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• W78632152 abstract "Abstract: The Georgia Bight has a broad shallow continental shelf. The major nutrient inputs are deepwater Gulf Stream intrusions along the shelf break and nearshore outwelling from Spartina salt marshes and river runoff. The middle portion of the shelf is not appreciably affected by either process. Nine stations off Georgia were sampled to detect possible differences in the benthos of these three regions. All sediments were moderately- to well-sorted sand. A large coarse fraction occurred at the outer stations. Surface sediment carbon and nitrogen were extremely low at all stations (> 0.1% C and > 0.01% N dry wt). Sediment chlorophyll a values ranged from 29 to 142 μg m2- (1 to 6 μg gm-1). Macrobenthic biomass at the inner three stations was significantly lower (3 to 9 grams wet weight m-2) than middle and outer shelf regions (14 to 22) but all were lower than shelf environments in other areas. In contrast, meiofaunal densities (853 10 cm-2) and biomass (543 μg 10 cm-2) of the middle shelf regions were higher than inner and outer stations. Nematodes generally dominated the meiofaunal taxa. ATP biomass (μg ATP cc-1) ranged from 35 to 106 among the shelf stations with no apparent regional patterns. Microbial biomass was relatively constant along the coast but increased north to south along the shelf break. Interstitial glucose concentrations (5 7 to 100 ng cc-1) and glucose uptake (6 to 19 μg-1 hr-1) at the inner stations were similar to those observed at the outer stations. ATP biomass was positively correlated with glucose uptake but negatively correlated with denitrification rates. Nitrogen fixation (3 to 20 pmoles C2H4 cc-1 hr-1) and denitrification (0.1 to 0.5 μg N2O cc-1 hr-1) decreased along the shelf break from north to south. Preliminary results suggest that a combination of an unfavorable sedimentary regime and low nutrient input results in an impoverished benthos but that nitrogen-rich Gulf Stream intrusions may influence benthic processes on the outer regions of the continental shelf of the Georgia Bight. Microbenthos, with high metabolic rates and fast generation times, probably reflect more immediate nutrient effects, whereas the distribution of macrobenthos might reflect integrative effects of intrusion." @default.
• W78632152 created "2016-06-24" @default.
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• W78632152 date "1978-01-01" @default.
• W78632152 modified "2023-10-14" @default.
• W78632152 title "POSSIBLE EFFECTS OF GULF STREAM INTRUSIONS AND COASTAL RUNOFF ON THE BENTHOS OF THE CONTINENTAL SHELF OF THE GEORGIA BIGHT" @default.
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• W78632152 doi "https://doi.org/10.1016/b978-0-12-751850-3.50040-6" @default.
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