Price Trevor
Division of Biological Sciences, The University of Michigan, 4810-1048, Ann Arbor, MI, USA.
Oecologia. 1985 Jun;66(3):411-416. doi: 10.1007/BF00378307.
I show how food shortage affects reproduction in a population of Darwin's Medium Ground Finches, Geospiza fortis. Despite the common occurrence of starvation and absence of nest predation, hatching is typically nighly synchronous and adaptive brood reductionappears to be absent. Variation in both growth rates and clutch size in association with the varying conditions is documented. This variation is interpreted as being a direct response to environmental conditions rather than adaptive phenotypic plasticity. I conclude that selection pressures to raise one or two chicks during times of food shortage, or to delay growth rates, are weak or absent.
我展示了食物短缺如何影响达尔文中型地雀（Geospiza fortis）种群的繁殖。尽管饥饿普遍存在且没有巢捕食现象，但孵化通常是近乎同步的，而且似乎不存在适应性的育雏减少现象。记录了与不同条件相关的生长速率和窝卵数的变化。这种变化被解释为对环境条件的直接反应，而不是适应性表型可塑性。我得出结论，在食物短缺时期养育一两只雏鸟或延迟生长速率的选择压力很弱或不存在。
