東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Characterization of Oyster-Associate...

Jackson, Melanie.

FindBook

Google Book

Amazon

博客來

Characterization of Oyster-Associated Biogeochemical Processes in Oyster Restoration and Aquaculture.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Characterization of Oyster-Associated Biogeochemical Processes in Oyster Restoration and Aquaculture./
作者:	Jackson, Melanie.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	169 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-03, Section: B.
Contained By:	Dissertations Abstracts International81-03B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13860437
ISBN:	9781085618687

Characterization of Oyster-Associated Biogeochemical Processes in Oyster Restoration and Aquaculture.
Jackson, Melanie.

Characterization of Oyster-Associated Biogeochemical Processes in Oyster Restoration and Aquaculture. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 169 p.

Source: Dissertations Abstracts International, Volume: 81-03, Section: B.

Thesis (Ph.D.)--University of Maryland, College Park, 2019.

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

Oyster restoration efforts and aquaculture have increased globally to counteract the overall decline of intertidal and subtidal oyster reefs to less than 15% of historical populations. Sustainability efforts to increase oysters in the Chesapeake Bay are of particular interest because oysters provide ecosystem services that may be applied as best management practices (BMPs) to reduce nitrogen inputs, which are the primary cause of eutrophication and its consequences. Although observations show that denitrification associated with oysters effectively removes nitrogen, methodologies vary widely, and mechanisms that control denitrification remain poorly understood. First, I determined the role of oysters relative to sediments on oyster reef biogeochemical fluxes. Next, I compared in situ and ex situ methods for the determination of biogeochemical fluxes associated with oysters. Finally, I conducted field sampling and experiments to characterize how on-bottom oyster aquaculture impacts nitrogen biogeochemistry.In situ approaches for measuring oyster denitrification and other biogeochemical fluxes are logistically challenging, but incubations must include oysters if the goal of the research is to accurately quantify oyster reef biogeochemical fluxes. Regression of oyster clump fluxes against the oyster tissue biomass indicates significant positive relationships for O2 and NH4+, marginally significant and positive relationships for dissolved inorganic carbon (DIC) and N2, and no significant relationship for NOx or soluble reactive phosphorus (SRP). Above a restored oyster reef, time series and ensemble-averaged normalized profiles from in situ methods reveal that oxygen was removed, whereas DIC, NH4+, N2, and SRP were produced at the sediment-water interface. Besides NOx, N2, and SRP, all in situ derived fluxes measured over the oyster reef were in the same direction as benthic chamber flux estimates. In addition, fluxes measured across an oyster aquaculture lease show that denitrification was stimulated at the harvested sites during sampling in May and September. Although harvested sites exhibited higher rates of denitrification, seasonal differences in rates were likely dependent on ambient NOx concentrations and availability of labile organic matter. Furthermore, seasonal shifts in oyster biomass for a given oyster length from the lease mirrored changes in average oyster-associated denitrification rates from May to September. Oyster biomass was associated with changes in denitrification rates, but the relationships changed depending on the sampling month. This work provided an opportunity to investigate whether sediment-based biogeochemical concepts hold true for oysters and learn about the influence of oysters and associated activities on overall biogeochemistry. Therefore, provided that oysters are grown in favorable denitrification environmental conditions, this work adds to the growing consensus that oysters can play an important role in mitigating nitrogen in coastal areas.

ISBN: 9781085618687Subjects--Topical Terms:

545717
Biogeochemistry.
Subjects--Index Terms:

Chesapeake Bay

Characterization of Oyster-Associated Biogeochemical Processes in Oyster Restoration and Aquaculture.
LDR:04499nmm a2200469 4500 001 2268815
005 20200824100401.5
008 220629s2019 ||||||||||||||||| ||eng d
020 $a 9781085618687
035 $a (MiAaPQ)AAI13860437
035 $a AAI13860437
040 $a MiAaPQ $c MiAaPQ
100 1 $a Jackson, Melanie. $3 3546113
245 1 0 $a Characterization of Oyster-Associated Biogeochemical Processes in Oyster Restoration and Aquaculture.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 169 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-03, Section: B.
500 $a Advisor: Cornwell, Jeffrey C.
502 $a Thesis (Ph.D.)--University of Maryland, College Park, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a Oyster restoration efforts and aquaculture have increased globally to counteract the overall decline of intertidal and subtidal oyster reefs to less than 15% of historical populations. Sustainability efforts to increase oysters in the Chesapeake Bay are of particular interest because oysters provide ecosystem services that may be applied as best management practices (BMPs) to reduce nitrogen inputs, which are the primary cause of eutrophication and its consequences. Although observations show that denitrification associated with oysters effectively removes nitrogen, methodologies vary widely, and mechanisms that control denitrification remain poorly understood. First, I determined the role of oysters relative to sediments on oyster reef biogeochemical fluxes. Next, I compared in situ and ex situ methods for the determination of biogeochemical fluxes associated with oysters. Finally, I conducted field sampling and experiments to characterize how on-bottom oyster aquaculture impacts nitrogen biogeochemistry.In situ approaches for measuring oyster denitrification and other biogeochemical fluxes are logistically challenging, but incubations must include oysters if the goal of the research is to accurately quantify oyster reef biogeochemical fluxes. Regression of oyster clump fluxes against the oyster tissue biomass indicates significant positive relationships for O2 and NH4+, marginally significant and positive relationships for dissolved inorganic carbon (DIC) and N2, and no significant relationship for NOx or soluble reactive phosphorus (SRP). Above a restored oyster reef, time series and ensemble-averaged normalized profiles from in situ methods reveal that oxygen was removed, whereas DIC, NH4+, N2, and SRP were produced at the sediment-water interface. Besides NOx, N2, and SRP, all in situ derived fluxes measured over the oyster reef were in the same direction as benthic chamber flux estimates. In addition, fluxes measured across an oyster aquaculture lease show that denitrification was stimulated at the harvested sites during sampling in May and September. Although harvested sites exhibited higher rates of denitrification, seasonal differences in rates were likely dependent on ambient NOx concentrations and availability of labile organic matter. Furthermore, seasonal shifts in oyster biomass for a given oyster length from the lease mirrored changes in average oyster-associated denitrification rates from May to September. Oyster biomass was associated with changes in denitrification rates, but the relationships changed depending on the sampling month. This work provided an opportunity to investigate whether sediment-based biogeochemical concepts hold true for oysters and learn about the influence of oysters and associated activities on overall biogeochemistry. Therefore, provided that oysters are grown in favorable denitrification environmental conditions, this work adds to the growing consensus that oysters can play an important role in mitigating nitrogen in coastal areas.
590 $a School code: 0117.
650 4 $a Biogeochemistry. $3 545717
650 4 $a Environmental science. $3 677245
650 4 $a Physiology. $3 518431
650 4 $a Ecology. $3 516476
650 4 $a Aquatic sciences. $3 3174300
650 4 $a Biological oceanography. $3 2122748
653 $a Chesapeake Bay
653 $a Oyster restoration efforts
653 $a Ecosystem services
653 $a Denitrification
653 $a Biogeochemical fluxes
653 $a On-bottom oyster aquaculture
653 $a Dissolved inorganic carbon
653 $a Coastal areas
653 $a Labile organic matter
653 $a Oyster biomass
690 $a 0425
690 $a 0768
690 $a 0416
690 $a 0329
690 $a 0792
690 $a 0719
710 2 $a University of Maryland, College Park. $b Marine-Estuarine-Environmental Sciences. $3 1023615
773 0 $t Dissertations Abstracts International $g 81-03B.
790 $a 0117
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13860437