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BukuDiet-induced phenotypic plasticity of feeding morphology in the genus Lepomis
Author: Hegrenes, Scott Grayson ; Juliano, Steven A. (Advisor)
Bahasa: (EN )    ISBN: 0-599-44287-5    
Penerbit: ILLINOIS STATE UNIVERSITY     Tahun Terbit: 1999    
Jenis: Theses - Dissertation
Fulltext: 9942644.pdf (0.0B; 2 download)
A population of a generalist can consist of two or more recognizable morphotypes specialized to exploit a particular habitat and niche. Divergent benthic and pelagic morphs of sunfish of the North American sunfish genus Lepomis have been found in some populations. The proximate cause of this phenomenon is not known. It could be differential survival and habitat segregation among different morphs produced by different genotypes within a species or it could be a phenotypically plastic response to the environment. In fish, diet and feeding mode may be environmental factors influencing body shape, gill raker morphology, and pharyngeal jaw morphology. I tested the hypothesis that variation in feeding morphology (body shape, gill raker morphology, and pharyngeal jaw morphology) in species from the genus Lepomis is a product of phenotypic plasticity in response to diet. In addition to tests of plasticity in the orangespotted and green sunfish, I compared the diet-induced plasticity of pumpkinseed and bluegill sunfish where they occur in sympatry and in allopatry to ascertain whether specific ecological situations have led to selection for plasticity. The information obtained from the investigation of diet-induced plasticity was used to map the trait of phenotypic plasticity on extant phylogenies of the genus Lepomis.
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