Influence of glacial turbidity and climate on diatom communities in two Fjord Lakes (British Columbia, Canada)

Laird, Kathleen R.; Barouillet, Cécilia; Cumming, Brian F.; Perrin, Christopher J.; Selbie, Daniel T.

doi:10.1007/s00027-020-00767-3

Cited by 8 publications

(2 citation statements)

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“…It is also clear that dissolved nutrients from their catchments affect the nutrient status of lakes. Moreover, fine sediments, such as glacial flour, contribute to the turbidity of lakes (Laird et al, 2021). There are several reviews of the roles of lakes within fluvial networks for providing habitats (Arostegui & Quinn, 2019;Lennox et al, 2021), modifying nutrient and flow regimes (Baker et al, 2016;Jones, 2010;Leach & Laudon, 2019), and altering thermal patterns.…”

Section: Introductionmentioning

confidence: 99%

Stream inflows to lake deltas: A tributary junction that provides a unique habitat in lakes

2021

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1. Tributary junctions in stream networks provide unique habitats within fluvial networks by contributing differently sized sediment and organic materials, providing temperature refuge, and other conditions distinct from the receiving stream.These same attributes at tributaries entering lakes (inflow streams) support special, within-lake locations that are used by several organisms at some times of year, which we call lake deltas.2. Here we consider the evidence of these lake deltas as a special environment in terms of their physical, chemical, and biological characteristics. There are several potential contributions from tributary streams, and much of the emphasis has been on resource subsidies to lakes, but other factors may also contribute to the uniqueness of lake deltas.3. The degree to which these deltas provide productivity and biodiversity hotspots is not well known, but we present evidence in support of this assertion. We also offer suggestions for a suite of hypotheses that can be tested. These junctions may also provide an excellent model system for testing the consequences of resource subsidies (organic matter, invertebrates) to recipient communities from small to mid-sized streams.4. Consolidation of these ideas will allow testing for the uniqueness of these lake delta habitats and the mechanisms responsible, and perhaps promote greater efforts at protecting processes that sustain these areas in lakes.

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Section: Introductionmentioning

confidence: 99%

Stream inflows to lake deltas: A tributary junction that provides a unique habitat in lakes

2021

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“…In a study of 18 glacier-fed lakes with widely varying turbidity, glacial particles accounted for about two thirds of light attenuation across all lakes, rising to 90% for lakes with high turbidity ( NTU, [ 38 ]). Since sunlight is a fundamental component of many physical, chemical, and biological processes, understanding the effect of glacially-turbid inflows on the light regime in a reservoir is needed for understanding the ecological function of the reservoir [ 2 , 25 , 43 ] and for informing reservoir management decisions [ 3 , 15 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Fate of turbid glacial inflows in a hydroelectric reservoir

2021

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Turbidity from glacial meltwater limits light penetration with potential ecological consequences. Using profiles of temperature, conductivity, and turbidity, we examine the physical processes driving changes in the epilimnetic turbidity of Carpenter Reservoir, a long and narrow, glacier-fed reservoir in southwest British Columbia, Canada. Following the onset of permanent summer stratification, the relatively dense inflows plunged into the hypolimnion, and despite the high glacial load entering the reservoir, the epilimnion cleared due to particle settling. Using a one-dimensional (longitudinal) diffusion equation for a decaying substance to describe the variation in epilimnetic turbidity, we obtain two nondimensional parameters: the epilimnetic inflow parameter, $$\mathcal {I}$$ I , a measure of the turbidity flux into the epilimnion; and the dispersion parameter, $${\mathcal {D}}$$ D , a measure of longitudinal dispersion. In the case of Carpenter Reservoir: $$\mathcal {I}\ll 1$$ I ≪ 1 , indicating that turbidity declines over the summer; and $${\mathcal {D}}\ll 1$$ D ≪ 1 , indicating a strong gradient in turbidity along the epilimnion. Using our theoretical formulation of epilimnetic turbidity variations in conjunction with monthly field surveys, we compute the particle settling velocity ($${\sim}{0.25}\,{\hbox {m}\,\hbox {d}^{-1}}$$ ∼ 0.25 m d - 1 ), the longitudinal dispersion coefficient (50–70 $${\hbox {m}^{2}\,\hbox {s}^{-1}}$$ m 2 s - 1 ), and the flux of turbid water into the epilimnion ($${\sim }1{\%}$$ ∼ 1 % of the total inflow). Our approach is applicable to other reservoirs and can be used to investigate changes in turbidity in response to changes in $$\mathcal {I}$$ I and $${\mathcal {D}}$$ D .

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Modern diatom assemblages and their association with meteorological conditions in two lakes in northeastern Poland

Szczerba

Rzodkiewicz

Tylmann

2023

Ecological Indicators

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Influence of glacial turbidity and climate on diatom communities in two Fjord Lakes (British Columbia, Canada)

Cited by 8 publications

References 84 publications

Stream inflows to lake deltas: A tributary junction that provides a unique habitat in lakes

Stream inflows to lake deltas: A tributary junction that provides a unique habitat in lakes

Fate of turbid glacial inflows in a hydroelectric reservoir

Modern diatom assemblages and their association with meteorological conditions in two lakes in northeastern Poland

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