期刊
GLOBAL ECOLOGY AND CONSERVATION
卷 22, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.gecco.2020.e00920
关键词
Apparent competition; Incidental predators; Landscape ecology; Rangifer tarandus caribou; Variance partitioning; Vital rates
资金
- Fonds de Recherche du Quebec e Nature et Technologies (FRQNT)
- Ministere des Forets, de la Faune et des Parcs
- Canada Foundation for Innovation (John R. Evans Leaders Fund Grant) [26442]
- Natural Sciences and Engineering Research Council of Canada (NSERC) [386661-2010, 2016-05196]
- Societe des Etablissements de Plein Air du Quebec
- Fondation de la Faune du Quebec
- Consortium en foresterie Gaspesie-Les-Iles
- Universite du Quebec a Rimouski (Fonds Institutionnel de Recherche)
- EnviroNorth (NSERC-CREATE) scholarship
Habitat loss, fragmentation and alteration are frequently identified as important threats to biodiversity, inducing major changes in the structure and composition of species communities and the resulting interspecific interactions. North American woodland caribou (Rangifer tarandus caribou) populations suffer from habitat modifications and most are currently in decline. It has been suggested that the conversion of old-growth coniferous forests into early-seral stages has increased cervid abundances, which have, in turn, stimulated a numerical response of predator populations, ultimately threatening caribou populations via a habitat-mediated apparent competition mechanism. Using a long-term dataset (1984-2012) of the Atlantic-Gaspesie caribou population, we quantified changes in interspecific interactions triggered by apparent competition between moose (Alces americanus) and caribou via the responses of two incidental predators, coyote (Canis latrans) and black bear (Ursus americanus). We also documented calf recruitment rates and analysed temporal trends (last three decades) in this vital rate. Inter-annual variations in autumn calf recruitment were mostly affected by the proxy of regional abundance of coyotes, which was highly correlated with moose and black bear proxies of abundance. The increase in coyote abundance proxy in the Gaspesie Peninsula following anthropogenic habitat modifications seems to be the main mechanism responsible for the current decline in the Atlantic-Gaspesie caribou population. Our analyses revealed some impacts of habitat alteration and the complexity of the resulting trophic cascades. (C) 2020 The Authors. Published by Elsevier B.V.
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