Eutrophication and freshwater fisheries

Winfield, Ian J.

doi:10.1002/9781118394380.ch54

Cited by 7 publications

(6 citation statements)

References 92 publications

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“…Such contaminants do not have to be directly damaging to fish to have an adverse impact. For example, the widespread problem of eutrophication is commonly driven by an excess of macronutrients such as phosphorus which have been added to catchments to increase agricultural productivity (Winfield, ). Although the resulting elevations in phosphorus concentrations do not impinge on fish directly, they can have significant indirect effects by reducing oxygen availability, increasing sedimentation on spawning grounds and altering competitive balances.…”

Section: Threats To Freshwater Fishesmentioning

confidence: 99%

Fish conservation in freshwater and marine realms: status, threats and management

Arthington

Dulvy

Gladstone

et al. 2016

Aquatic Conservation

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1. Despite the disparities in size and volume of marine and freshwater realms, a strikingly similar number of species is found in eachwith 15 150 Actinopterygian fishes in fresh water and 14 740 in the marine realm. Their ecological and societal values are widely recognized yet many marine and freshwater fishes increasingly risk local, regional or global extinction.2. The prevailing threats in aquatic systems are habitat loss and degradation, invasive species, pollution, over-exploitation and climate change. Unpredictable synergies with climate change greatly complicate the impacts of other stressors that threaten many marine and freshwater fishes.3. Isolated and fragmented habitats typically present the most challenging environments for small, specialized freshwater and marine fishes, whereas overfishing is by far the greatest threat to larger marine and freshwater species. Species that migrate within or between freshwater and marine realms may face high catchability in predictable migration bottlenecks, and degradation of breeding habitat, feeding habitat or the intervening migration corridors.4. Conservation reserves are vital to protect species-rich habitats, important radiations, and threatened endemic species. Integration of processes that connect terrestrial, freshwater and marine protected areas promises more effective conservation outcomes than disconnected reserves. Diadromous species in particular require more attention in aquatic restoration and conservation planning across disparate government agencies. 5. Human activities and stressors that increasingly threaten freshwater and marine fishes must be curbed to avoid a wave of extinctions. Freshwater recovery programmes range from plans for individual species to recovery of entire basin faunas. Reducing risks to threatened marine species in coastal habitats also requires conservation actions at multiple scales. Most of the world's larger economically important fisheries are relatively well-monitored and well-managed but there are urgent needs to curb fishing mortality and minimize catch of the most endangered species in both realms.

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Section: Threats To Freshwater Fishesmentioning

confidence: 99%

Fish conservation in freshwater and marine realms: status, threats and management

Arthington

Dulvy

Gladstone

et al. 2016

Aquatic Conservation

Self Cite

376

282

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“…). Cyanobacterial blooms are perhaps best known for production of toxins, but massive blooms of non‐toxin‐producing species also can increase pH, hypoxia, and total ammonia concentrations, all of which can affect the survival of fish (Winfield ).…”

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confidence: 99%

Mortality of Endangered Juvenile Lost River Suckers Associated with Cyanobacteria Blooms in Mesocosms in Upper Klamath Lake, Oregon

et al. 2020

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Unsustainably high mortality within the first 2 years of life prevents endangered Lost River Suckers Deltistes luxatus in Upper Klamath Lake, Oregon, from recruiting to spawning populations. Massive blooms of the cyanobacterium Aphanizomenon flos-aquae and their subsequent death and decay in the lake (bloom-crashes) are associated with high pH, low percent oxygen saturation, high total ammonia concentrations, and spikes in the cyanotoxin microcystin. Poor water quality within the lake is considered the most likely cause of juvenile sucker mortality, but mechanisms causing the high mortality are not known. We introduced PIT-tagged age-1 Lost River suckers into three continuously monitored mesocosms in Upper Klamath Lake to determine the timing of juvenile sucker mortality relative to pH, temperature, and dissolved oxygen. Mortality was inferred from a lack of movement detected on remote PIT tag detection equipment within each mesocosm. Mortality was compared among mesocosms and an indoor tank-held control group. We fitted time-varying Cox hazard models to test hypotheses about short-term and chronic effects of single

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“…The problems in the case of Chitgar Lake are not uncommon in nature. For instance, eutrophication, which is defined as the addition of excess nutrients to a water body, is a widespread environmental problem facing both natural and artificial lakes (Winfield, 2015). Scholars discussed that due to the "rate of tourism activities in the upstream" and also "the entry of pollutions related to restaurants and villages to the river" (Kan River, source of the water supply of the lake), the level of nutrients in the lake has been affected (Bayat et al, 2019(Bayat et al, , p. 1447.…”

Section: Discussionmentioning

confidence: 99%

Industrialization of Nature in the Time of Complexity Unawareness: The Case of Chitgar Lake, Iran

Akhshik

Rezapouraghdam

Ramkissoon

2020

Journal of Hospitality & Tourism Research

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To find answers to the challenges linked with ecological well-being, policymakers and authorities now prefer the ecosystem-based approach, as the solutions inspired by nature may deflect from ecological collapse. Nature-based solutions (NBS) are rhapsodized both in practice and academia as a means to achieve sustainable development. However, NBS, which inherently is supposed to bring forth positive outcomes, may also lead to unsustainable turmoil. On the other hand, the majority of the studies about NBS are from Western countries and studies focusing on the paradoxical functionality of NBS are scant, especially in the Middle East. In an attempt to bridge this gap, the current study uses one of the largest blue artificial infrastructures in the Middle East as a case. Following the phenomenological interpretive approach, the authors argue that NBS may fabricate unintended problems when the complexity of the supra systems are overlooked. Theoretical and practical contributions are discussed.

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Eutrophication and freshwater fisheries

Cited by 7 publications

References 92 publications

Fish conservation in freshwater and marine realms: status, threats and management

Fish conservation in freshwater and marine realms: status, threats and management

Mortality of Endangered Juvenile Lost River Suckers Associated with Cyanobacteria Blooms in Mesocosms in Upper Klamath Lake, Oregon

Industrialization of Nature in the Time of Complexity Unawareness: The Case of Chitgar Lake, Iran

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