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Evaluating the Ecological Factors Limiting the Upstream Distribution of Fishes Along the Rocky Mountain - Plains Continuum.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Evaluating the Ecological Factors Limiting the Upstream Distribution of Fishes Along the Rocky Mountain - Plains Continuum./
作者:	Webb, Colton L.
面頁冊數:	1 online resource (121 pages)
附註:	Source: Masters Abstracts International, Volume: 84-11.
Contained By:	Masters Abstracts International84-11.
標題:	Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30488317click for full text (PQDT)
ISBN:	9798379562175

Evaluating the Ecological Factors Limiting the Upstream Distribution of Fishes Along the Rocky Mountain - Plains Continuum.
Webb, Colton L.

Evaluating the Ecological Factors Limiting the Upstream Distribution of Fishes Along the Rocky Mountain - Plains Continuum. - 1 online resource (121 pages)

Source: Masters Abstracts International, Volume: 84-11.

Thesis (M.S.)--University of Wyoming, 2023.

Includes bibliographical references

Understanding how ecological factors influence species distribution has been an increasingly pertinent topic in ecology as it has direct implications for predicting how species will respond to climate change. It is often considered that the upstream limit of freshwater organisms is determined by thermal factors and that species will be able to track shifting isotherms to higher elevations. However, observed distributions do not always correspond to the thermally suitable limits suggesting that upstream limits are not influenced by water temperature alone. My first chapter investigated the relative influence of thermal and non-thermal factors on the distribution of fishes across the North Platte River drainage, USA. I found that stream temperature and channel slope generally had the greatest relative influence on species upstream distribution limits and that species highly influenced by slope displayed lower climate tracking ability. My second chapter aimed to gain mechanistic insight into how these abiotic factors limit upstream distribution. This entailed evaluating fish growth and body condition in relation to abiotic stream variables along a Rocky Mountain-Great Plains stream continuum. I determined that many species display less first-year growth at their upstream extent than conspecifics at lower elevations. This suggests that they are thermally limited, and temperature is an important factor restricting their upstream distribution. Contrary to chapter one, channel slope did not display significant relationships to any of the species' growth along the gradient. However, this does not mean that channel slope is not an important limiting factor but only that it does not directly influence first-year growth. Rather, channel slope may hinder other important mechanisms of population establishment at species upstream extent not directly evaluated in this study. For example, high stream slope may be associated with an absence of vegetated slack water areas important for reproduction or foraging. Together results from each chapter contribute to the conservation of freshwater biodiversity because we can better understand the mechanisms limiting the upstream distribution of fishes along the Rocky Mountain-Great Plains continuum.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798379562175Subjects--Topical Terms:

516476
Ecology.
Subjects--Index Terms:

Climate changeIndex Terms--Genre/Form:

542853
Electronic books.

Evaluating the Ecological Factors Limiting the Upstream Distribution of Fishes Along the Rocky Mountain - Plains Continuum.
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