Although reports of salamanders in tidal habitats in the Pacific Northwest are rare, Ferguson (1956) found Taricha granulosa (Rough-skinned Newts) in the tidal area of a stream in southern Oregon, and we also found a large breeding group (over 60 individuals) of this species in the same tidal area as the Dicamptodon we observed (Hopkins and Hopkins, pers.
Our observation appears to be the first indication of possible salt tolerance and tidal habitat utilization in the genus Dicamptodon.
Key words: Coastal Giant Salamander, Dicamptodon tenebrosus, habitat, salinity, tidal
Analysis of microhabitat use by larval Dicamptodon and Rhyacotriton at Mack Creek found difference in their use of the four measured microhabitats ([chi square] = 26.
In contrast to our study, others have shown that larger-sized larval Dicamptodon may eat small vertebrates.
Thus, avoidance of large larval Dicamptodon would be advantageous to the persistence of Rhyacotriton.
Rhyacotriton spends its entire life cycle in seeps, headwaters, or splash zones (Nussbaum and Tait, 1977), while Dicamptodon larvae spend 1-3 y as larvae in streams (Nussbaum and Clothier, 1973).
Food and feeding of larval Dicamptodon ensatus from California.
Systematic implications of geographic patterns of variation in the genus Dicamptodon
Hybridization and cryptic species in Dicamptodon
The Coastal Giant Salamander, Dicamptodon tenebrosus, in contrast, is more widespread in the Pacific Northwest (Good 1989).
Biologists from the Prineville, Oregon Office of the Bureau of Land Management (BLM) made the initial observations of Dicamptodon in the lower White River area.
We caught 8 Dicamptodon larvae during a 2-hr search by 3 surveyors.
Other unpublished observations of Dicamptodon exist in the upper White River and on forested slopes around Mt Hood (Foster and Olson 2014).
The river separates divergent clades of Dicamptodon