A5024940754- Marine and fisheries research
- Marine animal studies overview
- Fish Ecology and Management Studies
- Underwater Acoustics Research
- Marine Bivalve and Aquaculture Studies
- Food Industry and Aquatic Biology
- Arctic and Antarctic ice dynamics
- Underwater Vehicles and Communication Systems
- Isotope Analysis in Ecology
- Oceanographic and Atmospheric Processes
- Fish Biology and Ecology Studies
- Ecology and biodiversity studies
- Coral and Marine Ecosystems Studies
- Avian ecology and behavior
- Marine and environmental studies
- Marine and coastal ecosystems
- Cephalopods and Marine Biology
- Genetic diversity and population structure
- Geology and Paleoclimatology Research
- Ichthyology and Marine Biology
- Marine Biology and Ecology Research
- Indigenous Studies and Ecology
- Climate variability and models
- Genetic and phenotypic traits in livestock
- Identification and Quantification in Food
Norwegian Institute of Marine Research
2013-2024
NORCE Norwegian Research Centre
2017-2020
Metas (Norway)
2020
Chr. Michelsen Institute
2018
Massachusetts Institute of Technology
2009
Northeastern University
2009
NOAA National Marine Fisheries Service Southeast Fisheries Science Center
2009
NOAA National Marine Fisheries Service Northeast Fisheries Science Center
2009
University of Bergen
2007
Directorate of Fisheries
1988-1989
We present a new probabilistic concept of reaction norms for age and size at maturation that is applicable when observations are carried out discrete time intervals. This approach can also be used to estimate metamorphosis or other ontogenetic transitions. Such estimations critical understanding phenotypic plasticity life‐history changes in variable environments, assessing genetic the presence plasticity, calibrating size‐ age‐structured population models. show previous approaches this...
Mesoscale eddies stimulate biological production in the ocean, but knowledge of energy transfers to higher trophic levels within remains fragmented and not quantified. Increasing base is constrained by inability traditional sampling methods adequately sample processes at spatio-temporal scales which they occur. By combining satellite acoustic observations over spatial 10 s km horizontally 100 m vertically, supported hydrographical we show that anticyclonic shape distribution density marine...
Similarities in the behavior of diverse animal species that form large groups have motivated attempts to establish general principles governing group behavior. It has been difficult, however, make quantitative measurements temporal and spatial extensive wild, such as bird flocks, fish shoals, locust swarms. By quantifying formation processes vast oceanic shoals during spawning, we show (i) a rapid transition from disordered highly synchronized occurs population density reaches critical...
Abstract Arctic and Antarctic marine systems have in common high latitudes, large seasonal changes light levels, cold air sea temperatures, ice. In other ways, however, they are strikingly different, including their: age, extent, geological structure, ice stability, foodweb structure. Both regions contain very rapidly warming areas climate impacts been reported, as dramatic future projections. However, the combined effects of a changing on oceanographic processes dynamics likely to influence...
The Institute of Marine Research, Bergen, has carried out combined bottom-trawl and acoustic surveys for cod haddock in the Barents Sea Svalbard area since 1981. results have demonstrated clearly that current trawl survey methods considerably underestimate young age groups cod, partly because low gear efficiency smaller fish. This paper describes experiments with small bags to collect fish escape under trawl. Catches several different species were obtained bags. Comparison between bag...
Behavior of herring (Clupea harengus) is stimulated by two ocean-going research vessels; respectively designed with and without regard to radiated-noise-standards. Both vessels generate a reaction pattern, but, contrary expectations, the initiated silent vessel stronger more prolonged than one conventional vessel. The recommendations from scientific community on noise-reduced designs were motivated expectation minimizing bias survey results caused vessel-induced fish behavior. In conclusion,...
Abstract Assessment of open‐ocean ecosystems relies on understanding ecosystem dynamics, and development end‐to‐end models represents an approach that addresses these challenges. These incorporate the population structure dynamics marine organisms at all trophic levels. Satellite remote sensing ocean colour direct at‐sea measurements provide information lower levels models, fisheries studies top predator species. However, suffer from a lack observations for so‐called mid‐trophic levels,...
Reaction norms for age and size at maturation describe the probability of immature fish maturing a certain size. Knowledge such reaction is increasingly important, both observing understanding changes in calibrating size- age-structured population models. Estimating by logistic regression requires data on distribution fish. To permit estimation when measurements are not available, information can be reconstructed means back-projection procedure. For reconstruction, only fish, or first-time...
Present management of the north-east Arctic cod and haddock stocks is based on scientific assessments stock abundance. The assessment procedures apply acoustic bottom-trawl survey indices abundance for tuning VPA (virtual population analysis). reliability strongly dependent precision accuracy fish sampling conducted with trawls. Variation in bottom trawl catches vertical distribution from a small area were studied aim finding environmental factors explanatory importance observed variation....
Abundance estimates of Northeast Arctic cod ( Gadus morhua L.) and haddock Melanogrammus aeglefinus L) are compiled annually from combined bottom-trawl acoustic surveys. Both survey methods use data catches in the calculations. The surveys conducted Barents Sea Svalbard area with same bottom trawl, but different sweep lengths. indices calculated for both areas assuming an effective path width 25 m. In this paper results parallel trawling experiments standard sampling trawl equipped lengths...
Abstract Godø, O. R., Patel, and Pedersen, G. 2009. Diel migration swimbladder resonance of small fish: some implications for analyses multifrequency echo data. – ICES Journal Marine Science, 66: 1143–1148. Many fish with swimbladders exhibit diel vertical migrations (DVM). Ascents descents hundreds metres occur, altered volume buoyancy can result from incomplete secretion resorption gas. When acoustic observations are made near the frequency swimbladder, estimated biomass be positively...
Abstract Heino, M., Porteiro, F. Sutton, T. T., Falkenhaug, Godø, O. R., and Piatkowski, U. 2011. Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic. – ICES Journal Marine Science, 68: 377–389. Material collected summer 2004 from Mid-Atlantic Ridge between Iceland Azores with three was used to estimate relative catchabilities common fish, cephalopod, decapod, jellyfish species. is defined as ratio numbers caught two trawls, standardized towed distance....
Abstract Sustainable management of fisheries resources requires quantitative knowledge and understanding species distribution, abundance, productivity-determining processes. Conventional sampling by physical capture is inconsistent with the spatial temporal scales on which many these processes occur. In contrast, acoustic observations can be obtained from centimetres to ocean basins, seconds seasons. The concept marine ecosystem acoustics (MEA) founded basic capability detect, classify,...
Abstract In the Southern Ocean, at‐sea distributions of most predators Antarctic krill are poorly known, primarily because tracking studies have only been undertaken on a restricted set species, and then at limited number sites. For chinstrap penguins, one abundant breeding across Peninsula, we show that habitat models developed utilizing distance from colony bearing to shelf‐edge, adjusting for density Pygoscelis penguins other colonies, can be used predict, with high level confidence,...
The relationship between density of groundfish in the area swept by a trawl and catchability was explored. We studied Norwegian Canadian underwater video observations cod (Gadus morhua), haddock (Melanogrammus aeglefinis), American plaice (Hippoglossoides platessoides) mouth bottom-survey trawls found that there were qualitative differences escapement capture behaviour at various densities. Based on these observations, available data from efficiency experiments carried out both regions...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 395:137-160 (2009) - DOI: https://doi.org/10.3354/meps08266 Ocean Acoustic Waveguide Remote Sensing (OAWRS) of marine ecosystems Srinivasan Jagannathan1, Ioannis Bertsatos1, Deanelle Symonds1, Tianrun Chen1, Hadi Tavakoli Nia1, Ankita Deepak Jain1, Mark Andrews2, Zheng Gong2, Redwood Nero3,4, Lena Ngor1, Mike...