Seasonal Variations in Sediment and Bottom Water Chemistry of Western Long Island Sound: Implications for Lobster Mortality

Cuomo, Carmela; Valente, Raymond M.; Dogru, Deren

doi:10.2983/0730-8000(2005)24[805:svisab]2.0.co;2

Cited by 13 publications

(2 citation statements)

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“…When combined with atmospheric deposition, fertilizer runoff (Vaudrey et al 2016 ), and other terrestrial sources, elevated N has been directly linked to recurrent (since the 1970s) eutrophication, bottom-water hypoxia (categorized by CTDEEP as dissolved oxygen (DO) < 3.00 mg l −1 ), and occasionally anoxia (DO < 1.00 mg l −1 ) (Koppelman et al 1976 ; Welsch and Eller 1991 ; Ballestero et al 2018 ; CTDEEP 2019 ). WLIS hypoxia typically occurs during the summer from Jul to Aug (Parker and O’Reilly 1991 ; NYSDEC 2000 ; Vaudrey 2017 ; Ballestero et al 2018 ) and presents a chronic ecological risk that threatens LIS biodiversity and ecosystem resources (Cuomo et al 2005 ; Pearce and Balcom 2005 ; CTDEEP 2019 ). For example, prolonged (2-Jul through 21-Aug 1999) hypoxia covered 120 mi 2 (311 km 2 ) and led to a stress-induced mass mortality event of WLIS lobster populations (Cuomo et al 2005 ; Pearce and Balcom 2005 ).…”

Section: Introductionmentioning

confidence: 99%

“…WLIS hypoxia typically occurs during the summer from Jul to Aug (Parker and O’Reilly 1991 ; NYSDEC 2000 ; Vaudrey 2017 ; Ballestero et al 2018 ) and presents a chronic ecological risk that threatens LIS biodiversity and ecosystem resources (Cuomo et al 2005 ; Pearce and Balcom 2005 ; CTDEEP 2019 ). For example, prolonged (2-Jul through 21-Aug 1999) hypoxia covered 120 mi 2 (311 km 2 ) and led to a stress-induced mass mortality event of WLIS lobster populations (Cuomo et al 2005 ; Pearce and Balcom 2005 ). Thus, N-loading and subsequent hypoxia threaten LIS ecosystems and fisheries.…”

Section: Introductionmentioning

confidence: 99%

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Transitions in nitrogen and organic matter form and concentration correspond to bacterial population dynamics in a hypoxic urban estuary

et al. 2023

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Nitrogen (N) inputs to developed coastlines are linked with multiple ecosystem and socio-economic impacts worldwide such as algal blooms, habitat/resource deterioration, and hypoxia. This study investigated the microbial and biogeochemical processes associated with recurrent, seasonal bottom-water hypoxia in an urban estuary, western Long Island Sound (WLIS), that receives high N inputs. A 2-year (2020–2021) field study spanned two hypoxia events and entailed surface and bottom depth water sampling for dissolved nutrients as inorganic N (DIN; ammonia-N and nitrite + nitrate (N + N)), organic N, orthophosphate, organic carbon (DOC), as well as chlorophyll a and bacterial abundances. Physical water quality data were obtained from concurrent conductivity, temperature, and depth casts. Results showed that dissolved organic matter was highest at the most-hypoxic locations, DOC was negatively and significantly correlated with bottom-water dissolved oxygen (Pearson’s r = −0.53, p = 0.05), and ammonia-N was the dominant DIN form pre-hypoxia before declining throughout hypoxia. N + N concentrations showed the reverse, being minimal pre-hypoxia then increasing during and following hypoxia, indicating that ammonia oxidation likely contributed to the switch in dominant DIN forms and is a key pathway in WLIS water column nitrification. Similarly, at the most hypoxic sampling site, bottom depth bacteria concentrations ranged ~ 1.8 × 10 4 –1.1 × 10 5 cells ml −1 pre-hypoxia, declined throughout hypoxia, and were positively and significantly correlated (Pearson’s r = 0.57; p = 0.03) with ammonia-N, confirming that hypoxia influences N-cycling within LIS. These findings provide novel insight to feedbacks between major biogeochemical (N and C) cycles and hypoxia in urban estuaries. Supplementary Information The online version contains supplementary material available at 10.1007/s10533-023-01021-2.

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