Survival and Growth of Larval Coastal Giant Salamanders (Dicamptodon tenebrosus) in Streams in the Oregon Coast Range

Conditions that affect amphibian larval growth and survival can affect population structure through both larval and adult stages of their life history. We conducted a two-year, mark-recapture study of larval, Coastal Giant Salamanders, Dicamptodon tenebrosus, in 14 small streams in the Oregon Coast...

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Bibliographic Details
Published in:Copeia 2007-02, Vol.2007 (1), p.123-130
Main Authors: Sagar, Jina P, Olson, Deanna H, Schmitz, Richard A
Format: Article
Language:English
Subjects:
Adults
Age structure
Amphibians
Animal migration
Animal populations
Birds
Caudata
Coastal ranges
Creeks & streams
Culverts
Dicamptodon tenebrosus
Environmental conditions
Fish
Forest management
Freshwater
Larvae
Larval development
Metamorphosis
Population growth
Probability
Reptiles & amphibians
s
Salamanders
Streams
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Summary:Conditions that affect amphibian larval growth and survival can affect population structure through both larval and adult stages of their life history. We conducted a two-year, mark-recapture study of larval, Coastal Giant Salamanders, Dicamptodon tenebrosus, in 14 small streams in the Oregon Coast Range to assess spatial and temporal variation in growth and apparent survival. We modeled larval survival and growth by season and age class and examined these demographic rates in the presence of road crossing culverts. Cormack-Jolly-Seber models indicated that apparent survival was lower for first-year larvae than second/third-year larvae (13%, SE  =  0.03; 28%, SE  =  0.08) and apparent survival varied by time/season. The >5% difference in the effect of age on survival is potentially biologically significant (effect size  =  −0.10; confidence interval  =  −0.05, −0.16). Effects of culverts on larval survival were inconclusive, while no effects on growth were detected.
ISSN:0045-8511
2766-1512
1938-5110
2766-1520
DOI:10.1643/0045-8511(2007)7[123:SAGOLC]2.0.CO;2