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Consequences of Multiple Stability and Connectivity on Coral Reef Ecosystem Dynamics.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Consequences of Multiple Stability and Connectivity on Coral Reef Ecosystem Dynamics./
Author:	Greiner, Ariel.
Description:	1 online resource (177 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
Contained By:	Dissertations Abstracts International85-01B.
Subject:	Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30311681click for full text (PQDT)
ISBN:	9798379765774

Consequences of Multiple Stability and Connectivity on Coral Reef Ecosystem Dynamics.
Greiner, Ariel.

Consequences of Multiple Stability and Connectivity on Coral Reef Ecosystem Dynamics. - 1 online resource (177 pages)

Source: Dissertations Abstracts International, Volume: 85-01, Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2023.

Includes bibliographical references

Coral larval dispersal networks are changing due to multiple anthropogenic stressors that are destroying coral habitat and shifting reefs from coral-dominated to macroalgal-dominated states that support smaller fish communities. However, it is unclear whether these connectivity changes could themselves propagate or contain shifts to macroalgal-dominated states. My research investigates how the combined effects of connectivity and local multiple stability affect coral persistence with the goal of informing conservation decisions. In Chapter 2, I explore how plausible scenarios of climate-change-induced loss could change coral larval dispersal networks and their reseeding potential. I find that these scenarios of loss (yielding the same number of reefs) lead to vastly different global reef networks, from which full reseeding is impossible. In Chapter 3, I develop a two-reef mathematical model and determine that two connected reefs may exhibit a novel third, mixed coral-macroalgal stable state at low dispersal. Furthermore, I find that high- and low-grazing reefs have stable coral-dominated and macroalgal-dominated states if connected by high dispersal to a low or high-grazing reef (respectively). In Chapter 4, I extend this two-reef model to a model of 75 Fijian reefs to determine the interplay among connectivity, local multiple stability, and management strategies in larger networks across three grazing scenarios spanning the stability regimes elucidated in Chapter 3. I find that increasing the grazing rate of a few reefs leads to higher overall coral cover in the entire network, even in reefs with low grazing rates. I also find evidence that a combined strategy of increasing the water quality and increasing a few reefs' grazing rates is more effective than either strategy in isolation, across all grazing scenarios. Overall, my research increases our general understanding of how ecosystems with multiple stable states respond to connectivity changes, stresses the importance of collecting connectivity and grazing rate data for coral reefs and pioneers novel methods for informing reef management design. Specifically, my thesis stresses the importance of connectivity and local stability dynamics to coral reef management by showing that natural larval dispersal can tip connected reefs to higher coral states but is not sufficient to restore coral habitat worldwide.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798379765774Subjects--Topical Terms:

516476
Ecology.
Subjects--Index Terms:

AnthropoceneIndex Terms--Genre/Form:

542853
Electronic books.

Consequences of Multiple Stability and Connectivity on Coral Reef Ecosystem Dynamics.
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500 $a Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
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502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2023.
504 $a Includes bibliographical references
520 $a Coral larval dispersal networks are changing due to multiple anthropogenic stressors that are destroying coral habitat and shifting reefs from coral-dominated to macroalgal-dominated states that support smaller fish communities. However, it is unclear whether these connectivity changes could themselves propagate or contain shifts to macroalgal-dominated states. My research investigates how the combined effects of connectivity and local multiple stability affect coral persistence with the goal of informing conservation decisions. In Chapter 2, I explore how plausible scenarios of climate-change-induced loss could change coral larval dispersal networks and their reseeding potential. I find that these scenarios of loss (yielding the same number of reefs) lead to vastly different global reef networks, from which full reseeding is impossible. In Chapter 3, I develop a two-reef mathematical model and determine that two connected reefs may exhibit a novel third, mixed coral-macroalgal stable state at low dispersal. Furthermore, I find that high- and low-grazing reefs have stable coral-dominated and macroalgal-dominated states if connected by high dispersal to a low or high-grazing reef (respectively). In Chapter 4, I extend this two-reef model to a model of 75 Fijian reefs to determine the interplay among connectivity, local multiple stability, and management strategies in larger networks across three grazing scenarios spanning the stability regimes elucidated in Chapter 3. I find that increasing the grazing rate of a few reefs leads to higher overall coral cover in the entire network, even in reefs with low grazing rates. I also find evidence that a combined strategy of increasing the water quality and increasing a few reefs' grazing rates is more effective than either strategy in isolation, across all grazing scenarios. Overall, my research increases our general understanding of how ecosystems with multiple stable states respond to connectivity changes, stresses the importance of collecting connectivity and grazing rate data for coral reefs and pioneers novel methods for informing reef management design. Specifically, my thesis stresses the importance of connectivity and local stability dynamics to coral reef management by showing that natural larval dispersal can tip connected reefs to higher coral states but is not sufficient to restore coral habitat worldwide.
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