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Color polymorphism in sphingid cater...

Fink, Linda Susan.

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Color polymorphism in sphingid caterpillars (Lepidoptera:Sphingidae).

Record Type:	Electronic resources : Monograph/item
Title/Author:	Color polymorphism in sphingid caterpillars (Lepidoptera:Sphingidae)./
Author:	Fink, Linda Susan.
Description:	273 p.
Notes:	Source: Dissertation Abstracts International, Volume: 51-03, Section: B, page: 1088.
Contained By:	Dissertation Abstracts International51-03B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9021849

Color polymorphism in sphingid caterpillars (Lepidoptera:Sphingidae).
Fink, Linda Susan.

Color polymorphism in sphingid caterpillars (Lepidoptera:Sphingidae). - 273 p.

Source: Dissertation Abstracts International, Volume: 51-03, Section: B, page: 1088.

Thesis (Ph.D.)--University of Florida, 1989.

Many polymorphic grasshoppers, butterfly pupae, and caterpillars are phenotypically labile, with color expression under environmental as well as genetic control. Sphingid caterpillars (Lepidoptera: Sphingidae) are polymorphic during one to four instars, with up to four color morphs per instar. I conducted experiments to understand the proximate factors causing sphingid caterpillars to switch colors, and addressed potential tradeoffs of being a particular morph in various environmental contexts. I focussed on Amphion floridensis, which is green or pink in the fourth instar, and conducted comparative experiments on three additional species.Subjects--Topical Terms:

1017726
Biology, Ecology.

Color polymorphism in sphingid caterpillars (Lepidoptera:Sphingidae).
LDR:03087nmm 2200313 4500 001 1861984
005 20041215074544.5
008 130614s1989 eng d
035 $a (UnM)AAI9021849
035 $a AAI9021849
040 $a UnM $c UnM
100 1 $a Fink, Linda Susan. $3 1949559
245 1 0 $a Color polymorphism in sphingid caterpillars (Lepidoptera:Sphingidae).
300 $a 273 p.
500 $a Source: Dissertation Abstracts International, Volume: 51-03, Section: B, page: 1088.
500 $a Chairman: H. Jane Brockman.
502 $a Thesis (Ph.D.)--University of Florida, 1989.
520 $a Many polymorphic grasshoppers, butterfly pupae, and caterpillars are phenotypically labile, with color expression under environmental as well as genetic control. Sphingid caterpillars (Lepidoptera: Sphingidae) are polymorphic during one to four instars, with up to four color morphs per instar. I conducted experiments to understand the proximate factors causing sphingid caterpillars to switch colors, and addressed potential tradeoffs of being a particular morph in various environmental contexts. I focussed on Amphion floridensis, which is green or pink in the fourth instar, and conducted comparative experiments on three additional species.
520 $a In 35 Amphion broods, the incidence of pink ranged from 2% to 86%. Genetic crosses indicated that color determination is a threshold trait with quantitative genetic inheritance (heritability = 0.24 $\ pm $ 0.25). Temperature, food species, and leaf color significantly affected the incidence of pink, but rearing density and photoperiod did not. Pupae of pink individuals were heavier, but pink females had lower fecundity than their green sisters. Foodplant species also affected morph frequencies in Eumorpha fasciata. Combined with published data, my experiments suggest that plant traits trigger color changes in many sphingids, and lead to nonrandom spatial distributions of morphs.
520 $a Behavioral differences also result in nonrandom morph distributions. Green Amphion larvae rested under leaves more often than on stems, whereas pink larvae did the reverse. Under natural conditions pink individuals gained less weight during the day than green ones, suggesting that resting away from leaves entails a cost. Similar leaf and nonleaf resting choices occurred among color morphs of Xylophanes tersa and Eumorpha fasciata, but not in Enyo lugubris or an earlier instar of E. fasciata.
520 $a Plasticity of color expression in sphingid caterpillars allows individuals to respond quickly to the phenotypic heterogeneity of their foodplants. Further experiments must clarify the adaptiveness of using foodplant cues to trigger color changes, and identify the major factors selecting for both phenotypic and behavioral variability.
590 $a School code: 0070.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Zoology. $3 1018632
650 4 $a Biology, Entomology. $3 1018619
690 $a 0329
690 $a 0472
690 $a 0353
710 2 0 $a University of Florida. $3 718949
773 0 $t Dissertation Abstracts International $g 51-03B.
790 1 0 $a Brockman, H. Jane, $e advisor
790 $a 0070
791 $a Ph.D.
792 $a 1989
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9021849