Multiyear monitoring of survival following mitigation-driven translocation of a long-lived threatened reptile

Brett G Dickson, Rick D. Scherer, Amanda M. Kissel, Bryan P. Wallace, Kathryn M. Langin, Miranda E. Gray, Amanda F. Scheib, Bruce Weise

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Translocation is used by managers to mitigate the negative impacts of development on species. Moving individuals to a new location is challenging, and many translocation attempts have failed. Robust, posttranslocation monitoring is therefore important for evaluating effects of translocation on target species. We evaluated the efficacy of a translocation designed to mitigate the effects of a utility-scale solar energy project on the U.S. federally listed Mojave desert tortoise (Gopherus agassizii). The species is a long-lived reptile threatened by a variety of factors, including habitat loss due to renewable energy development in the Mojave Desert and portions of the Colorado Desert in southern California (southwestern United States). We translocated 58 individual tortoises away from the project's construction site and intensively monitored them over 5 years (2012–2017). We monitored these individuals and tortoises located in the translocation release area (resident tortoises; n = 112) and control tortoises (n = 149) in a nearby location. We used our tortoise encounter data and known-fate survival models to estimate annual and cumulative survival. Translocated tortoises in each of 2 size classes (120–160 mm, >160 mm) did not survive at lower rates than resident and control tortoises over the study period. For models with different sets of biotic and abiotic covariates, annual and cumulative estimates of survival were always >0.87 and >0.56, respectively. Larger tortoises tended to have higher survival, but translocated tortoises were not differentially affected by the covariates used to model variation in survival. Based on these findings, our translocation design and study protocols could inform other translocation projects for desert species. Our case study highlights the benefits of combining rigorous scientific monitoring with well-designed, mitigation-driven management actions to reduce the negative effects of development on species of conservation concern.

Original languageEnglish (US)
JournalConservation Biology
DOIs
StatePublished - Jan 1 2019

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tortoises
reptile
translocation
reptiles
mitigation
monitoring
Gopherus agassizii
desert
Mojave Desert
tortoise
Southwestern United States
solar energy
renewable energy sources
habitat destruction
habitat loss
deserts
managers
case studies

Keywords

  • clima
  • climate
  • conservación
  • conservation
  • desarrollo de energía renovable
  • desert ecosystems
  • ecosistemas desérticos
  • habitat
  • hábitat
  • renewable energy development

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Nature and Landscape Conservation

Cite this

Multiyear monitoring of survival following mitigation-driven translocation of a long-lived threatened reptile. / Dickson, Brett G; Scherer, Rick D.; Kissel, Amanda M.; Wallace, Bryan P.; Langin, Kathryn M.; Gray, Miranda E.; Scheib, Amanda F.; Weise, Bruce.

In: Conservation Biology, 01.01.2019.

Research output: Contribution to journalArticle

Dickson, Brett G ; Scherer, Rick D. ; Kissel, Amanda M. ; Wallace, Bryan P. ; Langin, Kathryn M. ; Gray, Miranda E. ; Scheib, Amanda F. ; Weise, Bruce. / Multiyear monitoring of survival following mitigation-driven translocation of a long-lived threatened reptile. In: Conservation Biology. 2019.
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