Fish facilitate wave resuspension of sediment

Scheffer, Marten; Portielje, R.; Zambrano, Luis

doi:10.4319/lo.2003.48.5.1920

Cited by 92 publications

(60 citation statements)

References 23 publications

(34 reference statements)

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“…However, recent experimental studies have provided strong evidence of alternative stable states in floating aquatic vegetation (Scheffer et al 2003b), in freshwater or marine sediments (Van de Koppel et al 2001;Scheffer et al 2003a), and in benthic pond food webs (Chase 2003).…”

mentioning

confidence: 99%

Large Species Shifts Triggered by Small Forces

Nes

Scheffer

2004

The American Naturalist

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Changes in species composition of communities seem to proceed gradually at first sight, but remarkably rapid shifts are known to occur. Although disrupting disturbances seem an obvious explanation for such shifts, evidence for large disturbances is not always apparent. Here we show that complex communities tend to move through occasional catastrophic shifts in response to gradual environmental change or evolution. This tendency is caused by multiple attractors that may exist in such systems. We show that alternative attractors arise robustly in randomly generated multispecies models, especially if competition is symmetrical and if interspecific competition is allowed to exceed intraspecific competition. Inclusion of predators as a second trophic level did not alter the results greatly, although it reduced the probability of alternative attractors somewhat. These results suggest that alternative attractors may commonly arise from interactions between large numbers of species. Consequently, the response of complex communities to environmental change is expected to be characterized by hysteresis and sudden shifts. Some unexplained regime shifts observed in ecosystems could be related to alternative attractors arising from complex species interactions. Additionally, our results support the idea that ancient mass extinctions may partly be due to an intrinsic loss of stability of species configurations.

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confidence: 99%

Large Species Shifts Triggered by Small Forces

Nes

Scheffer

2004

The American Naturalist

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“…Although sediment resuspension may be most associated with wave action, bottom-feeding activity may also cause sediment resuspension (Caliman, 2005b). Scheffer et al (2003) evaluated the interaction between wave and animal activity on sediment resuspension. Through field and laboratory experiments, they showed that fish holes on the sediment decreased sediment resistance to wave actions and thus enhanced sediment resuspension (Scheffer et al, 2003).…”

Section: Causes Of Ncl Biodiversitymentioning

confidence: 99%

“…Scheffer et al (2003) evaluated the interaction between wave and animal activity on sediment resuspension. Through field and laboratory experiments, they showed that fish holes on the sediment decreased sediment resistance to wave actions and thus enhanced sediment resuspension (Scheffer et al, 2003). These results imply that management activities to restore clear-water state in NCL that are turbid due to wind resuspension must take in account the fauna that inhabit the systems.…”

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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“…By decreasing the top-down control from fish on particularly large-sized zooplankton, the aim is to increase the filtration of zooplankton capacity on phytoplankton and thereby create clearer water. Removal of benthivorous fish species such as carp (Cyprinus carpio), gizzard shad (Dorosoma cepedianum) and bream (Abramis brama) may also improve lake water quality in shallow lakes by reducing the sediment resuspension and nutrient recycling caused by their feeding activity [6,7] and possibly also by reducing the amount of loose sediment, which otherwise would be more easily resuspended by wind [8].…”

Section: Introductionmentioning

confidence: 99%

Repeated Fish Removal to Restore Lakes: Case Study of Lake Væng, Denmark—Two Biomanipulations during 30 Years of Monitoring

Søndergaard

Lauridsen

Johansson

2017

Water

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Biomanipulation by fish removal has been used in many shallow lakes as a method to improve lake water quality. Here, we present and analyse 30 years of chemical and biological data from the shallow and 16 ha large Lake Vaeng, Denmark, which has been biomanipulated twice with a 20-year interval by removing roach (Rutilus rutilus) and bream (Abramis brama). After both biomanipulations, Lake Vaeng shifted from a turbid, phytoplankton-dominated state to a clear, water macrophyte-dominated state. Chlorophyll a was reduced from 60-80 µg·L −1 to 10-30 µg·L −1 and the coverage of submerged macrophytes, dominated by Elodea canadensis, increased from <0.1% to 70%-80%. Mean summer total phosphorus was reduced from about 0.12 to 0.07 mg·L −1 and total nitrogen decreased from 1.0 to 0.4 mg·L −1 . On a seasonal scale, phosphorus and chlorophyll concentrations changed from a summer maximum during turbid conditions to a winter maximum under clear conditions. The future of Lake Vaeng is uncertain and a relatively high phosphorus loading via the groundwater, and the accumulation of a mobile P pool in the sediment make it likely that the lake eventually will return to turbid conditions. Repeated fish removals might be a relevant management strategy to apply in shallow lakes with a relatively high external nutrient loading.

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Fish facilitate wave resuspension of sediment

Cited by 92 publications

References 23 publications

Large Species Shifts Triggered by Small Forces

Large Species Shifts Triggered by Small Forces

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

Repeated Fish Removal to Restore Lakes: Case Study of Lake Væng, Denmark—Two Biomanipulations during 30 Years of Monitoring

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