Oecologia

, Volume 176, Issue 2, pp 357–369

Spatial variation in water loss predicts terrestrial salamander distribution and population dynamics

Physiological ecology - Original research

DOI: 10.1007/s00442-014-3041-4

Cite this article as:
Peterman, W.E. & Semlitsch, R.D. Oecologia (2014) 176: 357. doi:10.1007/s00442-014-3041-4

Abstract

Many patterns observed in ecology, such as species richness, life history variation, habitat use, and distribution, have physiological underpinnings. For many ectothermic organisms, temperature relationships shape these patterns, but for terrestrial amphibians, water balance may supersede temperature as the most critical physiologically limiting factor. Many amphibian species have little resistance to water loss, which restricts them to moist microhabitats, and may significantly affect foraging, dispersal, and courtship. Using plaster models as surrogates for terrestrial plethodontid salamanders (Plethodon albagula), we measured water loss under ecologically relevant field conditions to estimate the duration of surface activity time across the landscape. Surface activity time was significantly affected by topography, solar exposure, canopy cover, maximum air temperature, and time since rain. Spatially, surface activity times were highest in ravine habitats and lowest on ridges. Surface activity time was a significant predictor of salamander abundance, as well as a predictor of successful recruitment; the probability of a juvenile salamander occupying an area with high surface activity time was two times greater than an area with limited predicted surface activity. Our results suggest that survival, recruitment, or both are demographic processes that are affected by water loss and the ability of salamanders to be surface-active. Results from our study extend our understanding of plethodontid salamander ecology, emphasize the limitations imposed by their unique physiology, and highlight the importance of water loss to spatial population dynamics. These findings are timely for understanding the effects that fluctuating temperature and moisture conditions predicted for future climates will have on plethodontid salamanders.

Keywords

Abundance Ecophysiology Foraging time Plaster models Plethodon albagula 

Supplementary material

442_2014_3041_MOESM1_ESM.doc (20.1 mb)
Supplementary material 1 (DOC 20556 kb) Appendix S1. Detailed methods of how mixed effect models were made to estimate rates of water loss. Appendix S2. Details of field methods used to collect salamander abundance and size data, as well as detailed description of abundance and multistate modelling procedures

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Division of Biological SciencesUniversity of MissouriColumbiaUSA
  2. 2.Illinois Natural History Survey, Prairie Research InstituteUniversity of IllinoisChampaignUSA

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