語言:

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

Hartwell Hayward, Jr. Welsh University of California, Berkeley. 1993

Dissertation Abstracts International 55-07B.

線上取得

傳送到

題名:
A hierarchical analysis of the niche relationships of four amphibians from forested habitats in northwestern California.
著者: Hartwell Hayward, Jr. Welsh
University of California, Berkeley.
主題: Biology, Ecology; Biology, Zoology
所屬期刊: Dissertation Abstracts International 55-07B.
描述: 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.
The habitat of the terrestrial Del Norte salamander consists of older forests ($>$200 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.
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.
出版者: Thesis (Ph.D.)--University of California, Berkeley, 1993.
建立日期: 1993
格式: 222 p..
語言: 英文
資源來源: NUTN ALEPH

連結

返回到檢索清單

前一個記錄檢索清單 6 下ㄧ個記錄下ㄧ頁

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

Hartwell Hayward, Jr. Welsh University of California, Berkeley. 1993

正在檢索遠程資料庫，請稍等