Dietary plasticity of North American herbivores: a synthesis of stable isotope data over the past 7 million years.
Dietary plasticity of North American herbivores: a synthesis of stable isotope data over the past 7 million years.
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DOI：
10.1098/rspb.2021.0121
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发表时间：
2021-04-14
期刊：
影响因子：
--
通讯作者：
DeSantis LRG
中科院分区：
文献类型：
--
作者：
Pardi MI;DeSantis LRG
古生态学的解释是基于我们对化石分类群的饮食和栖息地偏好的理解。虽然形态学提供了饮食的近似值，但稳定的同位素代理提供了对动物实现饮食的见解。本文对北美食草哺乳动物近7 Ma以来的同位素生态（牙釉质δ13C）进行了综合。我们的问题是：(i)饮食行为的形态学解释是否与稳定同位素代用数据一致？（ii）是放牧分类群的专家，还是放牧是扩大饮食生态位的一种手段？（iii）如何在局部水平上获得分类群的饮食生态位宽度？研究表明，虽然近齿目动物是专门的浏览者，但次齿目动物的饮食范围通常更广，包括比之前预期更多的浏览消费。长期以来，人们一直认为形态对饮食有限制；这种综合支持了先前的研究，即具有“放牧”适应性的食草动物，如下齿动物，有能力吃草，但也能吃其他食物。值得注意的是，即使是多面手的分类群，其局域饮食宽度也可能很窄(约为。占分类单元总宽度的30 - 60%)。这一综合表明，“适应放牧”的分类群在不同的空间和时间里有不同的饮食，这种灵活性可能会减少古代食草动物之间的竞争。
Palaeoecological interpretations are based on our understanding of dietary and habitat preferences of fossil taxa. While morphology provides approximations of diets, stable isotope proxies provide insights into the realized diets of animals. We present a synthesis of the isotopic ecologies (δ13C from tooth enamel) of North American mammalian herbivores since approximately 7 Ma. We ask: (i) do morphological interpretations of dietary behaviour agree with stable isotope proxy data? (ii) are grazing taxa specialists, or is grazing a means to broaden the dietary niche? and (iii) how is dietary niche breadth attained in taxa at the local level? We demonstrate that while brachydont taxa are specialized as browsers, hypsodont taxa often have broader diets that included more browse consumption than previously anticipated. It has long been accepted that morphology imposes limits on the diet; this synthesis supports prior work that herbivores with ‘grazing’ adaptions, such as hypsodont teeth, have the ability to consume grass but are also able to eat other foods. Notably, localized dietary breadth of even generalist taxa can be narrow (approx. 30 to 60% of a taxon's overall breadth). This synthesis demonstrates that ‘grazing-adapted’ taxa are varied in their diets across space and time, and this flexibility may reduce competition among ancient herbivores.
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影响因子：
10
作者：
Damuth, John;Janis, Christine M.
通讯作者：
Janis, Christine M.
影响因子：
3.2
作者：
GRINE, FE
通讯作者：
GRINE, FE
DOI：
10.1073/pnas.97.14.7899
发表时间：
2000-07-05
影响因子：
11.1
作者：
Janis, CM;Damuth, J;Theodor, JM
通讯作者：
Theodor, JM
DOI：
10.1073/pnas.1004933107
发表时间：
2010-11-16
影响因子：
11.1
作者：
Kohn, Matthew J.
通讯作者：
Kohn, Matthew J.
影响因子：
56.9
作者：
Gill, Jacquelyn L.;Williams, John W.;Robinson, Guy S.
通讯作者：
Robinson, Guy S.