Decline and Recovery of the Island Fox: A Case Study for by Timothy J. Coonan

By Timothy J. Coonan

Local purely to the California Channel Islands, the island fox is the smallest canid in North the US. Populations on 4 of the islands have been threatened to extinction within the Nineties because of human-mediated predation and affliction. this can be the 1st account of the typical heritage and ecology of the island fox, illustrating either the vulnerability of island ecosystems and the efficacy of cooperative conservation measures. It explains intimately the serious conservation activities required to get well fox populations, resembling captive breeding and reintroduction, and large-scale surroundings manipulation. those activities have been winning due largely to amazing collaboration one of the scientists, managers and public advocates focused on the restoration attempt. The ebook additionally examines the function of a few points of island fox biology, attribute of the 'island syndrome', in facilitating their restoration, together with excessive productiveness and an obvious version to periodic genetic bottlenecks.

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Additional resources for Decline and Recovery of the Island Fox: A Case Study for Population Recovery (Ecology, Biodiversity and Conservation)

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A followup effort in 1975 over a much larger area (88 linear km of transects) resulted in the capture of 55 individuals during 597 trap-nights (Propst 1975). Overall capture success for individuals cannot be compared with Laughrin’s study because the number of recaptures was not documented in the report. Laughrin returned in 1977 and captured zero foxes in 66 trap-nights (Laughrin 1980). These data suggest that in the mid-1970s the fox population on Santa Catalina was much lower than on the other islands, where trap success ranged from 27–67% during the same time period (Laughrin 1980).

The patterns of genetic variation across island fox subspecies reflect the colonization pattern and apparently are influenced, as predicted, by founding time and effective population size. However, the island fox departs from established genetic and conservation models in its apparent persistence at small population sizes, over millennia, despite a relative lack of genetic variation. This is illustrated in the extreme by San Nicolas Island foxes, which are essentially monomorphic at all genetic markers examined save one (Aguilar et al.

Still, island foxes occasionally travel long distances in relation to island area (Roemer et al. 2001b). On San Clemente Island one adult male fox was captured on three different trapping grids within a one-month period, a cumulative distance of more than 9 km, and several other individuals traveled at least 2–3 km in the same season (Schmidt et al. 2005). 4 km over a 2–3-month period (Laughrin 1977). 5 km apart, in a three-week period (Schmidt and Garcelon 2003). 3 Home range Home range size for island foxes is determined by social and resource requirements (Crooks and Van Vuren 1996, Roemer et al.

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