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Title: Effects of elevated turbidity and nutrients on the net production of a tropical seagrass community

Abstract

Dredging effects on seagrass communities in the Florida Keys were examined by (1) comparing impacts on net production resulting from dredging and natural weather events, (2) determining changes in community photosynthetic efficiency, (3) evaluating shading and nutrient effects on net production, and (4) developing a systems dynamics model. Net community production was estimated during numerous meteorological and dredging events using the Odum-Hoskins oxygen technique in flow-through field microcosms. In other experiments, shading and nutrients (phosphorus, nitrate, and ammonia) were manipulated to simulate dredge plume conditions. The greatest depression in net community production resulted from severe thunderstorms and dredging events, respectively. In field microcosm experiments, significant interaction occurred between shading and nutrient concentration. The model of seagrass production was most sensitive to changes in nutrient-seagrass relationships, seagrass production estimates, and seagrass-light interactions. Recovery of seagrass biomass following numerous dredging events (3.5 years) was longer than that from the estimated total annual thunderstorms encountered (1 year) but shorter than recovery from hurricane events (4.1 years).

Authors:
Publication Date:
Research Org.:
Florida Univ., Gainesville (USA)
OSTI Identifier:
7243854
Alternate Identifier(s):
OSTI ID: 7243854
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; BIOMASS; PRODUCTION; FLORIDA; DREDGING; MATHEMATICAL MODELS; PHOTOSYNTHESIS; TURBIDITY; WEATHER; CHEMICAL REACTIONS; ENERGY SOURCES; FEDERAL REGION IV; NORTH AMERICA; PHOTOCHEMICAL REACTIONS; RENEWABLE ENERGY SOURCES; SYNTHESIS; USA 140504* -- Solar Energy Conversion-- Biomass Production & Conversion-- (-1989)

Citation Formats

Caldwell, J.W. Effects of elevated turbidity and nutrients on the net production of a tropical seagrass community. United States: N. p., 1985. Web.
Caldwell, J.W. Effects of elevated turbidity and nutrients on the net production of a tropical seagrass community. United States.
Caldwell, J.W. Tue . "Effects of elevated turbidity and nutrients on the net production of a tropical seagrass community". United States.
@article{osti_7243854,
title = {Effects of elevated turbidity and nutrients on the net production of a tropical seagrass community},
author = {Caldwell, J.W.},
abstractNote = {Dredging effects on seagrass communities in the Florida Keys were examined by (1) comparing impacts on net production resulting from dredging and natural weather events, (2) determining changes in community photosynthetic efficiency, (3) evaluating shading and nutrient effects on net production, and (4) developing a systems dynamics model. Net community production was estimated during numerous meteorological and dredging events using the Odum-Hoskins oxygen technique in flow-through field microcosms. In other experiments, shading and nutrients (phosphorus, nitrate, and ammonia) were manipulated to simulate dredge plume conditions. The greatest depression in net community production resulted from severe thunderstorms and dredging events, respectively. In field microcosm experiments, significant interaction occurred between shading and nutrient concentration. The model of seagrass production was most sensitive to changes in nutrient-seagrass relationships, seagrass production estimates, and seagrass-light interactions. Recovery of seagrass biomass following numerous dredging events (3.5 years) was longer than that from the estimated total annual thunderstorms encountered (1 year) but shorter than recovery from hurricane events (4.1 years).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1985},
month = {Tue Jan 01 00:00:00 EST 1985}
}

Thesis/Dissertation:
Other availability
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