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A Pluralistic Analysis of Character Release in Pumpkinseed Sunfish (Lepomis Gibbosus)

While the importance of competition in adaptive divergence has recently been demonstrated in a number of systems, its interaction with other ecological factors has been neglected. We attempt a more pluralistic approach in this comparative study of divergence in pumpkinseed sunfish (Lepomis... Full description

1st Person: Robinson, Beren W.
Additional Persons: Wilson, David Sloan verfasserin; Margosian, Arlene S. verfasserin
Source: in Ecology : a publication of the Ecological Society of America Vol. 81, No. 10 (2000), p. 2799-2812
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Type of Publication: Article
Language: English
Published: 2000
Keywords: research-article
Adaptive Divergence
Allopatry
Character Displacement
Character Release
Competition
Evolution
Lepomis gibbosus
Postglacial Lakes
Specialization
Sunfish
Sympatry
Trophic/Resource Polymorphism
Online: Volltext
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100 1 |a Robinson, Beren W. 
245 1 2 |a A Pluralistic Analysis of Character Release in Pumpkinseed Sunfish (Lepomis Gibbosus)  |h Elektronische Ressource 
300 |a Online-Ressource 
500 |a Copyright: Copyright 2000 Ecological Society of America 
520 |a While the importance of competition in adaptive divergence has recently been demonstrated in a number of systems, its interaction with other ecological factors has been neglected. We attempt a more pluralistic approach in this comparative study of divergence in pumpkinseed sunfish (Lepomis gibbosus) from the Adirondack region of New York. In some lakes, pumpkinseed forms that use shallow- and open-water environments coexist. We tested four predictions relating to an hypothesis of character release: (1) Pumpkinseed divergence is favored in the absence of the closely related bluegill sunfish (L. macrochirus), a known competitor elsewhere, (2) divergence is favored when the combined effects of other planktivorous fish taxa that may impose diffuse competition is reduced, (3) divergence is positively related to lake size because larger lakes provide more distinct and diverse environments, and (4) divergence is favored in lakes dominated by open-water habitat. In two lakes with introduced bluegill (sympatry), bluegill appear to limit pumpkinseed divergence, as they do elsewhere. Pumpkinseeds were neither found in the open-water habitat, nor did they eat significant amounts of open-water prey. In nine allopatric lakes selected for their similarity to the sympatric lakes, pumpkinseeds were ecologically and morphologically divergent, consistent with a character release hypothesis. Morphological divergence followed functional expectations. Open-water pumpkinseeds generally had longer caudal peduncles, shorter heads, thinner bodies, and smaller paired fins compared to shallow-water pumpkinseeds (heritable variation in body shape has been demonstrated elsewhere). Among 26 allopatric lakes, other planktivores had a negative effect on intrapopulation divergence as if they collectively imposed diffuse competition. Surprisingly, lake size was unrelated to divergence, and the amount of open-water habitat had an unexpected negative effect. Mean body size was also negatively related to divergence. Our findings illustrate that a variety of ecological factors, in addition to competition, may influence the divergence of pumpkinseeds, and possibly other fishes in postglacial north temperate lakes. 
653 |a research-article 
653 |a Adaptive Divergence 
653 |a Allopatry 
653 |a Character Displacement 
653 |a Character Release 
653 |a Competition 
653 |a Evolution 
653 |a Lepomis gibbosus 
653 |a Postglacial Lakes 
653 |a Specialization 
653 |a Sunfish 
653 |a Sympatry 
653 |a Trophic/Resource Polymorphism 
700 1 |a Wilson, David Sloan  |e verfasserin  |4 aut 
700 1 |a Margosian, Arlene S.  |e verfasserin  |4 aut 
773 0 8 |i in  |t Ecology : a publication of the Ecological Society of America  |d [New York] : Wiley  |g Vol. 81, No. 10 (2000), p. 2799-2812  |q 81:10<2799-2812  |w (DE-601)JST028313062  |x 1939-9170 
856 4 1 |u https://www.jstor.org/stable/177342  |3 Volltext 
856 4 1 |u http://dx.doi.org/10.2307/177342  |3 Volltext 
912 |a GBV_JSTOR 
951 |a AR 
952 |d 81  |j 2000  |e 10  |h 2799-2812 

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