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- Ahlbeck Bergendahl, Ida, et al.
(author)
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Fisk- och skaldjursbestånd i hav och sötvatten 2016 : Resursöversikt
- 2016
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Reports (other academic/artistic)abstract
- I rapporten kan du ta del av bedömningen som görs av situationen för bestånd som regleras inom ramen för EU:s gemensamma fiskeripolitik (GFP). Bedömningarna baseras på det forskningssamarbete och den rådgivning som sker inom det Internationella Havsforskningsrådet (ICES).De bestånd som förvaltas nationellt baseras på de biologiska underlagen, och rådgivningen i huvudsak på den forskning och övervakning samt analys som bedrivs av Institutionen för akvatiska resurser vid Sveriges lantbruksuniversitet (SLU Aqua) samt yrkesfiskets rapportering.Rapporten omfattar 41 fiskarter uppdelade i olika bestånd, samt sju skal- och blötdjursarter.Nytt för årets upplaga är kapitlet om ekosystemtjänster. Avsnittet beskriver de fördelar människan får genom ekosystemen, till exempel hur fisk och skaldjur kommer till nytta för människan genom föda, rekreation och biologisk mångfald. Nytt för i år är också att rapportens diagram och figurer anpassats för läsare med defekt färgseende.Översikten är utarbetad av SLU Aqua på uppdrag av Havs- och vattenmyndigheten.
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| 2. |
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| 3. |
- Ahlbeck Bergendahl, Ida, et al.
(author)
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Fisk- och skaldjursbestånd i hav och sötvatten 2017 : Resursöversikt
- 2017
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Reports (other academic/artistic)abstract
- I rapporten kan du ta del av bedömningen som görs av situationen för bestånd som regleras inom ramen för EU:s gemensamma fiskeripolitik (GFP). Bedömningarna baseras på det forskningssamarbete och den rådgivning som sker inom det Internationella Havsforskningsrådet (ICES).De bestånd som förvaltas nationellt baseras på de biologiska underlagen, och rådgivningen i huvudsak på den forskning och övervakning samt analys som bedrivs av Institutionen för akvatiska resurser vid Sveriges lantbruksuniversitet (SLU Aqua) samt yrkesfiskets rapportering.Rapporten omfattar 41 fiskarter och sju skaldjursarter.Nytt för i år är att vi även beskriver fritidsfisket mer utförligt. Det fisket får allt större betydelse för utvecklingen av många av Sveriges bestånd av fisk- och skaldjur, till exempel sötvattens- och kustlevande arter som abborre, gädda, gös, lax, röding och öring, liksom marina arter som torsk och hummerÖversikten är utarbetad av SLU Aqua på uppdrag av Havs- och vattenmyndigheten.
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| 4. |
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| 5. |
- Bryhn, Andreas, et al.
(author)
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Fisk- och skaldjursbestånd i hav och sötvatten 2019 : Resursöversikt
- 2020
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Reports (other academic/artistic)abstract
- Fisken i havet är en resurs som rör sig fritt över nationella gränser. EU har därför en gemensam fiskeripolitik (GFP). Många arter som är viktiga för Sverige regleras inte i GFP och förvaltas därför nationellt.Denna rapport syftar till att:beskriva utvecklingen av fiskeripolitikenförklara den nuvarande politikens mål och regelverk och dess relation till mål och regler på miljöområdetförklara politikens nationella genomförande och det nationella handlingsutrymmetexemplifiera hur Havs- och vattenmyndigheten arbetat med att reglera fisket.
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| 6. |
- Casini, Michele, et al.
(author)
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Assessing the overlap between fishing activities and chondrichthyans distribution exposes high-risk areas for bycatch of threatened species
- 2023
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Other publication (other academic/artistic)abstract
- Sharks, rays, and chimaeras (chondrichthyans) play a crucial role in marine ecosystem functioning but are highly vulnerable to fishing. Hence, understanding the spatial overlap between chondrichthyans and fishing effort is essential for effective conservation and management. Here, we propose an integrated approach that combines Vessel Monitoring System data with geostatistical species distribution models to assess the potential impact of fishing on chondrichthyan populations in the western Adriatic Sea. By mapping the overlap between model-based chondrichthyan distribution, species richness, and the proportion of threathened species with bottom trawl fishing activities, we identify areas at high risk for chondrichthyan bycatch. Our findings show that many of these species are at risk across a large part of their distribution within the study area. Notably, there is a substantial spatial overlap between regions where threatened chondrichthyans are found and species-rich areas with locations of intensive bottom trawl fishing in the northern and central offshore regions of the western Adriatic, emphasizing the vulnerability of these species to fishing pressure. Furthermore, differences in overlap between distinct fishing gears highlight the importance of considering specific fishing practices when formulating management strategies. While our work provides novel insights to potential bycatch hotspots, limitations related to data sources, spatial resolution, and the inability to directly quantify fishing impacts should be considered. Nonetheless, our findings contribute to the development of targeted conservation and spatial management measures, offering a general approach to study model-based spatial hotspots aimed at protecting and sustaining chondrichthyan populations in the heavily exploited Adriatic Sea.
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| 7. |
- Gårdmark, Anna, et al.
(author)
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Temperature-Dependence Assumptions Drive Projected Responses of Diverse Size-Based Food Webs to Warming
- 2024
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In: Earth's Future. - 2328-4277. ; 12
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Journal article (peer-reviewed)abstract
- Food web projections are critical for evaluating potential risks to ecosystems and fisheries under global warming. The temperature dependence of biological processes and regional differences in food web structure are two important sources of uncertainty and variation in climate forced projections of fish communities, but we do not know their magnitude or relative contribution. Here we systematically evaluated a range of different assumptions about temperature-dependence on rates, including size-dependent effects, controlling food intake, metabolism, and non-predation mortality in fishes using species-resolved size spectrum food web models that link individual-level physiological processes to population and community dynamics. We simulated the physiological effect of warming in a range of size-structured food web models calibrated to different marine ecosystems and in simplified trait-based models. Higher food intake in warmed conditions increased total fish biomass, catches, and mean body weight, but these effects were offset by the negative effects of warming on metabolism and mortality, which combined resulted in lower total biomasses and catches for most food webs. These effects were enhanced when warming increased metabolic rates more than food intake, and the outcomes were also sensitive to size dependency of temperature responses. Importantly, these general patterns were not uniform across all food webs-individual functional groups and fish species within food webs responded to warming in different ways depending on their position in the food web and its structure. Hence, caution is warranted when generalizing food web or species outcomes to warming because they are mediated by community interactions. Uncertainty related to temperature dependence and ecological interactions will impact food web projections and should be represented in climate change projections.Multi-species models are often used to predict how climate change will affect marine ecosystems, fisheries yields and conservation. However, temperature can affect species in a variety of ways, making predictions challenging. Moreover, warming driven changes in a fish community will also depend on species interactions, potentially amplifying or dampening warmingdriven effects in individual species. We explored how 2 degrees C of warming may impact fish biomasses, yields and sizes using six models developed for different marine food webs and three theoretical models with different assumptions about species interactions. We found that, overall, warming tended to result in lower biomasses and fisheries yields, but slightly larger average fish sizes. Yet, results differed depending on how we modeled temperature effects on species food intake and energy expenditure. Moreover, even under the same assumptions about temperature impacts, models developed for different ecosystems behaved differently showing that species interactions will modify warming effects, making general predictions difficult. To make better predictions on warming impacts and more informed adaptation strategies we urgently need more work to understand how temperature affects individual species and communities. Meanwhile, models predicting ecosystems responses to warming should more clearly account for the uncertainty in temperature effects on fishes.Assumptions regarding how temperature drives biological rates strongly influence food web responses to warming Community interactions further modify outcomes to warming which complicate efforts to generalize warming responses across food webs Uncertainty in food web temperature dependences should be represented in climate change projections
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| 8. |
- Hansen, Henry H.
(author)
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A Spatial Scale Approach to Fish Habitat Ecology and Impacted Rivers
- 2024
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Doctoral thesis (other academic/artistic)abstract
- Fish biodiversity in rivers is threatened by continual habitat loss. Evidence to support management and restoration of rivers requires information about the specific habitat requirements for entire fish communities. The complexity of this topic, combined with additional challenges of multiple stressors, data limitation, and natural dynamics of rivers, facilitates novel model development for both applied and theoretical arenas. Central to this area of study is the importance of spatial scale. Spatial scale is the context on which measurements, models, management, and policy have the potential to synchronize in an effective manner. The forefront and progress of river restoration depends on the provisioning of timely evidence for decision-making that comes directly from models. This thesis explores and develops a spatial scale approach to model fish communities and habitat in impacted rivers. I present a comprehensive vision of how the spatial scale approach can be implemented across spatial scales. I then introduce new models at each individual scale: micro-scale, meso-scale, macro-scale, riverscape-scale, and beyond-riverscape-scale. For each scale, I studied a different river or system of rivers from around the world. The variety of modeling techniques I used highlighted new opportunities to extend models for methods in river restoration such as flow regime management, fish passage construction, dam removal, non-native fish regulation, and plastic pollution reduction. Advancements for future models and limitations are discussed in the context of spatial scale and interdisciplinarity.
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