Mikael van DeursTechnical University of Denmark | DTU · Aq
Mikael van Deurs
About
57
Publications
15,755
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,032
Citations
Citations since 2017
Introduction
Skills and Expertise
Publications
Publications (57)
The main objective of the workshop was to review the recommendations of WKREF1 and consider
how these might feed into a new reference points framework and guidelines for ICES.
There were a number of presentations on the wider issues of best practice for reference points,
the Allee effect, density dependence and the WKIRISH approach. The starting po...
The correct prediction of the shape and strength of density dependence in productivity is key to predicting future stock development and providing the best possible long‐term fisheries management advice. Here, we identify unbiased estimators of the relationship between somatic growth, recruitment and density, and apply these to 80 stocks in the Nor...
Many marine fish species are widely distributed over large areas. Failing to acknowledge that such species may be composed of distinct populations may result in overestimation of the stock's true harvest potential. To avoid overexploitation, ways to identify population structuring are therefore needed. In this study, we developed and applied a stat...
Native to the Ponto-Caspian region, the benthic round goby (Neogobius melanostomus) has invaded several European inland waterbodies as well as the North American Great Lakes and the Baltic Sea. The species is capable of reaching very high densities in the invaded ecosystems, with not only evidence for significant food-web effects on the native biot...
In ecological sciences, animal diets are often simplified to ‘resources' or ‘caloric quantities'. However, in the present study, we investigated the optimal foraging strategy of Atlantic cod Gadus morhua when both macro- and micro-nutritional requirements are accounted for. Proteins cannot be synthesized from fatty acids, so the proteins for gonad...
• Warming of the oceans and shifts in the timing of annual key events are likely to cause behavioral changes in species showing a high degree of site fidelity. While this is well studied in terrestrial systems, there are fewer examples from the marine environment. Sandeel (Ammodytes marinus) is a small eel-shaped teleost fish with strong behavioral...
The round goby ( Neogobius melanostomus ) was first observed in the Baltic Sea in 1990 and has since displayed substantial secondary dispersal, establishing numerous dense populations where they may outcompete native fish and negatively impact prey species. There have been multiple round goby diet studies from both the Baltic Sea and the North Amer...
Non-indigenous animals can impact native fauna via predation and competition for food and habitat. The round goby (Neogobius melanostomus) was first observed in the Baltic Sea in 1990 and has since displayed substantial secondary dispersal, establishing numerous dense populations where they may outcompete native fish and negatively impact prey spec...
Climate effects on marine fish depend on life stage, particularly when life stages differ in habitat utilization. In the present study, we investigated life stage-dependent responses of lesser sandeel (Ammodytes marinus) to temperature at contrasting geographical scales. We related population density and individual growth to temperature and found d...
Invasive species exert negative impacts on biodiversity and ecosystems on a global scale, which may be enhanced in the future by climate change. Knowledge of how invasive species respond physiologically and behaviorally to novel and changing environments can improve our understanding of which traits enable the ecological success of these species, a...
This study examines the impact of boldness on foraging competition of the highly invasive round goby Neogobius melanostomus Pallas 1815. Individual risk tolerance, or boldness, was measured as the time to resume movement after a simulated predation strike. Fish that resumed movement faster were categorized as “bold”, fish that took more time to res...
Growth is a fundamental physiological process influencing the state and dynamics of fish stocks, yet the physical and biological conditions affecting individual weight and growth throughout ontogeny are poorly known and often unaccounted for in fisheries management. This is rather surprising given that changes in growth have strong direct effects o...
Biomass limit reference points are widely used in fisheries management and define the biomass threshold (BT) below which stock productivity (i.e. recruitment) is likely to be impaired. Scientifically sound and transparent methods for estimating BTs are therefore needed together with ways of quantifying uncertainties. The main focus of the study was...
HERRING ASSESSMENT WORKING GROUP FOR THE AREA SOUTH OF 62° N
Sandeels are an ecologically important group of fishes; they are a key part of the food chain serving as food for marine mammals, seabirds and fish. Sandeels are further targeted by a large industrial fishery, which has led to concern about ecosystem effects. In the North Sea, the lesser sandeel Ammodytes marinus is by far the most prevalent specie...
Vertical migration is the most widespread migration in the aquatic world, yet the
mechanisms limiting the extent of this behavior are largely unknown. In the Baltic Sea, some
Atlantic cod Gadus morhua perform vertical foraging migrations into severely hypoxic demersal
zones where aerobic metabolism is insufficient to cover energy requirements. Afte...
Differences between individuals in behavioral type (i.e. animal personality) are ecologically and evolutionarily important because they can have significant effects on fitness components such as growth and predation risk. In the present study we ere used the invasive round goby (Neogobius melanostomus) from an established population in controlled e...
The round goby (Neogobius melanostomus; Pallas, 1814) is one of the most widespread invasive fish species. It originates from the Black Sea and the Sea of Azov but has unintentionally been introduced to fresh and brackish water bodies on both sides of the Atlantic. Small-scale fishermen catch large amounts of the invasive round goby as the species...
Herring Assessment Working Group for the Area South of 62° N (HAWG)
Aggregations of site-attached populations can show marked differences in density due to variation in local productivity and mortality processes. Matching management actions to the scale of biological processes is therefore important for sustainable fisheries management. This study examined the adequacy and appropriate scale of a spatially explicit...
In just two decades, round goby Neogobius melanostomus (Pallas) has dispersed throughout most of the Baltic and the North American Great Lakes. It thrives in shallow sheltered areas, where it is impacting native fauna. In Denmark, researchers, governmental institutions and fishers have joined in an effort to establish a sustainable round goby fishe...
The search for environmental descriptors of fish stock production is ongoing. Although numerous correlations between environmental variables such as food abundance or sea surface temperature have been proposed in the past, few are operational in a fisheries management context today. Reasons for this may include many—but spurious—correlations, the u...
Forage fish occupy a central position in marine food-webs worldwide by mediating the transfer of energy and organic matter from lower to higher trophic levels. The lesser sandeel (Ammodytes marinus) is one of the ecologically and economically most important forage fish species in the North-east Atlantic, acting as a key prey for predatory fish and...
Forage fish populations support large scale fisheries and are key components of marine ecosystems across the world, linking secondary production to higher trophic levels. While climate-induced changes in the North Sea zooplankton community are described and documented in literature, the associated bottom-up effects and consequences for fisheries re...
Passive integrated transponder (PIT) tags are commonly used to assess fish movement for use in fisheries management. Here, we investigated physiological and behavioral effects of tagging on sandeels (Ammodytes tobianus) using PIT tags constituting 2.1 ± 0.9% of their body weight. Swimming stamina (RSS), calculated as time spent swimming against the...
![Fig 1. Occurrence of round goby (red dots, from Azour et al. [48]) in...](profile/Jane-Behrens/publication/316280656/figure/fig1/AS:485301970837506@1492716414639/Occurrence-of-round-goby-red-dots-from-Azour-et-al-48-in-the-Baltic-Sea-North-Sea_Q320.jpg)
Non-indigenous species (NIS) can impact marine biodiversity and ecosystem structure and function. Once introduced into a new region, secondary dispersal is limited by the physiology of the organism in relation to the ambient environment and by complex interactions between a suite of ecological factors such as presence of predators, competitors, and...
Data on oxygen uptake and blood plasma osmolality.
All individual values of standard metabolic rate (SMR), maximum metabolic rate (MMR) and aerobic scope (AS), in addition to blood plasma osmolality and osmotic gradient, are shown in relation to ambient (treatment) salinity.
(PDF)
Accelerometer technology was used to evaluate behaviours in the teleost ambush predator pike Esox lucius foraging on crucian carp Carassius carassius. Automated rule-based estimates of prey-size determined handling time were obtained and are compared with video-recorded behaviours. Solutions to tag attachment and the limitations imposed by battery-...
Appendix 1. Average values for all the 32 different FA methyl esters extracted from the lipid extracts.
Accumulating research argues that migrants influence the functioning and productivity of local habitats and ecosystems along migration routes and potentially drive cross-system energy fluxes of considerable magnitude, yet empirical documentation of local ecological effects and descriptions of the underlying mechanisms are surprisingly rare. In this...
The Myfish project aimed to provide science on the challenges of Maximum Sustainable Yield (MSY) management that was both high level and highly relevant to the managers, industry representatives, NGOs and scientists who would make use of it. To ensure this, the project was designed to be inclusive all the way from the proposal writing phase to the...
Round goby Neogobius melanostomus is currently one of the most wide-ranging
invasive fish species in Europe and North America. The present study demonstrates how the distribution
of round goby has expanded from 2008 to 2013 at a rate of about 30 km yr−1 along the
Danish coastline in the western Baltic Sea. Further analyses showed that fish from an...
Long-term effects of the Horns Rev 1 offshore wind farm (OWF) on fish abundance,
diversity and spatial distribution were studied. This OWF is situated on the Horns Reef sand bank
in the North Sea. Surveys were conducted in September 2001, before the OWF was established in
2002, and again in September 2009, 7 yr post-establishment. The sampling surv...
In productive marine off-shore ecosystems, the flow of energy from zooplankton to large predators is channeled through a few species of short-lived, highly abundant schooling planktivorous fish. There are indications that these species respond to qualitative and phenological changes in the zooplankton. If so, the climate-induced alterations of the...
We report an unexpected observation of lesser sandeel Ammodytes marinus foraging on juveniles and late larval stages of the same species. This recording sheds new light on the cannibalistic and piscivorous capacity of forage fish and raises a number of questions about the role of forage fish in marine food webs. In 2012 and 2013, the stomachs of 74...
van Deurs, M., Koski, M., and Rindorf, A. Does copepod size determine food consumption of particulate feeding fish? – ICES Journal of Marine Science, 71: .
The climate-induced reduction in the mean copepod size, mainly driven by a decrease in the abundance of the large Calanus finmarchicus around 1987, has been linked to the low survival of fish la...
Atlantic cod Gadus morhua experienced oxygen deficit ( D O 2 ) when exposed to oxygen levels below their critical level (c. 73% of pcrit ) and subsequent excess post-hypoxic oxygen consumption (CEPHO ) upon return to normoxic conditions, indicative of an oxygen debt. The mean ± s.e. CEPHO : D O 2 was 6·9 ± 1·5, suggesting that resorting to anaerobi...
Sandeels display strong site fidelity and spend most of their life buried in the seabed. This strategy carries important ecological implications. Sandeels save energy when they are not foraging, but in return are unable to move substantially and may therefore be sensitive to local depletion of prey. We studied zooplankton consumption and energy con...
Engelhard, G. H., Peck, M. A., Rindorf, A., Smout, S. C., van Deurs, M., Raab, K., Andersen, K. H., Garthe, S., Lauerburg, R. A. M., Scott, F., Brunel, T., Aarts, G., van Kooten, T., and Dickey-Collas, M. Forage fish, their fisheries, and their predators: who drives whom? – ICES Journal of Marine Science, 71: .
The North Sea has a diverse forage fi...
Dickey-Collas, M., Engelhard, G. H., Rindorf, A., Raab, K., Smout, S., Aarts, G., van Deurs, M., Brunel, T., Hoff, A., Lauerburg R. A. M., Garthe, S., Haste Andersen, K., Scott, F., van Kooten, T., Beare, D., and Peck, M. A. Ecosystem-based management objectives for the North Sea: riding the forage fish rollercoaster. – ICES Journal of Marine Scien...
Recent recruitment failure of lesser sandeel Ammodytes marinus, a key prey fish in the North Sea, followed by several years of low spawning stock biomass, prompted us to investigate factors influencing the recruitment of this species. We tested 2 hypotheses that relate to ecological mechanisms of recruitment regulation in lesser sandeel: (1) a posi...
Offshore wind farms (OWFs) are being constructed at a high rate due to a high demand, both economically and politically, for sources of renewable energy. We investigated the short-term and long-term effects of an OWF situated in the North Sea off western Denmark (Horn Rev I; global position: 7.84 degrees E, 55.48 degrees N) on 3 ecologically import...
Disentangling physical–biological interaction processes during early life-stages of fish is crucial for the understanding of fish stock recruitment. Among many individual and environmental aspects affecting mortality during the early life-stages of fish, encountering food at greater than average concentrations is regarded important for survival. In...
Several ecologically and commercially important fish species spend the winter in a state of minimum feeding activity and at lower risk of predation. To enable this overwintering behaviour, energetic reserves are generated prior to winter to support winter metabolism. Maintenance metabolism in fish scales with body size and increases with temperatur...
The commercially and ecologically valuable sandeel (Ammodytes ssp.) make distinct vertical shifts between an inactive stage,
during which they seek refuge in the sand, and a pelagic schooling stage, during which they forage. This characteristic discontinuous
foraging pattern constitutes a challenge to fishery biologists and has consequences for a w...
The overwintering strategy is widespread among planktivorous fish from temperate to sub-polar regions, and is particularly pronounced in sandeel ecotypes. This adaptation is presumably a behavioural adaptation to strong seasonal fluctuation in prey availability, day length and temperature. Yet so far, insight into the evolutionary and ecological me...
Background. Recent research showed a particularly pronounced genetic diversity for the Atlantic herring, Clupea harengus, living in the transition zone from the Baltic Sea to the North Sea. Conserving genetic diversity is of high priority in fishery management. This requires, firstly, that we recognize life histories, not only of the major spawning...
Projects
Projects (2)
The GOFORIT project will use climatic and oceanographic process knowledge with the goal to improve short-term fishery forecasts.
GOFORIT investigates four economically important fish species from the North and South of Europe: North Sea sandeel, Icelandic capelin, Black Sea anchovy and Black Sea sprat. These species all can be classified as short lived fish species.
Fisheries for short lived species are highly variable because they primarily target a low number of age groups within stocks as well as irregularly recruiting year-classes. As a result, environmental fluctuations (e.g., temperature, food abundance), which cause major changes in fish productivity, can lead to rapid fluctuations in fishing opportunities and stock declines if fishing effort is not reduced accordingly. Such fluctuations are not foreseen or accommodated by management advisory frameworks for short-lived species, which generally assume environmental stability and constant productivity.
GOFORIT runs from April 2015 to April 2018. More information is available at http://www.goforit-cofasp.net/.
The main aim of the project is to explore and develop alternative solutions for managing stocks of sandeel (Ammodytes marinus) in the North Sea.