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Environmental dependence of non-cons...

Button, Katrina A.

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Environmental dependence of non-consumptive effects in predator-prey interactions.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Environmental dependence of non-consumptive effects in predator-prey interactions./
Author:	Button, Katrina A.
Description:	88 p.
Notes:	Adviser: Scott Peacor.
Contained By:	Masters Abstracts International46-06.
Subject:	Agriculture, Fisheries and Aquaculture. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1455715
ISBN:	9780549607588

Environmental dependence of non-consumptive effects in predator-prey interactions.
Button, Katrina A.

Environmental dependence of non-consumptive effects in predator-prey interactions. - 88 p.

Adviser: Scott Peacor.

Thesis (M.S.)--Michigan State University, 2008.

Predators affect the population dynamics of their prey in two ways, through direct consumption (consumptive effect) or through inducing trait changes (non-consumptive effect). Studies have shown that the trait changes induced by predators reduce fitness enough to make up a large portion of the total effect of the predator. However, these studies were conducted under a finite set of natural conditions. Little is known about how variation in biotic and abiotic parameters affects trait expression or the importance of non-consumptive effects. I investigated the importance of the non-consumptive effect of Bythotrephes longimanus (predator) on Daphnia mendotae (prey) in terms of population growth rate (instantaneous measure) and population dynamics (longer-term), using three modeling techniques. D. mendotae respond to B. longimanus, a visual predator, by migrating down in the water column into cooler, darker water to avoid predation, however, this behavior incurs a reproductive cost associated with the cooler water. I found that the non-consumptive effects are important over a large range of conditions. Interestingly, changes in water temperature and B. longimanus density had a large non-linear impact on the importance of non-consumptive effects due to changes in vertical migration behavior. Understanding how B. longimanus effects change seasonally will provide better predictions of impacts in the Great Lakes and the many other systems which it has invaded. This approach is also key to predicting species effects in different scenarios, such as those predicted with Global Warming.

ISBN: 9780549607588Subjects--Topical Terms:

1020913
Agriculture, Fisheries and Aquaculture.

Environmental dependence of non-consumptive effects in predator-prey interactions.
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100 1 $a Button, Katrina A. $3 1277398
245 1 0 $a Environmental dependence of non-consumptive effects in predator-prey interactions.
300 $a 88 p.
500 $a Adviser: Scott Peacor.
500 $a Source: Masters Abstracts International, Volume: 46-06, page: 3116.
502 $a Thesis (M.S.)--Michigan State University, 2008.
520 $a Predators affect the population dynamics of their prey in two ways, through direct consumption (consumptive effect) or through inducing trait changes (non-consumptive effect). Studies have shown that the trait changes induced by predators reduce fitness enough to make up a large portion of the total effect of the predator. However, these studies were conducted under a finite set of natural conditions. Little is known about how variation in biotic and abiotic parameters affects trait expression or the importance of non-consumptive effects. I investigated the importance of the non-consumptive effect of Bythotrephes longimanus (predator) on Daphnia mendotae (prey) in terms of population growth rate (instantaneous measure) and population dynamics (longer-term), using three modeling techniques. D. mendotae respond to B. longimanus, a visual predator, by migrating down in the water column into cooler, darker water to avoid predation, however, this behavior incurs a reproductive cost associated with the cooler water. I found that the non-consumptive effects are important over a large range of conditions. Interestingly, changes in water temperature and B. longimanus density had a large non-linear impact on the importance of non-consumptive effects due to changes in vertical migration behavior. Understanding how B. longimanus effects change seasonally will provide better predictions of impacts in the Great Lakes and the many other systems which it has invaded. This approach is also key to predicting species effects in different scenarios, such as those predicted with Global Warming.
590 $a School code: 0128.
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