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  • 1. Christensen-Dalsgaard, Signe
    et al.
    Anker-Nilssen, Tycho
    Crawford, Rory
    Bond, Alexander
    Már Sigurðsson, Guðjón
    Glemarec, Gildas
    Snær Hansen, Erpur
    Kadin, Martina
    Naturhistoriska riksmuseet, Enheten för miljöforskning och övervakning.
    Kindt-Larsen, Lotte
    Mallory, Mark
    Ravn Merkel, Flemming
    Petersen, Aevar
    Provencher, Jennifer
    Bærum, Kim Magnus
    What’s the catch with lumpsuckers? A North Atlantic study of seabird bycatch in lumpsucker gillnet fisheries2019Ingår i: Biological Conservation, ISSN 0006-3207, E-ISSN 1873-2917, Vol. 240, artikel-id 108278Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Worldwide, incidental bycatch in fisheries is a conservation threat to many seabird species. Although knowledge on bycatch of seabirds has increased in the last decade, most stems from longline fisheries and the impacts of coastal gillnet fisheries are poorly understood. Gillnet fishing for North Atlantic lumpsucker (Cyclopterus lumpus) is one such fishery. We collated and synthesized the available information on seabird bycatch in lumpsucker gillnet fisheries across the entire geographical range to estimate and infer the magnitude of their impact on the affected seabird populations. Most birds killed were diving ducks, cormorants and auks, and each year locally high numbers of seabirds were taken as bycatch. We found large differences in bycatch rates among countries. The estimated mean bycatch in Iceland was 2.43 birds/trip, while the estimates in Norway was 0.44 and 0.39 birds/trip, respectively. The large disparities between estimates might reflect large spatial differences in bycatch rates, but could partly also arise due to distinctions in data recorded by onboard inspectors (Iceland), self-administered registration (Norway) and direct observations by cameras (Denmark). We show that lumpsucker gillnet fisheries might pose a significant risk to some populations of diving seabirds. However, a distinct data deficiency on seabird bycatch in terms of spatio-temporal coverage and the age and origins of the birds killed, limited our abilities to fully assess the extent and population consequences of the bycatch. Our results highlight the need for a joint effort among countries to standardize monitoring methods to better document the impact of these fisheries on seabirds.

  • 2.
    Kadin, Martina
    Naturhistoriska riksmuseet, Enheten för miljöforskning och övervakning.
    Alkfåglarnas födosök sett genom ny teknik2018Ingår i: Levande skärgårdsnatur 2018, s. 16-17Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 3.
    Kadin, Martina
    Naturhistoriska riksmuseet, Enheten för miljöforskning och övervakning.
    Niiranen, Susa
    Converse, Sarah J
    Linking demographic and food‐web models to understand management trade‐offs2019Ingår i: Ecology and Evolution, ISSN 2045-7758, E-ISSN 2045-7758Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Alternatives in ecosystem‐based management often differ with respect to trade‐offs between ecosystem values. Ecosystem or food‐web models and demographic models are typically employed to evaluate alternatives, but the approaches are rarely integrated to uncover conflicts between values. We applied multistate models to a capture–recapture dataset on common guillemots Uria aalge breeding in the Baltic Sea to identify factors influencing survival. The estimated relationships were employed together with Ecopath‐with‐Ecosim food‐web model simulations to project guillemot survival under six future scenarios incorporating climate change. The scenarios were based on management alternatives for eutrophication and cod fisheries, issues considered top priority for regional management, but without known direct effects on the guillemot population. Our demographic models identified prey quantity (abundance and biomass of sprat Sprattus sprattus) as the main factor influencing guillemot survival. Most scenarios resulted in projections of increased survival, in the near (2016–2040) and distant (2060–2085) future. However, in the scenario of reduced nutrient input and precautionary cod fishing, guillemot survival was projected to be lower in both future periods due to lower sprat stocks. Matrix population models suggested a substantial decline of the guillemot population in the near future, 24% per 10 years, and a smaller reduction, 1.1% per 10 years, in the distant future. To date, many stakeholders and Baltic Sea governments have supported reduced nutrient input and precautionary cod fishing and implementation is underway. Negative effects on nonfocal species have previously not been uncovered, but our results show that the scenario is likely to negatively impact the guillemot population. Linking model results allowed identifying trade‐offs associated with management alternatives. This information is critical to thorough evaluation by decision‐makers, but not easily obtained by food‐web models or demographic models in isolation. Appropriate datasets are often available, making it feasible to apply a linked approach for better‐informed decisions in ecosystem‐based management.

  • 4.
    Kadin, Martina
    Naturhistoriska riksmuseet, Enheten för miljöforskning och övervakning.
    Sillgrisslan - en djupgående missil in i ekosystemdynamiken2019Ingår i: Levande skärgårdsnatur, s. 8-9Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
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