Elucidating terrestrial nutrient sources to a coastal lagoon, Chincoteague Bay, Maryland, USA

Fertig, Benjamin; O’Neil, Judith M.; Beckert, Kristen A.; Cain, C.J.; Needham, David M.; Carruthers, Tim J. B.; Dennison, William C.

doi:10.1016/j.ecss.2012.08.013

Cited by 14 publications

(9 citation statements)

References 60 publications

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“…The results clearly indicated that NH + 4 -N and urea in the lagoon water play a predominant role (43%) on the variation of Chl-a concentration over other biochemical parameters. These results were in association with the in situ observation made by Fertig et al (2013) depicting the greatest uptake preference of ammonium, followed by urea, and nitrate by phytoplankton in Chincoteague Bay, Maryland, USA.…”

Section: Chlorophyll (Chl-a) Dissolved Oxygen (Do) and Primary Produsupporting

confidence: 83%

Influence of nutrient input on the trophic state of a tropical brackish water lagoon

et al. 2015

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Ecosystem level changes in water quality and biotic communities in coastal lagoons have been associated with intensification of anthropogenic pressures. In light of incipient changes in Asia's largest brackish water lagoon (Chilika, India), an examination of different dissolved nutrients distribution and phytoplankton biomass, was conducted through seasonal water quality monitoring in the year 2011. The lagoon showed both spatial and temporal variation in nutrient concentration, mostly altered by freshwater input, regulated the chlorophyll distribution as well. Dissolved inorganic N:P ratio in the lagoon showed nitrogen limitation in May and December, 2011. Chlorophyll in the lagoon varied between 3.38 and 17.66 mg m −3 . Spatially, northern part of the lagoon showed higher values of DIN and chlorophyll during most part of the year, except in May, when highest DIN was recorded in the southern part. Statistical analysis revealed that dissolved NH + 4 -N and urea could combinedly explain 43% of Chlorophyll-a (Chl-a) variability which was relatively higher than that explained by NO − 3 -N and NO − 2 -N (12.4%) in lagoon water. Trophic state index calculated for different sectors of the lagoon confirmed the intersectoral and inter-seasonal shift from mesotrophic to eutrophic conditions largely depending on nutrient rich freshwater input.

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Section: Chlorophyll (Chl-a) Dissolved Oxygen (Do) and Primary Produsupporting

confidence: 83%

Influence of nutrient input on the trophic state of a tropical brackish water lagoon

et al. 2015

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“…Further analysis of local scale trends will be important as these results are applied in the development of nutrient loads and criteria for nutrient reduction strategies. A recent, more detailed analyses of the Newport Bay (subregion of region III) and Johnson Bay (subregion of region IV) have been provided by Beckert et al (2011) and Fertig et al (2013).…”

Section: Discussionmentioning

confidence: 99%

“…Changes in PO 4 3− and in NH 4 + appeared to have occurred relatively abruptly, or in step function, around the years 2001 to 2003, although evidence of some changes is apparent in earlier years as well (Wazniak et al 2007). In general, poultry operations and agricultural practices have not changed significantly over the past decade, except that there has been increasing pressure for application of best management practices, and thus, it is not likely that these land uses alone would have led to such abrupt changes, although these operations are likely major contributors to overall nutrient loads (Beckert et al 2011;Fertig et al 2013). While TN concentrations have been found to be very high in tributary streams adjacent to poultry farms (~50-200 μM-N), there has been no appreciable change in the total numbers of poultry produced or in the numbers of farms in the past decade (United States Department of Agriculture USDA 2007;Fertig et al 2013).…”

Section: Drivers Of Changementioning

confidence: 99%

“…The coastal embayments of Maryland and Virginia, shallow coastal lagoons, have been experiencing the impacts of eutrophication over the past decade, as evidenced by increasing nutrients, sporadic or sustained hypoxia, increased macroalgal and phytoplankton blooms, losses of submersed aquatic vegetation (SAV), among other effects (Goshorn et al 2004;Wazniak et al 2007;Glibert et al 2007Glibert et al , 2010Fertig et al 2013). In addition, the phytoplankton blooms have been shown to be composed of increasing proportions of those species that are considered to be harmful algal blooms (HAB) species, including the brown tide species Aureococcus anophagefferens (Trice et al 2004;Wazniak and Glibert 2004;Glibert et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…We explore the reinforcing anthropogenic, natural, biological, and biogeochemical feedbacks that contribute to sustained degradation of these water bodies. We recognize that such a large-scale approach will not fully detail the changes at local scales, some of which are, in fact, more significant than portrayed by the regional average analysis (c.f., Beckert et al 2011;Fertig et al 2013). A central question is: to what extent are anthropogenic changes in nutrients the cause of the decline of water quality now documented?…”

Section: Introductionmentioning

confidence: 99%

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Eutrophication of a Maryland/Virginia Coastal Lagoon: a Tipping Point, Ecosystem Changes, and Potential Causes

Glibert

Hinkle

Sturgis

et al. 2013

Estuaries and Coasts

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Water quality in the Maryland/Virginia Coastal Bays has been declining for many years from anthropogenic inputs, but conditions appear to have worsened abruptly following a shift from long-term dry to long-term wet conditions in the early 2000s. Annually and regionally averaged total nitrogen concentrations are approximately twofold higher, but ammonium (NH 4 +) concentrations are up to an order of magnitude higher than in the early 1990s. Averaged nitrate concentrations, however, changed to a lesser degree throughout the time course; water column concentrations remain very low. Total phosphorus has only increased in some bay segments, but increases in phosphate (PO 4 3−) have been more pervasive. There were differences in the year in which large increases in each nutrient were first noted: PO 4 3− in~2001-2002, followed by NH 4 +~a year later. The effects of a combination of steadily increasing anthropogenic nutrient increases from development, superimposed on nutrient loads from farming and animal operations, and groundwater inputs were accelerated by changes in freshwater flow and associated, negatively reinforcing, biogeochemical responses. Regionally, chlorophyll a concentrations have increased, and submersed aquatic vegetation has decreased. The system is now characterized by sustained summer picoplanktonic algal blooms, both brown tide and cyanobacteria. The retentive nature of this coastal lagoon combined with the reducing nature of the system will make these changes difficult to reverse if the current dual nutrient management practices are not accelerated.

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37 Demography and Conservation of Deep Corals: The Study of Population Structure and Dynamics

Bramanti¹,

Santangelo²,

Benedetti³

et al. 2019

Mediterranean Cold-Water Corals: Past, Present and Future

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Elucidating terrestrial nutrient sources to a coastal lagoon, Chincoteague Bay, Maryland, USA

Cited by 14 publications

References 60 publications

Influence of nutrient input on the trophic state of a tropical brackish water lagoon

Influence of nutrient input on the trophic state of a tropical brackish water lagoon

Eutrophication of a Maryland/Virginia Coastal Lagoon: a Tipping Point, Ecosystem Changes, and Potential Causes

37 Demography and Conservation of Deep Corals: The Study of Population Structure and Dynamics

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