Synthesis for Management

Tedesco, Mark A.; Swanson, R. Lawrence; Stacey, Paul E.; Latimer, James S.; Yarish, Charles; Garza, Corey

doi:10.1007/978-1-4614-6126-5_7

Cited by 8 publications

(3 citation statements)

References 62 publications

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“…For urban estuaries hosting large human population centers, wastewater treatment plant discharges are often a major source of nutrients (Greening and Janicki, 2006;Tedesco et al, 2014). Environmental managers in many such systems have focused on requiring wastewater treatment facility upgrades to reduce loads.…”

Section: Introductionmentioning

confidence: 99%

Managed Nitrogen Load Decrease Reduces Chlorophyll and Hypoxia in Warming Temperate Urban Estuary

et al. 2022

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Many urban estuaries worldwide suffer from excess phytoplankton and hypoxia (low oxygen) due to high nutrient loads. A common water quality management strategy is to require wastewater treatment facility upgrades. This case study examines Narragansett Bay, a warming temperate mid-latitude urban estuary with seasonal periodic hypoxia, during June through September from 2005 to 2019. Within this period, numerous facilities were upgraded to nitrogen removal over several years. The response of the bay is more consistent with “textbook” expectations for reduced chlorophyll and hypoxia than what was seen in many other systems—despite its complex coastline geometry, numerous river inputs, and widely-distributed treatment facilities. River flow drives inter-annual variability with increased load, density stratification, chlorophyll, and hypoxia in wet years. Mean 2013-2019 bay-wide total nitrogen load was 34% less than the 2005-2012 mean, a reduction of about 106 kg yr-1, comparable to the range of flow-driven inter-annual variations. Chlorophyll Index and Hypoxia Index event-based metrics applied to high-frequency time series observations at eight sites quantify exceedances of severe and moderate thresholds. Relatively steady 33% and 16% Chlorophyll Index declines, for severe and moderate thresholds, occurred from about 2007 to 2019. The Hypoxia Index declined markedly by 2009 and 2014 for severe and moderate thresholds, respectively, and remained at or near zero from 2014 to 2019. The load reduction explains chlorophyll and hypoxia declines better than physical processes including river flow, stratification, tidal variations, winds, sea level differences, and temperatures. River flow about 55% higher than the 2005-2019 mean would increase non-treatment facility loads by an amount comparable to the managed load decrease, so future wet summers could partially reverse the improvements. Long-term trends include warming of about 0.5°C decade-1, which reduces oxygen saturation by 0.1 mg l-1 decade-1. This rate is likely a lower bound for temperature-driven oxygen decreases, because warming can also accelerate phytoplankton growth and bacterial consumption. Without warming, the managed load decrease would have curtailed hypoxia more effectively. Climate trends should be at least as important to future eutrophication as the managed load decline because, in addition to warming influences, long-term increases in river flow would increase load and stratification.

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Section: Introductionmentioning

confidence: 99%

Managed Nitrogen Load Decrease Reduces Chlorophyll and Hypoxia in Warming Temperate Urban Estuary

et al. 2022

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“…The Sound hosts commercial and recreational fishing, boating, beach recreation, as well as various flora and fauna, some of which are rare or endangered (ibid; Weigold & Pilsbury, 2014). The Sound has experienced (and continues to experience) pollution, with consequences for ecological health, and for commercial and recreational activities (Varekamp et al, 2014;Tedesco et al, 2014). Management issues are exacerbated by the Sound's unique hydrology: while the eastern end is subject to flushing from the Atlantic Ocean, the western end (which receives runoff from New York City) is closed off (see Varekamp et al, 2014 All three report cards were launched on 8 June 2015 (NFWF, 2015).…”

Section: Case Study Contexts (A) Long Island Sound Case Studymentioning

confidence: 99%

Using environmental report cards to encourage constructive stakeholder relationships in natural resource management: developing a participatory report carding process

Kung¹

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“…Seaweed aquaculture was developed in these areas to determine whether year-round seaweed aquaculture could improve water quality by removing excess nutrients. Recent studies showed that seaweed aquaculture can be an efficient way to manage nutrient issues in urbanised estuaries (Kim et al 2014(Kim et al , 2015Kraemer et al 2014;Rose et al 2015;Tedesco et al 2014). This technology is referred to as 'nutrient bioextraction' (Kim et al 2017;Rose et al 2015).…”

Section: Seaweed Farming In the Northeastmentioning

confidence: 99%

Opportunities, challenges and future directions of open-water seaweed aquaculture in the United States

2019

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Seaweed aquaculture is a relatively young industry in the United States compared to Asian countries. Early attempts at seaweed aquaculture in California, Washington State, New York and the Gulf of Maine in the 1980s and 1990s did not result in commercial production but provided important lessons. Since 2010, commercial cultivation of kelp (Saccharina latissima, Laminaria digitata, and Alaria esculenta) and other seaweeds (Palmaria palmata and Porphyra umbilicalis) began in the Gulf of Maine and Long Island Sound. Seaweed aquaculture is now a fast-growing maritime industry, especially in New England. If seaweed aquaculture is to maintain its momentum, it is important to (1) emphasise the environmental benefits; (2) domesticate a variety of local species; and (3) diversify seaweed products for food, animal feed, phycocolloids, cosmeceuticals, nutraceuticals, and ultimately biofuels if it becomes economically viable due to the cost of production. The exclusive economic zone (EEZ) of the United States offers opportunities for expansion of seaweed aquaculture in an area greater than the entire land mass of the United States and with limited user conflicts. This study reviews the past and current status of seaweed aquaculture in the United States and discusses potential opportunities and challenges of open-water seaweed aquaculture.

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Synthesis for Management

Cited by 8 publications

References 62 publications

Managed Nitrogen Load Decrease Reduces Chlorophyll and Hypoxia in Warming Temperate Urban Estuary

Managed Nitrogen Load Decrease Reduces Chlorophyll and Hypoxia in Warming Temperate Urban Estuary

Using environmental report cards to encourage constructive stakeholder relationships in natural resource management: developing a participatory report carding process

Opportunities, challenges and future directions of open-water seaweed aquaculture in the United States

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