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A hierarchical analysis of the niche...

Welsh, Hartwell Hayward, Jr.

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A hierarchical analysis of the niche relationships of four amphibians from forested habitats in northwestern California.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A hierarchical analysis of the niche relationships of four amphibians from forested habitats in northwestern California./
Author:	Welsh, Hartwell Hayward, Jr.
Description:	222 p.
Notes:	Chair: Michael L. Morrison.
Contained By:	Dissertation Abstracts International55-07B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9430739

A hierarchical analysis of the niche relationships of four amphibians from forested habitats in northwestern California.
Welsh, Hartwell Hayward, Jr.

A hierarchical analysis of the niche relationships of four amphibians from forested habitats in northwestern California. - 222 p.

Chair: Michael L. Morrison.

Thesis (Ph.D.)--University of California, Berkeley, 1993.

Knowledge of the habitat associations of the Del Norte salamander (Plethodon elongatus), the southern torrent salamander (Rhyacotriton variegatus), the tailed frog (Ascaphus truei), and the Pacific giant salamander (Dicamptodon tenebrosus) derives primarily from anecdotal and general literature accounts. These accounts are based on museum collections and a small number of studies, most from single localities, focused on natural history aspects other than habitat. Such sources are from few localities with a preponderance of sites near major roads where collectors tend to focus, which can result in a biased view of habitat relationships. I used stratified systematic sampling to quantify the habitat of these species across their ranges in northwestern California. Variables representing three spatial scales and up to 11 ecological components were examined. Using discriminant analysis and multiple regression techniques I found these species were restricted to specific habitat features and microclimatic conditions.Subjects--Topical Terms:

1017726
Biology, Ecology.

A hierarchical analysis of the niche relationships of four amphibians from forested habitats in northwestern California.
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035 $a (UMI)AAI9430739
035 $a AAI9430739
040 $a UMI $c UMI
100 1 $a Welsh, Hartwell Hayward, Jr. $3 1032931
245 1 2 $a A hierarchical analysis of the niche relationships of four amphibians from forested habitats in northwestern California.
300 $a 222 p.
500 $a Chair: Michael L. Morrison.
500 $a Source: Dissertation Abstracts International, Volume: 55-07, Section: B, page: 2504.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 1993.
520 $a Knowledge of the habitat associations of the Del Norte salamander (Plethodon elongatus), the southern torrent salamander (Rhyacotriton variegatus), the tailed frog (Ascaphus truei), and the Pacific giant salamander (Dicamptodon tenebrosus) derives primarily from anecdotal and general literature accounts. These accounts are based on museum collections and a small number of studies, most from single localities, focused on natural history aspects other than habitat. Such sources are from few localities with a preponderance of sites near major roads where collectors tend to focus, which can result in a biased view of habitat relationships. I used stratified systematic sampling to quantify the habitat of these species across their ranges in northwestern California. Variables representing three spatial scales and up to 11 ecological components were examined. Using discriminant analysis and multiple regression techniques I found these species were restricted to specific habitat features and microclimatic conditions.
520 $a The habitat of the terrestrial Del Norte salamander consists of older forests ($> $2 00 years) with large trees, closed, multi-storied canopy comprised of both conifers and hardwoods, a cool, moist, and stable microclimate, a deep litter layer, and rocky substrates dominated by cobble-size pieces. The three aquatic species have niches consisting of a relatively narrow range of physical and microclimatic conditions associated with cold, clear headwater to mid-order streams with loose, coarse substrates and low sedimentation, in older, more structurally complex forests.
520 $a These results are consistent with earlier research indicating that these amphibians require conditions of microclimate and forest structure which are typically created, stabilized, and maintained within late seral stage forest ecosystems. These habitat conditions appear to be required for both survival and reproductive success and therefore indicate an ecological dependency by these species on late seral stage forest habitats.
590 $a School code: 0028.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Zoology. $3 1018632
690 $a 0329
690 $a 0472
710 2 $a University of California, Berkeley. $3 687832
773 0 $t Dissertation Abstracts International $g 55-07B.
790 $a 0028
790 1 0 $a Morrison, Michael L., $e advisor
791 $a Ph.D.
792 $a 1993
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9430739