37 research outputs found
Drivers of extinction risk in African mammals: the interplay of distribution state, human pressure, conservation response and species biology
Nutrient contents of three commonly consumed fruits of lowe’s monkey (Cercopithecus campbelii lowei)
Fences can support restoration of human-dominated ecosystems when rewilding with large predators
The use of fences in conservation can be controversial, as artificial barriers constrain natural behaviour and ecological dynamics. However, in the case of large predators inhabiting protected areas within a hostile human-dominated landscape, predators may remain at low densities if they face high mortality upon leaving the reserve. In turn, this may compromise the potential for density-dependent effects such as top-down regulation of prey species abundance. We simulate the hypothetical reintroduction of gray wolves Canis lupus to reserves in their former range (Scottish Highlands), with the objectives of identifying parameters that allow a viable wolf population and the potential for direct top-down forcing of red deer Cervus elaphus densities. We examine the extent to which the number of dispersing wolves leaving the protected area influences whether these objectives are achieved. Our simulations confirm that source-sink population dynamics can result in a self-perpetuating wolf population, but one that never achieves densities needed for strong top-down forcing. When wolf density is weakly controlled by intraspecific competition, strong top-down forcing occurs when 20% of dispersing wolves or less leave the population. When 20% to 35% of dispersing wolves leave, the strength of top-down forcing is highly variable. The wolf population remained viable when 35% to 60% of dispersing wolves left, but then did not exert strong top-down forcing. Wolves were vulnerable to extinction at greater than 60% disperser loss. Despite their negative connotations, fences (including semi-permeable ones) could increase the potential for interspecific density-dependent processes in some cases, thereby facilitating trophic rewilding
Wild cats
SIGLEAvailable from British Library Document Supply Centre- DSC:95/19702 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Raccoons and their relatives
SIGLEAvailable from British Library Document Supply Centre- DSC:95/19701 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Seals
SIGLEAvailable from British Library Document Supply Centre- DSC:95/19703 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Conservation biology of Lycaenidae (butterflies)
SIGLEAvailable from British Library Document Supply Centre- DSC:6217.4791(IUCN-SSC-OP--8) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
The 1996 red list of threatened animals
SIGLEAvailable from British Library Document Supply Centre-DSC:4588.854(1996) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Polar bears Proceedings of the eleventh Working Meeting of the IUCN/SSC Polar Bear Specialist Group 25-27 January 1993, Copenhagen, Denmark
SIGLEAvailable from British Library Document Supply Centre- DSC:6217.4791(IUCN-SSC-OP--10) / BLDSC - British Library Document Supply CentreGBUnited Kingdo