Title: Post‐release movement and survivorship of head‐started gopher tortoises

Abstract

ABSTRACT Gopher tortoise ( Gopherus polyphemus ) populations are declining throughout their range and recovery requires management intervention to alleviate losses. Population augmentation strategies may prove useful in recovery of depleted populations once threats are mitigated. We head‐started and soft‐released hatchlings produced from robust donor populations and evaluated their post‐release survivorship and movement for the first year following their release. During 2014 and 2015, we head‐started and released 145 tortoises, of which we radio‐tracked a subset of 41 individuals, from 2 cohorts at 2 release areas within Yuchi Wildlife Management Area in Burke County, Georgia, USA. Movement and mortality of gopher tortoises was highest in the first month after release but declined soon after. Estimated annual survivorship of our first cohort was 60.6%. Annual survivorship of our second cohort was low (7.1%) at the southeast release area but much higher (75.0%) at the northwest release area because of spatial variation in predation. Although survivorship was variable, site fidelity remained high throughout the study and no tortoise moved >122.0 m from its release location. Initial results suggest that head‐starting could prove effective as a population recovery tool, but that release strategy and predator mitigation, especially within the first month, are critical tomore » success. © 2018 The Wildlife Society.« less

Authors:

Quinn, Daniel P. ^[1]; Buhlmann, Kurt A. ^[1]; Jensen, John B. ^[2]; Norton, Terry M. ^[3]; Tuberville, Tracey D. ^[1]

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+ Show Author Affiliations

1. University of Georgia Savannah River Ecology Laboratory Drawer E Aiken SC 29802 USA
2. Georgia Department of Natural Resources Wildlife Resources Division 116 Rum Creek Drive Forsyth GA 31029 USA
3. St. Catherines Island Foundation 182 Camelia Road Midway GA 31320 USA

Publication Date:

Sun Aug 12 00:00:00 EDT 2018

Sponsoring Org.:

USDOE

OSTI Identifier:

1464283

Grant/Contract Number:  

DE‐FC09‐07SR22506

Resource Type:

Publisher's Accepted Manuscript

Journal Name:

Journal of Wildlife Management

Additional Journal Information:

Journal Name: Journal of Wildlife Management Journal Volume: 82 Journal Issue: 7; Journal ID: ISSN 0022-541X

Publisher:

Wiley Blackwell (John Wiley & Sons)

Country of Publication:

United States

Language:

English