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Marine Ecology Progress Series

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MEPS 596:13-31 (2018)  -  DOI:

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

Torstein Pedersen1,*, Mona M. Fuhrmann1, Ulf Lindstrøm2, Einar M. Nilssen1, Trond Ivarjord1, Virginie Ramasco2, Lis L. Jørgensen2, Jan H. Sundet2, Knut Sivertsen1, Emma Källgren1, Ann Merete Hjelset2, Christer Michaelsen1, Geir Systad3, Fredrika Norrbin1, Martin-A. Svenning4, Arne Bjørge2, Henning Steen2, Kjell T. Nilssen2

1Department of Arctic and Marine Biology, UiT -The Arctic University of Norway, 9037 Tromsø, Norway
2Institute of Marine Research, 9294 Tromsø, Norway
3Bergen Department, Norwegian Institute for Nature Research, 5008 Bergen, Norway
4Department of Arctic Ecology, Fram Center, Norwegian Institute for Nature Research (NINA), 9296 Tromsø, Norway
*Corresponding author:

ABSTRACT: Since the 1990s, the density of the invasive red king crab Paralithodes camtschaticus has increased dramatically in coastal areas in northern Norway. We investigated its direct and indirect effects on food web structure and ecosystem properties (e.g. species biomasses and production) in the Porsanger Fjord in the study period 2009-2011 using 5 subarea Ecopath food web models. The 5 baseline models with different red king crab densities were compared and the food web effects of crab removal were explored through simulations in Ecosim. King crabs were important as benthic predators and exerted strong top-down effects on long-living invertebrates such as predatory gastropods, asteroids, detritivorous echinoderms and herbivorous sea urchins. The crab experienced little predation from fish or other predators at higher trophic levels, thus food web effects of the red king crab generally stayed within the benthic compartment. Red king crab removal decreased system omnivory and resulted in higher food web biomass-low turnover systems, with relatively lower production:biomass ratios of benthic invertebrates. Other ecosystem properties (e.g. total production, consumption, ascendancy and overhead) were little affected by crab abundance and suggest stable systems. Effects of crab removal were less significant in baseline models with low initial crab biomass, and high benthic production by detritivores in the inner fjord may buffer future predation in this area. Indirect effects of crab predation included a positive cascade effect on macroalgae due to predation on herbivorous sea urchins and a negative effect on benthic-feeding birds, indicating competition for invertebrate prey.

KEY WORDS: Paralithodes camtschaticus · Food web model · Coastal ecosystem · Invasion · Trophic impact · Predation · Barents Sea · Benthic invertebrates

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Cite this article as: Pedersen T, Fuhrmann MM, Lindstrøm U, Nilssen EM and others (2018) Effects of the invasive red king crab on food web structure and ecosystem properties in an Atlantic fjord. Mar Ecol Prog Ser 596:13-31.

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