The effects of cessation of fish farming on duck breeding in French fishpond systems

Broyer, Joël; Chavas, Gilles; Chazal, Romain

doi:10.1007/s10750-016-2985-2

Cited by 5 publications

(9 citation statements)

References 16 publications

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“…() used age structure to infer a 21% increase in survivorship of largemouth bass following the establishment of cage culture in a freshwater lake, while in contrast, Broyer et al . () recorded 39% higher mortality of ducklings at fish ponds. In sea cage systems, elevated external parasitism rates (especially sea louse infections on salmonids) may increase mortality in farm‐associated fish, but to our knowledge, differential mortality between farm and reference sites has not yet been empirically demonstrated.…”

Section: Resultsmentioning

confidence: 95%

“…reproductive success) for wildlife at farms are similarly rare, but two recent examples were returned by our search, both documenting probable ecological traps: Kloskowski () reported that fledging rates of grebes nesting on fish ponds stocked with +1 carp were only 37% of those nesting on unstocked ponds, while Broyer et al . () found that high food availability was outweighed by high predation rates for ducks nesting on stocked ponds (Table ).…”

Section: Resultsmentioning

confidence: 99%

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Impacts of marine and freshwater aquaculture on wildlife: a global meta‐analysis

Barrett

Swearer

Dempster

2018

Reviews in Aquaculture

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The global expansion of aquaculture has raised concerns about its environmental impacts, including effects on wildlife. Aquaculture farms are thought to repel some species and function as either attractive population sinks ('ecological traps') or population sources for others. We conducted a systematic review and metaanalysis of empirical studies documenting interactions between aquaculture operations and vertebrate wildlife. Farms were associated with elevated local abundance and diversity of wildlife, although this overall effect was strongly driven by aggregations of wild fish at sea cages and shellfish farms (abundance: 729; species richness: 2.09). Birds were also more diverse at farms (1.19), but other taxa showed variable and comparatively small effects. Larger effects were reported when researchers selected featureless or unstructured habitats as reference sites. Evidence for aggregation 'hotspots' is clear in some systems, but we cannot determine whether farms act as ecological traps for most taxa, as few studies assess either habitat preference or fitness in wildlife. Fish collected near farms were larger and heavier with no change in body condition, but also faced higher risk of disease and parasitism. Birds and mammals were frequently reported preying on stock, but little data exist on the outcomes of such interactions for birds and mammalsfarms are likely to function as ecological traps for many species. We recommend researchers measure survival and reproduction in farm-associated wildlife to make direct, causal links between aquaculture and its effects on wildlife populations.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Impacts of marine and freshwater aquaculture on wildlife: a global meta‐analysis

Barrett

Swearer

Dempster

2018

Reviews in Aquaculture

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“…Several 421 studies noted higher fishing effort adjacent to sea cages, although we are only aware of two 422 studies that quantified fishing effort and catch rates (Akyol & Ertosluk 2010;Bacher & 423 Gordoa 2016), and none assessed fishing mortality rates among farm-associated fish. with +1 carp were only 37 % of those nesting on unstocked ponds, while Broyer et al (2017) found that high food availability was outweighed by high predation rates for ducks nesting on 430 stocked ponds (Table 1).…”

mentioning

confidence: 99%

“…Only two studies in our database estimated differential mortality rates in farm-associated 411 fauna. Kilambi et al (1978) used age structure to infer a 21 % increase in survivorship of 412 largemouth bass following the establishment of cage culture in a freshwater lake, while in 413 contrast, Broyer et al (2017) recorded 39 % higher mortality of ducklings at fish ponds. In 414 sea cage systems, elevated external parasitism rates (especially sea louse infections on 415 salmonids) may increase mortality in farm-associated fish, but to our knowledge, differential 416 mortality between farm and reference sites has not yet been empirically demonstrated.…”

mentioning

confidence: 99%

“…This latter scenario was observed by Kloskowski (2012), who reported that 553 European carp farms were acting as ecological traps for red-necked grebes, as farmed fish were too large for fledglings to consume leading to starvation. Predation risk for clutches 555 may also be elevated at farms: Broyer et al (2017) observed high densities of breeding pairs 556 and high food availability, but also high offspring mortalitya probable ecological trap.…”

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confidence: 99%

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Impacts of marine and freshwater aquaculture on wildlife: a global meta-analysis

Barrett¹,

Swearer²,

Dempster³

2018

Preprint

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Cite as: Barrett LT, Swearer SE, Dempster T (2018) Impacts of marine and freshwater aquaculture on wildlife: a global meta-analysis. Reviews in Aquaculture. Abstract 11The global expansion of aquaculture has raised concerns about its environmental impacts, 12 including effects on wildlife. Aquaculture farms are thought to repel some species and 13 function as either attractive population sinks ('ecological traps') or population sources for 14 others. We conducted a systematic review and meta-analysis of empirical studies 15 documenting interactions between aquaculture operations and vertebrate wildlife. Farms were 16 associated with elevated local abundance and diversity of wildlife, although this overall effect 17 was strongly driven by aggregations of wild fish at sea cages and shellfish farms (abundance: 18 72x; species richness: 2.0x). Birds were also more diverse at farms (1.1x), but other taxa 19 showed variable and comparatively small effects. Larger effects were reported when 20 researchers selected featureless or unstructured habitats as reference sites. Evidence for 21 aggregation 'hotspots' is clear in some systems, but we cannot determine if farms act as 22 ecological traps for most taxa, as few studies assess either habitat preference or fitness in 23 wildlife. Fish collected near farms were larger and heavier with no change in body condition, 24 but also faced higher risk of disease and parasitism. Birds and mammals were frequently 25 Cite as: Barrett LT, Swearer SE, Dempster T (2018) Impacts of marine and freshwater aquaculture on wildlife: a global meta-analysis. Reviews in Aquaculture. 2 reported preying on stock, but little data exists on the outcomes of such interactions for birds 26 and mammalsfarms are likely to function as ecological traps for many species. We 27 recommend researchers measure survival and reproduction in farm-associated wildlife to 28 make direct, causal links between aquaculture and its effects on wildlife populations. 29 30 31 population 33 35 36 Aquaculture infrastructure (farms hereafter) presents a novel environment for wild animal 37 populations. High stocking densities within farms aggregate biomass far beyond natural 38 levels (commonly 5-45 kg m -3 final biomass: FAO Fisheries and Aquaculture 2018), and in 39 open systems, provide considerable trophic subsidies for animals that take advantage of the 40 opportunity, potentially benefitting some wildlife. However, there are also deleterious effects 41 associated with proximity to farms, and the net impact of aquaculture on productivity and 42 persistence of wildlife populations will depend both on behavioural responses to farms and 43 the fitness consequences of those responses. Where individuals are attracted to a habitat that 44 confers poorer fitness outcomes than other available habitats, they have fallen into an 45

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Sustainable management of migratory European ducks: finding model species

Holopainen¹,

Arzel²,

Elmberg

et al. 2018

Wildlife Biology

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The effects of cessation of fish farming on duck breeding in French fishpond systems

Cited by 5 publications

References 16 publications

Impacts of marine and freshwater aquaculture on wildlife: a global meta‐analysis

Impacts of marine and freshwater aquaculture on wildlife: a global meta‐analysis

Impacts of marine and freshwater aquaculture on wildlife: a global meta-analysis

Sustainable management of migratory European ducks: finding model species

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