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首页> 外文期刊>Oecologia >Rain, prey and predators: climatically driven shifts in frog abundance modify reproductive allometry in a tropical snake
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Rain, prey and predators: climatically driven shifts in frog abundance modify reproductive allometry in a tropical snake

机译：雨水，猎物和捕食者：青蛙丰度的气候变化改变了热带蛇的生殖变态

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摘要

To predict the impacts of climate change on animal populations, we need long-term data sets on the effects of annual climatic variation on the demographic traits (growth, survival, reproductive output) that determine population viability. One frequent complication is that fecundity also depends upon maternal body size, a trait that often spans a wide range within a single population. During an eight-year field study, we measured annual variation in weather conditions, frog abundance and snake reproduction on a floodplain in the Australian wet-dry tropics. Frog numbers varied considerably from year to year, and were highest in years with hotter wetter conditions during the monsoonal season (“wet season”). Mean maternal body sizes, egg sizes and post-partum maternal body conditions of frog-eating snakes (keelback, Tropidonophis mairii, Colubridae) showed no significant annual variation over this period, but mean clutch sizes were higher in years with higher prey abundance. Larger females were more sensitive to frog abundance in this respect than were smaller conspecifics, so that the rate at which fecundity increased with body size varied among years, and was highest when prey availability was greatest. Thus, the link between female body size and reproductive output varied among years, with climatic factors modifying the relative reproductive rates of larger (older) versus smaller (younger) animals within the keelback population.
机译：为了预测气候变化对动物种群的影响，我们需要有关年度气候变化对决定种群生存力的人口统计特征（生长，生存，繁殖产量）的影响的长期数据集。一种常见的并发症是，生殖力还取决于孕产妇的体型，这一特征通常在单个人群中广泛分布。在一项为期八年的野外研究中，我们在澳大利亚干湿热带地区的洪泛平原上，测量了天气状况，青蛙数量和蛇繁殖量的年度变化。每年的蛙类数量差异很大，并且在季风季节（“湿季”）中较热的湿润条件下的年份最高。吃青蛙的蛇（龙背鱼，Tropidonophis mairii，Colubridae）的平均母体大小，卵大小和产后母体状况在此期间没有显着的年度变化，但是随着猎物丰富度的提高，平均离合器大小在几年中更高。在这方面，较大的雌性比较小的雌性对青蛙的丰度更敏感，因此，随着年龄的增长，繁殖力的增加率随年龄的变化而变化，当猎物的可获得性最大时，生殖力的增长率最高。因此，女性的体型与生殖产量之间的联系随年份变化，气候因素改变了龙骨背种群中较大（较老）与较小（较年轻）动物的相对繁殖率。

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