A5033692021- Marine and fisheries research
- Marine Bivalve and Aquaculture Studies
- Fish Ecology and Management Studies
- Food Industry and Aquatic Biology
- Marine and coastal ecosystems
- Fish Biology and Ecology Studies
- Mathematical and Theoretical Epidemiology and Ecology Models
- Isotope Analysis in Ecology
- Antibiotic Resistance in Bacteria
- Environmental Toxicology and Ecotoxicology
- Yersinia bacterium, plague, ectoparasites research
- Oceanographic and Atmospheric Processes
- Coral and Marine Ecosystems Studies
- Toxic Organic Pollutants Impact
- Mercury impact and mitigation studies
- Antibiotic Use and Resistance
Institute of Food Safety, Animal Health and Environment “BIOR”
2012-2022
State Education Development Agency
2007-2008
GEOMAR Helmholtz Centre for Ocean Research Kiel
2001
Danish Centre for Marine Research
2001
Universität Hamburg
2001
Atlantic Research Institute of Fisheries and Oceanography
2001
Latvian Biomedical Research and Study Centre
1999
Abstract Marine ecosystems such as the Baltic Sea are currently under strong atmospheric and anthropogenic pressure. Besides natural human‐induced changes in climate, major drivers overfishing eutrophication significantly affecting ecosystem structure function. Recently, studies demonstrated existence of alternative stable states various terrestrial aquatic ecosystems. These so‐called regime shifts have been explained mainly a result multiple causes, e.g. climatic shifts, overexploitation or...
Investigating the factors regulating fish condition is crucial in ecology and management of exploited populations. The body cod ( Gadus morhua ) Baltic Sea has dramatically decreased during past two decades, with large implications for fishery relying on this resource. Here, we statistically investigated potential drivers 40 years using newly compiled fishery-independent biological data hydrological observations. We evidenced a combination different operating before after ecological regime...
Abstract The eastern Baltic (EB) cod (Gadus morhua) stock was depleted and overexploited for decades until the mid-2000s, when fishing mortality rapidly declined biomass started to increase, as shown by assessments. These positive developments were partly assigned effective management measures, EB considered one of most successful recoveries in recent times. In contrast this optimistic view, analytical assessment failed 2014, leaving present status unclear. Deteriorated quality some basic...
Understanding the effects of cross-system fluxes is fundamental in ecosystem ecology and biological conservation. Source-sink dynamics spillover processes may link adjacent ecosystems by movement organisms across system boundaries. However, temporal variability these on a whole marine structure have not yet been presented. Here we show, using 35 y multitrophic data series from Baltic Sea, that transitory top-predator cod its main distribution area produces cascading food web an semi-isolated...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 193:143-156 (2000) - doi:10.3354/meps193143 Quantifying environmental heterogeneity: habitat size necessary for successful development of cod Gadus morhua eggs in Baltic Sea B. R. MacKenzie1,*, H.-H. Hinrichsen2, M. Plikshs3, K. Wieland4, A. S. Zezera5 1Danish Institute Fisheries Research, Kavalergården 6,...
The recruitment processes of Baltic cod and sprat were analysed critical periods identified by addressing the major impact factors on individual early life history stages separately relating observed abundance data between successive stages. For cod, appeared to be dependent egg survival, with low oxygen concentration in dwelling depths predation clupeids as causes for mortality. Surviving production larval weakly correlated, whereas was significantly related year class strength. This...
We investigate whether a process-oriented approach based on the results of field, laboratory, and modelling studies can be used to develop stockenvironmentrecruitment model for Central Baltic cod (Gadus morhua). Based exploratory statistical analysis, significant variables influencing survival early life stages varying systematically among spawning sites were incorporated into stockrecruitment models, first major then combined entire Baltic. Variables identified included potential egg...
The Eastern Baltic cod abundance started rapidly to increase in the mid-2000s as evidenced by analytical stock assessments, due increased recruitment and declining fishing mortality. Since 2014, assessment is not available, leaving present status unclear casting doubts about magnitude of recent recruitment. Earlier studies identified main factors impacting on reproductive success be related loss two out three spawning areas 1980s caused lack major inflows with a concurrent reduction salinity...
Abstract Over the recent decades, International Council for Exploration of Sea (ICES) has set guidelines best practise quality control age estimation procedures. The applicability these is assessed by reviewing ageing issues eastern Baltic cod (EBC) as a case study. Since implementation an age-based assessment EBC in beginning 1970s, been hampered composition data, years to degree that no longer used. reason reading problems low visual contrast between growth zones otoliths which seems be...
Abstract Eutrophication and climate change will affect habitats of species more generally, the structure functioning ecosystems. We used a three‐dimensional, coupled hydrodynamic‐biogeochemical model to investigate potential future changes in size location marine during 21 st century large, eutrophicated brackish sea (the Baltic Sea, northern Europe). conducted scenario projections under combined impact nutrient load change. Possible eutrophication state this were also assessed through two...
The Baltic Sea comprises a heterogeneous oceanographic environment influencing the spatial and temporal potential for reproductive success of cod (Gadus morhua) sprat (Sprattus sprattus) in different spawning basins. Hence, to quantify stock recruitment dynamics, it is necessary resolve species-specific regional relation size, structure, distribution stock. Furthermore, as species fisheries interactions vary between areas, include these on an area-specific basis. Therefore,...
The decline of the Eastern Baltic cod (Gadus morhua) stock from highest to lowest levels on record throughout 1980s and early 1990s was caused by a combination recruitment failure increasing fishing pressure at declining sizes.The processes driving reproductive success are largely understood, but consequences these changes for fisheries management far less evident.This includes doubts about adequacy biological reference points presently used advise status, need their revision given that...
Abstract Long time series of reliable individual growth estimates are crucial for understanding the status a fish stock and deciding upon appropriate management. Tagging data provide valuable information about growth, especially useful when age‐based assessments compromised by age‐determination uncertainties. However, in literature there is lack studies assessing possible changes over using tagging data. Here, from experiments performed Baltic Sea between 1971 2019 were added to those...
Abstract Eero, M., Köster, F. W., Plikshs, and Thurow, 2007. Eastern Baltic cod (Gadus morhua callarias) stock dynamics: extending the analytical assessment back to mid-1940s. – ICES Journal of Marine Science, 64: 1257–1271. The status eastern has been assessed annually by since 1966. To understand better causes fluctuations evaluate human impact on relative natural variability, longer time-series than currently available are needed. achieve this, data mid-1940s were compiled extend...
The Baltic Sea comprises a heterogeneous oceanographic environment influencing the spatial and temporal potential for reproductive success of cod (Gadus morhua) sprat (Sprattus sprattus) in different spawning basins. Hence, to quantify stock recruitment dynamics, it is necessary resolve species-specific regional relation size, structure, distribution stock. Furthermore, as species fisheries interactions vary between areas, include these on an area-specific basis. Therefore,...
Background. The Gotland Basin spawning ground is one of three main areas Baltic cod, Gadus morhua Linnaeus, 1758. threshold water parameters for cod development are the salinity exceeding 11‰ and oxygen level above 2 mL· L–1. Such conditions only present when isohaline L–1 isooxygen. In such situation volume between isolines called “suitable reproduction volume”. When position reversed, layer demarcated by them below required thresholds as unsuitable...
Knowledge of the movement patterns and area utilisation commercially important fish stocks is critical to management. The Eastern Baltic cod Gadus morhua , one most ecologically in Sea, currently severely impacted Europe. During last 2 decades, this stock has experienced drastic decreases population size, distributional range, individual growth body condition, all which may have affected movements between different areas Sea. In study, we investigated seasonal by re-analysing historical...