a separate management stock. Dolphins from a sample representing a far‐western locality show similarities with those from the south. Patterns of geographic variation in morphology were evaluated using Mantel tests and matrix correlations; 17 of the 36 characters showed regional patterning and 18 exhibited local patterning. Morphological trends were also assessed with respect to 14 oceanographic measures that characterize environmental variability in the ETP. In general, clinal variation in morphology mirrors a north‐south trend found in several environmental variables. Overall, the most striking associations between morphological and environmental variables involved Solar Insolation (Jan.). Sea surface temperatures also exhibited a strong association with morphological variables; the highest correspondence was found between width of the temporal fossa and sea surface temperature in July. In addition, the thickness of the oxygen minimum layer exhibited a pattern of variation that was statistically associated with 58 percent of the skull characters. The geographic patterns found for cranial morphology and environmental measures are strongly clinal and in general congruent, suggesting that oceanographic conditions in part determine trends in morphological characteristics of spotte

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1986.tb00040.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

AbstractUnder a U.S.‐U.S.S.R. cooperative Marine Mammal Project, shipboard cruises were made in 1979, 1980 and 1982, primarily to determine whether there is a substock of western Arctic bowhead whales (Balaena mysticetus) that summers in the western Chukchi Sea instead of migrating to the Beaufort Sea. More than 100 bowheads were sighted along the north Chukotka coast of Siberia in October 1979, and more than 200 bowheads were sighted there in September 1980. None were seen anywhere in the Chukchi Sea in late July and August 1982. We conclude that the September and October sightings were of animals returning early from the Beaufort Sea and that, other than occurrences peripheral to the main migration, there are no large concentrations in the Chukchi in the summer and there is apparently no western Chukchi substoc

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1986.tb00041.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1986.tb00042.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1986.tb00043.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1986.tb00044.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1986.tb00045.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

Book reviews in this article:Handbook ofMarineMammals. Volume3: TheSirenians andBaleenWhales. S. H. Ridgway and R. Harrison (eds.).LesPhoquesMoines‐MonkSeal. Ronald and R. Duguy (eds.).TheElements ofGraphingData. W. S. Cleveland.GuiaPara elReconocimiento deCetaceos delMarArgentino. A. Lichter and A. Hooper.MamiferosMarinos deChile. W. Sielfeld K.TheWhaleWatcher'sHandbook. E. Hoyt. Illustrations by P. Folkens.Whales andDolphins ofNewZealand andAustralia: AnIdentificationGuide. A. N. Bake

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1986.tb00047.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

ISSN:0824-0469    

DOI:10.1111/j.1748-7692.1986.tb00048.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY