Seasonal dietary changes increase the abundances of savanna herbivore species.

Seasonal dietary changes increase the abundances of savanna herbivore species.
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DOI:
10.1126/sciadv.abd2848
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发表时间:
2020-10
期刊:
影响因子:
13.6
通讯作者:
Hempson GP
Hempson GP
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Staver AC;Hempson GP

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季节性迁移或改变饮食的非洲稀树草原食草动物比它们的专业同行数量更多。非洲稀树草原是世界上最后一个大型巨型动物群落的家园,但尽管人口持续下降,我们对稀树草原食草动物丰度的限制知之甚少。季节性的饮食变化(除了迁移)很少受到关注,尽管可能的饮食策略的多样性。在这里,我们首先制定两个理论模型,预测混合喂养和迁徙放牧增加人口规模。这些预测在非洲稀树草原公园的综合数据中得到了证实:混合饲养者是非洲最丰富的食草动物,还有一些迁徙的食草动物种群。总的来说,明显的混合饲养优势可能反映了一种历史模式,也可能反映了全球专家的普遍下降。无论如何,混合饲养者主宰了现在和未来的热带稀树草原。
African savanna herbivores that migrate or change diets seasonally are more populous than their specialist counterparts. African savannas are home to the world’s last great megafaunal communities, but despite ongoing population declines, we only poorly understand the constraints on savanna herbivore abundances. Seasonal diet shifts (except migration) have received little attention, despite a diversity of possible dietary strategies. Here, we first formulate two theoretical models that predict that both mixed feeding and migratory grazing increase population sizes. These predictions are borne out in comprehensive data across African savanna parks: Mixed feeders are the most abundant herbivores in Africa, alongside a few migratory grazer populations. Overall, clear mixed-feeder dominance may reflect a historical pattern or may instead mirror a general global decline in specialists. Regardless, mixed feeders dominate the savannas of the present and future.
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