東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

The structure and function of the bl...

Koopman, Heather Natalie.

FindBook

Google Book

Amazon

博客來

The structure and function of the blubber of odontocetes.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The structure and function of the blubber of odontocetes./
作者:	Koopman, Heather Natalie.
面頁冊數:	408 p.
附註:	Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4001.
Contained By:	Dissertation Abstracts International63-09B.
標題:	Biology, Animal Physiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3063193
ISBN:	049381938X

The structure and function of the blubber of odontocetes.
Koopman, Heather Natalie.

The structure and function of the blubber of odontocetes. - 408 p.

Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4001.

Thesis (Ph.D.)--Duke University, 2001.

Blubber is a unique adaptation for energy storage, thermoregulation, and mechanics in marine mammals, but little is known about its structure and specific functions for most species. I examined the morphology, ultrastructure, and biochemical composition of blubber and used these data to infer the function of this tissue in a range of odontocete species. Harbour porpoises ( Phocoena phocoena) are an interesting model for studying blubber structure and function in odontocetes, because their small size and demanding annual reproductive schedule, combined with the thermoregulatory challenges of a cold water habitat, place them on one end of the cetacean size/temperature/energy demand continuum. The characteristics of blubber were compared between juvenile porpoises in normal body condition with those known to have starved to death. In porpoises, starvation affects only the innermost layer of the blubber of the thorax, leaving the tailstock blubber and that of the outer layer of the thorax intact, in terms of blubber thickness, adipocyte size, and lipid composition. Therefore, less than 50% of the blubber is potentially mobilisable energy in harbour porpoises, and probably also in other small odontocetes. In female harbour porpoises, milk lipids are derived from dietary intake, rather than maternal blubber. Examination of levels of isovaleric acid in blubber across 30 species of toothed whales revealed that this unusual, toxic fatty acid accumulates in higher concentrations in the outer (superficial) layer of the blubber, and does so in an ontogenetic fashion. The presence of isovaleric acid may represent an adaptation that confers some advantage to odontocetes inhabiting cold water. Overall, the blubber structure of odontocetes is influenced by phylogeny, ontogeny and habitat. In all species examined, blubber is stratified so that dietary fatty acids are more abundant in the inner layer, and endogenously synthesised compounds dominate the outer layer. In beaked and sperm whales, triglycerides in blubber are gradually replaced by wax esters as animals grow, possible reflecting an adaptation to pressure and temperature. The blubber of odontocetes exhibits a high degree of variability in its composition and functions, reflecting the diversity in habitat, body size and life history of this suborder.

ISBN: 049381938XSubjects--Topical Terms:

1017835
Biology, Animal Physiology.

The structure and function of the blubber of odontocetes.
LDR:03193nmm 2200277 4500 001 1844811
005 20051017075517.5
008 130614s2001 eng d
020 $a 049381938X
035 $a (UnM)AAI3063193
035 $a AAI3063193
040 $a UnM $c UnM
100 1 $a Koopman, Heather Natalie. $3 1932995
245 1 4 $a The structure and function of the blubber of odontocetes.
300 $a 408 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4001.
500 $a Supervisor: Andrew J. Read.
502 $a Thesis (Ph.D.)--Duke University, 2001.
520 $a Blubber is a unique adaptation for energy storage, thermoregulation, and mechanics in marine mammals, but little is known about its structure and specific functions for most species. I examined the morphology, ultrastructure, and biochemical composition of blubber and used these data to infer the function of this tissue in a range of odontocete species. Harbour porpoises ( Phocoena phocoena) are an interesting model for studying blubber structure and function in odontocetes, because their small size and demanding annual reproductive schedule, combined with the thermoregulatory challenges of a cold water habitat, place them on one end of the cetacean size/temperature/energy demand continuum. The characteristics of blubber were compared between juvenile porpoises in normal body condition with those known to have starved to death. In porpoises, starvation affects only the innermost layer of the blubber of the thorax, leaving the tailstock blubber and that of the outer layer of the thorax intact, in terms of blubber thickness, adipocyte size, and lipid composition. Therefore, less than 50% of the blubber is potentially mobilisable energy in harbour porpoises, and probably also in other small odontocetes. In female harbour porpoises, milk lipids are derived from dietary intake, rather than maternal blubber. Examination of levels of isovaleric acid in blubber across 30 species of toothed whales revealed that this unusual, toxic fatty acid accumulates in higher concentrations in the outer (superficial) layer of the blubber, and does so in an ontogenetic fashion. The presence of isovaleric acid may represent an adaptation that confers some advantage to odontocetes inhabiting cold water. Overall, the blubber structure of odontocetes is influenced by phylogeny, ontogeny and habitat. In all species examined, blubber is stratified so that dietary fatty acids are more abundant in the inner layer, and endogenously synthesised compounds dominate the outer layer. In beaked and sperm whales, triglycerides in blubber are gradually replaced by wax esters as animals grow, possible reflecting an adaptation to pressure and temperature. The blubber of odontocetes exhibits a high degree of variability in its composition and functions, reflecting the diversity in habitat, body size and life history of this suborder.
590 $a School code: 0066.
650 4 $a Biology, Animal Physiology. $3 1017835
650 4 $a Biology, Zoology. $3 1018632
690 $a 0433
690 $a 0472
710 2 0 $a Duke University. $3 569686
773 0 $t Dissertation Abstracts International $g 63-09B.
790 1 0 $a Read, Andrew J., $e advisor
790 $a 0066
791 $a Ph.D.
792 $a 2001
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3063193