Biodiversity and Conservation

, Volume 17, Issue 9, pp 2197–2218

Developing landscape habitat models for rare amphibians with small geographic ranges: a case study of Siskiyou Mountains salamanders in the western USA

  • Nobuya Suzuki
  • Deanna H. Olson
  • Edward C. Reilly
Original Paper

DOI: 10.1007/s10531-007-9281-4

Cite this article as:
Suzuki, N., Olson, D.H. & Reilly, E.C. Biodivers Conserv (2008) 17: 2197. doi:10.1007/s10531-007-9281-4

Abstract

To advance the development of conservation planning for rare species with small geographic ranges, we determined habitat associations of Siskiyou Mountains salamanders (Plethodon stormi) and developed habitat suitability models at fine (10 ha), medium (40 ha), and broad (202 ha) spatial scales using available Geographic Information Systems data and logistic regression analysis with an information theoretic approach. Across spatial scales, there was very little support for models with structural habitat features, such as tree canopy cover and conifer diameter. Model-averaged 95% confidence intervals for regression coefficients and associated odds ratios indicated that the occurrence of Siskiyou Mountains salamanders was positively associated with rocky soils and Pacific madrone (Abutus menziesii) and negatively associated with elevation and white fir (Abies concolor); these associations were consistent across 3 spatial scales. The occurrence of this species also was positively associated with hardwood density at the medium spatial scale. Odds ratios projected that a 10% decrease in white fir abundance would increase the odds of salamander occurrence 3.02–4.47 times, depending on spatial scale. We selected the model with rocky soils, white fir, and Oregon white oak (Quercus garryana) as the best model across 3 spatial scales and created habitat suitability maps for Siskiyou Mountains salamanders by projecting habitat suitability scores across the landscape. Our habitat suitability models and maps are applicable to selection of priority conservation areas for Siskiyou Mountains salamanders, and our approach can be easily adapted to conservation of other rare species in any geographical location.

Keywords

GISHabitat suitabilityInformation theoreticLogistic regressionPlethodon stormiSpatial scale

Abbreviations

AICc

Akaike’s information criterion corrected for small sample size

DBH

quadratic mean diameter at breast height

DEM

Digital Elevation Model

GeoBOB

Geographic Biotic Observation

HS

Habitat Suitability

ISMS

the U.S. federal Interagency Species Management System

NRIS

Natural Resource Information System

PRISM

Parameter-elevation Regressions on Independent Slopes Model

TM

Thematic Mapper

TPH

number of trees per hectare

USDA

United States Department of Agriculture

USDI

United States Department of Interior

BLM

Bureau of Land Management

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Nobuya Suzuki
    • 1
  • Deanna H. Olson
    • 2
  • Edward C. Reilly
    • 3
  1. 1.Department of ZoologyOregon State UniversityCorvallisUSA
  2. 2.USDA Forest ServicePacific Northwest Research StationCorvallisUSA
  3. 3.USDI Bureau of Land ManagementMedford DistrictMedfordUSA