Impacts of increased sediment loads on the ecology of lakes

Donohue, Ian; Molinos, Jorge García

doi:10.1111/j.1469-185x.2009.00081.x

Cited by 144 publications

(96 citation statements)

References 216 publications

(277 reference statements)

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“…Increases or decreases in water clarity can negatively impact biological components of the system that may be adapted to specific light-penetrating conditions [3][4][5]. While some systems are adapted to poor water clarity conditions [6], many lakes and rivers are characterized by clear water and are negatively impacted by reductions in light penetration [7].…”

Section: Introductionmentioning

confidence: 99%

Reconstructing Turbidity in a Glacially Influenced Lake Using the Landsat TM and ETM+ Surface Reflectance Climate Data Record Archive, Lake Clark, Alaska

et al. 2015

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Lake Clark is an important nursery lake for sockeye salmon (Oncorhynchus nerka) in the headwaters of Bristol Bay, Alaska, the most productive wild salmon fishery in the world. Reductions in water clarity within Alaska lake systems as a result of increased glacial runoff have been shown to reduce salmon production via reduced abundance of zooplankton and macroinvertebrates. In this study, we reconstruct long-term, lake-wide water clarity for Lake Clark using the Landsat TM and ETM+ surface reflectance products and in situ water clarity data collected between 2009 and 2013. Analysis of a Landsat scene acquired in 2009, coincident with in situ measurements in the lake, and uncertainty analysis with four scenes acquired within two weeks of field data collection showed that Band 3 surface reflectance was the best indicator of turbidity (r 2 = 0.55, RMSE << 0.01). We then processed 151 (98 partial-and 53 whole-lake) Landsat scenes using this relation and detected no significant long-term trend in mean turbidity for Lake Clark This study demonstrates the utility of hindcasting turbidity in a glacially influenced lake using the Landsat surface reflectance products. It may also help land and resource managers reconstruct turbidity records for lakes that lack in situ monitoring, and may be useful in predicting future water clarity conditions based on projected climate scenarios.

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Section: Introductionmentioning

confidence: 99%

Reconstructing Turbidity in a Glacially Influenced Lake Using the Landsat TM and ETM+ Surface Reflectance Climate Data Record Archive, Lake Clark, Alaska

et al. 2015

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“…This not only results in a loss of habitat to species that require interstitial space, such as mayflies and stoneflies, but increases the susceptibility of certain invertebrates to predation by fish [3]. Elevated fine sediment loadings have different effects on hyporheic exchange and associated ecological processes (e.g., nitrogen and carbon cycling) depending on local hydrologic and geomorphic conditions [60,[63][64][65]. Although alteration of streambed habitat is recognized as one of the most important stressors of benthic organisms, the reliability of findings from existing embeddedness methodologies have been questioned due to substantial variation in their quantification and assumptions [66].…”

Section: Clean Sediments As Stressorsmentioning

confidence: 99%

Assessing contaminated sediments in the context of multiple stressors

Burton

Johnston

2010

Enviro Toxic and Chemistry

144

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Abstract-Sediments have a major role in ecosystem functioning but can also act as physical or chemical stressors. Anthropogenic activities may change the chemical constituency of sediments and the rate, frequency, and extent of sediment transport, deposition, and resuspension. The importance of sediments as stressors will depend on site ecosystem attributes and the magnitude and preponderance of co-occurring stressors. Contaminants are usually of greater ecological consequence in human-modified, depositional environments, where other anthropogenic stressors often co-occur. Risk assessments and restoration strategies should better consider the role of chemical contamination in the context of multiple stressors. There have been numerous advances in the temporal and spatial characterization of stressor exposures and quantification of biological responses. Contaminated sediments causing biological impairment tend to be patchy, whereas more pervasive anthropogenic stressors, such as alterations to habitat and flow, physical disturbance, and nutrient addition, may drive large-scale ecosystem responses. A systematic assessment of relevant ecosystem attributes and reference conditions can assist in understanding the importance of sediments in the context of other stressors. Experimental manipulations then allow for the controlled study of dominant stressors and the establishment of causal links. This approach will result in more effective management of watersheds and waterways. Environ. Toxicol. Chem. 2010;29:262529: -264329: . # 2010

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“…1 E-mail: garciamj@tcd.ie widespread human stressors on aquatic ecosystems; increased loading of sediments (Donohue and Garcı´a Molinos 2009) and nutrients (Donohue et al 2009, Smith andSchindler 2009), on the biota of a headwater stream. Specifically, we assessed the individual and combined effects of sediment and nutrient disturbances under three distinct temporal regimes (regular and temporally variable pulses and an undisturbed treatment) on both periphyton and benthic invertebrate assemblages.…”

Section: Introductionmentioning

confidence: 99%

Interactions among temporal patterns determine the effects of multiple stressors

Molinos

Donohue

2010

Ecological Applications

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Abstract. Recent research has revealed that one of the most important characteristics of both natural and anthropogenic disturbances is their temporal heterogeneity. However, little is known about the relative importance of interactions among temporal patterns of multiple stressors. We established a fully factorial field experiment to test whether interactions among temporal patterns of two globally important anthropogenic disturbances of aquatic ecosystems (increased sediment loading and nutrient enrichment) determined the responses of stream benthic assemblages. Each disturbance treatment comprised three distinct regimes: regular and temporally variable pulses and an undisturbed control. The overall frequency, intensity and extent of disturbance was, however, equal across all disturbed treatments. We found that interactions among temporal disturbance regimes determined the effects of the compounded sediment and nutrient perturbations on algal biomass and the diversity, taxonomic and trophic composition of benthic assemblages. Moreover, our results also show that the temporal synchronization of multiple stressors does not necessarily maximize the impact of compounded perturbations. This comprises the first experimental evidence that interactions among the temporal patterns of disturbances drive the responses of ecosystems to multiple stressors. Knowledge of the temporal pattern of disturbances is therefore essential for the reliable prediction of impacts from, and effective management of, compounded perturbations.

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Impacts of increased sediment loads on the ecology of lakes

Cited by 144 publications

References 216 publications

Reconstructing Turbidity in a Glacially Influenced Lake Using the Landsat TM and ETM+ Surface Reflectance Climate Data Record Archive, Lake Clark, Alaska

Reconstructing Turbidity in a Glacially Influenced Lake Using the Landsat TM and ETM+ Surface Reflectance Climate Data Record Archive, Lake Clark, Alaska

Assessing contaminated sediments in the context of multiple stressors

Interactions among temporal patterns determine the effects of multiple stressors

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