| the role of predation in the decline and extirpation of woodland caribou. | to select appropriate recovery strategies for endangered populations, we must understand the dynamics of small populations and distinguish between the possible causes that drive such populations to low numbers. it has been suggested that the pattern of population decline may be inversely density-dependent with population growth rates decreasing as populations become very small; however, empirical evidence of such accelerated declines at low densities is rare. here we analyzed the pattern of decl ... | 2005 | 15891849 |
| geographic distribution of the muscle-dwelling nematode parelaphostrongylus odocoilei in north america, using molecular identification of first-stage larvae. | molecular identification of dorsal-spined larvae (dsl) from fecal samples indicates that the protostrongylid parasite parelaphostrongylus odocoilei occupies a broader geographic range in western north america than has been previously reported. we analyzed 2,124 fecal samples at 29 locations from thinhorn sheep (ovis dalli dalli and o. d. stonei), bighorn sheep (ovis canadensis canadensis and o. c. californiana), mountain goats (oreamnos americanus), woodland caribou (rangifer tarandus caribou), ... | 2005 | 16108550 |
| changes in landscape composition influence the decline of a threatened woodland caribou population. | 1. large-scale habitat loss is frequently identified with loss of biodiversity, but examples of the direct effect of habitat alterations on changes in vital rates remain rare. quantifying and understanding the relationship between habitat composition and changes in vital rates, however, is essential for the development of effective conservation strategies. 2. it has been suggested that the decline of woodland caribou rangifer tarandus caribou populations in north america is precipitated by timbe ... | 2007 | 17439473 |
| serum biochemistry, serology, and parasitology of boreal caribou (rangifer tarandus caribou) in the northwest territories, canada. | boreal caribou (rangifer tarandus caribou) are an ecologically and culturally important wildlife species and now range almost exclusively in the boreal forests of canada, including the northwest territories, northern alberta, and british columbia. boreal caribou are threatened throughout their canadian range because of direct and indirect natural and anthropogenic factors. in the northwest territories, however, they have a continuous range that overall has not yet been subjected to the same degr ... | 2010 | 20966261 |
| conservation strategies for species affected by apparent competition. | apparent competition is an indirect interaction between 2 or more prey species through a shared predator, and it is increasingly recognized as a mechanism of the decline and extinction of many species. through case studies, we evaluated the effectiveness of 4 management strategies for species affected by apparent competition: predator control, reduction in the abundances of alternate prey, simultaneous control of predators and alternate prey, and no active management of predators or alternate pr ... | 2013 | 23282104 |