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Evaluating Catch Mean Trophic Level ...

Morgan, Anne Brewer.

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Evaluating Catch Mean Trophic Level as an Indicator of Ecosystem Change.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Evaluating Catch Mean Trophic Level as an Indicator of Ecosystem Change./
作者:	Morgan, Anne Brewer.
面頁冊數:	66 p.
附註:	Source: Masters Abstracts International, Volume: 52-05.
Contained By:	Masters Abstracts International52-05(E).
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=MS22851
ISBN:	9780499228512

Evaluating Catch Mean Trophic Level as an Indicator of Ecosystem Change.
Morgan, Anne Brewer.

Evaluating Catch Mean Trophic Level as an Indicator of Ecosystem Change. - 66 p.

Source: Masters Abstracts International, Volume: 52-05.

Thesis (M.R.M.)--Simon Fraser University (Canada), 2012.

The mean trophic level (MTL) of catch has been proposed to track changes in marine ecosystems resulting from fishing. Despite the ongoing debate surrounding its validity, catch MTL is a key indicator for measuring progress toward global biodiversity goals. Evaluations of catch MTL have found no linear correlation between trends in the indicator and the ecosystem state. I use simulation models and a method common in epidemiology to evaluate catch MTL as a strategic indicator for ecosystem changes even though it is not linearly related. The performance of catch MTL was 'fair' when applied globally, but varied considerably across individual simulated ecosystems. Catch MTL performed most reliably when the composition of the catch reflected the ecosystem and fishing pressure was constant over time. The inconsistent performance of catch MTL suggests it is not a reliable indicator of ecological change, but it may provide useful information about fisheries catch over time.

ISBN: 9780499228512Subjects--Topical Terms:

1017726
Biology, Ecology.

Evaluating Catch Mean Trophic Level as an Indicator of Ecosystem Change.
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245 1 0 $a Evaluating Catch Mean Trophic Level as an Indicator of Ecosystem Change.
300 $a 66 p.
500 $a Source: Masters Abstracts International, Volume: 52-05.
500 $a Adviser: Andrew B. Cooper.
502 $a Thesis (M.R.M.)--Simon Fraser University (Canada), 2012.
520 $a The mean trophic level (MTL) of catch has been proposed to track changes in marine ecosystems resulting from fishing. Despite the ongoing debate surrounding its validity, catch MTL is a key indicator for measuring progress toward global biodiversity goals. Evaluations of catch MTL have found no linear correlation between trends in the indicator and the ecosystem state. I use simulation models and a method common in epidemiology to evaluate catch MTL as a strategic indicator for ecosystem changes even though it is not linearly related. The performance of catch MTL was 'fair' when applied globally, but varied considerably across individual simulated ecosystems. Catch MTL performed most reliably when the composition of the catch reflected the ecosystem and fishing pressure was constant over time. The inconsistent performance of catch MTL suggests it is not a reliable indicator of ecological change, but it may provide useful information about fisheries catch over time.
520 $a Keywords: Catch mean trophic level; ecosystem indicators; ROC curves; fisheries.
590 $a School code: 0791.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Agriculture, Fisheries and Aquaculture. $3 1020913
650 4 $a Natural Resource Management. $3 676989
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