Artículos de revistas
Pleistocene Megafaunal Interaction Networks Became More Vulnerable After Human Arrival
Registro en:
Pleistocene Megafaunal Interaction Networks Became More Vulnerable After Human Arrival. Royal Soc, v. 282, p. 64-72 SEP-2015.
0962-8452
WOS:000363361800008
10.1098/rspb.2015.1367
Autor
Pires
Mathias M.; Koch
Paul L.; Farina
Richard A.; de Aguiart
Marcus A. M.; dos Reis
Sergio F.; Guimaraes
Paulo R.
Jr.
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) The end of the Pleistocene was marked by the extinction of almost all large land mammals worldwide except in Africa. Although the debate on Pleistocene extinctions has focused on the roles of climate change and humans, the impact of perturbations depends on properties of ecological communities, such as species composition and the organization of ecological interactions. Here, we combined palaeoecological and ecological data, food-web models and community stability analysis to investigate if differences between Pleistocene and modern mammalian assemblages help us understand why the inegafauna died out in the Americas while persisting in Africa. We show Pleistocene and modern assemblages share similar network topology, but differences in richness and body size distributions made Pleistocene communities significantly more vulnerable to the effects of human arrival. The structural changes promoted by humans in Pleistocene networks would have increased the likelihood of unstable dynamics, which may favour extinction cascades in communities facing extrinsic perturbations. Our findings suggest that the basic aspects of the organization of ecological communities may have played an important role in major extinction events in the past. Knowledge of community-level properties and their consequences to dynamics may be critical to understand past and future extinctions. 282 1814
64 72 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) FAPESP [2006/04682-5, 2009/54422-8, 2009/54567-6]