Effect of Family Support on the Success of Translocated Black- Tailed Prairie Dogs Kelly Finnegan.

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Presentation transcript:

Effect of Family Support on the Success of Translocated Black- Tailed Prairie Dogs Kelly Finnegan

Black-Tailed Prairie Dogs

Purpose Black-tailed Prairie dog –Keystone species in grassland ecosystem –Declined 98% in Great Plains Overhunting Habitat shortage Colony fragmentation –Candidate for listing under Endangered Species Act Translocation –Supplement small populations –Restore extirpated populations

The Purpose Translocation con’t –Highly unsucessful translocation history 60% mortality rate & sometimes much lower Predation Dispersal Social factors regarding colonial species

The Stuuuuudy Vermejo Park Ranch, New Mexico –10 uninhabited sites within the historical range of Prairie Dog –Match sites for family translocated (FT) and nonfamily translocated (NFT) “484 FT & 489 NFT -> individuals per site Individuals chosen randomly from edge and center of colonies Soft release” via acclimation cages

Measuring Success Retrapping ear-tagged animals and counting the emergent young in the spring –Record deceased individuals from release group –Determine population viability –Dispersed individuals considered deceased because they no longer contribute to the population’s viability

Results Family Translocated –Increased survival chance by 5x –Females had higher reproductive success –Mean number of emergent pups higher than NFT –Survival increased with family size –Behavioral differences (eg. Travel, greetings, play, allogrooming, foraging, & alarm calling –Excavated burrow faster Nonfamily Translocated –Adults had lower survival rates especially females –Females that successfully weaned pups had equal litter size –Predation pressure significantly decreased survival –Behavioral differences (eg disorientation, extended travel) –Higher # of vigilant individuals

Discussion Results suggest that any species dependent upon social interactions for survival and reproduction may benefit substantially from the maintenance of social groups during translocation… Shier, D.M. (2006) Effect of Family Support on the Success of Translocated Black-Tailed Prairie Dogs Conservation Biology Vol. 20 No.6 : p