Oxygen Deficits, Clarity, and Eutrophication in some Madison Lakes

Stewart, Kenton M.

doi:10.1002/iroh.3510610502

Cited by 46 publications

(25 citation statements)

References 35 publications

(18 reference statements)

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“…In Northern Hemisphere mid-latitude areas such as New England, ice-out dates can serve as useful indicators of late winter and early spring climate change. Changes over time in lake ice-out dates can have important effects on aspects of lake ecology, such as the rate of summer oxygen depletion (Stewart, 1976), and the productivity and abundance of phytoplankton (Maeda and Ichimura, 1973) and organisms at higher trophic levels (Porter et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Historical changes in lake ice‐out dates as indicators of climate change in New England, 1850–2000

Hodgkins,

James,

Huntington

2002

Intl Journal of Climatology

126

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Various studies have shown that changes over time in spring ice-out dates can be used as indicators of climate change. Ice-out dates from 29 lakes in New England (USA) with 64 to 163 years of record were assembled and analysed for this study. Ice-out dates have become significantly earlier in New England since the 1800s. Changes in ice-out dates between 1850 and 2000 were 9 days and 16 days in the northern/mountainous and southern regions of New England respectively. The changes in the ice-out data over time were very consistent within each of the two regions of New England, and more consistent than four air-temperature records in each region. The ice-out dates of the two regions had a different response to changes in air temperature. The inferred late winter-early spring air-temperature warming in both regions of New England since 1850, based on linear regression analysis, was about 1.5°C. Published in

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Section: Introductionmentioning

confidence: 99%

Historical changes in lake ice‐out dates as indicators of climate change in New England, 1850–2000

Hodgkins,

James,

Huntington

2002

Intl Journal of Climatology

126

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“…Such a borderline might not only be relevant for the rate of change in the timing of lake ice breakup but also for the rate of change of processes that are related to the timing of lake ice breakup. Related processes are for example, the production and biodiversity of phytoplankton (Rodhe 1955;Weyhenmeyer et al 1999;Phillips and Fawley 2002) and the occurrence of winter fish kills (Greenbank 1945;Barica and Mathias 1979) due to changes in the underwater light climate (Leppäranta et al 2003), nutrient recycling (Järvinen et al 2002) and oxygen conditions (Stewart 1976;Livingstone 1993). Here I hypothesize that water chemical processes that are related to the timing of lake ice breakup, i.e.…”

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confidence: 97%

Water chemical changes along a latitudinal gradient in relation to climate and atmospheric deposition

Weyhenmeyer

2007

Climatic Change

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Evaluating trends over time (nonparametric Mann-Kendall test) for 18 water chemical variables from 79 reference lakes, distributed all over Sweden, during spring since 1984 showed most significant trends for atmospheric deposition driven sulfate (SO 4 ) concentrations. The decrease in SO 4 concentrations was on average 2.7 times higher at lower (56°N to 59°N) than at higher latitudes (60°N to 68°N). This large difference in the rate of change between lower and higher latitudes could not solely be explained by atmospheric deposition as the rates of change in SO 4 wet deposition differed by a factor of only 1.5 between lower and higher latitudes. Significantly higher rates of change at lower than at higher latitudes are known from the timing of lake ice breakup, a typical climate change indicator. The rates of change in the timing of lake ice breakup differed by a factor of 2.3 between lower and higher latitudes. Other water chemical variables showing significantly higher rates of change at lower than at higher latitudes were water color (a factor of 3.5), calcium (a factor of 2.9), magnesium (a factor of 5.5) and conductivity (a factor of 5.9). The rates of change of all these variables were strongly related to the rates of change in the timing of lake ice breakup along a latitudinal gradient (R 2 =0.41-0.78, p<0.05), suggesting that climatic changes can accelerate atmospheric driven changes at especially lower latitudes. This acceleration will result in more heterogeneous lake ecosystems along a latitudinal gradient.

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“…was similar to that found in Lake Mendota in early years before 1965 . While the extent and duration of anoxia in Lake Mendota have not changed since the early 1900s (Stewart, 1976 ;Brock, 1985), other signs of eutrophication in Lake Mendota have occurred that may have adversely affected the profundal sediment environment for zoobenthos survival .…”

Section: Discussionmentioning

confidence: 99%

“…data). Although variable from year to year, summer DO depletion rates for the hypolimnion also were determined by Stewart (1976) and Brock (1985) to not have changed between early and more recent years .…”

Section: Introductionmentioning

confidence: 99%

Decline in zoobenthos densities in the profundal sediments of Lake Mendota (Wisconsin, USA)

Lathrop

1992

Hydrobiologia

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High densities of zoobenthos inhabited Lake Mendota's profundal zone in the early 1900s through the mid-1940s . Chaoborus punctipennis was the most abundant organism during the winter, along with moderate densities of Chironomus spp ., Pisidium sp ., oligochaetes, and Procladius sp. By the early 1950s, Chaoborus punctipennis densities had declined to 10% of former levels, while Chironomus increased significantly . However, by the mid-1960s, Chaoborus, Chironomus, and Pisidium densities had decreased to very low population levels . By 1987-89, Pisidium was no longer found . Zoobenthos that had not decreased from earlier surveys were oligochaetes and Procladius, although further sampling of oligochaetes is needed to confirm current densities . These organisms are the most tolerant of severe anoxia .Four possible reasons for this decline were evaluated : (a) decline in food availability, (b) increase in fish predation, (c) use of toxic insecticides in the drainage basin, and (d) changes in the profundal sediment environment . Based on literature information and long-term data for Lake Mendota, a change in the profundal sediment environment is the most likely explanation for the decline in the less-tolerant zoobenthos species . Although the duration and extent of anoxia in the hypolimnion have not changed since the early 1900s, hypolimnetic ammonia and hydrogen sulfide concentrations apparently have increased as Mendota became more eutrophic after the mid-1940s . However, further study is needed to determine if these higher concentrations or other factors were responsible for the dramatic decline in lake Mendota's profundal zoobenthos . 353

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Oxygen Deficits, Clarity, and Eutrophication in some Madison Lakes

Cited by 46 publications

References 35 publications

Historical changes in lake ice‐out dates as indicators of climate change in New England, 1850–2000

Historical changes in lake ice‐out dates as indicators of climate change in New England, 1850–2000

Water chemical changes along a latitudinal gradient in relation to climate and atmospheric deposition

Decline in zoobenthos densities in the profundal sediments of Lake Mendota (Wisconsin, USA)

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