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Effects of Trophic Relationships on Oyster Reef Restoration Success in The Mississippi Sound.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Effects of Trophic Relationships on Oyster Reef Restoration Success in The Mississippi Sound./
作者:	Fleer, Virginia.
面頁冊數:	1 online resource (159 pages)
附註:	Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
標題:	Ecology. -
電子資源:	click for full text (PQDT)
ISBN:	9780355512618

Effects of Trophic Relationships on Oyster Reef Restoration Success in The Mississippi Sound.
Fleer, Virginia.

Effects of Trophic Relationships on Oyster Reef Restoration Success in The Mississippi Sound. - 1 online resource (159 pages)

Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.

Thesis (Ph.D.)--The University of Southern Mississippi, 2017.

Includes bibliographical references

Natural and anthropogenic changes resulting from altered hydrology, hurricanes, variable precipitation, and the BP oil spill have all taken their toll on oyster reefs in Mississippi. In response, oyster reef restoration efforts are currently underway within the Northern Gulf of Mexico. In order to understand why these efforts succeed or fail, it is crucial to consider predator-prey relationships within the context of the trophic dynamics of oyster reefs. Thus, for this dissertation study I integrated a multidisciplinary approach to understanding key trophic interactions affecting oyster recruitment, growth and survival, comprising field sampling, manipulative lab experiments, and individual-based modeling. Spat settlement density and abundances of key members of the trophic web were quantified at twelve oyster reef sites over the course of seven months. Peak spat settlement at each reef occurred in September, with Linear Mixed Model analyses indicating a significant difference between mean spat settlement per day between reef types (F = 29.229, p <0.005), among regions (F = 81.203, p <0.005), and among sampling time periods (F = 35.190, p <0.001), as well as in all two and three-way interactions among these factors. Additionally, PERMANOVA revealed spatial-temporal differences in the oyster trophic assemblage attributable to region and season. A suite of manipulative laboratory experiments examined: (1) the predatory effects of both oyster drills and mud crabs on various sizes of oyster spat; (2) oyster reef trophic interactions relative to different substrate types; and 3) the effects of key predator removals on trophic interactions. Mesocosm experiments showed that mud crabs and oyster drills greatly reduced oyster spat survival. Moreover, size selectivity by both of these predators was evident. Complex experiments involving different substrates and multiple predators revealed that limestone substrate used for restoration potentially leads to greater spat mortality in contrast to oyster shell. Information from field study and mesocosm experiments was then used to construct an individual-based model simulating oyster production and recruitment at reefs in the Mississippi Sound. Results from each component of this dissertation study were instrumental to the overall project goal of understanding trophic relationships affecting oyster reef restoration in the Mississippi Sound.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355512618Subjects--Topical Terms:

575279
Ecology.
Index Terms--Genre/Form:

554714
Electronic books.

Effects of Trophic Relationships on Oyster Reef Restoration Success in The Mississippi Sound.
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520 $a Natural and anthropogenic changes resulting from altered hydrology, hurricanes, variable precipitation, and the BP oil spill have all taken their toll on oyster reefs in Mississippi. In response, oyster reef restoration efforts are currently underway within the Northern Gulf of Mexico. In order to understand why these efforts succeed or fail, it is crucial to consider predator-prey relationships within the context of the trophic dynamics of oyster reefs. Thus, for this dissertation study I integrated a multidisciplinary approach to understanding key trophic interactions affecting oyster recruitment, growth and survival, comprising field sampling, manipulative lab experiments, and individual-based modeling. Spat settlement density and abundances of key members of the trophic web were quantified at twelve oyster reef sites over the course of seven months. Peak spat settlement at each reef occurred in September, with Linear Mixed Model analyses indicating a significant difference between mean spat settlement per day between reef types (F = 29.229, p <0.005), among regions (F = 81.203, p <0.005), and among sampling time periods (F = 35.190, p <0.001), as well as in all two and three-way interactions among these factors. Additionally, PERMANOVA revealed spatial-temporal differences in the oyster trophic assemblage attributable to region and season. A suite of manipulative laboratory experiments examined: (1) the predatory effects of both oyster drills and mud crabs on various sizes of oyster spat; (2) oyster reef trophic interactions relative to different substrate types; and 3) the effects of key predator removals on trophic interactions. Mesocosm experiments showed that mud crabs and oyster drills greatly reduced oyster spat survival. Moreover, size selectivity by both of these predators was evident. Complex experiments involving different substrates and multiple predators revealed that limestone substrate used for restoration potentially leads to greater spat mortality in contrast to oyster shell. Information from field study and mesocosm experiments was then used to construct an individual-based model simulating oyster production and recruitment at reefs in the Mississippi Sound. Results from each component of this dissertation study were instrumental to the overall project goal of understanding trophic relationships affecting oyster reef restoration in the Mississippi Sound.
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