thumbnail

Iteroparity in the variable environment of the salamander Ambystoma tigrinum

Ecology

6734_Church.pdf
By:
, , , ,

Links

Abstract

Simultaneous estimation of survival, reproduction, and movement is essential to understanding how species maximize lifetime reproduction in environments that vary across space and time. We conducted a four-year, capture?recapture study of three populations of eastern tiger salamanders (Ambystoma tigrinum tigrinum) and used multistate mark?recapture statistical methods to estimate the manner in which movement, survival, and breeding probabilities vary under different environmental conditions across years and among populations and habitats. We inferred how individuals may mitigate risks of mortality and reproductive failure by deferring breeding or by moving among populations. Movement probabilities among populations were extremely low despite high spatiotemporal variation in reproductive success and survival, suggesting possible costs to movements among breeding ponds. Breeding probabilities varied between wet and dry years and according to whether or not breeding was attempted in the previous year. Estimates of survival in the nonbreeding, forest habitat varied among populations but were consistent across time. Survival in breeding ponds was generally high in years with average or high precipitation, except for males in an especially ephemeral pond. A drought year incurred severe survival costs in all ponds to animals that attempted breeding. Female salamanders appear to defer these episodic survival costs of breeding by choosing not to breed in years when the risk of adult mortality is high. Using stochastic simulations of survival and breeding under historical climate conditions, we found that an interaction between breeding probabilities and mortality limits the probability of multiple breeding attempts differently between the sexes and among populations.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Iteroparity in the variable environment of the salamander Ambystoma tigrinum
Series title:
Ecology
Volume
88
Issue:
4
Year Published:
2007
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
891-903
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Ecology
First page:
891
Last page:
903
Number of Pages:
13