Age structure changes and extraordinary lifespan in wild medfly populations
Age structure changes and extraordinary lifespan in wild medfly populations
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DOI：
10.1111/j.1474-9726.2008.00390.x
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发表时间：
2008-06-01
期刊：
影响因子：
7.8
通讯作者：
Liedo, Pablo
中科院分区：
文献类型：
--
作者：
Carey, James R.;Papadopoulos, Nikos T.;Liedo, Pablo
这项研究的主要目的是检验地中海果蝇野生种群的年龄结构发生重大变化以及相当一部分个体存活到中年及以上(>；3-4周)的假设。因此，我们带来了参考生命表和去卷积模型，以记录从实验室监测到的野外捕获个体的3年研究中收集的蝇类死亡数据。在2003年、2004年和2005年的田间季节，不同采样日期捕获雌虫的平均死亡时间分别相差23.9、22.7和37.0天。平均死亡时间的这些变化为人口年龄结构的变化提供了证据。估计表明，中年蜻蜓(30天)在种群中很常见。这项研究中令人惊讶的是，在野外捕获的蜻蜓身上观察到了非凡的长寿。例如，19只被捕获的雌鼠在实验室中存活了140天或更长时间，6只被捕获但没有参照物的雄鼠在实验室中存活了170天或更长时间。本文通过引入一种估计昆虫种群年龄结构的新方法，推进了野外昆虫种群年龄结构的研究，揭示了野外昆虫种群年龄结构的主要变化，说明了野外中年个体的普遍存在，揭示了野外捕获个体由于早期的野外生活经历而具有非凡的寿命。
The main purpose of this study was to test the hypotheses that major changes in age structure occur in wild populations of the Mediterranean fruit fly (medfly) and that a substantial fraction of individuals survive to middle age and beyond (> 3-4 weeks). We thus brought reference life tables and deconvolution models to bear on medfly mortality data gathered from a 3-year study of field-captured individuals that were monitored in the laboratory. The average time-to-death of captured females differed between sampling dates by 23.9, 22.7, and 37.0 days in the 2003, 2004, and 2005 field seasons, respectively. These shifts in average times-to-death provided evidence of changes in population age structure. Estimates indicated that middle-aged medflies (> 30 days) were common in the population. A surprise in the study was the extraordinary longevity observed in field-captured medflies. For example, 19 captured females but no reference females survived in the laboratory for 140 days or more, and 6 captured but no reference males survived in the laboratory for 170 days or more. This paper advances the study of aging in the wild by introducing a new method for estimating age structure in insect populations, demonstrating that major changes in age structure occur in field populations of insects, showing that middle-aged individuals are common in the wild, and revealing the extraordinary lifespans of wild-caught individuals due to their early life experience in the field.