Quantitative Genetic Variation in Static Allometry in the Threespine Stickleback

被引:27
|
作者
McGuigan, Katrina [1 ,2 ]
Nishimura, Nicole [1 ]
Currey, Mark [1 ]
Hurwit, Dan [1 ]
Cresko, William A. [1 ]
机构
[1] Univ Oregon, Ctr Ecol & Evolut, Eugene, OR 97403 USA
[2] Univ Queensland, Sch Biol Sci, Brisbane, Qld 4072, Australia
关键词
GASTEROSTEUS-ACULEATUS; BODY-SIZE; ADAPTIVE RADIATION; NATURAL-SELECTION; PREY-CAPTURE; TRAIT LOCI; EVOLUTION; SHAPE; LAKE; MORPHOLOGY;
D O I
10.1093/icb/icq026
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
The common pattern of replicated evolution of a consistent shape-environment relationship might reflect selection acting in similar ways within each environment, but divergently among environments. However, phenotypic evolution depends on the availability of additive genetic variation as well as on the direction of selection, implicating a bias in the distribution of genetic variance as a potential contributor to replicated evolution. Allometry, the relationship between shape and size, is a potential source of genetic bias that is poorly understood. The threespine stickleback, Gasterosteus aculeatus, provides an ideal system for exploring the contribution of genetic variance in body shape allometry to evolutionary patterns. The stickleback system comprises marine populations that exhibit limited phenotypic variation, and young freshwater populations which, following independent colonization events, have often evolved similar phenotypes in similar environments. In particular, stickleback diversification has involved changes in both total body size and relative size of body regions (i.e., shape). In a laboratory-reared cohort derived from an oceanic Alaskan population that is phenotypically and genetically representative of the ancestor of the diverse freshwater populations in this region, we determined the phenotypic static allometry, and estimated the additive genetic variation about these population-level allometric functions. We detected significant allometry, with larger fish having relatively smaller heads, a longer base to their second dorsal fin, and longer, shallower caudal peduncles. There was additive genetic variance in body size and in size-independent body shape (i.e., allometric elevation), but typically not in allometric slopes. These results suggest that the parallel evolution of body shape in threespine stickleback is not likely to have been a correlated response to selection on body size, or vice versa. Although allometry is common in fishes, this study highlights the need for additional data on genetic variation in allometric functions to determine how allometry evolves and how it influences phenotypic evolution.
引用
收藏
页码:1067 / 1080
页数:14
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