Efectos de la Urbanización sobre la Ocupación de Salamandras de Arroyo

Translated title of the contribution: Effects of Urbanization on Occupancy of Stream Salamanders

Steven J. Price, Kristen K. Cecala, Robert A. Browne, Michael E. Dorcas

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Urban development is the most common form of land conversion in the United States. Using a before-after control-impact study design, we investigated the effects of urbanization on larval and adult stages of southern two-lined salamanders (Eurycea cirrigera) and northern dusky salamanders (Desmognathus fuscus). Over 5 years, we estimated changes in occupancy and probabilities of colonization and survival in 13 stream catchments after urbanization and in 17 catchments that were not urbanized. We also examined effects of proportion of urbanized area in a catchment and distance of the salamander population to the nearest stream on probabilities of colonization and survival. Before urbanization, adult and larval stages of the two salamander species occupied nearly all surveyed streams, with occupancy estimates ranging from 1.0 to 0.78. Four years after urbanization mean occupancy of larval and adult two-lined salamanders had decreased from 0.87 and 0.78 to 0.57 and 0.39, respectively. Estimates of mean occupancy of larval northern dusky salamanders decreased from 1.0 to 0.57 in urban streams 4 years after urbanization; however, adult northern dusky salamander occupancy remained close to 1.0 in urban streams over 5 years. Occupancy estimates in control streams were similar for each species and stage over 5 years. Urbanization was associated with decreases in survival probabilities of adult and larval two-lined salamanders and decreases in colonization probabilities of larval dusky salamanders. Nevertheless, proportion of impervious surface and distance to nearest stream had little effect on probabilities of survival and colonization. Our results imply that in the evaluation of the effects of urbanization on species, such as amphibians, with complex life cycles, consideration of the effects of urbanization on both adult and larval stages is required.

Translated title of the contributionEffects of Urbanization on Occupancy of Stream Salamanders
Original languageSpanish
Pages (from-to)547-555
Number of pages9
JournalConservation Biology
Volume25
Issue number3
DOIs
StatePublished - Jun 2011

Keywords

  • Amphibian decline
  • Before-after control-impact study
  • Desmognathus
  • Development
  • Dynamic occupancy model
  • Eurycea
  • Northern dusky salamander

ASJC Scopus subject areas

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

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