Dietary abundance distributions: Dominance and diversity in vertebrate diets
Dietary abundance distributions: Dominance and diversity in vertebrate diets
复制标题
饮食丰度分布：脊椎动物饮食的优势和多样性
DOI：
10.1111/ele.13948
复制
发表时间：
2021
期刊：
影响因子：
8.8
通讯作者：
Chase, ed., Jonathan
中科院分区：
文献类型：
--
作者：
Hutchinson, Matthew C.;Dobson, Andrew P.;Pringle, Robert M.;Chase, ed., Jonathan
饮食组成是动物生态学中最重要但最不为人所知的方面之一。受物种丰度分布（SAD）研究的启发，我们通过将其表征为膳食丰度分布（DADs）来测试脊椎动物膳食结构中的共性。我们收集了1167个种群水平的饮食数据，代表了来自六个脊椎动物纲的500多个物种，跨越了所有大陆和海洋。DAD几乎普遍（92.5%）遵循空心曲线形状，缺乏对其他合理秩-丰度-分布形状的支持。这种强烈的普遍性是内在相关的，但不完全解释，SAD可用的食物类群。通过将饮食泛化量化为饮食丰度累积分布的半饱和点（sp 50，占饮食50%所需的最小食物数量），我们发现脊椎动物种群令人惊讶地专业化：在大多数种群中，少于三种食物占至少一半的饮食。变异1050与消费者类型密切相关，食肉动物比食草动物或杂食动物更专业化。其他方法（采样方法和努力，分类分辨率），生物（体重，frugivory）和地理（纬度）因素影响sp 50不同程度。未来的挑战包括确定中空曲线DAD的基础机制，其普遍性超出脊椎动物，以及饮食泛化的生物决定因素。
Diet composition is among the most important yet least understood dimensions of animal ecology. Inspired by the study of species abundance distributions (SADs), we tested for generalities in the structure of vertebrate diets by characterising them as dietary abundance distributions (DADs). We compiled data on 1167 population‐level diets, representing >500 species from six vertebrate classes, spanning all continents and oceans. DADs near‐universally (92.5%) followed a hollow‐curve shape, with scant support for other plausible rank‐abundance‐distribution shapes. This strong generality is inherently related to, yet incompletely explained by, the SADs of available food taxa. By quantifying dietary generalisation as the half‐saturation point of the cumulative distribution of dietary abundance (sp50, minimum number of foods required to account for 50% of diet), we found that vertebrate populations are surprisingly specialised: in most populations, fewer than three foods accounted for at least half the diet. Variation insp50was strongly associated with consumer type, with carnivores being more specialised than herbivores or omnivores. Other methodological (sampling method and effort, taxonomic resolution), biological (body mass, frugivory) and biogeographic (latitude) factors influencedsp50to varying degrees. Future challenges include identifying the mechanisms underpinning the hollow‐curve DAD, its generality beyond vertebrates, and the biological determinants of dietary generalisation.