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Papers by Lena Bergström

Research paper thumbnail of Nandrolone decanoate administration dose-dependently affects the density of kappa opioid peptide receptors in the rat brain determined by autoradiography

Research paper thumbnail of Climate-induced synchronous regime shifts along environmental and diversity gradients in Baltic Sea sub-systems

Research paper thumbnail of Making the ecosystem approach operational—Can regime shifts in ecological- and governance systems facilitate the transition?

Marine Policy, 2010

Effectively reducing cumulative impacts on marine ecosystems requires co-evolution between scienc... more Effectively reducing cumulative impacts on marine ecosystems requires co-evolution between science, policy and practice. Here, long-term social-ecological changes in the Baltic Sea are described, illustrating how the process of making the ecosystem approach operational in a large marine ecosystem can be stimulated. The existing multi-level governance institutions are specifically set up for dealing with individual sectors, but do not adequately support an operational application of the ecosystem approach. The review of ecosystem services in relation to regime shifts and resilience of the Baltic Sea sub-basins, and their driving forces, points to a number of challenges. There is however a movement towards a new governance regime. Bottom-up pilot initiatives can lead to a diffusion of innovation within the existing governance framework. Top-down, enabling EU legislation, can help stimulating innovations and re-organizing governance structures at drainage basin level to the Baltic Sea catchment as a whole. Experimentation and innovation at local to the regional levels is critical for a transition to ecosystem-based management. Establishing science-based learning platforms at sub-basin scales could facilitate this process.

Research paper thumbnail of Towards holistic ecosystem assessments-achievements of the ICES/HELCOM Working Group on Integrated Assessments of the Baltic Sea (WGIAB)

Research paper thumbnail of A demonstration of an integrated ecosystem assessment and advice for Baltic Sea fish stocks

Research paper thumbnail of Implementing Ecosystem-Based Fisheries Management: Advances, Challenges and Emerging Tools

Research paper thumbnail of Making the ecosystem approach operational—Can regime shifts in ecological- and governance systems facilitate the transition?

Marine Policy, 2010

Effectively reducing cumulative impacts on marine ecosystems requires co-evolution between scienc... more Effectively reducing cumulative impacts on marine ecosystems requires co-evolution between science, policy and practice. Here, long-term social-ecological changes in the Baltic Sea are described, illustrating how the process of making the ecosystem approach operational in a large marine ecosystem can be stimulated. The existing multi-level governance institutions are specifically set up for dealing with individual sectors, but do not adequately support an operational application of the ecosystem approach. The review of ecosystem services in relation to regime shifts and resilience of the Baltic Sea sub-basins, and their driving forces, points to a number of challenges. There is however a movement towards a new governance regime. Bottom-up pilot initiatives can lead to a diffusion of innovation within the existing governance framework. Top-down, enabling EU legislation, can help stimulating innovations and re-organizing governance structures at drainage basin level to the Baltic Sea catchment as a whole. Experimentation and innovation at local to the regional levels is critical for a transition to ecosystem-based management. Establishing science-based learning platforms at sub-basin scales could facilitate this process.

Research paper thumbnail of Implementing Ecosystem-Based Fisheries Management: Advances, Challenges and Emerging Tools

Research paper thumbnail of A demonstration of an integrated ecosystem assessment and advice for Baltic Sea fish stocks

Research paper thumbnail of Towards holistic ecosystem assessments-achievements of the ICES/HELCOM Working Group on Integrated Assessments of the Baltic Sea (WGIAB)

Research paper thumbnail of Climate-induced synchronous regime shifts along environmental and diversity gradients in Baltic Sea sub-systems

Research paper thumbnail of Synchronous regime shifts in Baltic Sea ecosystems: Similarities and dissimilarities in response to climate, nutrients and fisheries

Synchronous regime shifts in Baltic Sea ecosystems: Similarities and dissimilarities in response ... more Synchronous regime shifts in Baltic Sea ecosystems: Similarities and dissimilarities in response to climate, nutrients and fisheries Thorsten. Blenckner1, Rabea. Diekmann2, Christian. Möllmann2, Anna. Gårdmark3, Michele. Casini4, Lena Bergström3, Juha Flinkman5, ...

Research paper thumbnail of Integrated ecosystem assessments of seven Baltic Sea areas covering the last three decades

ICES Cooperative Research Report, 2010

... EDITORS Rabea Diekmann and Christian Möllmann AUTHORS Lena Bergström ● RabeaDiekmann ● Juha F... more ... EDITORS Rabea Diekmann and Christian Möllmann AUTHORS Lena Bergström ● RabeaDiekmann ● Juha Flinkman Anna Gårdmark ● Georgs Kornilovs ● Martin Lindegren Bärbel Müller-Karulis ● Christian Möllmann ● Maris Plikshs Arno Põllumäe Page 2. ...

Research paper thumbnail of GENETIC AND MORPHOLOGICAL IDENTIFICATION OF FUCUS RADICANS SP. NOV.(FUCALES, PHAEOPHYCEAE) IN THE BRACKISH BALTIC SEA1

Brown seaweeds of the genus Fucus occupy a wide variety of temperate coastal habitats. The genus ... more Brown seaweeds of the genus Fucus occupy a wide variety of temperate coastal habitats. The genus is evolutionary dynamic with recent radiations to form morphologically distinct taxa. In the brackish Baltic Sea, fucoids are the only perennial canopy-forming macroalgae. The most northern populations of Fucus occur permanently submerged in extremely low salinity (3-5 psu). These are currently referred to as Fucus vesiculosus L. but are morphologically distinct with a narrow frond without bladders. We report here that a population of this unique morphotype is reproductively isolated from a truly sympatric population of common F. vesiculosus and conclude that the northern morphotype represents a previously undescribed species. We describe Fucus radicans sp. nov., which is attached and dioecious with broadly elliptic receptacles, characterized by a richly branched narrow flat frond (2-5 mm), short thallus (o26 cm), and a high capacity for vegetative recruitment of attached plants. Analysis of five highly polymorphic microsatellite DNA loci showed genetic differentiation between sympatric populations of F. radicans and F. vesiculosus, whereas allopatric populations of the same species revealed a coherent pattern of genetic variation. Sequences of the RUBISCO region in F. radicans were identical to or differing at only one to two dinucleotide positions from those of F. vesiculosus, indicating a recent common origin of the two species.

Research paper thumbnail of Intriguing asexual life in marginal populations of the brown seaweed Fucus vesiculosus

Using microsatellites we show evolution of asexual reproduction in the bladder wrack promoting po... more Using microsatellites we show evolution of asexual reproduction in the bladder wrack promoting population persistence in the brackish water Baltic Sea (< 6 psu). Here a dwarf morph of Fucus vesiculosus is dominated by a single clone but clonal reproduction is also present in the common form of the species. We describe a possible mechanism for vegetative reproduction of attached algae, and conclude that clonality plays an important role in persistence and dispersal of these marginal populations, in which sexual reproduction is impaired by low salinity.

Research paper thumbnail of Theme Session E: A method for assessing the ecological coherence of an MPA network with regard to fish

Research paper thumbnail of Vindkraftens effekter på marint liv

Research paper thumbnail of Nandrolone decanoate administration dose-dependently affects the density of kappa opioid peptide receptors in the rat brain determined by autoradiography

Research paper thumbnail of Climate-induced synchronous regime shifts along environmental and diversity gradients in Baltic Sea sub-systems

Research paper thumbnail of Making the ecosystem approach operational—Can regime shifts in ecological- and governance systems facilitate the transition?

Marine Policy, 2010

Effectively reducing cumulative impacts on marine ecosystems requires co-evolution between scienc... more Effectively reducing cumulative impacts on marine ecosystems requires co-evolution between science, policy and practice. Here, long-term social-ecological changes in the Baltic Sea are described, illustrating how the process of making the ecosystem approach operational in a large marine ecosystem can be stimulated. The existing multi-level governance institutions are specifically set up for dealing with individual sectors, but do not adequately support an operational application of the ecosystem approach. The review of ecosystem services in relation to regime shifts and resilience of the Baltic Sea sub-basins, and their driving forces, points to a number of challenges. There is however a movement towards a new governance regime. Bottom-up pilot initiatives can lead to a diffusion of innovation within the existing governance framework. Top-down, enabling EU legislation, can help stimulating innovations and re-organizing governance structures at drainage basin level to the Baltic Sea catchment as a whole. Experimentation and innovation at local to the regional levels is critical for a transition to ecosystem-based management. Establishing science-based learning platforms at sub-basin scales could facilitate this process.

Research paper thumbnail of Towards holistic ecosystem assessments-achievements of the ICES/HELCOM Working Group on Integrated Assessments of the Baltic Sea (WGIAB)

Research paper thumbnail of A demonstration of an integrated ecosystem assessment and advice for Baltic Sea fish stocks

Research paper thumbnail of Implementing Ecosystem-Based Fisheries Management: Advances, Challenges and Emerging Tools

Research paper thumbnail of Making the ecosystem approach operational—Can regime shifts in ecological- and governance systems facilitate the transition?

Marine Policy, 2010

Effectively reducing cumulative impacts on marine ecosystems requires co-evolution between scienc... more Effectively reducing cumulative impacts on marine ecosystems requires co-evolution between science, policy and practice. Here, long-term social-ecological changes in the Baltic Sea are described, illustrating how the process of making the ecosystem approach operational in a large marine ecosystem can be stimulated. The existing multi-level governance institutions are specifically set up for dealing with individual sectors, but do not adequately support an operational application of the ecosystem approach. The review of ecosystem services in relation to regime shifts and resilience of the Baltic Sea sub-basins, and their driving forces, points to a number of challenges. There is however a movement towards a new governance regime. Bottom-up pilot initiatives can lead to a diffusion of innovation within the existing governance framework. Top-down, enabling EU legislation, can help stimulating innovations and re-organizing governance structures at drainage basin level to the Baltic Sea catchment as a whole. Experimentation and innovation at local to the regional levels is critical for a transition to ecosystem-based management. Establishing science-based learning platforms at sub-basin scales could facilitate this process.

Research paper thumbnail of Implementing Ecosystem-Based Fisheries Management: Advances, Challenges and Emerging Tools

Research paper thumbnail of A demonstration of an integrated ecosystem assessment and advice for Baltic Sea fish stocks

Research paper thumbnail of Towards holistic ecosystem assessments-achievements of the ICES/HELCOM Working Group on Integrated Assessments of the Baltic Sea (WGIAB)

Research paper thumbnail of Climate-induced synchronous regime shifts along environmental and diversity gradients in Baltic Sea sub-systems

Research paper thumbnail of Synchronous regime shifts in Baltic Sea ecosystems: Similarities and dissimilarities in response to climate, nutrients and fisheries

Synchronous regime shifts in Baltic Sea ecosystems: Similarities and dissimilarities in response ... more Synchronous regime shifts in Baltic Sea ecosystems: Similarities and dissimilarities in response to climate, nutrients and fisheries Thorsten. Blenckner1, Rabea. Diekmann2, Christian. Möllmann2, Anna. Gårdmark3, Michele. Casini4, Lena Bergström3, Juha Flinkman5, ...

Research paper thumbnail of Integrated ecosystem assessments of seven Baltic Sea areas covering the last three decades

ICES Cooperative Research Report, 2010

... EDITORS Rabea Diekmann and Christian Möllmann AUTHORS Lena Bergström ● RabeaDiekmann ● Juha F... more ... EDITORS Rabea Diekmann and Christian Möllmann AUTHORS Lena Bergström ● RabeaDiekmann ● Juha Flinkman Anna Gårdmark ● Georgs Kornilovs ● Martin Lindegren Bärbel Müller-Karulis ● Christian Möllmann ● Maris Plikshs Arno Põllumäe Page 2. ...

Research paper thumbnail of GENETIC AND MORPHOLOGICAL IDENTIFICATION OF FUCUS RADICANS SP. NOV.(FUCALES, PHAEOPHYCEAE) IN THE BRACKISH BALTIC SEA1

Brown seaweeds of the genus Fucus occupy a wide variety of temperate coastal habitats. The genus ... more Brown seaweeds of the genus Fucus occupy a wide variety of temperate coastal habitats. The genus is evolutionary dynamic with recent radiations to form morphologically distinct taxa. In the brackish Baltic Sea, fucoids are the only perennial canopy-forming macroalgae. The most northern populations of Fucus occur permanently submerged in extremely low salinity (3-5 psu). These are currently referred to as Fucus vesiculosus L. but are morphologically distinct with a narrow frond without bladders. We report here that a population of this unique morphotype is reproductively isolated from a truly sympatric population of common F. vesiculosus and conclude that the northern morphotype represents a previously undescribed species. We describe Fucus radicans sp. nov., which is attached and dioecious with broadly elliptic receptacles, characterized by a richly branched narrow flat frond (2-5 mm), short thallus (o26 cm), and a high capacity for vegetative recruitment of attached plants. Analysis of five highly polymorphic microsatellite DNA loci showed genetic differentiation between sympatric populations of F. radicans and F. vesiculosus, whereas allopatric populations of the same species revealed a coherent pattern of genetic variation. Sequences of the RUBISCO region in F. radicans were identical to or differing at only one to two dinucleotide positions from those of F. vesiculosus, indicating a recent common origin of the two species.

Research paper thumbnail of Intriguing asexual life in marginal populations of the brown seaweed Fucus vesiculosus

Using microsatellites we show evolution of asexual reproduction in the bladder wrack promoting po... more Using microsatellites we show evolution of asexual reproduction in the bladder wrack promoting population persistence in the brackish water Baltic Sea (< 6 psu). Here a dwarf morph of Fucus vesiculosus is dominated by a single clone but clonal reproduction is also present in the common form of the species. We describe a possible mechanism for vegetative reproduction of attached algae, and conclude that clonality plays an important role in persistence and dispersal of these marginal populations, in which sexual reproduction is impaired by low salinity.

Research paper thumbnail of Theme Session E: A method for assessing the ecological coherence of an MPA network with regard to fish

Research paper thumbnail of Vindkraftens effekter på marint liv

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