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An evaluation of processes that infl...

Shima, Jeffrey Scott.

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An evaluation of processes that influence variability in abundance of a coral reef fish (Thalassoma hardwicke).

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	An evaluation of processes that influence variability in abundance of a coral reef fish (Thalassoma hardwicke)./
作者:	Shima, Jeffrey Scott.
面頁冊數:	116 p.
附註:	Source: Dissertation Abstracts International, Volume: 61-09, Section: B, page: 4533.
Contained By:	Dissertation Abstracts International61-09B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9987915
ISBN:	0599946423

An evaluation of processes that influence variability in abundance of a coral reef fish (Thalassoma hardwicke).
Shima, Jeffrey Scott.

An evaluation of processes that influence variability in abundance of a coral reef fish (Thalassoma hardwicke). - 116 p.

Source: Dissertation Abstracts International, Volume: 61-09, Section: B, page: 4533.

Thesis (Ph.D.)--University of California, Santa Barbara, 1999.

Patterns of abundance of reef organisms are influenced by a multitude of factors. I evaluate the consequences of considering separately and jointly, the effects of larval inputs, available habitat, and mortality on spatial patterns of abundance of juvenile six bar wrasse (Thalassoma hardwicke ). Separately, habitat and larval availability each appeared to adequately explain of patterns of wrasse abundance. Their joint effects were accurate only when patterns of post-settlement mortality were also considered. Results illustrate how commonly used 'single-factor' approaches may lead to erroneous conclusions, and underscore the need to consider multiple processes concurrently.

ISBN: 0599946423Subjects--Topical Terms:

1017726
Biology, Ecology.

An evaluation of processes that influence variability in abundance of a coral reef fish (Thalassoma hardwicke).
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245 1 3 $a An evaluation of processes that influence variability in abundance of a coral reef fish (Thalassoma hardwicke).
300 $a 116 p.
500 $a Source: Dissertation Abstracts International, Volume: 61-09, Section: B, page: 4533.
500 $a Chair: Russell J. Schmitt.
502 $a Thesis (Ph.D.)--University of California, Santa Barbara, 1999.
520 $a Patterns of abundance of reef organisms are influenced by a multitude of factors. I evaluate the consequences of considering separately and jointly, the effects of larval inputs, available habitat, and mortality on spatial patterns of abundance of juvenile six bar wrasse (Thalassoma hardwicke ). Separately, habitat and larval availability each appeared to adequately explain of patterns of wrasse abundance. Their joint effects were accurate only when patterns of post-settlement mortality were also considered. Results illustrate how commonly used 'single-factor' approaches may lead to erroneous conclusions, and underscore the need to consider multiple processes concurrently.
520 $a Current frameworks that quantitatively assess the relative importance of multiple causal factors ignore variability in the 'importance' of processes through space and time. I used an existing analytical method to assess the relative importance of initial wrasse inputs and subsequent juvenile mortality in determining the average abundances of wrasse populations in different locations and times. The relative importance of processes varied significantly both temporally and spatially across a range of scales, and indicate a need for future assessments to incorporate this variability.
520 $a Density-dependent mortality has frequently been documented for fishes that recruit to reefs in large aggregations, but its role for the vast majority of reef fishes that recruit in comparatively low numbers is still poorly known. I explored patterns of mortality of newly settled six bar wrasse that typically settle to isolated patch reefs in low numbers. Per capita mortality rates of natural and experimentally manipulated populations were strongly density dependent and suggest this process remains important for organisms with small populations.
520 $a Ecologists have traditionally invoked density-dependent processes as elements necessary to regulate populations despite observations that group size has been shown to influence vital demographic rates. I use a factorial experiment to uncouple the effects of density and group size on mortality of newly settled six bar wrasse. Mortality was both density- and number-dependent, and appeared to be influenced by within-cohort agonistic interactions that scale with group size. Results highlight the important role of number-dependence as a regulatory mechanism of local populations.
590 $a School code: 0035.
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791 $a Ph.D.
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