Wild Bornean orangutan (Pongo pygmaeus wurmbii) feeding rates and the Marginal Value Theorem.,American Journal of Primatology

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Wild Bornean orangutan (Pongo pygmaeus wurmbii) feeding rates and the Marginal Value Theorem.
American Journal of Primatology ( IF 2.0 ) Pub Date : 2020-08-05 , DOI: 10.1002/ajp.23183
Andrea L DiGiorgio _{1,

2} , Elizabeth M Upton _{3,

4} , Tri Wahyu Susanto _{5,

6} , Cheryl D Knott _{2,

6,

7}

Affiliation

The Marginal Value Theorem (MVT) is an integral supplement to Optimal Foraging Theory (OFT) as it seeks to explain an animal's decision of when to leave a patch when food is still available. MVT predicts that a forager capable of depleting a patch, in a habitat where food is patchily distributed, will leave the patch when the intake rate within it decreases to the average intake rate for the habitat. MVT relies on the critical assumption that the feeding rate in the patch will decrease over time. We tested this assumption using feeding data from a population of wild Bornean orangutans (Pongo pygmaeus wurmbii) from Gunung Palung National Park. We hypothesized that the feeding rate within orangutan food patches would decrease over time. Data included feeding bouts from continuous focal follows between 2014 and 2016. We recorded the average feeding rate over each tertile of the bout, as well as the first, midpoint, and last feeding rates collected. We did not find evidence of a decrease between first and last feeding rates (Linear Mixed Effects Model, n = 63), between a mid‐point and last rate (Linear Mixed Effects Model, n = 63), between the tertiles (Linear Mixed Effects Model, n = 63), nor a decrease in feeding rate overall (Linear Mixed Effects Model, n = 146). These findings, thus, do not support the MVT assumption of decreased patch feeding rates over time in this large generalist frugivore.

中文翻译：

野生婆罗洲猩猩（Pongo pygmaeus wurmbii）摄食率和边际价值定理。

边际价值定理（MVT）是对最佳觅食理论（OFT）的完整补充，旨在解释动物在仍有食物时决定何时放下补丁的决定。MVT预测，在零星分布食物的栖息地中，能够耗尽斑块的觅食者，当其中的摄入量降低至该栖息地的平均摄入量时，就会离开斑块。MVT的关键假设是贴剂的进料速度会随着时间的推移而降低。我们使用野生婆罗洲猩猩（Pongo pygmaeus wurmbii），来自古隆帕龙国家公园。我们假设猩猩食物片中的喂食速度会随着时间的推移而降低。数据包括2014年至2016年间连续关注的进食次数。我们记录了每三分位数的平均进食速度以及收集的第一，中点和最后进食速度。我们没有找到姓氏和投饲率之间的下降的证据（线性混合效应模型，ñ = 63），中点和去年率（线性混合效应模型之间ñ = 63），在三分位之间（线性混合效果模型，n = 63），总体上也不降低喂食速度（线性混合效果模型，n = 146）。因此，这些发现不支持MVT假设，即在这种大型的通才食肉动物中，贴剂的喂食速度会随着时间的推移而降低。

更新日期：2020-09-20

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