Mattias Sköld

Mattias Sköld
Swedish University of Agricultural Sciences | SLU · Department of Aquatic Resources

PhD

About

66
Publications
16,688
Reads
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1,636
Citations
Introduction
Main research intersts are: -Ecosystem effects of fisheries -Fisheries management -Conservation biology -Benthic ecology
Additional affiliations
January 2003 - present
Swedish University of Agricultural Sciences
Position
  • Researcher

Publications

Publications (66)
Article
Full-text available
Stocks of Atlantic cod (Gadus morhua) in the Baltic Sea, Kattegat and Skagerrak (N. Europe) have been strongly exploited for decades bringing them into an enduringly depleted status. Scientific cod stock related advice for targeted and mixed fisheries is provided on an annual basis by the International Council for Exploration of the Sea. This advic...
Technical Report
Full-text available
The Working Group on Fisheries Benthic Impact and Trade-offs (WGFBIT) develops methods and performs assessments to evaluate benthic impact from fisheries at regional scale, while con- sidering fisheries and seabed impact trade-offs. In this report, new fishery benthic impact assessments are carried out for several sub-regions in the Mediterranean (...
Technical Report
Full-text available
The purpose of this report is to describe the current state of knowledge of the most important factors influencing fish in Swedish marine waters in preparation for the update of the program of measures in 2021 within the Swedish implementation of the Marine Strategy Framework Directive (MSFD). The objective of the MSFD is to achieve or maintain goo...
Article
Full-text available
Bottom trawling is known to affect benthic faunal communities but its effects on sediment suspension and seabed biogeochemistry are less well described. In addition, few studies have been carried out in the Baltic Sea, despite decades of trawling in this unique brackish environment and the frequent occurrence of trawling in areas where hypoxia and...
Article
Full-text available
Marine Protected Areas (MPAs) are an important tool for management and conservation and play an increasingly recognised role in societal and human well-being. However, the assessment of MPAs often lacks a simultaneous consideration of ecological and socio-economic outcomes, and this can lead to misconceptions on the effectiveness of MPAs. In this p...
Article
Full-text available
Seabirds redistribute nutrients between different ecosystem compartments and over vast geographical areas. This nutrient transfer may impact both local ecosystems on seabird breeding islands and regional biogeochemical cycling, but these processes are seldom considered in local conservation plans or biogeochemical models. The island of Stora Karlsö...
Article
Small-scale fishing communities are expected to adapt to fish catch fluctuations linked to global environmental change. Notwithstanding, impacts from severe climate events and overexploitation of fisheries resources can compromise functions and resilience of ecosystems and associated species, and thereby jeopardize long-term population trend stabil...
Article
Fisheries using bottom trawls are the most widespread source of anthropogenic physical disturbance to seafloor habitats. To mitigate such disturbances, the development of fisheries-, conservation-, and ecosystem-based management strategies requires the assessment of the impact of bottom trawling on the state of benthic biota. We explore a quantitat...
Article
Bottom trawling disturbance and hypoxia are affecting marine benthic habitats worldwide. We present an approach to predict their effects on benthic communities, and use the approach to estimate the state, the biomass relative to carrying capacity, of the Baltic Sea at the local, habitat, and regional scale. Responses to both pressures are expected...
Article
Full-text available
Particles of all origins (biogenic, lithogenic, as well as anthropogenic) are fundamental components of the coastal ocean and are re-distributed by a wide variety of transport processes at both horizontal and vertical scales. Suspended particles can act as vehicles, as well as carbon and nutrient sources, for microorganisms and zooplankton before e...
Article
Full-text available
Bottom trawls suspend sediments by physical contact and the drag created by the gear when towed over the seafloor. Increased turbidity and redistribution of sediments may be of concern as some organisms are vulnerable to increased levels of sediment particles in the water column. This study investigates the distribution and fate of trawling-induced...
Article
Full-text available
Bottom trawling can change food availability for benthivorous demersal species by (i) changing benthic prey composition through physical seabed impacts and (ii) by removing overall benthic consumer biomass increasing the net availability of benthic prey for remaining individuals. Thus trawling may both negatively and positively influence the quanti...
Article
Impact studies of chronic bottom trawling aiming to reveal long-term effects on benthic organisms are often hampered by the lack of comparable untrawled conditions and the difficulty in assessing the spatial distribution of trawling intensity. We sampled soft-seafloor macrofauna over a precise trawling gradient in the Kattegat using hourly vessel m...
Technical Report
Full-text available
This report describes the ecological effects of fishing closures (no-take areas) in Swedish marine and coastal waters. In 2005 the Swedish Board of Fisheries (now the Swedish Agency for Marine and Water Management) was commissioned by the government to establish a number of areas where all fishing was prohibited and to evaluate the effects of these...
Article
The European Common Fisheries Policy has in its 2013 reform increased in complexity, such as a call for coherence with the Marine Strategy Framework Directive and a landing obligation, posing new requirements and challenges to managers, scientists and the fishing industry. Therefore, re-evaluations of current practice are important as a basis for m...
Technical Report
Full-text available
Background levels of suspended matter in the Koster-Väderöfjord vary. The amount of suspended material is increased during days of trawling. The increase in suspended matter can in trawled water bodies become so high that dur-ing short periods of time it reaches levels negative for some organisms. Re-suspension of material due to trawling can...
Article
1.Bottom-trawl fisheries are wide-spread and cause mortality of benthic invertebrates, which in turn may lead to a decrease in the availability of prey for target fish species. Exploitation also reduces the abundance of the fish species themselves. Modelling studies have shown that bottom trawling could lead to both increases and decreases in fish...
Article
Full-text available
Background In marine fish species, where pelagic egg and larvae drift with ocean currents, population structure has been suggested to be maintained by larval retention due to hydrographic structuring and by homing of adult fish to natal areas. Whilst natal homing of adults has been demonstrated for anadromous and coral reef fishes, there are few do...
Article
This study assesses the seabed pressure of towed fishing gears and models the physical impact (area and depth of seabed penetration) from trip-based information of vessel size, gear type, and catch. Traditionally fishing pressures are calculated top-down by making use of large-scale statistics such as logbook data. Here, we take a different approac...
Article
Purpose Overfishing is a relevant issue to include in all life cycle assessments (LCAs) involving wild caught fish, as overfishing of fish stocks clearly targets the LCA safeguard objects of natural resources and natural ecosystems. Yet no robust method for assessing overfishing has been available. We propose lost potential yield (LPY) as a midpoin...
Article
Full-text available
When spatial fishing data is fed into systematic conservation planning processes the cost to a fishery could be ensured to be minimal in the zoning of marine protected areas. We used vessel monitoring system (VMS) data to map the distribution of prawn trawling and calculate fishing intensity for 1-ha grid cells, in the Kosterhavet National Park (Sw...
Article
Full-text available
We have analyzed health and physiological aging parameters in male and female Atlantic cod, Gadus morhua, captured in Kattegat, Skagerrak and in Öresund. Gender differences were clearly evident in a number of variables. Males had longer liver telomeres and higher catalase activities than females, while females had higher superoxide dismutase activi...
Article
Sediments are sinks for contaminants in the world's oceans. At the same time, commercial bottom trawling is estimated to affect around 15 million km(2) of the world's seafloor every year. However, few studies have investigated whether this disturbance remobilises sediment-associated contaminants and, if so, whether these are bioavailable to aquatic...
Article
The European Marine Strategy Framework Directive (MSFD) requires European states to maintain their marine waters in ‘Good Environmental Status’. The MSFD includes 11 descriptors of “Good Environmental Status” (GES), including “Sea-floor Integrity”. This descriptor is defined as: “Sea-floor integrity is at a level that ensures that the structure and...
Article
Full-text available
This report evaluates effects of increased spatial protection from fishery on the Swedish west-coast on coastal fish stocks, benthic fauna and exploitation patterns in the fishery for Norway lobster (Nephrops norvegicus ). The aims of the measures along the coast were to reverse the negative development of the local demersal fish stocks, increase t...
Article
Full-text available
Rice, J., C. Arvanitidis, A. Borja, C. Frid, J. Hiddink, J. Krause, P. Lorance, S. A. Ragnarsson, M. Skold, B. Trabucco, 2010. Marine Strategy Framework Directive – Task Group 6 Report Seafloor integrity. EUR 24334 EN – Joint Research Centre, Luxembourg: Office for Official Publications of the European Communities: 73 pp.
Article
Increased knowledge on the spatial distribution of marine resources is crucial for the implementation of a true ecosystem approach to management and the conservation of marine organisms. For exploited fish species characterized by aggregation behaviour during spawning time, the identification and tracking of spawning areas is essential for a correc...
Chapter
Full-text available
While sexual reproduction is conserved and almost ubiquitous, asexual reproduction in forms of parthenogenesis or agametic cloning from somatic tissue is less conserved. The phylogeny shows that agametic cloning is widespread but scattered with many different modes for asexual formation of a new animal. This suggests that independent forms of cloni...
Article
Full-text available
Pedersen, S. A., Fock, H., Krause, J., Pusch, C., Sell, A. L., Böttcher, U., Rogers, S. I., Sköld, M., Skov, H., Podolska, M., Piet, G. J., and Rice, J. C. 2009. Natura 2000 sites and fisheries in German offshore waters.–ICES Journal of Marine Science, 66: 155–169. The principal objective of sites selected as part of Natura 2000 is to achieve or ma...
Article
Full-text available
We used allozymes to investigate the population genetics of the sea star Coscinasterias muricata throughout New Zealand, with emphasis on populations inhabiting the fjords on the west coast of the South Island. Mean genetic variability measured by Wright's F-st for all the New Zealand populations was 0.061, indicating a moderate level of genetic di...
Article
Full-text available
Populations of the fissiparous seastar Coscinasterias muricata were surveyed around New Zealand to determine the frequency of asexual reproduction, Seastars from an intertidal population from the Maori Bay (North Island) and 2 shallow subtidal-intertidal sites in Otago Harbour on the east coast of the South Island had split, were asymmetrical, had...
Article
Full-text available
The post-larval growth pattern and dynamics of Amphiura filiformis (Echinodermata: Ophiuroidea) were investigated in 1991 at the sill of the Gullmarsfjord. A total of 201 specimens were examined in detail by video-techniques to analyse the growth patterns of disks, arms and arm segments. Maximum settling was recorded in October, with 7,100±7,400 (m...
Article
 Arm damage is a widely reported but superficially investigated aspect of the biology of the starfish Asterias rubens L. In the present study, the incidence of arm damage was surveyed in populations of A.  rubens at two sites in the Firth of Clyde, Scotland, and three sites in Gullmarsfjorden, Sweden. The mean (±SD) incidence across all sites of in...
Article
Full-text available
Polychlorinated biphenyl (PCB) accumulation by the 2 brittle stars Amphiura filiformis and A. chiajei was studied in a laboratory experiment and in the field. In the laboratory study, the fate of C-14-2,2',4,4'-tetrachlorobiphenyl (TCB) was determined in benthic microcosms, with and without the addition of phytoplankton (Phaeodactylum tricornutum)....
Article
Full-text available
Escape reactions to simulated sub-lethal prédation were investigated in field and laboratory experiments in four epibenthic brittle stars, Ophiura albida (Forbes), Ophiura ophiura (L.), Ophiothrix fragilis (Abildgaard) and Ophiocomina nigra (Abildgaard) from the Swedish West Coast. Predation attacks were simulated in three ways: by (1) momentarily...
Article
Amphiura chiajei and Brissopsis lyrifera typically co-occur on some soft bottom areas of the North Sea, the Skagerrak and the Kattegat; they form the so called ‘Brissopsis-chiajei association’. Both species are deposit feeders that live partly ( A. chiajei) or completely ( B. lyrifera) burried in the sediment. In this association, each species is e...
Article
Effects of organic enrichment, oxygen availability and the presence of contaminants on three sediment-dwelling invertebrates, the polychaete Nereis (Hediste) diversicolor, the bivalve Abra alba and the brittle star Amphiura filiformis, were assessed using growth, arm regeneration and biomarkers (metallothionein-like proteins, glutathione reductase,...
Article
In marine environments influenced by human activities, the sea-bed is a major recipient of both contaminants and organic matter. Deposition and recycling of contaminants from bottom sediments may be affected by the eutrophication status of the area. Contaminants and eutrophication factors may also interact to affect bioaccumulation as well as the g...
Article
A major environmental issue is to understand how eutrophication processes, such as organic enrichment and hypoxia may act on the distribution patterns and bioavailability of contaminants to benthic organisms. An experiment with sediment organic C content (control vs enriched with concentrated phytoplankton) and oxygen level (normoxia vs 2–3 mg O2 l...
Article
Full-text available
The effects of a short-term organic enrichment on growth of the 2 brittle stars Amphiura filiformis (O. F. Muller) and Amphiura chiajei (Forbes) were studied in undisturbed sediment cores obtained from a coastal and an offshore site of the Kattegat and Skagerrak, and then maintained in the laboratory as microcosms. Growth was measured as arm regene...
Article
Arm regeneration and spawning in the brittle star Amphiura filiformis were studied in normoxic oxygen concentration > 8.5 mg O2l−1 (control) and in two levels of hypoxic oxygen concentrations (treatments), 2.7 mg O2l−1 and 1.8 mgO2l−1 (29 and 19% oxygen saturation) in ‘undisturbed’ sediments. The treatments were chosen to simulate short term hypoxi...
Article
Full-text available
Experimental studies in a laboratory flume show that the sediment-living brittle-star Amphiura filiformis captures suspended particles. Feeding activity is a function of now velocity with few animals extending feeding arms in still water. Flow velocity also affects the orientation of feeding arms, and we suggest that this orientation is partly cont...
Article
Eight ophiuroid species, six from the northern Kattegat-eastern Skagerrak and three from the northern Adriatic Sea, were examined for regeneration of arms. The species were separated into groups based upon mode of feeding and habitat. Comparison between groups collected in the northern Kattegat-eastern Skagerrak showed that infaunal suspension- and...
Article
Full-text available
Secondary production and population dynamics of the brittle star Amphiura filiformis (O. F. Muller) were studied between June 1990 and November 1991 at 40 m depth in the Skagerrak, west Sweden. Mean abundance of individuals > 1. mm in disc diameter was stable around 280 ind. m(-2) After a spawning maximum in June and July, settling post-larvae (ca...

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Projects

Projects (4)
Project
The project is looking at ways to assess impacts of multiple cumulative stressors on coastal/marine ecosystems in Swedish waters, in line with the EU Marine Strategy Framework Directive descriptor 6 'seafloor integrity'. I am co-leader of the work package on physical disturbance. My main involvement is with an analysis of field data describing benthic ecosystem structure and function, including ecological traits, along gradients of trawl disturbance in four areas around the Swedish coast.
Project
This project uses field measurements and experiments to investigate how bottom trawling in the Baltic Sea affects the seabed, water quality and nutrient and contaminant fluxes. Implications of and for protected areas (areas seasonally closed to fishing) will be evaluated.