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Body mass‐related changes in mammal community assembly patterns during the late Quaternary of North America
Ecography ( IF 5.9 ) Pub Date : 2020-10-08 , DOI: 10.1111/ecog.05027
Silvia Pineda‐Munoz 1, 2, 3 , Advait M. Jukar 2 , Anikó B. Tóth 2, 4 , Danielle Fraser 2, 5, 6 , Andrew Du 7 , W. Andrew Barr 2, 8 , Kathryn L. Amatangelo 9 , Meghan A. Balk 10 , Anna K. Behrensmeyer 2 , Jessica Blois 11 , Matt Davis 12 , Jussi T. Eronen 13, 14 , Nicholas J. Gotelli 15 , Cindy Looy 16 , Joshua H. Miller 17 , Alexandria B. Shupinski 18 , Laura C. Soul 2 , Amelia Villaseñor 19 , Scott Wing 3 , S. Kathleen Lyons 18
Affiliation  

The late Quaternary of North America was marked by prominent ecological changes, including the end‐Pleistocene megafaunal extinction, the spread of human settlements and the rise of agriculture. Here we examine the mechanistic reasons for temporal changes in mammal species association and body size during this time period. Building upon the co‐occurrence results from Lyons et al. (2016) – wherein each species pair was classified as spatially aggregated, segregated or random – we examined body mass differences (BMD) between each species pair for each association type and time period (Late Pleistocene: 40 000 14C–11 700 14C ybp, Holocene: 11 700 14C–50 ybp and Modern: 50–0 yr). In the Late Pleistocene and Holocene, the BMD of both aggregated and segregated species pairs was significantly smaller than the BMD of random pairs. These results are consistent with environmental filtering and competition as important drivers of community structure in both time periods. Modern assemblages showed a breakdown between BMD and co‐occurrence patterns: the average BMD of aggregated, segregated and random species pairs did not differ from each other. Collectively, these results indicate that the late Quaternary mammalian extinctions not only eliminated many large‐bodied species but were followed by a re‐organization of communities that altered patterns of species coexistence and associated differences in body size.

中文翻译:

北美第四纪晚期哺乳动物群落组装模式中与体重有关的变化

北美第四纪晚期以明显的生态变化为特征,包括更新世末期的大型动物灭绝,人类住区的扩散和农业的兴起。在这里,我们研究了这段时间内哺乳动物物种关联和体型随时间变化的机械原因。基于Lyons等人的共现结果。(2016)–其中每个物种对被分类为空间聚集,分离或随机–我们检查了每个物种对之间每个体型和时期的体重差异(晚更新世:40 000 14 C–11 700 14 C ybp,全新世:11 700 14C–50 ybp和现代:50–0年)。在晚更新世和全新世,聚集和分离物种对的BMD显着小于随机对的BMD。这些结果与环境过滤和竞争一致,这两个时期都是社区结构的重要驱动力。现代组合显示出BMD和共现模式之间的细目:聚集,分离和随机物种对的平均BMD互不相同。总体而言,这些结果表明,第四纪晚期哺乳动物的灭绝不仅消除了许多大型物种,而且还重新组织了群落,从而改变了物种共存的格局以及相关的体型差异。
更新日期:2020-10-08
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