Very low levels of direct additive genetic variance in fitness and fitness components in a red squirrel population.
Very low levels of direct additive genetic variance in fitness and fitness components in a red squirrel population.
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DOI：
10.1002/ece3.982
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发表时间：
2014-05
影响因子：
2.6
通讯作者：
McAdam, Andrew G.
中科院分区：
文献类型：
--
作者：
McFarlane, S. Eryn;Gorrell, Jamieson C.;Coltman, David W.;Humphries, Murray M.;Boutin, Stan;McAdam, Andrew G.
关键词：
一个性状必须在遗传上与适应性相关，才能根据自然选择而进化，但理论表明，强方向选择应该会削弱适应性的加性遗传变异，并限制未来的进化潜力。平衡选择被认为是一种机制，如果适应度成分相互权衡，则可以维持遗传方差，并被用来解释适应度成分中比突变选择平衡预期更高水平的加性遗传方差的经验观察结果。在这里，我们对单独标记的北美红松鼠 (Tamiasciurus hudsonicus) 种群进行了一项长期研究，以寻找以下证据：(1) 终生繁殖成功率中的加性遗传变异；(2) 健康成分之间的健康权衡，例如雄性和雌性健康度或在高资源和低资源环境中的健康度。对多代谱系的“动物模型”分析显示，母体对健康的影响不大，但在终生繁殖成功率以及每种性别和环境中的健康测量方面，加性遗传方差的水平非常低。因此，红松鼠的适应性和适应性成分的直接遗传变异水平似乎非常低，以促进该种群的当代适应。
A trait must genetically correlate with fitness in order to evolve in response to natural selection, but theory suggests that strong directional selection should erode additive genetic variance in fitness and limit future evolutionary potential. Balancing selection has been proposed as a mechanism that could maintain genetic variance if fitness components trade off with one another and has been invoked to account for empirical observations of higher levels of additive genetic variance in fitness components than would be expected from mutation–selection balance. Here, we used a long-term study of an individually marked population of North American red squirrels (Tamiasciurus hudsonicus) to look for evidence of (1) additive genetic variance in lifetime reproductive success and (2) fitness trade-offs between fitness components, such as male and female fitness or fitness in high- and low-resource environments. “Animal model” analyses of a multigenerational pedigree revealed modest maternal effects on fitness, but very low levels of additive genetic variance in lifetime reproductive success overall as well as fitness measures within each sex and environment. It therefore appears that there are very low levels of direct genetic variance in fitness and fitness components in red squirrels to facilitate contemporary adaptation in this population.
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影响因子：
56.9
作者：
Boutin, Stan;Wauters, Lucas A.;Dhondt, Andre A.
通讯作者：
Dhondt, Andre A.
影响因子：
56.9
作者：
Dantzer, Ben;Newman, Amy E. M.;McAdam, Andrew G.
通讯作者：
McAdam, Andrew G.
DOI：
10.1098/rspb.2005.3357
发表时间：
2006-03-07
影响因子：
4.7
作者：
Coulson, T;Benton, TG;Gaillard, JM
通讯作者：
Gaillard, JM
DOI：
10.1073/pnas.041378098
发表时间：
2001-02-13
影响因子：
11.1
作者：
Chippindale, AK;Gibson, JR;Rice, WR
通讯作者：
Rice, WR
DOI：
10.1111/j.1471-8286.2005.01022.x
发表时间：
2005-09-01
期刊：
MOLECULAR ECOLOGY NOTES
影响因子：
--
作者：
Gunn, MR;Dawson, DA;Coltman, DW
通讯作者：
Coltman, DW