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EBookClubs

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Book Feeding Ecology of Larvae of the Pacific Giant Salamander Dicamptodon Tenebrosus and Their Role as Top Predator in a Headwater Stream Benthic Community

Download or read book Feeding Ecology of Larvae of the Pacific Giant Salamander Dicamptodon Tenebrosus and Their Role as Top Predator in a Headwater Stream Benthic Community written by Michael S. Parker (Professor of biology) and published by . This book was released on 1992 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Recovery Strategy for the Coastal Giant Salamander Dicamptodon Tenebrosus in Canada

Download or read book Recovery Strategy for the Coastal Giant Salamander Dicamptodon Tenebrosus in Canada written by and published by . This book was released on 2017 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Canadian distribution of this salamander is restricted to the Chilliwack drainage system in southwestern British Columbia, where it occurs mainly in cool, clear mountain streams and surrounding riparian forest. Major threats include habitat loss, degradation and fragmentation due to forest harvest, road building, and encroaching residential development. These threats may be exacerbated by droughts and flooding events that are predicted to increase with climate change. Poor dispersal ability, low reproductive rate, late maturity, and long generation time increase the vulnerability of the species"--Reason for designation, p. 5.

Book Recovery Strategy for the Coastal Giant Salamander Dicamptodon Tenebrosus in Canada

Download or read book Recovery Strategy for the Coastal Giant Salamander Dicamptodon Tenebrosus in Canada written by and published by . This book was released on 2017 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Canadian distribution of this salamander is restricted to the Chilliwack drainage system in southwestern British Columbia, where it occurs mainly in cool, clear mountain streams and surrounding riparian forest. Major threats include habitat loss, degradation and fragmentation due to forest harvest, road building, and encroaching residential development. These threats may be exacerbated by droughts and flooding events that are predicted to increase with climate change. Poor dispersal ability, low reproductive rate, late maturity, and long generation time increase the vulnerability of the species"--Reason for designation, p. 5.

Book Canadian Journal of Zoology

Download or read book Canadian Journal of Zoology written by and published by . This book was released on 2002 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Movement and Demography of Larval Coastal Giant Salamanders Dicamptodon Tenebrosus in Streams with Culverts in the Oregon Coast Range

Download or read book Movement and Demography of Larval Coastal Giant Salamanders Dicamptodon Tenebrosus in Streams with Culverts in the Oregon Coast Range written by Jina P. Sagar and published by . This book was released on 2004 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Barriers to the movement of aquatic organisms can increase the genetic and spatial isolation of populations and may decrease the viability of these regional populations. Focus on culvert passage issues has increased as federal agencies attempt to inventory and replace road-crossing stream culverts that are barriers to the movement of anadromous fish. However, the effect of road-crossing culverts on the movement of other aquatic organisms is not known. The coastal giant salamander (Dicamptodon tenebrosus) is an important component of headwater stream communities and their movement may be affected by culverts in the larval aquatic stage. The objectives of this study were to determine the effect of road-crossing culverts on the movement and survival of larval coastal giant salamanders in the Oregon Coast Range. We conducted a mark-recapture study on larval D. tenebrosus 3rd and 4th order streams to: i) determine culvert use and passage by design type (pipe and arch types) relative to reference stream reaches without culverts; and ii) model larval survival and growth by season, age and culvert presence. We assessed the movement of over 2,000 larval D. tenebrosus in 14 streams and found that larvae were highly sedentary. Mean movement distances did not differ with culvert presence. However, a small portion of larvae (20%) moved sufficient distances to assess culvert passage. Larvae moved less frequently through stream reaches with culverts than stream reaches without culverts, suggesting a barrier effect. There was less upstream movement through pipe culverts than arch culverts. Also, there were lower larval densities in pipe culverts, indicating arch culverts provided more larval habitat. Larval density both inside culverts and in the adjacent stream reaches was associated with the presence of large substrates, which may be important in facilitating larval D. tenebrosus movement through culverts. Stream reaches with culverts were associated with higher levels of fine sediments, however, which may reduce the suitability of near-culvert habitats. Survival estimates indicated high selection pressure early in the larval period. Apparent survival was lower in summer, and for first-year larvae in comparison to second/third-year larvae. Larval survival for both age groups was lower in reaches of stream with culverts although this effect was weak. Culvert effects on movement of coastal giant salamander aquatic larvae indicate they can operate as barriers but their effect on survival remains unclear. Culvert replacements that simulate both the natural stream bed and hydraulic conditions would help provide both habitat and passage opportunities for larval D. tenebrosus.

Book Spatial Ecology Behavior and Habitat Use of Terrestrial Coastal Giant Salamanders Dicamptodon Tenebrosus in the Central Washington Cascades

Download or read book Spatial Ecology Behavior and Habitat Use of Terrestrial Coastal Giant Salamanders Dicamptodon Tenebrosus in the Central Washington Cascades written by Brandon Fessler and published by . This book was released on 2012 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Conservation Priorities for the Amphibians and Reptiles of Canada

Download or read book Conservation Priorities for the Amphibians and Reptiles of Canada written by David Seburn and published by . This book was released on 2000 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Riparian Vegetation and Larval Pacific Giant Dicamptodon Tenebrosus and Adult Western Redback Plethodon Vehiculum Salamanders in the Oregon Coast Range

Download or read book Riparian Vegetation and Larval Pacific Giant Dicamptodon Tenebrosus and Adult Western Redback Plethodon Vehiculum Salamanders in the Oregon Coast Range written by Paula Hayes Graff and published by . This book was released on 2006 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Riparian areas in the Pacific Northwest provide important biotic and abiotic features, such as down wood, moist microsites, and abundant invertebrate prey that benefit aquatic and terrestrial amphibians. Reported high densities of amphibians from streams and riparian areas in the Pacific Northwest highlight their importance in riparian food webs. Amphibians provide an important trophic link between terrestrial and aquatic systems because they may exploit both terrestrial and aquatic prey and in turn they are prey for other vertebrates. In the Oregon Coast Range, riparian vegetation is often more diverse than upland vegetation and there is typically a considerable deciduous component. However, forestry regulations in Oregon require landowners to promote the growth of conifer over deciduous trees in riparian areas to benefit salmonids and other fishes. The goal of our research was to examine associations between the distribution and diets of aquatic and terrestrial amphibians and vegetation in second- and third-order Oregon Coast Range streams and riparian areas. Sites reflected overstory conditions in managed forests of the central Oregon Coast Range, ranging from primarily red alder (Alnus rubra) in the riparian zone to mostly Douglas- fir (Pseudotsuga menziesii). The two most common amphibians detected were the aquatic Pacific Giant Salamander larvae (Dicamptodon tenebrosus) and the terrestrial Western Redback Salamander (Plethodon vehiculum). Our first research objective was to identify habitat characteristics with an emphasis on riparian vegetation, that could be associated with the presence of these two species. We used logistic regression to examine the presence of these salamanders among sites and the information-theoretic approach using Akaike Information Criterion (AIC) methods to compare the strength of evidence of a set of candidate models formed from a priori hypotheses. The highest ranked model explained 95% of the variability of the presence of Dicamptodon tenebrosus larvae among sites and included variables representing percent cover of Douglas- fir, elevation, amount of wood cover, and lithology type. The odds of the presence of D. tenebrosus increased with the percent cover of Douglas- fir over the wetted width of the stream. Two competitive models (

Book Status Report on the Smallmouth Salamander in Canada

Download or read book Status Report on the Smallmouth Salamander in Canada written by Canada. Committee on the Status of Endangered Wildlife in Canada and published by . This book was released on 1991 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Measuring the Effects of Increasing Loads of Fine Sediment from Timber Harvest and Road Building on Aquatic Populations of Dicamptodon Tenebrosus pacific Giant Salamander in California s Redwoods

Download or read book Measuring the Effects of Increasing Loads of Fine Sediment from Timber Harvest and Road Building on Aquatic Populations of Dicamptodon Tenebrosus pacific Giant Salamander in California s Redwoods written by Seth Pogue and published by . This book was released on 2008 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dicamptodon tenebrosus (Pacific giant salamander) was evaluated for suitability as an indicator of aquatic habitat quality relative to increasing loads of fine sediment from timber harvest and road building. I compared three surrogates of D. tenebrosus population success - biomass per unit area, density, and number of age classes (dependent variables) to two measures of stream sedimentation - RSI, which measures how much of the stream bed becomes mobilized at peak flow, and D50, the median bed particle diameter (independent variables) on 49 streams from three subjective disturbance categories: a control group, a moderate management group, and a high management group. Streams impacted by sediment exhibited fewer surviving age classes, and also significantly less biomass per square meter of pool bottom. These streams were from the moderate and high management categories. Unimpacted streams (control group) exhibited the greatest number of surviving age classes and the highest biomass. This study also presents the first quantitative analysis of D. tenebrosus age class structure. These animals live to be at least twelve years old.

Book Pacific Giant Salamander

Download or read book Pacific Giant Salamander written by Donald A. Blood and published by Province of British Columbia, Ministry of Environment, Lands and Parks. This book was released on 1993 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: