Acid deposition and watershed characteristics in relation to lake chemistry in northeastern Minnesota

Rapp, George; Allert, James; Liukkonen, Barbara W.; Ilse, Judith A.; Loucks, Orie L.; Glass, Gary E.

doi:10.1016/0160-4120(85)90226-0

Cited by 33 publications

(13 citation statements)

References 11 publications

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“…This, in turn, implies that WLFs may affect organic carbon levels, which correlate with color in northeastern Minnesota lakes (14,23), consistent with observations in an experimental reservoir (22).…”

Section: Mercury Concentration and Fishsupporting

confidence: 76%

Relationship between Mercury Accumulation in Young-of-the-Year Yellow Perch and Water-Level Fluctuations

Sorensen

Kallemeyn

Sydor

2005

Environ. Sci. Technol.

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A three-year (2001-2003) monitoring effort of 14 northeastern Minnesota lakes was conducted to document relationships between water-level fluctuations and mercury bioaccumulation in young-of-the-year (YOY) yellow perch (Perca flavescens) collected in the fall of each year at fixed locations. Six of those lakes are located within or adjacent to Voyageurs National Park and are influenced by dams on the outlets of Rainy and Namakan lakes. One site on Sand Point Lake coincides with a location that has nine years of previous monitoring suitable for addressing the same issue over a longer time frame. Mean mercury concentrations in YOY yellow perch at each sampling location varied significantly from year to year. For the 12-year monitoring site on Sand Point Lake, values ranged from 38 ng gww(-1) in 1998 to 200 ng gww(-1) in 2001. For the 14-lake study, annual mean concentrations ranged by nearly a factor of 2, on average, for each lake over the three years of record. One likely factor responsible for these wide variations is that annual water-level fluctuations are strongly correlated with mercury levels in YOY perch for both data sets.

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Section: Mercury Concentration and Fishsupporting

confidence: 76%

Relationship between Mercury Accumulation in Young-of-the-Year Yellow Perch and Water-Level Fluctuations

Sorensen

Kallemeyn

Sydor

2005

Environ. Sci. Technol.

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“…The implied increase in water color, although time-transgressive among sites, is closely linked to the presence of humus-rich soils as inferred from chemical and pollen stratigraphy. Lakes receiving drainage from peatlands or forests with deep organic soils are typically the most highly colored (Rapp et al, 1985;Engstrom, 1987). A greater influx of dissolved humic compounds would have increased the acidity of Adirondack lakes and may have lowered primary production through sequestering of nutrients (Schindler & Jackson, 1976) or by increased light attenuation and shading (Shapiro, 1957).…”

Section: Discussionmentioning

confidence: 98%

The developmental history of Adirondack (N.Y.) lakes

et al. 1989

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We utilized paleoecological techniques to reconstruct long-term changes in lake-water chemistry, lake trophic state, and watershed vegetation and soils for three lakes located on an elevational gradient (661-1150 m) in the High Peaks region of the Adirondack Mountains of New York State (U.S.A.). Diatoms were used to reconstruct pH and trophic state. Sedimentary chrysophytes, chlorophylls and carotenoids supplied corroborating evidence. Pollen, plant macrofossils, and metals provided information on watershed vegetation, soils, and biogeochemical processes. All three lakes were slightly alkaline pH 7-8) and more productive in the late-glacial. They acidified and became less productive at the end of the late-glacial and in the early Holocene. pH stabilized 8000-9000 yr B.P. at the two higher sites and by 6000 yr B.P. at the lowest. An elevational gradient in pH existed throughout the Holocene. The highest site had a mean Holocene pH close to or below 5; the lowest site fluctuated around a mean of 6. The higher pH and trophic state of the late-glacial was controlled by leaching of base cations from fresh unweathered till, a process accelerated by the development of histosols in the watersheds as sprucedominated woodlands replaced tundra. An apparent pulse of lake productivity at the late-glacialHolocene boundary is correlated with a transient, but significant, expansion of alder (Alnus crispa) populations. The alder phase had a significant impact on watershed (and hence lake) biogeochemistry. The limnological changes of the Holocene and the differences between lakes were a function of an elevational gradient in temperature, hydrology (higher precipitation and lower evapotranspiration at higher elevation), soil thickness (thinner tills at higher elevation), soil type (histosols at higher elevation), vegetation (northern hardwoods at lower elevation, spruce-fir at higher), and different Holocene vegetational sequences in the three watersheds.

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“…However, the models formed for larger and heterogeneous areas have been shown to result in stronger explanatory power than models formed for areas with a very homogeneous land use suggested by Herlihy et al (1998) and confirmed by the study of Rantakari et al (2004) based on Finnish lake catchments. Moreover, Rapp et al (1985) have suggested that the extremes tend to balance each other to produce 'average' situation when catchment size increases. Our regression models predicting the impact of land use cover on the DOM export are based on the largest river basins in Finland representing mixed land use which indicates that our models can be assumed to be applicable to similar conditions in the northern boreal zone.…”

Section: Impact Of Land Use Covermentioning

confidence: 98%

Export of DOM from Boreal Catchments: Impacts of Land Use Cover and Climate

2005

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Dissolved organic matter (DOM) is an important fraction in carbon (C) and nutrient budgets for aquatic ecosystems and can have broad effects on food webs and nutrient cycling. To look at the role land use cover and climate might play in DOM transport from the boreal region, the export of total organic carbon (TOC), total organic nitrogen (TON) and dissolved organic phosphorus (DOP) was estimated for Finnish main rivers and their sub-catchments, altogether 86 catchments, situated between latitudes 60°N and 69°N and covering 297,322 km 2 , 88% of the total area of Finland. On an average, 94% of the TOC, 90% of the total nitrogen (TN) and 40% of the total phosphorus (TP) in Finnish rivers was in a dissolved form. The majority of the DOM export from Finnish catchments consists of organic C. The TOC export increased with increasing peatland proportion (r = 0.39, p = 0.003), while TON export increased with the increasing percentage of agricultural land (r = 0.60, p < 0.001). Although upstream lakes covered only on average 9% of the catchment area, they were the most important predictor for TOC, TON and DOP export (r = À0.83, r = À0.82 and r = À0.61, respectively). The higher the upstream lake percentage, the lower the export indicating organic matter retention in lakes.

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Acid deposition and watershed characteristics in relation to lake chemistry in northeastern Minnesota

Cited by 33 publications

References 11 publications

Relationship between Mercury Accumulation in Young-of-the-Year Yellow Perch and Water-Level Fluctuations

Relationship between Mercury Accumulation in Young-of-the-Year Yellow Perch and Water-Level Fluctuations

The developmental history of Adirondack (N.Y.) lakes

Export of DOM from Boreal Catchments: Impacts of Land Use Cover and Climate

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