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Assessing the Impact of Florida's Hard Clam (Mercenaria mercenaria) Aquaculture Industry on Nitrogen Cycling in Local Coastal Waters.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Assessing the Impact of Florida's Hard Clam (Mercenaria mercenaria) Aquaculture Industry on Nitrogen Cycling in Local Coastal Waters./
Author:	Black, Kenneth Wayne, Jr.
Description:	1 online resource (235 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 83-12, Section: B.
Contained By:	Dissertations Abstracts International83-12B.
Subject:	Aquatic sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28866042click for full text (PQDT)
ISBN:	9798802707364

Assessing the Impact of Florida's Hard Clam (Mercenaria mercenaria) Aquaculture Industry on Nitrogen Cycling in Local Coastal Waters.
Black, Kenneth Wayne, Jr.

Assessing the Impact of Florida's Hard Clam (Mercenaria mercenaria) Aquaculture Industry on Nitrogen Cycling in Local Coastal Waters. - 1 online resource (235 pages)

Source: Dissertations Abstracts International, Volume: 83-12, Section: B.

Thesis (Ph.D.)--University of Florida, 2021.

Includes bibliographical references

Hard clam (Mercenaria mercenaria) aquaculture is an important segment of Florida's seafood production. The recent growth of shellfish farming in Florida necessitates a robust understanding of the interaction between hard clam aquaculture operations and local coastal ecosystems. This need prompted my work on this project, which was intended to shed light on the impact that Florida's hard clam aquaculture industry has on nitrogen cycling. I hypothesized that hard clam farming, as it is practiced in local systems, is relatively benign with respect to risk for cultural eutrophication as a result of bioavailable nitrogen accumulation. More specifically, I tested the predictions that 1) natural mechanisms that remove nitrogen from lease sediments are not impaired by hard clam aquaculture operations, and 2) that clam feeding results in the filtration of significant amounts of particulate organic nitrogen, decreasing the total nitrogen load in the water column. I tested these predictions using a field study in which actively farmed lease sites were compared to unfarmed reference sites, and then I developed an ecophysiological model to examine the nature and magnitude of important clam-mediated nitrogen transports and transformations.Using quantitative polymerase chain reaction, I found that the density of the denitrifying microbial community in lease sediments was not significantly different from those of non-farmed reference sites, suggesting that the denitrification potential of farmed sites is not impaired. The results of a nitrogen gas flux experiment also supported this conclusion. Additionally, the modeling work suggested that the hard clams grown on a single lease filter ~2370 kg of particulate organic nitrogen from the water column during a normal growth cycle. Of this amount, clams deposit ~1450 kg N onto the sediments as feces and other wastes, where it is available as substrate for the denitrifying microbial community. Farmers then remove an additional ~650 kg of the filtered nitrogen by harvesting clam biomass. Taken together, the results of the field study and modeling work suggest that hard clam aquaculture, as it is currently practiced in Florida, is not likely to increase risk for cultural eutrophication in local systems.

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

Mode of access: World Wide Web

ISBN: 9798802707364Subjects--Topical Terms:

3174300
Aquatic sciences.
Subjects--Index Terms:

AquacultureIndex Terms--Genre/Form:

542853
Electronic books.

Assessing the Impact of Florida's Hard Clam (Mercenaria mercenaria) Aquaculture Industry on Nitrogen Cycling in Local Coastal Waters.
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