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Are hybrids more fit than their pare...

Donovan, Jennifer Laura.

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Are hybrids more fit than their parental types? A test using two tiger swallowtail butterfly speices Papilio glaucus and P. canadensis (Lepidoptera: Papilionidae).

Record Type:	Electronic resources : Monograph/item
Title/Author:	Are hybrids more fit than their parental types? A test using two tiger swallowtail butterfly speices Papilio glaucus and P. canadensis (Lepidoptera: Papilionidae)./
Author:	Donovan, Jennifer Laura.
Description:	79 p.
Notes:	Source: Masters Abstracts International, Volume: 40-02, page: 0401.
Contained By:	Masters Abstracts International40-02.
Subject:	Biology, Entomology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1405929
ISBN:	0493341765

Are hybrids more fit than their parental types? A test using two tiger swallowtail butterfly speices Papilio glaucus and P. canadensis (Lepidoptera: Papilionidae).
Donovan, Jennifer Laura.

Are hybrids more fit than their parental types? A test using two tiger swallowtail butterfly speices Papilio glaucus and P. canadensis (Lepidoptera: Papilionidae). - 79 p.

Source: Masters Abstracts International, Volume: 40-02, page: 0401.

Thesis (M.S.)--Michigan State University, 2001.

The ranges of P. canadensis and P. glaucus overlap and form a hybrid zone at the boreal and temperate forest transition zone in the eastern half of the United States, between 41° and 44° north latitude. It has been documented that laboratory hybrid adults of P. glaucus and P. canadensis are fertile, produce normal gametes, and backcross or F-2 offspring (Hagen et al. 1991). It has also been shown in the laboratory and the field that prezygotic barriers are weakly effective at preventing cross fertilization (Deering 1998, Stump 2000). This study was designed to examine the strength of postzygotic barriers at the larval stage by simultaneously examining multiple indicators of fitness (growth rate, pupal weight, larval duration and survival to pupation) in reciprocal crosses hybrid and parental types of P. canadensis and P. glaucus. Parental type and reciprocal hybrid larvae were randomly assigned to a combination of temperature (15°C, 23°C, or 31°C) and host plant (Liriodendron tulipifera, Populus tremuloides, Prunus serotina). Hybrids showed patterns of significantly slower growth rates or smaller pupal weights than their parental types. The number of degree days required to complete hybrid larval development to pupation was always equal to or less than at least one of the parent types. Furthermore, in no treatment combination did hybrids ever perform less well than both parental types for any fitness trait. These results indicate that postzygotic barriers at the larval stage could potentially be weak.

ISBN: 0493341765Subjects--Topical Terms:

1018619
Biology, Entomology.

Are hybrids more fit than their parental types? A test using two tiger swallowtail butterfly speices Papilio glaucus and P. canadensis (Lepidoptera: Papilionidae).
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245 1 0 $a Are hybrids more fit than their parental types? A test using two tiger swallowtail butterfly speices Papilio glaucus and P. canadensis (Lepidoptera: Papilionidae).
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500 $a Adviser: J. Mark Scriber.
502 $a Thesis (M.S.)--Michigan State University, 2001.
520 $a The ranges of P. canadensis and P. glaucus overlap and form a hybrid zone at the boreal and temperate forest transition zone in the eastern half of the United States, between 41° and 44° north latitude. It has been documented that laboratory hybrid adults of P. glaucus and P. canadensis are fertile, produce normal gametes, and backcross or F-2 offspring (Hagen et al. 1991). It has also been shown in the laboratory and the field that prezygotic barriers are weakly effective at preventing cross fertilization (Deering 1998, Stump 2000). This study was designed to examine the strength of postzygotic barriers at the larval stage by simultaneously examining multiple indicators of fitness (growth rate, pupal weight, larval duration and survival to pupation) in reciprocal crosses hybrid and parental types of P. canadensis and P. glaucus. Parental type and reciprocal hybrid larvae were randomly assigned to a combination of temperature (15°C, 23°C, or 31°C) and host plant (Liriodendron tulipifera, Populus tremuloides, Prunus serotina). Hybrids showed patterns of significantly slower growth rates or smaller pupal weights than their parental types. The number of degree days required to complete hybrid larval development to pupation was always equal to or less than at least one of the parent types. Furthermore, in no treatment combination did hybrids ever perform less well than both parental types for any fitness trait. These results indicate that postzygotic barriers at the larval stage could potentially be weak.
590 $a School code: 0128.
650 4 $a Biology, Entomology. $3 1018619
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