A5013931146- Marine and fisheries research
- Fish Ecology and Management Studies
- Marine Bivalve and Aquaculture Studies
- Isotope Analysis in Ecology
- Botany and Plant Ecology Studies
- Marine and coastal ecosystems
- Food Industry and Aquatic Biology
- Aquaculture Nutrition and Growth
- Oceanographic and Atmospheric Processes
- Marine and environmental studies
- Peatlands and Wetlands Ecology
- Plant Ecology and Soil Science
- Coral and Marine Ecosystems Studies
- Marine Invertebrate Physiology and Ecology
- Soil Carbon and Nitrogen Dynamics
- Reproductive biology and impacts on aquatic species
- Fish Biology and Ecology Studies
- Coastal and Marine Management
- Turfgrass Adaptation and Management
- Agriculture, Plant Science, Crop Management
- Marine Ecology and Invasive Species
- Integrated Water Resources Management
- Coastal wetland ecosystem dynamics
- Marine Biology and Ecology Research
- Ecology and biodiversity studies
Technical University of Denmark
2010-2021
Estonian University of Life Sciences
2006-2013
Danish Centre for Marine Research
2001-2009
National Marine Fisheries Research Institute
2008
Kiel University
2001-2003
Institut de Ciències del Mar
2003
GEOMAR Helmholtz Centre for Ocean Research Kiel
1999-2001
Atlantic Research Institute of Fisheries and Oceanography
2001
Universität Hamburg
2001
Kiel Institute for the World Economy
1996
Abstract Large-scale climatic conditions prevailing over the central Baltic Sea resulted in declining salinity and oxygen concentrations spawning areas of eastern cod stock. These changes hydrography reduced reproductive success and, combined with high fishing pressure, caused a decline stock to lowest level on record early 1990s. The present study aims at disentangling interactions between effort hydrographic forcing leading variable recruitment. Based identified key processes, dynamics is...
Throughout the 1980s, reproductive success of top-predator cod declined and stock sizes main prey species herring especially sprat, important planktivorous predators in system, increased substantially. Although hydrographic conditions conducive for survival early life stages improved during 1990s, recruitment remained far below average. As clupeids have been identified as major on eggs larvae Baltic, predation may be an factor hampering recovery. Results from stomach content analysis sprat...
Abstract The Baltic Sea is a large brackish semienclosed sea whose species‐poor fish community supports important commercial and recreational fisheries. Both the species fisheries are strongly affected by climate variations. These climatic effects underlying mechanisms briefly reviewed. We then use recent regional – scale ocean modelling results to consider how change during this century will affect of management. Expected changes in northern Europe likely both temperature salinity Baltic,...
Processes controlling the production of new fish (recruitment) are poorly understood and therefore challenge population ecologists resource managers. Sprat in Baltic Sea is no exception: recruitment varies widely between years virtually independent biomass mature sprat. a key prey predator species ecosystem commercially exploited (1.86 × 108 kg/yr since 1974). The fishery must be managed sustainably if necessary accommodate environmental effects on dynamics. We demonstrate using 45 data that...
A unique dataset of stomach contents sampled between 1977 and 1999 in the central Baltic Sea was used to perform a comprehensive study feeding ecology Central herring Clupea harengus sprat Sprattus sprattus . Both fish species were mainly preying upon calanoid copepods with Pseudocalanus sp. dominating diet herring, whereas generally preferred Temora longicornis Sprat preyed older copepodite stages, indicating size‐selective particulate feeding, additionally fed on smaller occasional low...
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...
There is accumulating evidence to suggest that spawning stock biomass (SSB) may not be directly proportional reproductive potential.The wide-ranging implications of this conclusion necessitate it tested for as many stocks possible.Undertaking such tests complicated by the fact fish vary in amount and type information available estimate potential.In review, nine illustrate range
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...
Abstract Oceanographic conditions in the brackish central Baltic Sea are strongly linked to atmospheric forcing and unusual period of persistently strong westerlies that, since late 1980s, have resulted an increase average water temperatures decreasing salinity. These changes temperature salinity a change dominance mesozooplankton community from Pseudocalanus sp. Temora longicornis Acartia spp. Similar copepod community, fish shifted cod (Gadus morhua), dominant during sprat (Sprattus...
A coupled hydrodynamictrophodynamic individual-based model of drift and feeding was utilized to analyze the intra- inter-annual variability in growth survival cod (Gadus morhua) larvae central Baltic Sea. Highly temporally spatially resolved simulated flow fields were used investigate potential larval from centre spawning effort Bornholm Basin towards their nursery areas through three-dimensional idealized prey fields. Stomach content analyses revealed calanoid copepod nauplii early...
Abstract The eastern Baltic cod stock has recently started to recover, after two decades of severe depletion, however with unexpected side effects. not re‐occupied its former wide distribution range, but remains concentrated in a limited area the southern Sea. biomass forage fish, i.e., sprat and herring, is historic low this area, which combination increasing results locally high predation mortality fish cannibalism cod. In line prey availability, body weight nutritional condition...
Population dynamics of major Baltic calanoid copepod species in the Gotland Basin during last two decades were characterized by a decline Pseudocalanus elongatus associated with declining salinities, and an increase Temora longicornis Acartia spp. potentially due to warmer conditions. Additionally this study investigated effect predation planktivorous fish herring (Clupea harengus) sprat (Sprattus sprattus) for period 1977–1996 (Central Sea). Examination consumption these relation production...
Abstract Pseudocalanus elongatus is a key species in the pelagic zone of deep basins Central Baltic Sea. The copepod serves as major food organism for larval well adult, planktivorous fish. Large interannual fluctuations standing stock P. have been attributed to significant changes hydrographic environment over last two decades. In particular, decreasing salinity basins, result change atmospheric forcing leading an increase rainfall since 1980s and lack pulses saline water intrusions from...
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...
Recruitment patterns of Baltic Sea sprat (Sprattus sprattus) were correlated to time series (i) month- and depth-specific temperature conditions (ii) larval drift inferred from long-term Lagrangian particle simulations. From the latter, we derived an index that likely reflected variable degree annual transport central, deep spawning basins shallow coastal areas Sea. The was significantly (P < 0.001) recruitment success explained, together with stock biomass, 82% overall variability...
Understanding how human impacts have interacted with natural variability to affect populations and ecosystems is required for sustainable management conservation. The Baltic Sea one of the few large marine worldwide where relative contribution several key forcings changes in fish can be analyzed empirical data. In this study we investigate climate multiple (fishing, mammal hunting, eutrophication) affected multi-decadal scale dynamics cod during 20th century. We document significant...
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...
Observed fluctuations in relative fecundity of Eastern Baltic cod (Gadus morhua L.) were related to food availability during the main feeding period and used develop a predictive model that explained 72% interannual variations fecundity. Time series sex ratios, maturity ogives, combined with mean weights-at-age stock sizes from an analytical multispecies estimate potential egg production (PEP). Relationships between PEP independent estimates realized daily seasonal surveys highly...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 349:303-306 (2007) - DOI: https://doi.org/10.3354/meps07283 Invading Mnemiopsis leidyi as a potential threat Baltic fish Holger Haslob1,*, Catriona Clemmesen1, Matthias Schaber1, Hans-Harald Hinrichsen1, Jörn Oliver Schmidt1, Rüdiger Voss1, Gerd Kraus2, Friedrich W. Köster2 1Leibniz Institute of Sciences,...
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,...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 303:259-267 (2005) - doi:10.3354/meps303259 Maternal and paternal influences on early life history traits processes of Baltic cod Gadus morhua Edward A. Trippel1, *, Gerd Kraus2, Friedrich W. Köster2, 3 1Fisheries Oceans Canada, St. Andrews Biological Station, 531 Brandy Cove Road, Andrews, New Brunswick E5B...