Stratification in Western Lake Erie in Summer of 1953: Effects on the Hexagenia (Ephemeroptera) Population

Britt, N. Wilson

doi:10.2307/1933229

Cited by 102 publications

(77 citation statements)

References 1 publication

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“…Other studies show changes to zoobenthic community composition and biomass resulting from cultural eutrophication (Britt 1955;Nalepa 1987;Krieger and Ross 1993). This in turn results in the decline of fish growth rates for consumers that relied on zoobenthos (Schaeffer et al 2000).…”

Section: Sediment ␦mentioning

confidence: 99%

The effects of cultural eutrophication on the coupling between pelagic primary producers and benthic consumers

et al. 2005

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We investigated the effects of cultural eutrophication on the coupling between pelagic primary producers and benthic consumers in Lake Tahoe. Spatial and temporal changes in zoobenthos energetics were documented by measuring Ͼ40 yr of change in pelagic primary production through 14 C incubations, reduction in clarity by Secchi and light measurements, and sedimentation rates. Effects on zoobenthic primary consumers (oligochaete and chironomid) and an obligate benthic secondary consumer (Catostomus tahoensis) were determined by comparing ␦ 13 C values of historical and contemporary samples. A model that considers primary production (benthic or pelagic) contributions and their respective ␦ 13 C signals was used to examine the factors contributing to zoobenthic energy shifts. Spatially, zoobenthos exhibited a strong positive relationship between lake depth and pelagic isotopic signals. For depths at which ambient 1% light levels have shifted with time (50-85 m), pelagic primary producer and zoobenthic consumer coupling was positive. Historically, zoobenthos from this depth zone obtained 27% of their energy from phytoplankton sources. After 43 yr of eutrophication, they obtained 62% from pelagic sources. A simple model indicated that increased pelagic production and resultant export of matter combined with the loss of benthic primary production contributed to the change in zoobenthos energetics. This change was passed on to higher consumers, with the benthic fish Tahoe sucker (Catostomus tahoensis) now deriving ϳ21% of its energy from pelagic primary production sources. This study demonstrates how lake eutrophication increases the coupling between pelagic and benthic habitats.

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Section: Sediment ␦mentioning

confidence: 99%

The effects of cultural eutrophication on the coupling between pelagic primary producers and benthic consumers

et al. 2005

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“…Many deep lakes show thermal stratifications, e.g., North America (Britt 1955), Uganda (Melack 1978), Cameroon (Kling 1988), and Mexico (Vázquez et al 2004). The lakes in the Gokyo wetlands also showed thermal stratification in early autumn.…”

Section: Temperature and Oxygen Profilesmentioning

confidence: 99%

First results on bathymetry and limnology of high-altitude lakes in the Gokyo Valley, Sagarmatha (Everest) National Park, Nepal

Sharma

Bajracharya

et al. 2011

Limnology

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The aim of this study was to investigate for the first time the morphology, physical and chemical characteristics of three high-altitude lakes in the Gokyo Valley, Everest National Park, Nepal. The moraine-dammed glacial lakes were studied for three seasons to create baseline data. The second, third, and fourth lakes in the Gokyo Valley are deeper than previously assumed. The vertical profiles of temperature and dissolved oxygen indicated that the thermocline zone varied between 10 and 20 m below the surface during the post-monsoon season. Although most of the analyzed metal concentrations were below the level recommended by the WHO for safe drinking water, lead (Pb) and cadmium (Cd) levels exceeded the limits in some of the samples. This has created great concern for human health. The probable route of these two pollutants is monsoon precipitation that carries industrial pollutants along its route. The sedimentation rates of Gokyo Lakes range from 0.069 to 0.089 cm per annum, which is within the limits of other high-altitude lakes. The present findings created a baseline database for some of the remote high-altitude lakes in Nepal that can be used for lake management and for assessing future changes in lake characteristics in the Himalayan region.

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“…A high organic content is characteristic of substrates selected by nymphs of Hexagenia (Wright & Mattice, 1981b) . But, high organic content of a sediment also contributes to oxygen depletion and may negatively affect nymphal growth (Britt, 1955) . In our study, we assumed that food availability is a major control of mayfly population growth and productivity .…”

Section: Introductionmentioning

confidence: 99%

Production by Hexagenia limbata in a warm-water reservoir and its association with chlorophyll content of the water column

Welch

Vodopich

1989

Hydrobiologia

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We investigated the productivity of nymphs of the mayfly Hexagenia limbata in Lake Waco, a central Texas reservoir, and assessed its association with chlorophyll content of the water . We hypothesized that food availability measured as chlorophyll content of the water may directly associate with growth of Hexagenia and predict population productivity. To test this, we compared production by mayfly populations at two stations in the same reservoir ; a northern station receiving water input with high chlorophyll content, and a southern station receiving water with low chlorophyll content . Both stations had similar substrate type and abundant mayflies . Benthic samples were collected from October 1984 through September 1985, and dissolved oxygen and temperature of the water were monitored .Annual production (size-frequency method) was 1270 mg m -2 (P/B = 7 .5) at the northern station and 1990 mg M-2 (P/B = 6 .1) at the southern station . The mean standing crop was 323 mg m -2 at the southern station and 169mg m -2 at the northern station . Densities of mayflies at the two stations were not significantly different .Mean chlorophyll concentration (total mg pigment) during the sampling period was 23 .5 mg m -3 at the northern station and 16 .7 mg m -3 at the southern station . Therefore, the station with lower mean chlorophyll content had higher secondary productivity by Hexagenia . Conversely, the station with higher mean chlorophyll content had lower mayfly productivity . The productivity of the mayfly populations did not positively associate with the chlorophyll content of the water, and chlorophyll content did not predict the success of the population of Hexagenia . Variation in mayfly growth success was associated with differences in temperature and dissolved oxygen . The northern station with higher chlorophyll content and lower productivity had low dissolved oxygen and temperatures higher than optimum for growth .

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Stratification in Western Lake Erie in Summer of 1953: Effects on the Hexagenia (Ephemeroptera) Population

Cited by 102 publications

References 1 publication

The effects of cultural eutrophication on the coupling between pelagic primary producers and benthic consumers

The effects of cultural eutrophication on the coupling between pelagic primary producers and benthic consumers

First results on bathymetry and limnology of high-altitude lakes in the Gokyo Valley, Sagarmatha (Everest) National Park, Nepal

Production by Hexagenia limbata in a warm-water reservoir and its association with chlorophyll content of the water column

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