Empirical evidence of the importance of sediment resuspension in lakes

Evans, R. Douglas

doi:10.1007/bf00005727

Cited by 183 publications

(132 citation statements)

References 25 publications

(32 reference statements)

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“…Sediment trap studies are known to be subject to inherent "overtrapping" processes that are likely to overestimate actual sediment accumulation rates measured in the sediment cores (Pennington, 1974;Evans, 1994). However, the calcite accumulation rates in the sediment traps are only about 20% higher than the calculated average calcite accumulation rates from the Baldeggersee core and, therefore, are acceptable as being within reasonable error.…”

Section: Sediment Trap Accumulationsmentioning

confidence: 95%

A study of oxygen isotopic fractionation during bio-induced calcite precipitation in eutrophic Baldeggersee, Switzerland

Teranes

McKenzie

Bernasconi

et al. 1999

Geochimica et Cosmochimica Acta

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Abstract-In order to better understand environmental factors controlling oxygen isotope shifts in autochthonous lacustrine carbonate sequences, we undertook an extensive one-year study (March, 1995 to February, 1996 of water-column chemistry and daily sediment trap material from a small lake in Central Switzerland. Comparisons between calculated equilibrium isotope values, using the fractionation equation of Friedman and O'Neil (1977) and measured oxygen isotope ratios of calcite in the sediment-traps reveal that oxygen isotopic values of autochthonous calcite (␦ 18 O) are in isotopic equilibrium with ambient water during most of the spring and summer, when the majority of the calcite precipitates. In contrast, small amounts of calcite precipitated in early-spring and again in late-autumn are isotopically depleted in 18 O relative to the calculated equilibrium values, by as much as 0.8‰. This seasonally occurring apparent isotopic nonequilibrium is associated with times of high phosphorous concentrations, elevated pH (ϳ8.6) and increased [CO 3 2Ϫ ] (ϳ50 mol/l) in the surface waters. The resulting weighted average ␦ 18 O value for the studied period is Ϫ9.6‰, compared with a calculated equilibrium ␦ 18 O value of Ϫ9.4‰. These data convincingly demonstrate that ␦ 18 O of calcite are, for the most part, a very reliable proxy for temperature and ␦ 18 O of the water.

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Section: Sediment Trap Accumulationsmentioning

confidence: 95%

A study of oxygen isotopic fractionation during bio-induced calcite precipitation in eutrophic Baldeggersee, Switzerland

Teranes

McKenzie

Bernasconi

et al. 1999

Geochimica et Cosmochimica Acta

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“…Moreover, the great influence of sediment composition, especially grain size, on sediment resuspension has been verified in many lakes (e.g., Somlyody et al 1990). Other studies have shown wind speed and effective lake fetch strongly correlate with sediment resuspension (Douglas et al 2000, van Duin et al 2001, Evans 1994.…”

Section: Introductionmentioning

confidence: 92%

Attenuation of Photosynthetically Available Radiation by Chlorophyll, Chromophoric Dissolved Organic Matter, and Tripton in Lake Donghu, China

Yang¹,

Xie²,

Xing³

et al. 2005

Journal of Freshwater Ecology

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“…A review of field studies in a range of aquatic ecosystems showed that 85% of the resuspendend matter flux to the sediment may be due to resuspended material (Evans, 1994), and that such processes may be an especially dominant cause of turbidity in large shallow lakes (Sheffer, 1998). Although sediment resuspension may be most associated with wave action, bottom-feeding activity may also cause sediment resuspension (Caliman, 2005b).…”

Section: Causes Of Ncl Biodiversitymentioning

confidence: 99%

Neotropical coastal lagoons: an appraisal of their biodiversity, functioning, threats and conservation management

et al. 2008

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Neotropical coastal lagoons (NCL) are human-dominated ecosystems. Their distribution along densely populated coastal areas of developing countries makes these systems among the most threatened in the world. Here, we summarize some aspects of the causes and consequences of NCL biodiversity, their functioning, their importance to the surrounding populations, their fragility, and their responses to local and global anthropogenic impacts and the challenges that Neotropical countries face in conserving these systems. Although still scarce and geographically concentrated, a growing body of studies has shown that NCLs are physiographically diversified systems, which harbor a considerable and particular proportion of the Neotropical inland aquatic biodiversity. Despite the fact that coastal lagoons are ecotones that are intricately connected to surrounding environments, they develop mechanisms for structural and functional regulation, which confer to these systems higher productivity and carrying capacities than surrounding ecosystems. Such traits attract residential developments and subsidize local traditional populations with important economic and aesthetic ecosystem revenues such as fisheries and scenic beauty. However, the disorganized human occupation around NCLs are causing profound impacts such as eutrophication, salinization, exotic species introduction, as well as other effects, which are ultimately imposing major habitat degradations and biodiversity extirpations in NCLs. We argue that interdisciplinary conservation strategies, which integrate scientific expertise, government officials, private companies and the general public, are the most likely to overcome the geographic and economic obstacles to NCL conservation.Keywords: coastal ecosystems, ecosystem management, shallow lakes, human impacts, tropical limnology.Lagoas costeiras neotropicais: Uma apreciação sobre sua biodiversidade, funcionamento, principais ameaças e estratégias de conservação ResumoAs lagoas costeiras neotropicais (LCN) estão inseridas em um ambiente antropogênico. Sua localização em regiões costeiras densamente povoadas de países em desenvolvimento coloca estes ecossistemas entre os mais impactados do mundo. Neste trabalho, resumimos vários aspectos relacionados às causas e conseqüências da sua biodiversidade, seu funcionamento e os bens proporcionados à população do seu entorno. Sua fragilidade e as respostas a impactos humanos locais e globais, assim como os desafios para a sua conservação por países neotropicais, também são abordados. Apesar de escassos e geograficamente concentrados, um número crescente de estudos tem mostrado que as LCN são sistemas fisiograficamente diversificados, abrigando uma proporção considerável da biodiversidade dos ambientes aquáticos continentais neotropicais. Apesar de as lagoas costeiras representarem ecótonos bastante conectados ao ambiente adjacente, elas desenvolveram mecanismos próprios de regulação funcional e estrutural, conferindo uma maior produtividade e capacidade de suporte em relação...

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Empirical evidence of the importance of sediment resuspension in lakes

Cited by 183 publications

References 25 publications

A study of oxygen isotopic fractionation during bio-induced calcite precipitation in eutrophic Baldeggersee, Switzerland

A study of oxygen isotopic fractionation during bio-induced calcite precipitation in eutrophic Baldeggersee, Switzerland

Attenuation of Photosynthetically Available Radiation by Chlorophyll, Chromophoric Dissolved Organic Matter, and Tripton in Lake Donghu, China

Neotropical coastal lagoons: an appraisal of their biodiversity, functioning, threats and conservation management

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