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Genetic and environmental components...

Forster-Blouin, Sharon Lee.

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Genetic and environmental components of thermal tolerance in the least killifish, Heterandria formosa.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Genetic and environmental components of thermal tolerance in the least killifish, Heterandria formosa./
Author:	Forster-Blouin, Sharon Lee.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1989,
Description:	128 p.
Notes:	Source: Dissertation Abstracts International, Volume: 51-02, Section: B, page: 5490.
Contained By:	Dissertation Abstracts International51-02B.
Subject:	Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9016486

Genetic and environmental components of thermal tolerance in the least killifish, Heterandria formosa.
Forster-Blouin, Sharon Lee.

Genetic and environmental components of thermal tolerance in the least killifish, Heterandria formosa. - Ann Arbor : ProQuest Dissertations & Theses, 1989 - 128 p.

Source: Dissertation Abstracts International, Volume: 51-02, Section: B, page: 5490.

Thesis (Ph.D.)--The Florida State University, 1989.

Populations of the least killifish, Heterandria formosa are found in a wide variety of habitats, including habitats that differ widely in average temperature and in range of seasonal temperatures. To determine whether this ability to exist in thermally different sites is owing to phenotypic plasticity or to population differentiation I raised fish from a spring site and a pond site under common laboratory conditions. Fish were raised at one of two temperatures during gestation and at one of two temperatures from birth to sexual maturity. Gestation temperature, rearing temperature, population of origin, and gender had complex, interacting effects on critical thermal maximum and minimum at sexual maturity, on offspring survival, and on time to maturity. In particular, the populations were strongly differentiated for offspring survival and time to maturity, although the magnitude of the differences depended on the environment. Females performed better than males when genders differed.Subjects--Topical Terms:

516476
Ecology.

Genetic and environmental components of thermal tolerance in the least killifish, Heterandria formosa.
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100 1 $a Forster-Blouin, Sharon Lee. $3 3341771
245 1 0 $a Genetic and environmental components of thermal tolerance in the least killifish, Heterandria formosa.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1989
300 $a 128 p.
500 $a Source: Dissertation Abstracts International, Volume: 51-02, Section: B, page: 5490.
500 $a Major Professor: Joseph Travis.
502 $a Thesis (Ph.D.)--The Florida State University, 1989.
520 $a Populations of the least killifish, Heterandria formosa are found in a wide variety of habitats, including habitats that differ widely in average temperature and in range of seasonal temperatures. To determine whether this ability to exist in thermally different sites is owing to phenotypic plasticity or to population differentiation I raised fish from a spring site and a pond site under common laboratory conditions. Fish were raised at one of two temperatures during gestation and at one of two temperatures from birth to sexual maturity. Gestation temperature, rearing temperature, population of origin, and gender had complex, interacting effects on critical thermal maximum and minimum at sexual maturity, on offspring survival, and on time to maturity. In particular, the populations were strongly differentiated for offspring survival and time to maturity, although the magnitude of the differences depended on the environment. Females performed better than males when genders differed.
520 $a H. formosa also exhibit superfetation, the presence of embryos in different developmental stages in the ovary at one time. There have been few comparative studies of interspecific variation in superfetation, and there have been no surveys of population variation in reproductive traits within a superfetating species. In this study I followed seasonal changes in reproductive parameters of four populations of H. formosa for all or part of 4 years.
520 $a The four populations differed in breeding phenology, level of superfetation, total volume of embryos carried, and brood size. This variation does not correspond to either general habitat similarities among the populations (ponds versus rivers), or to habitat stability. I also discovered that first, females must hold back some same-stage embryos while advancing others and second, that size of females, as measured by standard length, clearly influences the total number of embryos, brood size, and number of embryos carried in each stage. Yet despite this relationship between body size and embryo capacity, brood size is not constrained by space available for late-stage embryos.
590 $a School code: 0071.
650 4 $a Ecology. $3 516476
650 4 $a Remote sensing. $3 535394
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710 2 $a The Florida State University. $3 1017727
773 0 $t Dissertation Abstracts International $g 51-02B.
790 $a 0071
791 $a Ph.D.
792 $a 1989
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9016486