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Positive Interactions between Seagra...

Chin, Diana Wheeler.

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Positive Interactions between Seagrasses and Chemosymbiotic Bivalves in Temperate and Tropical Ecosystems.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Positive Interactions between Seagrasses and Chemosymbiotic Bivalves in Temperate and Tropical Ecosystems./
作者:	Chin, Diana Wheeler.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	294 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-10, Section: B.
Contained By:	Dissertations Abstracts International81-10B.
標題:	Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27669747
ISBN:	9781658470575

Positive Interactions between Seagrasses and Chemosymbiotic Bivalves in Temperate and Tropical Ecosystems.
Chin, Diana Wheeler.

Positive Interactions between Seagrasses and Chemosymbiotic Bivalves in Temperate and Tropical Ecosystems. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 294 p.

Source: Dissertations Abstracts International, Volume: 81-10, Section: B.

Thesis (Ph.D.)--State University of New York at Stony Brook, 2019.

This item must not be sold to any third party vendors.

Facultative mutualisms involving foundation species are critical to the structure and function of ecosystems. Thus, understanding form and variation in these interactions can provide insights valuable to conservation and restoration efforts. Infaunal bivalves in the families Solemyidae and Lucinidae host sulfur-oxidizing chemosymbionts in their gill tissues and are frequently associated with seagrasses in coastal ecosystems. Recent research suggests that lucinids and seagrasses can form facultative mutualistic relationships mediated by sediment biogeochemistry, particularly through effects on dissolved sulfides in porewater. However, ecological investigations of solemyids and lucinids remain limited. I evaluated the potential for biogeochemically mediated facultative mutualism between solemyids and seagrasses and examined changes in lucinid facilitation of seagrasses under environmental stress. Manipulations in laboratory mesocosms showed that the Atlantic awning clam, Solemya velum, facilitated growth and survival of the temperate seagrass Zostera marina, likely by suppressing sulfides in the seagrass rhizosphere and mobilizing dissolved nutrients through pumping behavior. Reciprocally higher growth and condition of S. velum in the presence of Z. marina was not observed, though a long-term benefit to S. velum from sulfide production in seagrass-colonized sediments was not ruled out. Additional mesocosm experiments demonstrated that the strength of seagrass facilitation by lucinids is context-dependent. In the tropical seagrass Thalassia testudinum, growth facilitation by the tiger lucine Codakia orbicularis manifested only under environmental conditions that impeded T. testudinum's normal resistance to porewater sulfide. On the other hand, facilitation by Loripes orbiculatus was near-obligate for Zostera noltei from a temperate lagoon, where sediment sulfide production strongly limited seagrass survival. Finally, field surveys and a laboratory experiment generally supported the importance of seagrass presence and sediment quality to patterns of chemosymbiotic bivalve abundance and distribution but challenged the idea that some basic metrics, such as sediment organic matter content, are useful proxies. This dissertation highlights that variability in conceptually similar positive interactions across species, space, and time may have important consequences for the persistence of ecosystems and human efforts to conserve or restore them.

ISBN: 9781658470575Subjects--Topical Terms:

516476
Ecology.
Subjects--Index Terms:

Facilitation

Positive Interactions between Seagrasses and Chemosymbiotic Bivalves in Temperate and Tropical Ecosystems.
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500 $a Source: Dissertations Abstracts International, Volume: 81-10, Section: B.
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520 $a Facultative mutualisms involving foundation species are critical to the structure and function of ecosystems. Thus, understanding form and variation in these interactions can provide insights valuable to conservation and restoration efforts. Infaunal bivalves in the families Solemyidae and Lucinidae host sulfur-oxidizing chemosymbionts in their gill tissues and are frequently associated with seagrasses in coastal ecosystems. Recent research suggests that lucinids and seagrasses can form facultative mutualistic relationships mediated by sediment biogeochemistry, particularly through effects on dissolved sulfides in porewater. However, ecological investigations of solemyids and lucinids remain limited. I evaluated the potential for biogeochemically mediated facultative mutualism between solemyids and seagrasses and examined changes in lucinid facilitation of seagrasses under environmental stress. Manipulations in laboratory mesocosms showed that the Atlantic awning clam, Solemya velum, facilitated growth and survival of the temperate seagrass Zostera marina, likely by suppressing sulfides in the seagrass rhizosphere and mobilizing dissolved nutrients through pumping behavior. Reciprocally higher growth and condition of S. velum in the presence of Z. marina was not observed, though a long-term benefit to S. velum from sulfide production in seagrass-colonized sediments was not ruled out. Additional mesocosm experiments demonstrated that the strength of seagrass facilitation by lucinids is context-dependent. In the tropical seagrass Thalassia testudinum, growth facilitation by the tiger lucine Codakia orbicularis manifested only under environmental conditions that impeded T. testudinum's normal resistance to porewater sulfide. On the other hand, facilitation by Loripes orbiculatus was near-obligate for Zostera noltei from a temperate lagoon, where sediment sulfide production strongly limited seagrass survival. Finally, field surveys and a laboratory experiment generally supported the importance of seagrass presence and sediment quality to patterns of chemosymbiotic bivalve abundance and distribution but challenged the idea that some basic metrics, such as sediment organic matter content, are useful proxies. This dissertation highlights that variability in conceptually similar positive interactions across species, space, and time may have important consequences for the persistence of ecosystems and human efforts to conserve or restore them.
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