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Spatial distribution of zooplankton ...

Stockwell, Jason Dana.

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Spatial distribution of zooplankton biomass in Lake Erie.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Spatial distribution of zooplankton biomass in Lake Erie./
作者:	Stockwell, Jason Dana.
面頁冊數:	140 p.
附註:	Adviser: W. Gary Sprules.
Contained By:	Dissertation Abstracts International57-08B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NN11645
ISBN:	061211645X

Spatial distribution of zooplankton biomass in Lake Erie.
Stockwell, Jason Dana.

Spatial distribution of zooplankton biomass in Lake Erie. - 140 p.

Adviser: W. Gary Sprules.

Thesis (Ph.D.)--University of Toronto (Canada), 1996.

An optical plankton counter was used to survey lakewide zooplankton biomass in Lake Erie. Data were used to quantify spatial patterns across a range of scales, and to relate them to patterns of temperature, chlorophyll a, and planktivorous fish biomass.

ISBN: 061211645XSubjects--Topical Terms:

1017726
Biology, Ecology.

Spatial distribution of zooplankton biomass in Lake Erie.
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245 1 0 $a Spatial distribution of zooplankton biomass in Lake Erie.
300 $a 140 p.
500 $a Adviser: W. Gary Sprules.
500 $a Source: Dissertation Abstracts International, Volume: 57-08, Section: B, page: 4851.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 1996.
520 $a An optical plankton counter was used to survey lakewide zooplankton biomass in Lake Erie. Data were used to quantify spatial patterns across a range of scales, and to relate them to patterns of temperature, chlorophyll a, and planktivorous fish biomass.
520 $a Visualization of zooplankton biomass distribution along 15 transects in three seasons showed substantial spatial variability at both regional and local scales. In some cases, mean biomass among transects differed by nearly 100 times while differences within transects differed by more than 10 times.
520 $a Horizontal spatial patterns of zooplankton biomass in Lake Erie during spring and late summer 1994 were analyzed for spatial trends and autocorrelation. Significant trends were found along all 11 transects. Spatial autocorrelation underlying these trends was present in all but one case. Significant spatial patterns were detected at scales down to 25 metres, showing that heterogeneity of zooplankton biomass in large lakes is not limited to spatial scales $>$ 1 km, as suggested in several reviews.
520 $a The observed autocorrelation was removed from the 1994 data, and standard statistical methods used to estimate mean zooplankton biomass and confidence limits. In most cases, statically significant spatial trends remained after removing the autocorrelation. Little overlap of the mean estimates among various parts of the lake was found. Mean biomass estimates for the entire lake from two seasons that did not incorporate spatial features fell outside the 95% confidence limits of the "local" mean estimates more than 50% of time.
520 $a Simultaneously collected data on temperature, chlorophyll a, and planktivorous fish biomass were used to suggest hypotheses about processes that might be causing the observed patterns in zooplankton biomass. At the within-transect spatial scale, partial regression analysis showed that an average of 82% of the variance in zooplankton biomass could be explained by independent variables. Most of this explained variance was attributed to combinations of space, chlorophyll, and temperature, suggesting strong bottom-up influences. At the whole-lake scale, 94% of the variance in zooplankton biomass during spring was explained by the in pendent variables, whereas no independent variables were significant during late summer.
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650 4 $a Biology, Ecology. $3 1017726
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791 $a Ph.D.
792 $a 1996
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