Effects of the invasive red king crab on food web structure and ecosystem properties in an Atlantic fjord

Pedersen, Torstein; Fuhrmann, Mona M.; Lindstrøm, Ulf; Nilssen, Einar M.; Ivarjord, Trond; Ramasco, Virginie; Jørgensen, Lis Lindal; Sundet, Jan H.; Sivertsen, Knut; Källgren, Emma; Hjelset, Ann Merete; Michaelsen, Christer; Systad, Geir Helge; Norrbin, Fredrika; Svenning, Martin‐A.; Bjørge, Arne; Steen, Henning; Nilssen, Kjell Tormod

doi:10.3354/meps12548

Cited by 22 publications

(25 citation statements)

References 127 publications

(158 reference statements)

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“…There is evidence that species composition in the Barents Sea is shifting as communities move farther north with the warming waters (Kortsch et al, 2012;Frainer et al, 2017). In addition, the Barents Sea is not unaffected by the scourge of introduced species invasions, including the deliberate introduction of red king crab (Paralithodes camtschaticus), which can result in changes in food web, trophic, and community structure (Pedersen et al, 2018). As such, both climate change and introduced species may be contributing to changes in catch and catch composition that this study could not address.…”

Section: Limitationsmentioning

confidence: 99%

Reconstructed Russian Fisheries Catches in the Barents Sea: 1950-2014

Popov

Zeller

2018

Front. Mar. Sci.

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Section: Limitationsmentioning

confidence: 99%

Reconstructed Russian Fisheries Catches in the Barents Sea: 1950-2014

Popov

Zeller

2018

Front. Mar. Sci.

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“…Fjord ecosystems in Finnmark are perhaps more accurately described as part of the open Barents Sea marine ecosystem neighboring the fjord system, and thus always influenced by larger-scale fluctuations originating from outside the fjord (Jakobsen and Ozhigin 2011). The long and wide fjord is divided in two by a shelf, with warmer, Atlantic water conditions characterizing the outer parts, while low temperatures of a polar character dominate the inner part (Pedersen et al 2018). Due to lack of data on local temperature variations, local ecosystem variability has been seen in relation to changes in ocean temperature in the North Atlantic Ocean from the 1940s onwards.…”

Section: Study Area and Methodsmentioning

confidence: 99%

“…However, through various research projects, the Institute of Marine Research initiated local acoustic trawl surveys of the fjord, first in 1992 and then annually from 1995 as part of the marine research cruises. Sporadically at first, and then with a concentrated effort from 2009 to 2011, the Institute of Marine Research carried out ecosystem surveys in the Porsanger fjord system as part of the research project EPIGRAPH (see, e.g., Pedersen et al 2018). The project gathered data on the fjord ecosystem over a number of years, and then modeled impacts of the invasive species red king crab, using Ecopath.…”

Section: Study Area and Methodsmentioning

confidence: 99%

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Social–ecological timelines to explore human adaptation to coastal change

Brattland

Eythórsson

Weines

et al. 2018

Ambio

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Through the construction of a socio-ecological timeline for the Porsanger fjord ecosystem, this article illustrates the different ways in which environmental and social–ecological changes have influenced the adaptations of rural households in coastal Sami communities in Finnmark, north Norway. The main finding is that, although environmental change in the form of seal invasions and dwindling fish stocks directly impacted the fisheries, the introduction of a new vessel quota system decisively changed adaptive capacity and coastal Sami household adaptation strategies. These changes represented a tipping point for the social–ecological system in the period between 1986 and 1990. It is thus important to discuss the ways in which governance systems may facilitate actions to adapt to climate and biodiversity change and foster sustainable rural livelihood systems in coastal Norway. Based on traditional and local ecological knowledge on the state of the ecosystem prior to the tipping point, two relevant actions to increase the resilience of the system were identified: ensuring the possibility of re-entry into fisheries as part of rural livelihood combinations, and ecological restoration of kelp beds. Flexible diversification of livelihoods allows exploitation of a range of adjacent species without large investments in a fossile fuel-driven fisheries economy. Investing in regrowth of macroalgae to foster cod nursery areas and increase carbon sequestration can be a relevant alternative for communities that are interested in contributing to climate change mitigation on a larger scale.

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“…RKC is one of the largest crabs in the world and is omnivorous, feeding on a wide range of benthic infauna, epifauna and algae (Falk-Petersen et al 2011). These characteristics make the RKC able to impact the composition, biomass and abundance of the native benthic community in the southern Barents Sea (Pavlova 2008, Falk-Petersen et al 2011, Fuhrmann et al 2015, Pedersen et al 2018. Since 2008, there has been a dual management effort for RKC in Norwegian waters: maintaining a harvestable population within a quota restricted area (east of 26°E and to the Russian border) and preventing a southward spread west of this area (west of 26°E) (FKD 2007).…”

Section: Introductionmentioning

confidence: 99%

Temporal and spatial dynamics of the invasive red king crab and native brachyuran and anomuran larvae in Norwegian waters

Michelsen¹,

Nilssen²,

Pedersen³

et al. 2020

Aquat. Biol.

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This study investigates the temporal and spatial patterns of larval stages of the invasive red king crab Paralithodes camtschaticus (RKC) and co-existing native brachyurans and anomurans in a Norwegian fjord. It is one of few field studies describing the larval stage of native and invasive brachyurans and anomurans in the southern Barents Sea. Larvae were collected at 6 to 18 stations at roughly 1 to 2 mo intervals over a 1.5-yr period. To help explain timing in hatch of RKC larvae, the reproductive state of females was determined. The first larval stage of RKC was found in higher abundances in shallow bays, reflecting the spawning migrations of reproducing females. RKC was the first species among anomurans and brachyurans to release their larvae in Norwegian waters, and due to an extended larval release (January−May) their larvae occurred for the longest period of time in the water column. The native boreo-Arctic Pagurus pubescens and Hyas araneus released their larvae early in the year, starting in March. In contrast, larvae of the native boreal Pagurus bernhardus, Hyas coarctatus and Munida sp. were observed later in spring and summer. The combination of protracted hatching, high fecundity and high adult abundance of RKC are likely strong contributing factors to the species' successful establishment in the southern Barents Sea and could favour the dispersal of RKC south along the Norwegian coast and potentially north into Arctic shelf areas.

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Effects of the invasive red king crab on food web structure and ecosystem properties in an Atlantic fjord

Cited by 22 publications

References 127 publications

Reconstructed Russian Fisheries Catches in the Barents Sea: 1950-2014

Reconstructed Russian Fisheries Catches in the Barents Sea: 1950-2014

Social–ecological timelines to explore human adaptation to coastal change

Temporal and spatial dynamics of the invasive red king crab and native brachyuran and anomuran larvae in Norwegian waters

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