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LEADER 04955ctm 2200565 i 4500
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ocm36075146
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OCoLC
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20240430153514.0
008
961212s1995 xx ab bm 000 0 eng d
035
a| (Sirsi) o36075146
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a| (OCoLC)36075146
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a| n-us-nc
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a| EREE
050
4
a| QH91.8.B4
b| D34 1995
100
1
a| Dailey, Susan K.,
e| author.
?| UNAUTHORIZED
245
1
0
a| Interactions of benthic communities and material fluxes across the sediment-water interface in North Carolina and Virginia estuaries /
c| by Susan K. Dailey.
264
0
c| 1995.
300
a| vi, 120 leaves :
b| illustrations (some color), maps ;
c| 28 cm
336
a| text
b| txt
2| rdacontent
337
a| unmediated
b| n
2| rdamedia
338
a| volume
b| nc
2| rdacarrier
502
b| M.S.
c| East Carolina University
d| 1995
500
a| Submitted to the faculty of the Department of Biology.
500
a| Advisor: Robert R. Christian
520
3
a| Sediment-water material fluxes of O₂, NH₄+ , and CO₂ were measured in core incubations and a microcosm experiment. Through testing of 4 hypotheses, using general linear models with statistical control, I examined relationships of material fluxes and community structure. Fluxes were determined from light and dark core incubations of 1-m and 2-m sediments from Masonboro Island and Currituck Banks, NC, and Goodwin Islands and Hog Island, VA. From the same cores, Chl a concentrations [mu]g cc ̄¹ sediment), bacterial densities (# cc ̄¹ sediment), and faunal densities (# 10 cc ̄¹ sediment) were quantified. Chi a concentration contributed to the models that explained O₂ (p= 0.0001) and NH₄+ (p= 0.01) fluxes in light incubated sediments, while microfauna contributed significantly to the model of O₂ fluxes (p = 0.0001 ). Site and depth variables helped explain variances of both O₂ and NH₄+ fluxes. Site differences reflect edaphic, water-column, or metabolic characteristics of organism species and sizes indigenous to study locations. Depth may represent long-term differences in the light history of benthic sediments. In the microcosm experiment, light and nutrient treatments were imposed in intermediate terms (days) to study effects on material fluxes and community structure of the sediments. O₂ fluxes were significantly affected by light and day but not nutrient enrichments. NH₄+ models were not significant. When organisms were included, bacterial and faunal densities contributed significantly to the model of O₂ flux in the dark. Chl a and light contributed significantly to the model of NCR O₂ fluxes. O₂ and NH₄+ fluxes from microcosm experiments were better explained by community structure than fluxes measured in field experiments. This inconsistency in effects of organisms may be from uncontrolled factors in field experiments. Alternatively, there may be lack of a natural redox-potential discontinuity layer in the microcosm experiments, which may decrease chemical oxygen demand. This may greatly affect sediment-water material fluxes in the field.
504
a| Includes bibliographical references (leaves 111-119).
650
0
a| Benthos
x| Microbiology
z| North Carolina.
=| ^A431600
650
0
a| Benthos
x| Microbiology
z| Virginia.
=| ^A431600
650
0
a| Estuarine sediments
z| North Carolina.
=| ^A111995
650
0
a| Estuarine sediments
z| Virginia.
=| ^A111995
650
7
a| Benthos
x| Microbiology.
2| fast
0| (OCoLC)fst00830526
650
7
a| Estuarine sediments.
2| fast
0| (OCoLC)fst00915723
651
7
a| North Carolina.
2| fast
1| https://id.oclc.org/worldcat/entity/E39PBJqW4fbp3DFmdyrBFFbfMP
0| (OCoLC)fst01204304
?| UNAUTHORIZED
651
7
a| Virginia.
2| fast
1| https://id.oclc.org/worldcat/entity/E39PBJdh4WqHgwWkJJ4b3FGJXd
0| (OCoLC)fst01204597
?| UNAUTHORIZED
655
7
a| dissertations.
2| aat
0| (CStmoGRI)aatgf300028029
655
7
a| Academic theses.
2| fast
0| (OCoLC)fst01726453
655
7
a| Academic theses.
2| lcgft
655
7
a| Thèses et écrits académiques.
2| rvmgf
0| (CaQQLa)RVMGF-000001173
700
1
a| Christian, Robert R.
q| (Robert Raymond),
d| 1947-
e| degree supervisor.
=| ^A168653
710
2
a| East Carolina University.
b| Department of Biology.
=| ^A637467
856
4
1
z| Access via ScholarShip
u| http://hdl.handle.net/10342/11936
949
a| Click on web address
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