Turbidity Maximum Entrapment of Phytoplankton in the Chesapeake Bay

Keller, David P.; Lee, Dong Y.; Hood, Raleigh R.

doi:10.1007/s12237-013-9692-2

Cited by 19 publications

(11 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pigment ratios showed seasonal shifts in phytoplankton community composition from diatom‐dominated in spring to a more diverse community in fall, which is consistent with seasonal patterns in some estuaries (Ansotegui et al ; Cloern and Dufford ; Gameiro et al ) but not others (Pinckney et al ; Keller et al ). An earlier study in the Columbia River estuary used pigment concentrations and 18S rRNA gene sequencing to show high abundance of marine diatoms and the mixotrophic estuarine ciliate Mesodinium sp.…”

Section: Discussionsupporting

confidence: 81%

Quantity and quality of particulate organic matter controls bacterial production in the Columbia River estuary

Crump

Fine

Fortunato

et al. 2017

Limnology & Oceanography

View full text Add to dashboard Cite

Estuaries function as “bioreactors” for fluvial materials in which microbial, biogeochemical, and ecological processes transform organic matter and nutrients prior to export to coastal oceans. The impact of estuarine bioreactors is linked to the bioavailability and residence time of fluvial material, and to rates of microbial activity. In the Columbia River estuary, water residence time is short (approximately 2 d), but particle residence time is extended by estuarine turbidity maxima (ETM). To investigate relationships between organic matter and microbial activity, samples were collected in spring and fall 2012 and summer 2013, and ETM particles were fractionated by settling velocity using an Owen‐style settling column. Data were also analyzed from 16 other sampling campaigns conducted in 1990–2009. The composition of suspended particulate matter shifted seasonally following the spring freshet and river phytoplankton bloom with decreasing organic content, increasing C/N ratio, and an increasing contribution of autochthonous particulate organic matter (POM) produced in four shallow lateral bays (based on del‐PO13C and pigment ratios). Heterotrophic bacterial production responded to seasonal changes in POM and correlated most strongly with estimates of labile particulate nitrogen during any particular season, and with the riverine flux of chlorophyll a (Chl a) across all seasons. Regression models suggest that labile particulate nitrogen and bacterial production can be predicted from sensor‐based measurements including turbidity, salinity, and temperature in the estuary and Chl a in the river. These results demonstrate that heterotrophic activity in the Columbia River estuary is controlled by POM lability, and by the degree to which ETM retain and concentrate POM.

show abstract

Section: Discussionsupporting

confidence: 81%

Quantity and quality of particulate organic matter controls bacterial production in the Columbia River estuary

Crump

Fine

Fortunato

et al. 2017

Limnology & Oceanography

View full text Add to dashboard Cite

show abstract

“…Phytoplankton maintain a high biomass in clearer waters seaward of the turbidity maximum in spring and summer, i.e., when turbidity has decreased. These features were reported by field studies (Fisher et al ; Roman et al ; Keller et al ), lending confidence that the attribution of total absorption coefficients to algal and nonalgal components was properly made by GSCM.…”

Section: Resultssupporting

confidence: 68%

Detecting phytoplankton diatom fraction based on the spectral shape of satellite‐derived algal light absorption coefficient

Zheng

DiGiacomo

2017

Limnology & Oceanography

View full text Add to dashboard Cite

Knowledge about phytoplankton composition is important for biological and biogeochemical research as well as for ecological applications (e.g., water quality) in coastal and inland waters. Satellite remote sensing can potentially map the baseline patterns, anomalies, and trends of phytoplankton composition on a synoptic basis. A prominent challenge is the attribution of the total optical signal to phytoplankton amid interference from minerals and humus. Here, we obtained the phytoplankton light absorption coefficient, a ph (k), in the Chesapeake Bay by partitioning satellite-derived total light absorption coefficient of water using the generalized stacked-constraints model (GSCM). We show that the red-to-blue band ratio of GSCM-derived a ph (670)/a ph (440) can be associated with diatom fraction in Chesapeake Bay. Further, the spatial-temporal patterns shown in the satellite-derived diatom fraction data agree well with field studies conducted previously around this region, including low diatom dominance in summer, high diatom dominance in the lower bay in winter, diatom-dominated spring blooms in coastal waters outside of the bay, and increasing seasonal variability of diatom fraction from the upper to the lower bay. We also found that in the middle bay the summer diatom fraction correlates strongly with spring streamflow on an annual basis, which can be explained because sediment deposited by spring freshets is the main source of silicate supply during summer. These results suggest that the satellite-derived diatom fraction maps can serve as a baseline for detecting phytoplankton composition anomalies, and highlight the effectiveness of using absorption-based approach to extract phytoplankton composition information for optically complex waters.

show abstract

“…The Estuarine Turbidity Maxima (ETM) zone has much more amounts of suspended particles than its upstream and downstream [10]. They can trap land-based debris (e.g., fine sediments, organic matters and pollutants) and transferred them into bottom sediments [11,12]. Sediments are widely known as longterm reservoir and continuous sources for OTC residues based on their more than 10 years of half-life [13,14].…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal variation and source apportionment of organotin compounds in sediments in the Yangtze Estuary

et al. 2019

View full text Add to dashboard Cite

Background: The Yangtze Estuary is a vital habitat and breeding ground for many rare species (e.g., Chinese sturgeon, Chinese paddlefish). From the view of marine ecosystem health, organotin compounds (OTCs) should be of great concern in this area based on their broad applications and potential threats. At present study, five OTC species were determined in 28 and 26 surface sediments from the Yangtze Estuary (including the Nearshore area, Estuarine Turbidity Maxima (ETM) zone and Plume zone) in 2015 and 2016, respectively. Meanwhile, four sludge samples were collected from the adjacent Shidongkou Wastewater Treatment Plant to perform a source apportionment. Results: The sum of OTCs presented a decreasing trend towards the open sea, averaging 4.8 ± 6.0 ng Sn g −1 dw in the Plume zone. While OTC levels in the Nearshore area (2.9-34.6 ng Sn g −1 dw) were similar with those in the ETM zone (5.6-36.0 ng Sn g −1 dw), and the sites belonging to the Deepwater Navigation Channel showed heavier contamination in the ETM zone than the Nearshore area. There are abundant suspended particles and organic matters in the ETM zone that can effectively capture the hydrophobic compounds. Besides, OTC contamination in shoreside zone was more serious than those in channel center. High OTC loads (average 633 ± 124 ng Sn g −1 dw) were also found in sludge samples from adjacent wastewater treatment plant. Conclusion: Land-based sources (e.g. sewage discharge, runoff) are probably one of the predominant pathways of OTCs entering the ocean. Combining with previous observation in 2014, OTC contamination in the same ten sites varied slightly with years. Risk assessment indicated that the concentrations of tributyltin (TBT) are sufficient to pose ecosystem threats especially in the ETM zone. Hence, OTC contamination issues in the Yangtze Estuary still can not be neglected.

show abstract

Turbidity Maximum Entrapment of Phytoplankton in the Chesapeake Bay

Cited by 19 publications

References 62 publications

Quantity and quality of particulate organic matter controls bacterial production in the Columbia River estuary

Quantity and quality of particulate organic matter controls bacterial production in the Columbia River estuary

Detecting phytoplankton diatom fraction based on the spectral shape of satellite‐derived algal light absorption coefficient

Spatiotemporal variation and source apportionment of organotin compounds in sediments in the Yangtze Estuary

Contact Info

Product

Resources

About