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Effect of group size on feeding rate when patches are exhaustible.

机译：斑块耗尽时，小组人数对进食速度的影响。

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摘要

One benefit of group foraging is that individual foragers can join the food discoveries of companions and thus increase encounter rate with food patches. When food patches are exhaustible, however, individual shares of each patch will decrease with group size negating the effect of increased encounter rate. Mean feeding rate may actually decrease with group size as a result of aggression or time wasted joining already depleted patches, or when searching to join the food discoveries of others, which is referred to as scrounging, precludes finding food. I examined the relationship between mean feeding rate and group size in captive flocks of zebra finches (Taenopygia guttata) foraging for small clumps of seeds. Finches in groups of two or four fared better than solitary birds in terms of mean feeding rate despite the fact that birds in groups scrounged a large proportion of their food. Solitary birds initiated feeding activity after a longer delay, which led to their lower success. Early departures by food finders from food patches joined by others may have lessened the impact of scrounging on mean feeding rate. As a result of benefits from the presence of companions, group foraging in zebra finches appears a viable alternative to foraging alone despite the cost of sharing resources.
机译：集体觅食的好处之一是个体觅食者可以加入同伴的食物发现，从而增加与食物块的相遇率。但是，当食物块可用完时，每个块的单独份额将随着组的大小而减少，从而抵消了增加遭遇率的影响。平均进食率实际上可能由于侵略或浪费时间加入已经枯竭的斑块而导致群体规模下降，或者当寻找加入其他人的食物发现时，这被称为“缩”，因此无法寻找食物。我检查了圈养斑马雀（Taenopygia guttata）觅食小块种子的平均进食率与群体大小之间的关系。尽管有成组的鸟类ed缩了大部分食物，但在平均进食率方面，两到四只的雀科的表现要比独居的鸟类好。孤独的鸟类经过较长时间的延迟才开始进食，这导致它们的成功率较低。寻食者早日离开其他人加入的食物补丁可能减轻了粗壮对平均摄食率的影响。由于有同伴的出现，尽管共享资源的成本高涨，但斑马雀的集体觅食似乎是单独觅食的可行选择。

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  • 来源
    《Ethology》 |2007年第1期|共5页
  • 作者

    Beauchamp G;

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  • 正文语种 eng
  • 中图分类 动物学;
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