Decreases in primary production in Onondaga Lake from reductions in point source inputs of phosphorus

Effler, Adam J. P.; Gelda, Rakesh K.; Effler, Steven W.; Matthews, David A.; Field, Stephen D.; Hassett, James M.

doi:10.1127/1863-9135/2008/0172-0239

Cited by 25 publications

(36 citation statements)

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“…The lake is now poised for further decreases in primary production. Proportionate further decreases from reductions in total external effective P loading are a reasonable expectation (Effler et al 2008a). This, together with the increased relative contributions from the tributaries associated with the reductions in TP Metro/L , has increased the importance of assessment of the magnitude and origins of the tributary sources to guide of the ongoing rehabilitation program.…”

Section: Cultural Eutrophication P Management and Lake Responsesmentioning

confidence: 99%

“…This lack of response was attributed to the great extent to which the lake had been "overloaded". The previous reductions in TP Metro/L had been inadequate to shift the lake from a nutrient-saturated to a nutrient-limited system (Effler et al 2008a). Internal loading of P to the productive layers during summer stratification has been minor compared to external loading because of limited vertical transport from the hypolimnion (Effler et al 2002).…”

Section: Cultural Eutrophication P Management and Lake Responsesmentioning

confidence: 99%

“…In the late 1990s Metro was responsible for ∼85% of the total effective P load (available to support summertime primary production; i.e., bioavailable and reaches productive layers) to the lake (Effler et al 2002). Despite a 97% reduction in TP Metro/L from the early 1970s to early 2000s, levels of primary production in the lake decreased by only 30-40% (Effler et al 2008a). This lack of response was attributed to the great extent to which the lake had been "overloaded".…”

Section: Cultural Eutrophication P Management and Lake Responsesmentioning

confidence: 99%

“…The P load from Metro has been the primary driver of cultural eutrophication in the lake (Effler et al 2005, Effler et al 2008a. Concentrations of TP in this effluent (TP Metro ), and thereby its TP load (TP Metro/L ), have decreased in response to multiple management actions, including a ban on high P content detergents within the service area in 1971 (Murphy 1973) and treatment upgrades, particularly in 1979 (secondary treatment), 1981 (tertiary treatment) and 2005 (high rate flocculated settling).…”

Section: Cultural Eutrophication P Management and Lake Responsesmentioning

confidence: 99%

“…Proportional decreases in TP Metro/L and primary production from 2002 to 2005 indicated a shift from a nutrient-saturated to a P-limited state in response to the mandated treatment upgrade (Effler et al 2008a). The lake is now poised for further decreases in primary production.…”

Section: Cultural Eutrophication P Management and Lake Responsesmentioning

confidence: 99%

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Partitioning phosphorus concentrations and loads in tributaries of a recovering urban lake

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Section: Cultural Eutrophication P Management and Lake Responsesmentioning

confidence: 99%

Section: Cultural Eutrophication P Management and Lake Responsesmentioning

confidence: 99%

Section: Cultural Eutrophication P Management and Lake Responsesmentioning

confidence: 99%

Section: Cultural Eutrophication P Management and Lake Responsesmentioning

confidence: 99%

Section: Cultural Eutrophication P Management and Lake Responsesmentioning

confidence: 99%

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Partitioning phosphorus concentrations and loads in tributaries of a recovering urban lake

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High-frequency metabolism study in a large and shallow temperate lake reveals seasonal switching between net autotrophy and net heterotrophy

et al. 2012

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Respiratory CO 2 release from inland waters is a major process in the global carbon cycle, retaining more than half of the carbon flux from terrestrial sources that otherwise would reach the sea. The strongly lake type-specific balance between primary production and respiration determines whether a lake acts regionally as a net sink or source of CO 2 . This study presents two-year (2009, 2010) results of high-frequency metabolism measurements in the large and shallow polymictic eutrophic Lake Võrtsjärv (area 270 km 2 ; mean depth 2.8 m). We estimated the net ecosystem production (NEP), community respiration (R) and gross primary production (GPP) from continuous measurements of oxygen, irradiance, wind and water temperature. A sinusoidal model fitted to the calculated metabolic rates showed the prevalence of net autotrophy (mean GPP:R [ 1) from early spring until August/September, whereas during the rest of the year heterotrophy (mean GPP:R \ 1) prevailed, characterizing the lake as CO 2 neutral on an annual basis. Community respiration lagged behind GPP by approximately 2 weeks, which could be explained by the bulk of the phytoplankton biomass accounted for by filamentous cyanobacteria that are considered mostly inedible to zooplankton, and the seasonally increasing role of sediment resuspension. In the warmer year 2010, the seasonal peaks of GPP, R and NEP were synchronously shifted nearly 1 month earlier compared with 2009. The strong stimulating effect of temperature on both GPP and R and its negative effect on NEP revealed by the multiple regression analysis suggests increasing metabolic rates and increasing heterotrophy in this lake type in a warmer climate.

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Annually laminated sediments from Onondaga Lake, New York (USA) provide a basis for high-resolution studies of lake degradation and recovery

et al. 2014

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Decreases in primary production in Onondaga Lake from reductions in point source inputs of phosphorus

Cited by 25 publications

References 0 publications

Partitioning phosphorus concentrations and loads in tributaries of a recovering urban lake

Partitioning phosphorus concentrations and loads in tributaries of a recovering urban lake

High-frequency metabolism study in a large and shallow temperate lake reveals seasonal switching between net autotrophy and net heterotrophy

Annually laminated sediments from Onondaga Lake, New York (USA) provide a basis for high-resolution studies of lake degradation and recovery

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