Nicolas Dupont

• Dupont, Nicolas; Durant, Joël; Gjøsæter, Harald; Langangen, Øystein Ole Gahr & Stige, Leif Christian (2021). Effects of sea ice cover, temperature and predation on the stock dynamics of the key Arctic fish species polar cod Boreogadus saida. Marine Ecology Progress Series. ISSN 0171-8630. 677, s. 141–159. doi: 10.3354/meps13878. Vis sammendrag

  Climate change has large effects on population dynamics of fish species in high latitude ecosystems. Arctic fish stocks experience multiple pressures with changing abiotic living conditions and increased competition and predation from boreal species. However, there are many unknowns regarding how environmental change influences the dynamics of those populations. Here, we focused on the Barents Sea polar cod, a pan-Arctic zooplanktivorous key fish species physiologically and ecologically adapted to the presence of sea ice. We developed an age-resolved Bayesian state-space model of the dynamics of polar cod based on 30 yr of survey data (1986-2015). Using this model, we quantified how inter-annual changes in abundance were associated with abiotic variables (temperature and sea ice cover) and biotic variables (prey biomasses and a predation index). Using the model output, we used a hindcast scenario approach to investigate to which degree the observed variations in total population size were related to the abiotic or biotic variables. Our results showed that variation in abundance of young polar cod (ages 0 and 1) was best explained by abiotic variables while variation in the older age groups (ages 3 and 4) was best explained by predation. Hindcast scenarios showed that the abiotic variables had a more evident effect than predation on population dynamics, but none of the variables we considered could explain the drastic population decline observed in recent years. Our work shows the advantages of studying age-specific responses as a stepping stone to understand changes at the population level.

• Melle, Webjørn Raunsgård; Klevjer, Thor A.; Drinkwater, Kenneth F.; Strand, Espen; Naustvoll, Lars Johan & Wiebe, Peter H. [Vis alle 14 forfattere av denne artikkelen] (2020). Structure and functioning of four North Atlantic ecosystems - A comparative study. Deep-Sea Research Part II: Topical Studies in Oceanography. ISSN 0967-0645. 180, s. 1–13. doi: 10.1016/j.dsr2.2020.104838. Fulltekst i vitenarkiv
• Dupont, Nicolas; Durant, Joel Marcel; Langangen, Øystein; Gjøsæter, Harald & Stige, Leif Christian (2020). Sea ice, temperature, and prey effects on annual variations in mean lengths of a key Arctic fish, Boreogadus saida, in the Barents Sea. ICES Journal of Marine Science. ISSN 1054-3139. 77(5), s. 1796–1805. doi: 10.1093/icesjms/fsaa040. Fulltekst i vitenarkiv
• Klevjer, Thor A.; Melle, Webjørn Raunsgård; Knutsen, Tor; Strand, Espen; Korneliussen, Rolf & Dupont, Nicolas [Vis alle 8 forfattere av denne artikkelen] (2019). Micronekton biomass distribution, improved estimates across four north Atlantic basins. Deep-Sea Research Part II: Topical Studies in Oceanography. ISSN 0967-0645. s. 1–11. doi: 10.1016/j.dsr2.2019.104691. Fulltekst i vitenarkiv
• Dupont, Nicolas; Bagøien, Espen & Melle, Webjørn Raunsgård (2017). Inter-annual variability in spring abundance of adult Calanus finmarchicus from the overwintering population in the southeastern Norwegian Sea. Progress in Oceanography. ISSN 0079-6611. 152, s. 75–85. doi: 10.1016/j.pocean.2017.02.004.
• Dupont, Nicolas & Aksnes, Dag Lorents (2013). Centennial changes in water clarity of the Baltic Sea and the North Sea. Estuarine, Coastal and Shelf Science. ISSN 0272-7714. 131, s. 282–289. doi: 10.1016/j.ecss.2013.08.010. Fulltekst i vitenarkiv
• Urtizberea, Agurtzane; Dupont, Nicolas; Rosland, Rune & Aksnes, Dag Lorents (2013). Sensitivity of euphotic zone properties to CDOM variations in marine ecosystem models. Ecological Modelling. ISSN 0304-3800. 256, s. 16–22. doi: 10.1016/j.ecolmodel.2013.02.010. Fulltekst i vitenarkiv
• Dupont, Nicolas & Aksnes, Dag Lorents (2012). Effects of bottom depth and water clarity on the vertical distribution of Calanus spp. Journal of Plankton Research. ISSN 0142-7873. 34(3), s. 263–266. doi: 10.1093/plankt/fbr096.
• Dupont, Nicolas & Aksnes, Dag Lorents (2010). Simulation of optically conditioned retention and mass occurrences of Periphylla periphylla. Journal of Plankton Research. ISSN 0142-7873. 32(6), s. 773–783. doi: 10.1093/plankt/fbq015.
• Aksnes, Dag Lorents; Dupont, Nicolas; Staby, Arved; Fiksen, Øyvind; Kaartvedt, Stein & Aure, Jan (2009). Coastal water darkening and implications for mesopelagic regime shifts in Norwegian fjords. Marine Ecology Progress Series. ISSN 0171-8630. 387, s. 39–49. doi: 10.3354/meps08120.
• Dupont, Nicolas; Klevjer, Thor A.; Kaartvedt, Stein & Aksnes, Dag Lorents (2009). Diel vertical migration of the deep-water jellyfish Periphylla periphylla simulated as individual responses to absolute light intensity. Limnology and Oceanography. ISSN 0024-3590. 54(5), s. 1765–1775.

Se alle arbeider i Cristin

• Dupont, Nicolas (2021). Borealization of the Barents Sea : effect on the polar cod stock.
• Dupont, Nicolas (2021). Sea ice, temperature and predation influence respectively the survival of young and old polar cod in the Arctic Barents Sea.
• Dupont, Nicolas (2021). What happens with the Arctic ecosystem when the sea-ice disappears?
• Dupont, Nicolas (2021). Fishes in the Arctic: the example of polar cod.
• Dupont, Nicolas; Durant, Joël; Gjøsæter, Harald; Langangen, Øystein Ole Gahr & Stige, Leif Christian (2021). Using time series to predict the future: quantifying the effects of borealization on polar cod (Boreogadus saida).
• Dupont, Nicolas & Seuthe, Lena (2020). Polar cod have become larger in the Barents Sea over the last 30 years.
• Dupont, Nicolas (2020). Global warming makes polar cod grow larger in the Arctic Barents Sea .
• Dupont, Nicolas; Durant, Joel Marcel; Langangen, Øystein; Gjøsæter, Harald & Stige, Leif Christian (2019). Environmental effects on population annual mean length of polar cod (Boreogadus saida) in the Barents Sea .
• Dupont, Nicolas; Durant, Joel Marcel; Langangen, Øystein; Gjøsæter, Harald & Stige, Leif Christian (2019). Environmental effects on population annual mean length of polar cod (Boreogadus saida) in the Barents Sea .
• Stige, Leif Christian; Kløver, Geir Olav; Dupont, Nicolas; Borgå, Katrine; Stenseth, Nils Christian & Isachsen, Pål Erik [Vis alle 7 forfattere av denne artikkelen] (2019). Kunnskap fra isødet. Vis sammendrag

  Åpent arrangement med disse foredragene: "Kunnskapsinnhøsting i Arktis ombord i Fram 1893-1896" (Kløver); "Arven etter Nansen" (Stige); "Hva skjer med økosystemet når sjøisen forsvinner?" (Dupont); "Miljøgifter i Arktis" (Borgå); "Havstrømmene i Arktis – hvorfor er de spesielle?" (Isachsen); "En djerv polarforsker: Hanna Resvoll-Holmsen (1873-1943)" (Sandberg). Ordstyrere: Stige og Stenseth.

• Dupont, Nicolas; Stige, Leif Christian & Langangen, Øystein (2017). Effects of heterogeneous spatial mortality on recruitment of Northeast Arctic cod (Gadus morhua) in the Barents Sea.
• Durant, Joel Marcel; Langangen, Øystein & Dupont, Nicolas (2017). Barents Sea cod larvae survival and match-mismatch .
• Dupont, Nicolas; Bagøien, Espen & Melle, Webjørn Raunsgård (2016). Long-term trends and variability in spring development of Calanus finmarchicus in the southeastern Norwegian Sea during 1996-2012.
• Dupont, Nicolas; Stige, Leif Christian; Bagøien, Espen & Melle, Webjørn Raunsgård (2016). Long-term trends and seasonal patterns for Calanus finmarchicus and Calanus helgolandicus in the Coastal Water off southwest Norway during 1996-2012.
• Dupont, Nicolas (2010). Water clarity as a forcing factor of marine ecosystems. Universitetet i Bergen.

Se alle arbeider i Cristin