Lake Eutrophication at the Urban Fringe, Seattle Region, USA

Moore, Jonathan W.; Schindler, Daniel E.; Scheuerell, Mark D.; Smith, Danielle; Frodge, Jonathan

doi:10.1579/0044-7447-32.1.13

Cited by 64 publications

(45 citation statements)

References 48 publications

(68 reference statements)

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“…Additionally, Smith (1983) found that Nfixing cyanobacteria dominated lake phytoplankton communities at an N : P mass ratio of , 29 : 1, suggesting that organisms experience intense N limitation well above the classic Redfield N : P ratio. In fact, the lakes receiving nutrient loads below this threshold in our study have seen increased dominance by cyanobacteria in recent years (Moore et al 2003;King County Small Lakes Program unpubl. data).…”

Section: Discussionmentioning

confidence: 61%

“…We surveyed 27 lakes in the Greater Seattle region that spanned a large gradient of shoreline development and anthropogenic P loading (Moore et al 2003), ranging from lakes within protected watersheds in the University of British Columbia's Malcolm Knapp Research Forest to urban lakes with 100% shoreline development. These lakes are physically similar: all are summer stratified, with a mean depth of 8 m (6 0.9 SE), average surface area of 2.97 km 2 (6 0.52 SE), and lie between 35 and 1121 m above sea level (Moore et al 2003;Francis et al 2011).…”

Section: Methodsmentioning

confidence: 99%

“…These lakes are physically similar: all are summer stratified, with a mean depth of 8 m (6 0.9 SE), average surface area of 2.97 km 2 (6 0.52 SE), and lie between 35 and 1121 m above sea level (Moore et al 2003;Francis et al 2011). All lakes have some combination of stocked or native populations of rainbow trout (Oncorhynchus gairdnerii), cutthroat trout (Oncorhynchus clarkii), largemouth bass (Micropterus salmoides), and similar assemblages of zooplankton including abundant representatives from the genera Ceriodaphnia, Cyclops, Diaptomus, Daphnia, and Bosmina (Francis et al 2011).…”

Section: Methodsmentioning

confidence: 99%

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Untitled

2012

Limnology & Oceanography

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Runoff from human-dominated watersheds has greatly altered nitrogen (N) and phosphorus (P) cycling in lakes. Nutrients from human sources are distinct from those from undisturbed ecosystems in several ways including lower N : P ratios, which can drive ecosystems to N-limited conditions, and enriched stable N isotope ratios. In this study, we used these distinct characteristics to estimate shifts in N sources to 27 lakes across a human density gradient in western Washington. We compared an N stable isotope two-source mixing model with a mixing model that coupled N stable isotopes to N : P stoichiometry and included N fixation. We found that a two-source mixing model (human and watershed sources) did not explain observed variation in d 15 N of particulate organic matter (POM) and primary consumers (R 2 5 0.60) as well as a model that included a third N source (N fixation; R 2 5 0.72). When fixed N was facultatively added to the ecosystem below a critical N : P ratio, the more complex mixing model captured the observed patterns in POM and primary-consumer d 15 N among lakes extremely well. In lakes with P concentrations . 20 mg L 21 (N : P mass ratio , 15.3), N fixation became an increasingly important component of the N cycle, accounting for . 50% of lake N budgets. This model provides a novel way to estimate the contribution of nonpoint N sources and N fixation to lakes in watersheds subject to human nutrient inputs.

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Section: Discussionmentioning

confidence: 61%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Untitled

2012

Limnology & Oceanography

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“…Residential development as a result of population growth is associated with environmental impact, including nutrient pollution and the subsequent eutrophication of lakes [4]. Maintaining and preserving water quality in Lake Powsinkowskie on the outskirts of Warsaw has been a long-standing goal of residents and other interest groups.…”

Section: Introductionmentioning

confidence: 99%

Risk Assessment of Urban Lake Water Quality Based on in-situ Cyanobacterial and Total Chlorophyll-a Monitoring

Kalaji¹,

Sytar²,

Brestič³

et al. 2016

Pol. J. Environ. Stud.

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The aim of this study was to establish a simple and cost-effective method to monitor the effects of harmful algal blooms as exemplifi ed in Lake Powsinkowskie, and to link the monitoring results to potential health risks on the basis of established Alert Level Frameworks.An assessment of the severity of cyanobacterial development in Lake Powsinkowskie (52°9'27"N, 21°5'55"E), located in the Wilanów region, Warsaw, Poland, was performed to illustrate this. An Alert Level Framework based on cyanobacterial chlorophyll-a measurements was applied. Measurements of cyanobacterial chlorophyll-a in Lake Powsinkowskie were performed once per week at 10 locations on each side of the lake from May to July 2012. The highest algal densities were expected at the eastern side of the lake due to the use of fertilizers on the fi elds along the eastern shore, however, the opposite was observed. It seems that the conditions on the west side of the lake were more favourable for cyanobacterial growth.This study shows that an indication of the overall effects of eutrophication on algal growth and the potential risk of the presence of toxic cyanobacteria can easily be obtained using relatively simple, simultaneous measurements of total and cyanobacterial chlorophyll-a. The Alert Level Framework based on cyanobacterial chlorophyll-a levels is a rapid and easily applicable method for determining the severity of cyanobacterial developments.The fi ndings of this study indicate that a reduction in nutrient loading to protect Lake Powsinkowskie's unique species richness can be achieved by informing the local residents about the effects of draining cesspools directly into the lake. Studies such as this one can thus help to support awareness-raising among lake-side residents.

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“…In addition, human population growth and urbanization of rural areas have increased development pressure on lakes, and there is growing concern Understanding the consequences of residential development is therefore critical for understanding the ecology of lake ecosystems. A growing number of studies have found negative relationships between lakeshore development and water quality (Moore et al 2003); habitat structure (Christensen et al 1996, Jennings et al 2003, Francis and Schindler 2006; and population dynamics and community structure of primary producers (Radomski and Goeman 2001, Jennings et al 2003, Rosenberger et al 2008, macroinvertebrates (Banziger 1995, Brauns et al 2007, and fishes (Bryan and Scarneccia 1992, Jennings et al 1999, Schindler et al 2000, Radomski and Goeman 2001, Scheuerell and Schindler 2004, Sass et al 2006, Wagner et al 2006. These comparative studies provide much needed information linking shoreline development and key lake characteristics.…”

mentioning

confidence: 99%