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Carbon dynamics in freshwater experi...

University of Calgary (Canada).

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Carbon dynamics in freshwater experimental aquatic systems: Implications of climate warming.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Carbon dynamics in freshwater experimental aquatic systems: Implications of climate warming./
Author:	Flanagan, Kyla M.
Description:	141 p.
Notes:	Source: Dissertation Abstracts International, Volume: 69-04, Section: B, page: 2061.
Contained By:	Dissertation Abstracts International69-04B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=NR38018
ISBN:	9780494380185

Carbon dynamics in freshwater experimental aquatic systems: Implications of climate warming.
Flanagan, Kyla M.

Carbon dynamics in freshwater experimental aquatic systems: Implications of climate warming. - 141 p.

Source: Dissertation Abstracts International, Volume: 69-04, Section: B, page: 2061.

Thesis (Ph.D.)--University of Calgary (Canada), 2008.

There is growing evidence that freshwater bodies will be significantly impacted by climate warming. Potential resulting effects on CO2 flux from lakes and ponds could create a feedback on climate that, depending on the magnitude of response, may influence the rate of global climate change. This thesis shows that in experimental aquatic mesocosms, the direction and magnitude of the change in CO2 flux resulting from warming differs when either the food web or the microbial loop become more relevant.

ISBN: 9780494380185Subjects--Topical Terms:

1017726
Biology, Ecology.

Carbon dynamics in freshwater experimental aquatic systems: Implications of climate warming.
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245 1 0 $a Carbon dynamics in freshwater experimental aquatic systems: Implications of climate warming.
300 $a 141 p.
500 $a Source: Dissertation Abstracts International, Volume: 69-04, Section: B, page: 2061.
502 $a Thesis (Ph.D.)--University of Calgary (Canada), 2008.
520 $a There is growing evidence that freshwater bodies will be significantly impacted by climate warming. Potential resulting effects on CO2 flux from lakes and ponds could create a feedback on climate that, depending on the magnitude of response, may influence the rate of global climate change. This thesis shows that in experimental aquatic mesocosms, the direction and magnitude of the change in CO2 flux resulting from warming differs when either the food web or the microbial loop become more relevant.
520 $a The effect of warming on the pelagic food web is especially important to CO2 flux when there is minimal influence of microbial sediment respiration. In this scenario, more carbon is sequestered from the atmosphere with warming. There are two mechanisms tested in this thesis that establish how the food web controls carbon flux. The first is an equilibrium response, where a change in food web composition leads to altered carbon loss rates and therefore CO2 exchange with the atmosphere. The second mechanism is a non-equilibrium response, where the per capita algal primary production rate is increased due to warming, resulting in an observed increase in CO 2 sequestration. Both of these mechanisms will likely be important in controlling CO2 flux from freshwater bodies under warmer conditions.
520 $a When a large pool of organic sediments is present, the dominant response to warming occurs via microbial degradation of the organic carbon pool, increasing the CO2 flux to the atmosphere. This response can be large even with only a one or two degree increase in temperature; however, the duration of the response is limited by the amount of carbon in the sediments available for decomposition. Although this response will not be sustained indefinitely, it will affect the annual integrated carbon budget of the lake and alter the contribution to the global carbon cycle.
520 $a The observed opposing responses of CO2 flux under different experimental conditions indicate that not all freshwater bodies will respond to warming in a similar manner. Understanding how these scenarios apply in situ and integrating the impacts for lakes worldwide is important for determining the dynamic effect of warming on the global carbon budget.
590 $a School code: 0026.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Limnology. $3 1018638
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