Factors affecting abundance of bowhead whales Balaena mysticetus in the eastern arctic of North America, 1915–1980

SummaryOne hundred and sixty Scottish psychiatrists complete a questionnaire eliciting the extent of their use of the term ‘borderline patient’ and the factors affecting this. The term was used by 27.5 per cent, the majority of whom felt that it ought to be included in current diagnostic classification systems. There was, however, general dissatisfaction with the vagueness of current definitions of the term and a confusing use of numerous diagnostic labels.Use of the term was not related to status, geographical location, or familiarity with American psychiatric literature. The practice of psychodynamically-oriented psychotherapy and extended working contact with psychiatry in North America were found significantly to increase its use.

Download Full-text

Hydrodynamic patterns associated with echelon formation swimming by feeding bowhead whales (Balaena mysticetus)

Marine Mammal Science ◽

10.1111/mms.12004 ◽

2012 ◽

pp. n/a-n/a

Author(s):

Frank E. Fish ◽

Kimberly T. Goetz ◽

David J. Rugh ◽

Linda Vate Brattström

Keyword(s):

Balaena Mysticetus ◽

Bowhead Whales

Download Full-text

Stable carbon and nitrogen isotope patterns in baleen from eastern Arctic bowhead whales (Balaena mysticetus)

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f98-142 ◽

1998 ◽

Vol 55 (12) ◽

pp. 2601-2607 ◽

Cited By ~ 58

Author(s):

Keith A Hobson ◽

Don M Schell

Keyword(s):

Nutritional Ecology ◽

Nitrogen Isotope ◽

Protein Catabolism ◽

Stable Carbon ◽

Balaena Mysticetus ◽

Bowhead Whales ◽

Carbon And Nitrogen ◽

Naturally Occurring ◽

Western Arctic ◽

Periodic Fluctuations

Previous measurements of naturally occurring stable isotopes of carbon (delta13C) and nitrogen (delta15N) along the baleen plates of western Arctic bowhead whales (Balaena mysticetus) have provided a continuous lifetime record of the feeding or nutritional ecology of these animals that migrate annually between isotopically different foodwebs. However, virtually nothing was known about isotopic patterns of eastern Arctic bowheads. We measured delta13C and delta15N values along the baleen plates of three eastern and one western Arctic bowhead whales taken from Canadian waters in 1988 and 1996. In contrast to western Arctic animals, we found strong evidence for periodic fluctuations in delta15N but not delta13C values in the eastern Arctic specimens. We interpret these results as evidence that eastern Arctic animals do not move between foodwebs that differ in delta13C signature and suggest that these whales either (i) move annually between areas isotopically enriched in 15N but not 13C, (ii) shift diet annually by about one third of a trophic level, or (iii) undergo seasonal fasting that results in enrichment of baleen delta15N resulting from protein catabolism.

Download Full-text