Key landscape factors for Eurasian otter Lutra lutra visiting rates and fish loss in estuarine fish farms

Sales-Luís, Teresa; Freitas, Dália; Santos‐Reis, Margarida

doi:10.1007/s10344-009-0250-y

Cited by 16 publications

(7 citation statements)

References 28 publications

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“…Shellfish farms also increase local abundance of generalist or molluscivorous 489 bird functional groups (Roycroft et al 2004;Kirk et al 2007), but others, such as 490 invertivorous wading birds, may be displaced by shellfish farm infrastructure or associated 491 ecological changes (Kelly et al 1996;Godet et al 2009;Broyer & Calenge 2010). and estuarine sea cages in Europe Sales-Luis et al 2009), but our search 502 did not reveal any data on abundance or attraction to farms relative to natural waterways. Our meta-analysis indicated that farm-associated fish tend to be larger and heavier, a finding 509 that is consistent with either aggregation of adult fish or higher growth rates due to a trophic 510 subsidy.…”

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confidence: 84%

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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mentioning

confidence: 84%

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

Barrett¹,

Swearer²,

Dempster³

2018

Preprint

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“…In Lithuania, various companies, state fish hatcheries and farmers engaged in fish farming own more than 12,000 ha of ponds (Pečiukėnas 2006;Baltrūnaitė, unpubl.). The diet of the otter (Kortan et al 2007;Ludwig et al 2002;Lanszki et al 2007;Marques et al 2007;Georgiev 2008), damage extent (Kranz 2000;Kloskowski 2005a, b;Wísniows-ka 2006), predator -human conflicts and their solution mechanisms (Myšiak et al 2004;Freitas et al 2007;Schwerdtner & Gruber 2007;Sales-Luís et al 2009) are now widely discussed in many studies. There is no data on the otter diet in fish farms in Lithuania.…”

Section: Introductionmentioning

confidence: 99%

Diet of Otters in Fish Farms in Lithuania

Baltrūnaitė

2009

Acta Zoologica Lituanica

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The diet of the otter (Lutra lutra) was studied in three fish farms and a state hatchery in Lithuania in 2006-2007 by spraints analysis. The relative frequency of occurrence (O) and biomass consumed (B) were estimated. Fish made the bulk of the otter diet and was the only important food item (68.0-96.7% O, 87.5-99.8% B). Other items (mammals, birds, amphibians, crustacean, insects, and molluscs) generally comprised a minor part of the diet (3.3-32.0% O, 0.2-12.5% B) with significantly higher consumption in the warm season. The carp (Cyprinus carpio) predominated among fish (30.5-76.0% of annual biomass), and consumption of other species varied depending on the study site.

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“…The evidence-based knowledge concerning habitat requirements of the otter and habitat characteristics driving spatiotemporal variability of its population is crucial for effective conservation of the species. Moreover, bearing in mind potential otter–human interaction and conflicts in the context of fishery production (e.g., Sales-Luis et al 2009; Kloskowski 2011), data on habitat correlates of the Eurasian otter are needed for proper population management of this species. The aim of this study was to examine the Eurasian otter population trends and to assess habitat correlates explaining occurrence of the species in Central Poland along two decades.…”

Section: Introductionmentioning

confidence: 99%

Habitat correlates of the Eurasian otter Lutra lutra recolonizing Central Poland

2012

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The increase in Eurasian otter Lutra lutra populations in their natural range and recolonization processes are recently observed in several European countries. We address the process of otter recolonization and habitat utilization in Central Poland over 14 years. Field surveys in 1998 and 2007 documented increase in occurrence of the species. The frequency of positive sites denoted 15 % in 1993, 38 % in 1998, and 89 % in 2007. Otter occurrence at study sites was positively affected by river width while negatively affected by presence of buildings at the site and river regulation. During the most intensive colonization process in the 1990s, the habitat preferences of the otter did not change. However, the sites inhabited by otters after 1998 were characterized by lower river width and tree cover and were more often located on regulated river sections, suggesting change in habitat tolerance during expansion. The otter abundance in transformed habitats is a result of increasing population numbers and the necessity to inhabit suboptimal sections of watercourses. Thus, it seems that presence–absence data for otter populations cannot be considered a reliable indicator of habitat quality, being depended of the population density.

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Key landscape factors for Eurasian otter Lutra lutra visiting rates and fish loss in estuarine fish farms

Cited by 16 publications

References 28 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

Diet of Otters in Fish Farms in Lithuania

Habitat correlates of the Eurasian otter Lutra lutra recolonizing Central Poland

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