Food limits annual fecundity of a migratory songbird: An experimental study
Food limits annual fecundity of a migratory songbird: An experimental study
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DOI：
10.1890/04-0155
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发表时间：
2005-03-01
期刊：
影响因子：
4.8
通讯作者：
Holmes, RT
中科院分区：
文献类型：
--
作者：
Nagy, LR;Holmes, RT
在短寿命物种中，繁殖力强烈影响种群规模。对于那些在每个繁殖季节有多次繁殖尝试的物种，繁殖力的变化最好用繁殖尝试的次数来解释。对于鸟类来说，多次育雏可能会受到食物供应的影响。在这里，我们报告的食物补充实验的结果，测试的作用，食物作为一种机制，驱动个体之间的变化，在新热带迁徙鸣禽，黑喉蓝莺（Dendroica caerulescens）的频率多育雏。补充喂养的女性产生更多的第二次育雏，花更少的时间觅食和更多的时间闲逛，并留在更接近他们的巢比控制女性。美联储和控制女性没有不同的数量或质量的年轻人从第一次筑巢尝试。补充食物增加了雌性在低食物年和平均食物年中开始第二次育雏的可能性，这表明该种群在大多数年份的繁殖季节食物有限。因此，我们的研究结果表明，食物供应可以强烈影响每年繁殖的候鸟物种繁殖在温带森林，这反过来又会影响每年的招聘率和人口规模。
In short-lived species, fecundity strongly influences population size. For those species with multiple breeding attempts per breeding season, variance in fecundity is best explained by the number of breeding attempts. For birds, multiple brooding may be influenced by food availability. Here, we report results of a food supplementation experiment that tests the role of food as a mechanism driving variation among individuals in the frequency of multiple brooding in a Neotropical migrant songbird, the Black-throated Blue Warbler (Dendroica caerulescens). Supplementally fed females produced more second broods, spent less time foraging and more time loafing, and stayed closer to their nests than did control females. Fed and control females did not differ in the number or mass of young fledged from the first nesting attempt. Supplemental food increased the probability that females would initiate second broods in both a low and an average food year, suggesting that this population is food limited during the breeding season in most years. Our results thus demonstrate that food availability can strongly influence annual fecundity in migratory bird species breeding in temperate forests, which, in turn, affects annual recruitment rates and population size.