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Gonadal steroid endocrinology of sea...

Wibbels, Thane Richard.

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Gonadal steroid endocrinology of sea turtle reproduction.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Gonadal steroid endocrinology of sea turtle reproduction./
作者:	Wibbels, Thane Richard.
面頁冊數:	129 p.
附註:	Chairman: David Wm. Owens.
Contained By:	Dissertation Abstracts International49-11B.
標題:	Biology, Zoology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8903419

Gonadal steroid endocrinology of sea turtle reproduction.
Wibbels, Thane Richard.

Gonadal steroid endocrinology of sea turtle reproduction. - 129 p.

Chairman: David Wm. Owens.

Thesis (Ph.D.)--Texas A&M University, 1988.

Serum T concentrations were used to predict the sex of 218 immature C. caretta captured near Hutchinson Island, FL. The sex ratio (2.1 female: 1.0 male) was significantly different from a 1:1 ratio predicted by sex allocation theory.Subjects--Topical Terms:

1018632
Biology, Zoology.

Gonadal steroid endocrinology of sea turtle reproduction.
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245 1 0 $a Gonadal steroid endocrinology of sea turtle reproduction.
300 $a 129 p.
500 $a Chairman: David Wm. Owens.
500 $a Source: Dissertation Abstracts International, Volume: 49-11, Section: B, page: 4717.
502 $a Thesis (Ph.D.)--Texas A&M University, 1988.
520 $a Serum T concentrations were used to predict the sex of 218 immature C. caretta captured near Hutchinson Island, FL. The sex ratio (2.1 female: 1.0 male) was significantly different from a 1:1 ratio predicted by sex allocation theory.
520 $a Immature loggerhead, Caretta caretta, green, Chelonia mydas, and hawksbill, Eretmochelys imbricata, sea turtles had relatively low serum concentrations of testosterone (T), estradiol-17$\beta$ (E$\sb2$), and progesterone (Pro) during the prolonged maturation period in (possibly 50 years or more). However, immature males had significantly higher serum T than immature females and serum T increased significantly during "puberty" in male C. mydas. The results also suggest that T stimulates tail elongation, a secondary sexual characteristic, in males.
520 $a Adult male C. caretta possessed a prenuptial spermatogenic pattern that was positively correlated with increased serum T. Serum T remained high through migration and mating seasons suggesting that T could affect those behaviors. In contrast to adult females, adult male C. caretta may be reproductively active every year.
520 $a Adult female C. caretta also possessed a prenuptial pattern of gonadal recrudescence coincident with gonadal steroid production. Females exhibited a significant elevation in serum E$\sb2$ approximately 4-6 weeks prior to migration indicating increased vitellogenesis. Serum T increased immediately prior to migration, suggesting that T could affect migratory and/or mating behaviors. Caretta caretta have relatively high serum T, E$\sb2$, and Pro during nesting if there is to be a subsequent ovulation, otherwise the concentrations of all three steroids are low. In female C. caretta and C. mydas, serum T was high at the time of nesting and then decreased during the periovulatory period when serum follicle-stimulating hormone (FSH), luteinizing hormone (LH) and Pro increases significantly, suggesting that FSH, LH and Pro may stimulate ovulation, whereas T is a likely candidate for mediating the hormonal surges associated with ovulation.
520 $a The prenuptial gonadal cycles of C. caretta with temporally associated gonadal steroid production and reproductive behaviors indicate that marine adaptation may have facilitated the retention of a primitive reproductive cycle in sea turtles. Therefore, the actions suggested for gonadal steroids in sea turtles (including the classical roles in gametogenesis, ovulation, and mating, as well as a role in migration) may represent primitive functions for these hormones in reptiles.
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690 $a 0472
710 2 $a Texas A&M University. $3 718977
773 0 $t Dissertation Abstracts International $g 49-11B.
790 $a 0803
790 1 0 $a Owens, David Wm., $e advisor
791 $a Ph.D.
792 $a 1988
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