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Body fat condition of free-ranging r...

Angell, Carolyn Miller.

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Body fat condition of free-ranging right whales, Eubalaena glacialis and Eubalaena australis.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Body fat condition of free-ranging right whales, Eubalaena glacialis and Eubalaena australis./
作者:	Angell, Carolyn Miller.
面頁冊數:	256 p.
附註:	Major Professor: Vincent E. Dionne.
Contained By:	Dissertation Abstracts International66-08B.
標題:	Biology, Animal Physiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3186486
ISBN:	9780542284526

Body fat condition of free-ranging right whales, Eubalaena glacialis and Eubalaena australis.
Angell, Carolyn Miller.

Body fat condition of free-ranging right whales, Eubalaena glacialis and Eubalaena australis. - 256 p.

Major Professor: Vincent E. Dionne.

Thesis (Ph.D.)--Boston University, 2006.

Investigation of biological and environmental factors contributing to high variability in reproductive performance of northwest Atlantic right whales is critical to the conservation of this endangered population. Blubber thickness and body shape (series of body widths) were measured on free-swimming right whales (Eubalaena glacialis and Eubalaena australis ) using ultrasound and aerial photogrammetry to determine whether body fat condition varied with changes in reproductive status and in response to periods of reduced prey availability. Blubber thickness of females decreased during lactation, increased after weaning, and was thickest in females measured a few months prior to the start of pregnancy, indicating that females draw on blubber for energetic support for reproduction. Moreover, body shape caudal to the blowholes of lactating females was significantly thinner than that of non-lactating, non-pregnant females; most of this reduction occurred during the fasting portion of lactation. Juveniles and adult males measured during a year of low food abundance had significantly thinner blubber than those measured during years of greater food abundance. Taken together, these results suggest that blubber thickness and dorsal body shape are indices of right whale energy balance; therefore, the marked fluctuations in northwest Atlantic right whale reproduction likely have a nutritional component. Additionally, in the absence of assessing the capacities of these indices to predict actual body fat condition, the relationships between the indices were explored and compared with subjective assessments of relative fatness. Maximum body width and blubber thickness were correlated in juveniles, but not in lactating females, suggesting different rates of lipid catabolism among various lipid reserves. The subjective assessments appeared to capture general trends in body fat condition but lacked the precision of the quantitative indices. Such comparisons indicate that assessing body fat condition with a combination of indices is important to future monitoring of the condition of the northwest Atlantic right whale population.

ISBN: 9780542284526Subjects--Topical Terms:

1017835
Biology, Animal Physiology.

Body fat condition of free-ranging right whales, Eubalaena glacialis and Eubalaena australis.
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