Margit Eero
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View article: Stock mixing of eastern and western Baltic cod in SD 24
Stock mixing of eastern and western Baltic cod in SD 24 Open
No abstracts are to be cited without prior reference to the author.In the Baltic Sea, two genetically distinct cod populations occur, the eastern Baltic cod inICES SDs 25-32 and the western Baltic cod in SDs 22-24. Since 2006, cod abundanc…
View article: The Eastern Baltic cod stock in the 20th century: Resolving impacts of fishing, human-induced trophic changes and climate
The Eastern Baltic cod stock in the 20th century: Resolving impacts of fishing, human-induced trophic changes and climate Open
No abstracts are to be cited without prior reference to the author.Because of long time-series of data and large contrasts in the stock size and in forcing factors, cod (Gadus morhua) in the Baltic Sea provides a unique opportunity to inve…
View article: New insights into the recent collapse of Eastern Baltic cod from historical data on stock health
New insights into the recent collapse of Eastern Baltic cod from historical data on stock health Open
The Eastern Baltic cod ( Gadus morhua ) stock is currently in a very poor state, with low biomass and adverse trends in several life history and demographic parameters. This raises concern over whether and to what level recovery is possibl…
View article: Human impacts and their interactions in the Baltic Sea region
Human impacts and their interactions in the Baltic Sea region Open
Coastal environments, in particular heavily populated semi-enclosed marginal seas and coasts like the Baltic Sea region, are strongly affected by human activities. A multitude of human impacts, including climate change, affect the differen…
View article: Reference state, structure, regime shifts, and regulatory drivers in a coastal sea over the last century: The Central Baltic Sea case
Reference state, structure, regime shifts, and regulatory drivers in a coastal sea over the last century: The Central Baltic Sea case Open
The occurrence of regime shifts in marine ecosystems has important implications for environmental legislation that requires setting reference levels and targets of quantitative restoration outcomes. The Baltic Sea ecosystem has undergone l…
View article: Comment on esd-2021-54
Comment on esd-2021-54 Open
Abstract. Coastal environments, in particular heavily populated semi-enclosed marginal seas and coasts like the Baltic Sea region, are strongly affected by human activities. A multitude of human impacts, including climate change, affect th…
View article: Use of food web knowledge in environmental conservation and management of living resources in the Baltic Sea
Use of food web knowledge in environmental conservation and management of living resources in the Baltic Sea Open
Food webs are central entities mediating processes and external pressures in marine ecosystems. They are essential to understand and predict ecosystem dynamics and provision of ecosystem services. Paradoxically, utilization of food web kno…
View article: Where do you come from, where do you go: early life stage drift and migrations of cod inferred from otolith microchemistry and genetic population assignment
Where do you come from, where do you go: early life stage drift and migrations of cod inferred from otolith microchemistry and genetic population assignment Open
This study investigates stock mixing of genetically distinct Atlantic cod (Gadus morhua) stocks in the Kattegat, an area geographically located between the North Sea and the Baltic Sea, by combining genetic population identification with h…
View article: Human impacts and their interactions in the Baltic Sea region
Human impacts and their interactions in the Baltic Sea region Open
Coastal environments, in particular heavily populated semi-enclosed marginal seas and coasts like the Baltic Sea region, are stongly affected by human activities. A multitude of human impacts, including climate change, affects the differen…
View article: Something old, something new: Historical perspectives provide lessons for blue growth agendas
Something old, something new: Historical perspectives provide lessons for blue growth agendas Open
The concept of “blue growth,” which aims to promote the growth of ocean economies while holistically managing marine socioecological systems, is emerging within national and international marine policy. The concept is often promoted as bei…
View article: KYSTFISK III. Population connectivity of cod and plaice in Danish coastal waters
KYSTFISK III. Population connectivity of cod and plaice in Danish coastal waters Open
Danish fishermen have experienced a decline in coastal fishing resources and have called for an explanation of these changes. For example, cod and plaice appear to have changed their distributions with less fish present in coastal areas. T…
View article: Sustainable management of Kattegat cod; better knowledge of stock components and migration
Sustainable management of Kattegat cod; better knowledge of stock components and migration Open
This report describes the main findings from the EMFF project “Bæredygtig forvaltning af Kattegat-torsk; bedre viden om bestandskomponenter og migration” (J. nr. 33113-B-16-034) which was initiated to improve our understanding of stock mix…
View article: REPORT ON EASTERN BALTIC COD BYCATCH IN NON-TARGETED FISHERIES, MIXING WITH WESTERN BALTIC COD IN SD24, AND STOCK SITUATION IN SDS 27-32
REPORT ON EASTERN BALTIC COD BYCATCH IN NON-TARGETED FISHERIES, MIXING WITH WESTERN BALTIC COD IN SD24, AND STOCK SITUATION IN SDS 27-32 Open
1. Bycatch of Eastern Baltic cod in non-targeted fisheries 1a.Total cod bycatch in 2018 was in the range of 360-1306 *tonnes in subdivisions 25-32 (eastern stock) and 66-417* tonnes in subdivision 24 (eastern and western stock combined). T…
View article: Eastern Baltic cod—New knowledge on growth and mortality
Eastern Baltic cod—New knowledge on growth and mortality Open
Project resumé The project “Eastern Baltic cod - new knowledge on growth and mortality is a way to improved management advice” focused on development and implementation of approaches and methods to describe growth and natural mortality of …
View article: Genetic analyses reveal complex dynamics within a marine fish management area
Genetic analyses reveal complex dynamics within a marine fish management area Open
Genetic data have great potential for improving fisheries management by identifying the fundamental management units—that is, the biological populations—and their mixing. However, so far, the number of practical cases of marine fisheries m…
View article: Testing spatial heterogeneity with stock assessment models
Testing spatial heterogeneity with stock assessment models Open
This paper describes a methodology that combines meta-population theory and stock assessment models to gain insights about spatial heterogeneity of the meta-population in an operational time frame. The methodology was tested with stochasti…
View article: Eastern Baltic cod recruitment revisited—dynamics and impacting factors
Eastern Baltic cod recruitment revisited—dynamics and impacting factors Open
The Eastern Baltic cod abundance started rapidly to increase in the mid-2000s as evidenced by analytical stock assessments, due to increased recruitment and declining fishing mortality. Since 2014, the analytical stock assessment is not av…
View article: Using alternative biological information in stock assessment: condition-corrected natural mortality of Eastern Baltic cod
Using alternative biological information in stock assessment: condition-corrected natural mortality of Eastern Baltic cod Open
The inclusion of biological and ecological aspects in the assessment of fish population status is one of the bases for an ecosystem-based fisheries management. During the past two decades the Eastern Baltic cod has experienced a drastic re…
View article: Connectivity of larval cod in the transition area between North Sea and Baltic Sea and potential implications for fisheries management
Connectivity of larval cod in the transition area between North Sea and Baltic Sea and potential implications for fisheries management Open
Connectivity of pelagic, early life stages via transport by ocean currents may affect survival chances of offspring, recruitment success, and mixing of stocks across management units. Based on drift model studies, transport patterns of par…
View article: Appendix B. Hydrographic index compared to cod reproductive volume.
Appendix B. Hydrographic index compared to cod reproductive volume. Open
Hydrographic index compared to cod reproductive volume.
View article: Appendix A. List of data sets used in the analyses and calculation of cod spawning stock biomass in 1925–1944.
Appendix A. List of data sets used in the analyses and calculation of cod spawning stock biomass in 1925–1944. Open
List of data sets used in the analyses and calculation of cod spawning stock biomass in 1925–1944.
View article: Appendix C. Cod surplus production vs. total biomass.
Appendix C. Cod surplus production vs. total biomass. Open
Cod surplus production vs. total biomass.