A review of the battle for food in the Barents Sea: cod vs. marine mammals

Bogstad, Bjarte; Gjøsæter, Harald; Haug, Tore; Lindstrøm, Ulf

doi:10.3389/fevo.2015.00029

Cited by 67 publications

(58 citation statements)

References 69 publications

(89 reference statements)

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“…The concomitant decline of silicate concentrations in NAW 63 may also contribute to the success of non-silicifying and small phytoplankton such as Ehux 64 . In addition, a change toward temperate pelagic species could have an impact on energy transfer to higher trophic levels 65 including marine mammals and commercial fish stocks 66 . Considering the role of "bio-advection" in ecological models (i.e., trait-based and niche-based approaches) must improve predictions of community shifts 67 .…”

Section: Resultsmentioning

confidence: 99%

Faster Atlantic currents drive poleward expansion of temperate phytoplankton in the Arctic Ocean

et al. 2020

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The Arctic marine biome, shrinking with increasing temperature and receding sea-ice cover, is tightly connected to lower latitudes through the North Atlantic. By flowing northward through the European Arctic Corridor (the main Arctic gateway where 80% of in-and outflow takes place), the North Atlantic Waters transport most of the ocean heat, but also nutrients and planktonic organisms toward the Arctic Ocean. Using satellite-derived altimetry observations, we reveal an increase, up to two-fold, in North Atlantic current surface velocities over the last 24 years. More importantly, we show evidence that the North Atlantic current and its variability shape the spatial distribution of the coccolithophore Emiliania huxleyi (Ehux), a tracer for temperate ecosystems. We further demonstrate that bio-advection, rather than water temperature as previously assumed, is a major mechanism responsible for the recent poleward intrusions of southern species like Ehux. Our findings confirm the biological and physical "Atlantification" of the Arctic Ocean with potential alterations of the Arctic marine food web and biogeochemical cycles.

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Section: Resultsmentioning

confidence: 99%

Faster Atlantic currents drive poleward expansion of temperate phytoplankton in the Arctic Ocean

et al. 2020

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“…; Bogstad et al . ). The response of a marine ecosystem to changes of one stock depends on the type of trophic control, that is bottom‐up or top‐down (Frank et al .…”

Section: From Drivers To Processes: Physiological and Ecological Procmentioning

confidence: 97%

Modelling climate change impacts on marine fish populations: process‐based integration of ocean warming, acidification and other environmental drivers

et al. 2016

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Global climate change affects marine fish through drivers such as ocean warming, acidification and oxygen depletion, causing changes in marine ecosystems and socioeconomic impacts. While experimental and observational results can inform about anticipated effects of different drivers, linking between these results and ecosystem‐level changes requires quantitative integration of physiological and ecological processes into models to advance research and inform management. We give an overview of important physiological and ecological processes affected by environmental drivers. We then provide a review of available modelling approaches for marine fish, analysing their capacities for process‐based integration of environmental drivers. Building on this, we propose approaches to advance important research questions. Examples of integration of environmental drivers exist for each model class. Recent extensions of modelling frameworks increase the potential for including detailed mechanisms and improving model projections. Experimental results on energy allocation, behaviour and physiological limitations will advance the understanding of organism‐level trade‐offs and thresholds in response to multiple drivers. More explicit representation of life cycles and biological traits can improve description of population dynamics and adaptation, and data on food web topology and feeding interactions help to detail the conditions for possible regime shifts. Identification of relevant processes will also benefit the coupling of different models to investigate spatial–temporal changes in stock productivity and integrated responses of social–ecological systems. Thus, a more process‐informed foundation for models will promote the integration of experimental and observational results and increase the potential for model‐based extrapolations into a future under changing environmental conditions.

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“…The estimates were from virtual population analyzes, mostly relying on fisheries catch data. Other potential predators, such as marine mammals (Bogstad et al 2015), were not explicitly modelled due to scarcer observation data, but were accounted for in a process noise term in the model.…”

Section: Cod Herring Fishingmentioning

confidence: 99%

Predator‐prey interactions cause apparent competition between marine zooplankton groups

Stige

Kvile

Bogstad

et al. 2018

Ecology

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Predator-mediated apparent competition is an indirect negative interaction between two prey species mediated by a shared predator. Quantifying such indirect ecosystem effects is methodologically challenging but important for understanding ecosystem functioning. Still, there are few examples of apparent competition from pelagic marine environments. Using state-space statistical modeling, we here provide evidence for apparent competition between two dominant zooplankton groups in a large marine ecosystem, i.e., krill and copepods in the Barents Sea. This effect is mediated by a positive association between krill biomass and survival of the main planktivorous fish in the Barents Sea, capelin Mallotus villosus, and a negative association between capelin and copepod biomasses. The biomass of Atlantic krill species is expected to increase in the Barents Sea due to ongoing climate change, thereby potentially negatively affecting copepods through apparent competition. By demonstrating and quantifying apparent competition in a large marine ecosystem, our study paves the way for more realistic projections of indirect ecosystem effects of climate change and harvesting.

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A review of the battle for food in the Barents Sea: cod vs. marine mammals

Cited by 67 publications

References 69 publications

Faster Atlantic currents drive poleward expansion of temperate phytoplankton in the Arctic Ocean

Faster Atlantic currents drive poleward expansion of temperate phytoplankton in the Arctic Ocean

Modelling climate change impacts on marine fish populations: process‐based integration of ocean warming, acidification and other environmental drivers

Predator‐prey interactions cause apparent competition between marine zooplankton groups

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