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Journal article
Behavior, growth, and survivorship of laboratory-reared juvenile gopher tortoises following hard release
Endangered species research, v 40
01 Jan 2019
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Captive rearing represents a vital component of many conservation and research programs. However, captive animals can exhibit unnatural behaviors and experience high predation following release, which can limit reintroduction success and the inferential value of studies that use released animals. Soft-release measures (e.g. penning) can acclimate individuals and limit interactions with predators but can also require considerable resources. We reared hatchling gopher tortoises Gopherus polyphemus in the laboratory for physiology experiments and subsequently hard-released them as yearlings to assess the efficacy of this low-cost release method and to explore possible captivity effects on tortoise behavior, growth, and survivorship. Hard-released yearlings exhibited limited dispersal; most constructed burrows soon after release, and, like wild juveniles, exhibited a preference for burrowing under deadwood. Video observations at burrows indicated natural behavior, including overnighting in burrows, extensive basking directly in front of burrows, and limited time away from these important refugia. Basking tortoises responded to simulated predator approach by rapidly entering burrows, with flight initiation distances and hiding times equivalent or similar to those of wild individuals. Survivorship was comparable to that of soft-released juveniles, but growth was slightly lower than expected based on observations of wild tortoises at the site, possibly reflecting performance immediately following release. Our findings indicate that captive-reared juvenile gopher tortoises respond well to hard release and exhibit natural attributes required to thrive in the wild. Moreover, studies of released juveniles can yield valuable insights into the ecology of a life stage that is poorly understood in most chelonians.
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Details
- Title
- Behavior, growth, and survivorship of laboratory-reared juvenile gopher tortoises following hard release
- Creators
- Thomas A. Radzio - Drexel Univ, Dept Biodivers Earth & Environm Sci, Philadelphia, PA 19104 USANicholas J. Blase - Drexel Univ, Dept Biodivers Earth & Environm Sci, Philadelphia, PA 19104 USAJames A. Cox - Tall Timbers Res Stn & Land Conservancy, Tallahassee, FL 32312 USADavid K. Delaney - US Army Construct Engn Res Lab, Champaign, IL 61822 USAMichael P. O'Connor - Drexel University
- Publication Details
- Endangered species research, v 40
- Publisher
- Inter-Research
- Number of pages
- 13
- Grant note
- Land Conservancy United States Army Construction Engineering Research Laboratory McLean Fellowship in Ornithology and Environmental Science Tall Timbers Research Station Claudio Elia Memorial Fellowship in Environmental Science Wade Tract Research Endowment Betz Chair Endowment in Environmental Science at Drexel University
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES)
- Web of Science ID
- WOS:000498860000002
- Scopus ID
- 2-s2.0-85089027436
- Other Identifier
- 991019168530204721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Biodiversity Conservation