Life span in Beta vulgaris ssp maritima:: the effects of age at first reproduction and disturbance
Life span in Beta vulgaris ssp maritima:: the effects of age at first reproduction and disturbance
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DOI：
10.1046/j.1365-2745.2002.00688.x
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发表时间：
2002-06-01
影响因子：
5.5
通讯作者：
Van Dijk, H
中科院分区：
文献类型：
--
作者：
Hautekèete, NC;Piquot, Y;Van Dijk, H
寿命是健康的一个重要组成部分，它可以受到诸如初次繁殖年龄等特征的影响，也可以受到环境施加的死亡率制度的影响。在控制条件下的长期实验中，我们研究了海甜菜（Beta vulgaris）的寿命。海苔（L.），取自法国、比利时、英国和荷兰的104个野生种群。我们估计了选择压力对寿命的强度，以及首次繁殖年龄（第一年或第二年，取决于春化要求）和环境干扰的具体影响平均寿命（在温室条件下测量）随着纬度的增加而增加，从法国西南部内陆栖息地的约2年增加到布列塔尼北部的至少1.1年，然后在最北部的种群中减少到约5年寿命与细胞质中性标记的空间自相关图比较表明，寿命具有较强的选择性在种群中，初次生育年龄对寿命的影响被证明是微乎其微的。虽然在研究区域的南部，第一年的繁殖和较短的寿命之间有很强的联系，但在种群之间没有发现因果关系，这表明存在普遍的选择压力寿命似乎与由死亡率制度定义的生境类型高度相关。个体寿命最长的种群出现在最稳定的生境，而个体寿命最短的种群出现在最受干扰的生境。
1 Life span, an essential component of fitness, can be affected by traits such age at first reproduction, as well as by the mortality regime imposed by the environment. In a long-term experiment under controlled conditions, we studied life span in an iteroparous plant species, the sea beet Beta vulgaris ssp. maritima (L.), from 104 wild populations sampled in France, Belgium, Great Britain and the Netherlands. We estimated the intensity of selective pressures on life span and the specific effects of age at first reproduction (first or second year, depending on vernalization requirement) and of environmental disturbance.2 Mean life span (measured in glasshouse conditions) increases with latitude from about 2 years in inland habitats of south-western France to at least I I years in north Brittany, before decreasing to about 5 years in the northernmost populations.3 Comparison of spatial autocorrelograms for life span and cytoplasmic neutral markers showed there is strong selection for fife span.4 Within populations the effect of age at first reproduction on life span proved to be marginal. No causal relationship was detected among populations, although, in the southern part of the study area, a strong association between reproduction in the first year and short life span suggests common selective pressures.5 Life span appeared to be highly associated with habitat type, as defined by mortality regimes. Populations with the longest-lived individuals occurred in the most stable habitats and populations with the shortest-lived individuals in the most disturbed locations.