Holand H, Kvalnes T, Gamelon M, Tufto J, Jensen H, Pärn H, Ringsby T H, Sæther B-E
Department of Biology, Centre for Biodiversity Dynamics, Norwegian University of Science and Technology (NTNU), 7491, Trondheim, Norway.
Department of Mathematics, Centre for Biodiversity Dynamics, Norwegian University of Science and Technology (NTNU), 7491, Trondheim, Norway.
Oecologia. 2016 Jul;181(3):865-71. doi: 10.1007/s00442-016-3615-4. Epub 2016 Mar 31.
Investigating factors which affect the decline in survival with age, i.e. actuarial senescence, is important in order to understand how demographic rates vary in wild populations. Although the evidence for the occurrence of actuarial senescence in wild populations is growing, very few studies have compared actuarial senescence rates between wild populations of the same species. We used data from a long-time study of demography of house sparrows (Passer domesticus) to investigate differences in rates of actuarial senescence between habitats and sub-populations. We also investigated whether rates of actuarial senescence differed between males and females. We found that rates of actuarial senescence showed large spatial variation. We also found that the onset of actuarial senescence varied between sub-populations. However, these differences were not significantly explained by a general difference in habitat type. We also found no significant difference in actuarial senescence rates between males and females. This study shows that senescence rates in natural populations may vary significantly between sub-populations and that failing to account for such differences may give a biased estimate of senescence rates of a species.
研究影响随年龄增长生存能力下降的因素，即精算衰老，对于理解野生种群的人口统计学率如何变化至关重要。尽管野生种群中精算衰老发生的证据越来越多，但很少有研究比较同一物种野生种群之间的精算衰老率。我们利用对家麻雀（Passer domesticus）进行的长期种群统计学研究数据，调查不同栖息地和亚种群之间精算衰老率的差异。我们还研究了精算衰老率在雄性和雌性之间是否存在差异。我们发现精算衰老率存在很大的空间变异。我们还发现精算衰老的起始在亚种群之间有所不同。然而，这些差异并不能通过栖息地类型的一般差异得到显著解释。我们还发现雄性和雌性之间的精算衰老率没有显著差异。这项研究表明，自然种群中的衰老率在亚种群之间可能有显著差异，而未能考虑到这些差异可能会对一个物种的衰老率给出有偏差的估计。
