气候变化领域集成服务门户(CCPortal): Testing the hypothesis of an impoverished predator guild in the Early Miocene ecosystems of Patagonia: An analysis of meat availability and competition intensity among carnivores

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DOI	10.1016/j.palaeo.2020.109805
	Testing the hypothesis of an impoverished predator guild in the Early Miocene ecosystems of Patagonia: An analysis of meat availability and competition intensity among carnivores
	Rodríguez-Gómez G.; Cassini G.H.; Palmqvist P.; Bargo M.S.; Toledo N.; Martín-González J.A.; Muñoz N.A.; Kay R.F.; Vizcaíno S.F.
发表日期	2020
ISSN	0031-0182
卷号	554
英文摘要	The lower Miocene Santa Cruz Formation (dated to ~18–16 Ma) of Southern Patagonia, Argentina, preserves rich vertebrate faunas, which are representative of communities that existed prior to the Great American Biotic Interchange (GABI). Some previous researchers have hypothesized that these pre-GABI faunas had a low richness of mammalian carnivores (an impoverished predator guild), while others argue for a predator/prey ratio similar to those of recent communities. In this paper, we analyze faunas from the lower part of the Santa Cruz Formation (FL 1–7) using a methodology that allows us to quantify (i) the meat resources that were available to the secondary consumers of the palaeocommunity; and (ii) the competition intensity for these resources. In our modeling, we considered different scenarios related to meat consumption, including the possibility that several taxa had a scavenging behavior, and also differences in mortality rates between young and adult prey. Our results provide estimates of the nutritional requirements from the predator/scavenger guild under maximum and minimum quantities of meat offered by the prey community, which indicate the presence of a well-balanced palaeocommunity. Moreover, the competition indices point to a relatively high level of competition for prey of small-to-medium size, although competition for resources from large mammal prey was rather low. This suggests that the predator/scavenger guild was not impoverished, although there were insufficient carnivore species to fully consume the megaherbivore biomass. © 2020 Elsevier B.V.
英文关键词	Burdigalian; Competition intensity; Food web; Predator/scavenger guild; Santa Cruz Formation
语种	英语
scopus关键词	carnivore; hypothesis testing; mammal; meat; Miocene; mortality; paleobiology; predator; predator-prey interaction; Argentina; Patagonia; Santa Cruz [Argentina]; Mammalia; Vertebrata
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150442
作者单位	Departamento de Ecología y Geología, University of Malaga, Campus de Teatinos, Malaga, 29071, Spain; División Mastozoología, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Av. Ángel Gallardo 470, C1405DJR, Ciudad Autónoma de Buenos Aires, Argentina; Departamento de Ciencias Básicas, Universidad Nacional de Luján, Ruta 5 y Av. Constitución s/n, Luján, Buenos Aires 6700, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina; División Paleontología Vertebrados, Museo de La Plata, Unidades de Investigación Anexo Museo, Facultad de Ciencias Naturales y Museo, Av. 60 y 122, La Plata, 1900, Argentina; Comisión de Investigaciones Científicas (CIC) provincia de Buenos Aires, Argentina; Departamento de Matemáticas y Computación, University of Burgos, Plaza Misael Bañuelos s/n, Burgos, 09001, Spain; Department of Evolutionary Anthropology and Division of Earth and Ocean Sciences, Duke University, Durham, United States
推荐引用方式 GB/T 7714	Rodríguez-Gómez G.,Cassini G.H.,Palmqvist P.,et al. Testing the hypothesis of an impoverished predator guild in the Early Miocene ecosystems of Patagonia: An analysis of meat availability and competition intensity among carnivores[J],2020,554.
APA	Rodríguez-Gómez G..,Cassini G.H..,Palmqvist P..,Bargo M.S..,Toledo N..,...&Vizcaíno S.F..(2020).Testing the hypothesis of an impoverished predator guild in the Early Miocene ecosystems of Patagonia: An analysis of meat availability and competition intensity among carnivores.Palaeogeography, Palaeoclimatology, Palaeoecology,554.
MLA	Rodríguez-Gómez G.,et al."Testing the hypothesis of an impoverished predator guild in the Early Miocene ecosystems of Patagonia: An analysis of meat availability and competition intensity among carnivores".Palaeogeography, Palaeoclimatology, Palaeoecology 554(2020).