The Experts below are selected from a list of 9438 Experts worldwide ranked by ideXlab platform
Ulf Bergström - One of the best experts on this subject based on the ideXlab platform.
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Predicting the effects of eutrophication mitigation on Predatory Fish biomass and the value of recreational Fisheries
Ambio, 2019Co-Authors: Goran Sundblad, Lena Bergström, Tore Söderqvist, Ulf BergströmAbstract:Improving water clarity is a core objective for eutrophication management in the Baltic Sea, but may influence Fisheries via effects on Fish habitat suitability. We apply an ensemble of species distribution models coupled with habitat productivity functions and willingness-to-pay estimates to assess these effects for two coastal Predatory Fish species, European perch ( Perca fluviatilis ) and pikeperch ( Sander lucioperca ). The models predicted a 37% increase in perch and 59% decrease in pikeperch biomass if reaching the reference level for water clarity in the Baltic Sea Action Plan. Reaching the target level was predicted to increase perch biomass by 13%. However, the associated economic gain for the recreational Fisheries sector was countervailed by an 18% pikeperch reduction. Still, a net benefit was predicted since there are six times more Fishing days for perch than pikeperch. We exemplify how ecological modelling can be combined with economic analyses to map and evaluate management alternatives.
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The first large-scale assessment of three-spined stickleback (Gasterosteus aculeatus) biomass and spatial distribution in the Baltic Sea
ICES Journal of Marine Science, 2019Co-Authors: Jens Olsson, Egle Jakubaviciute, Olavi Kaljuste, Niklas Larsson, Ulf Bergström, Michele Casini, Massimiliano Cardinale, Joakim Hjelm, Pär ByströmAbstract:Declines in Predatory Fish in combination with the impact of climate change and eutrophication have caused planktivores, including three-spined stickleback (Gasterosteus aculeatus), to increase dra ...
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Stickleback increase in the Baltic Sea : A thorny issue for coastal Predatory Fish
Estuarine Coastal and Shelf Science, 2015Co-Authors: Ulf Bergström, Jens Olsson, Michele Casini, Britas Klemens Eriksson, Ronny Fredriksson, Håkan Wennhage, Magnus AppelbergAbstract:In the Baltic Sea, the mesopredator three-spined stickleback (Gasterosteus aculeatus) spends a large part of its life cycle in the open sea, but reproduces in shallow coastal habitats. In coastal waters, it may occur in high abundances, is a potent predator on eggs and larvae of Fish, and has been shown to induce trophic cascades with resulting eutrophication symptoms through regulation of invertebrate grazers. Despite its potential significance for the coastal food web, little is known about its life history and population ecology. This paper provides a description of life history traits, migration patterns and spatiotemporal development of the species in the Baltic Sea during the past decades, and tests the hypothesis that stickleback may have a negative impact on populations of coastal Predatory Fish. Offshore and coastal data during the last 30 years show that stickleback has increased fourfold in the Bothnian Sea, 45-fold in the Central Baltic Sea and sevenfold in the Southern Baltic Sea. The abundances are similar in the two northern basins, and two orders of magnitude lower in the Southern Baltic Sea. The coastward spawning migration of sticklebacks from offshore areas peaks in early May, with most spawners being two years of age at a mean length of 65 mm. The early juvenile stage is spent at the coast, whereafter sticklebacks perform a seaward feeding migration in early autumn at a size of around 35 mm. A negative spatial relation between the abundance of stickleback and early life stages of perch and pike at coastal spawning areas was observed in spatial survey data, indicating strong interactions between the species. A negative temporal relationship was observed also between adult perch and stickleback in coastal Fish monitoring programmes supporting the hypothesis that stickleback may have negative population level effects on coastal Fish predators. The recent increase in stickleback populations in different basins of the Baltic Sea in combination with negative spatiotemporal patterns and previously observed interactions between stickleback and coastal Predatory Fish suggests that this species may have gained a key role in the coastal food webs of the Baltic Sea. Through its migrations, stickleback may also constitute an important vector linking coastal and open sea ecosystem dynamics. (c) 2015 Elsevier Ltd. All rights reserved.
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recruitment failure of coastal Predatory Fish in the baltic sea coincident with an offshore ecosystem regime shift
Ices Journal of Marine Science, 2010Co-Authors: Lars Ljunggren, Olavi Kaljuste, Ulf Bergström, Michele Casini, Alfred Sandström, Gustav Johansson, Johanna Mattila, Antti Lappalainen, Goran Sundblad, Britas Klemens ErikssonAbstract:Ljunggren, L., Sandstrom, A., Bergstrom, U., Mattila, J., Lappalainen, A., Johansson, G., Sundblad, G., Casini, M., Kaljuste, O., and Eriksson, B. K. 2010. Recruitment failure of coastal Predatory Fish in the Baltic Sea coincident with an offshore ecosystem regime shift. - ICES Journal of Marine Science, 67: 000- 000. The dominant coastal Predatory Fish in the southwestern Baltic Sea, perch and pike, have decreased markedly in abundance during the past decade. An investigation into their recruitment at 135 coastal sites showed that both species suffered from recruitment failures, mainly in open coastal areas. A detailed study of 15 sites showed that areas with recruitment problems were also notable for mortality of early-stage larvae at the onset of exogenous food-intake. At those sites, zooplankton abundance predicted 83 and 34% of the variation in young of the year perch and pike, respectively, suggesting that the declines were caused by recruitment failure attributable to zooplankton food limitation. Incidences of recruitment failure match in time an offshore trophic cascade that generated massive increases in planktivorous sprat and decreases in zooplankton biomass in the early 1990s. Therefore, sprat biomass explained 53% of the variation in perch recruitment from 1994 to 2007 at an open coastal site, where three- spined stickleback also increased exponentially after 2002. The results indicate that the dramatic change in the offshore ecosystem may have propagated to the coast causing declines of the dominating coastal predators perch and pike followed by an increase in the abundance of small-bodied Fish.
Pär Byström - One of the best experts on this subject based on the ideXlab platform.
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The first large-scale assessment of three-spined stickleback (Gasterosteus aculeatus) biomass and spatial distribution in the Baltic Sea
ICES Journal of Marine Science, 2019Co-Authors: Jens Olsson, Egle Jakubaviciute, Olavi Kaljuste, Niklas Larsson, Ulf Bergström, Michele Casini, Massimiliano Cardinale, Joakim Hjelm, Pär ByströmAbstract:Declines in Predatory Fish in combination with the impact of climate change and eutrophication have caused planktivores, including three-spined stickleback (Gasterosteus aculeatus), to increase dra ...
Michele Casini - One of the best experts on this subject based on the ideXlab platform.
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The first large-scale assessment of three-spined stickleback (Gasterosteus aculeatus) biomass and spatial distribution in the Baltic Sea
ICES Journal of Marine Science, 2019Co-Authors: Jens Olsson, Egle Jakubaviciute, Olavi Kaljuste, Niklas Larsson, Ulf Bergström, Michele Casini, Massimiliano Cardinale, Joakim Hjelm, Pär ByströmAbstract:Declines in Predatory Fish in combination with the impact of climate change and eutrophication have caused planktivores, including three-spined stickleback (Gasterosteus aculeatus), to increase dra ...
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Stickleback increase in the Baltic Sea : A thorny issue for coastal Predatory Fish
Estuarine Coastal and Shelf Science, 2015Co-Authors: Ulf Bergström, Jens Olsson, Michele Casini, Britas Klemens Eriksson, Ronny Fredriksson, Håkan Wennhage, Magnus AppelbergAbstract:In the Baltic Sea, the mesopredator three-spined stickleback (Gasterosteus aculeatus) spends a large part of its life cycle in the open sea, but reproduces in shallow coastal habitats. In coastal waters, it may occur in high abundances, is a potent predator on eggs and larvae of Fish, and has been shown to induce trophic cascades with resulting eutrophication symptoms through regulation of invertebrate grazers. Despite its potential significance for the coastal food web, little is known about its life history and population ecology. This paper provides a description of life history traits, migration patterns and spatiotemporal development of the species in the Baltic Sea during the past decades, and tests the hypothesis that stickleback may have a negative impact on populations of coastal Predatory Fish. Offshore and coastal data during the last 30 years show that stickleback has increased fourfold in the Bothnian Sea, 45-fold in the Central Baltic Sea and sevenfold in the Southern Baltic Sea. The abundances are similar in the two northern basins, and two orders of magnitude lower in the Southern Baltic Sea. The coastward spawning migration of sticklebacks from offshore areas peaks in early May, with most spawners being two years of age at a mean length of 65 mm. The early juvenile stage is spent at the coast, whereafter sticklebacks perform a seaward feeding migration in early autumn at a size of around 35 mm. A negative spatial relation between the abundance of stickleback and early life stages of perch and pike at coastal spawning areas was observed in spatial survey data, indicating strong interactions between the species. A negative temporal relationship was observed also between adult perch and stickleback in coastal Fish monitoring programmes supporting the hypothesis that stickleback may have negative population level effects on coastal Fish predators. The recent increase in stickleback populations in different basins of the Baltic Sea in combination with negative spatiotemporal patterns and previously observed interactions between stickleback and coastal Predatory Fish suggests that this species may have gained a key role in the coastal food webs of the Baltic Sea. Through its migrations, stickleback may also constitute an important vector linking coastal and open sea ecosystem dynamics. (c) 2015 Elsevier Ltd. All rights reserved.
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recruitment failure of coastal Predatory Fish in the baltic sea coincident with an offshore ecosystem regime shift
Ices Journal of Marine Science, 2010Co-Authors: Lars Ljunggren, Olavi Kaljuste, Ulf Bergström, Michele Casini, Alfred Sandström, Gustav Johansson, Johanna Mattila, Antti Lappalainen, Goran Sundblad, Britas Klemens ErikssonAbstract:Ljunggren, L., Sandstrom, A., Bergstrom, U., Mattila, J., Lappalainen, A., Johansson, G., Sundblad, G., Casini, M., Kaljuste, O., and Eriksson, B. K. 2010. Recruitment failure of coastal Predatory Fish in the Baltic Sea coincident with an offshore ecosystem regime shift. - ICES Journal of Marine Science, 67: 000- 000. The dominant coastal Predatory Fish in the southwestern Baltic Sea, perch and pike, have decreased markedly in abundance during the past decade. An investigation into their recruitment at 135 coastal sites showed that both species suffered from recruitment failures, mainly in open coastal areas. A detailed study of 15 sites showed that areas with recruitment problems were also notable for mortality of early-stage larvae at the onset of exogenous food-intake. At those sites, zooplankton abundance predicted 83 and 34% of the variation in young of the year perch and pike, respectively, suggesting that the declines were caused by recruitment failure attributable to zooplankton food limitation. Incidences of recruitment failure match in time an offshore trophic cascade that generated massive increases in planktivorous sprat and decreases in zooplankton biomass in the early 1990s. Therefore, sprat biomass explained 53% of the variation in perch recruitment from 1994 to 2007 at an open coastal site, where three- spined stickleback also increased exponentially after 2002. The results indicate that the dramatic change in the offshore ecosystem may have propagated to the coast causing declines of the dominating coastal predators perch and pike followed by an increase in the abundance of small-bodied Fish.
Jens Olsson - One of the best experts on this subject based on the ideXlab platform.
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The first large-scale assessment of three-spined stickleback (Gasterosteus aculeatus) biomass and spatial distribution in the Baltic Sea
ICES Journal of Marine Science, 2019Co-Authors: Jens Olsson, Egle Jakubaviciute, Olavi Kaljuste, Niklas Larsson, Ulf Bergström, Michele Casini, Massimiliano Cardinale, Joakim Hjelm, Pär ByströmAbstract:Declines in Predatory Fish in combination with the impact of climate change and eutrophication have caused planktivores, including three-spined stickleback (Gasterosteus aculeatus), to increase dra ...
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Past and Current Trends of Coastal Predatory Fish in the Baltic Sea with a Focus on Perch, Pike, and Pikeperch
Fishes, 2019Co-Authors: Jens OlssonAbstract:Coastal Predatory Fish are of key importance for the provisioning of ecosystem services in the Baltic Sea. Worldwide, however, there has been a general and sharp decline in Predatory Fish populations, in turn threatening the viability and function of marine ecosystems. On the basis of the literature, the past (data until the 2000s) and current (data until early and mid 2010s) trends in abundance of coastal Predatory Fish in the Baltic Sea are reviewed in this paper. Potentially important impacting factors behind the temporal development of the populations and measures to strengthen and restore them are also discussed. Available data from coastal Fish monitoring programs suggest a stable or increasing abundance of coastal Predatory Fish as a functional group and for the species perch in the majority of areas assessed in the Baltic Sea. For pike and pikeperch, data to support assessments is scarce, but suggest substantial declines in the abundance of both species in most assessed areas. The impacting factors behind these patterns vary between species and areas, but include climate, habitat exploitation, Fishing, and species-interactions in the coastal food web. Measures to restore and support coastal Predatory Fish communities should follow an ecosystem-based approach to management and include efforts to regulate Fisheries sectors in combination with habitat protection and restoration.
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Stickleback increase in the Baltic Sea : A thorny issue for coastal Predatory Fish
Estuarine Coastal and Shelf Science, 2015Co-Authors: Ulf Bergström, Jens Olsson, Michele Casini, Britas Klemens Eriksson, Ronny Fredriksson, Håkan Wennhage, Magnus AppelbergAbstract:In the Baltic Sea, the mesopredator three-spined stickleback (Gasterosteus aculeatus) spends a large part of its life cycle in the open sea, but reproduces in shallow coastal habitats. In coastal waters, it may occur in high abundances, is a potent predator on eggs and larvae of Fish, and has been shown to induce trophic cascades with resulting eutrophication symptoms through regulation of invertebrate grazers. Despite its potential significance for the coastal food web, little is known about its life history and population ecology. This paper provides a description of life history traits, migration patterns and spatiotemporal development of the species in the Baltic Sea during the past decades, and tests the hypothesis that stickleback may have a negative impact on populations of coastal Predatory Fish. Offshore and coastal data during the last 30 years show that stickleback has increased fourfold in the Bothnian Sea, 45-fold in the Central Baltic Sea and sevenfold in the Southern Baltic Sea. The abundances are similar in the two northern basins, and two orders of magnitude lower in the Southern Baltic Sea. The coastward spawning migration of sticklebacks from offshore areas peaks in early May, with most spawners being two years of age at a mean length of 65 mm. The early juvenile stage is spent at the coast, whereafter sticklebacks perform a seaward feeding migration in early autumn at a size of around 35 mm. A negative spatial relation between the abundance of stickleback and early life stages of perch and pike at coastal spawning areas was observed in spatial survey data, indicating strong interactions between the species. A negative temporal relationship was observed also between adult perch and stickleback in coastal Fish monitoring programmes supporting the hypothesis that stickleback may have negative population level effects on coastal Fish predators. The recent increase in stickleback populations in different basins of the Baltic Sea in combination with negative spatiotemporal patterns and previously observed interactions between stickleback and coastal Predatory Fish suggests that this species may have gained a key role in the coastal food webs of the Baltic Sea. Through its migrations, stickleback may also constitute an important vector linking coastal and open sea ecosystem dynamics. (c) 2015 Elsevier Ltd. All rights reserved.
Olavi Kaljuste - One of the best experts on this subject based on the ideXlab platform.
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The first large-scale assessment of three-spined stickleback (Gasterosteus aculeatus) biomass and spatial distribution in the Baltic Sea
ICES Journal of Marine Science, 2019Co-Authors: Jens Olsson, Egle Jakubaviciute, Olavi Kaljuste, Niklas Larsson, Ulf Bergström, Michele Casini, Massimiliano Cardinale, Joakim Hjelm, Pär ByströmAbstract:Declines in Predatory Fish in combination with the impact of climate change and eutrophication have caused planktivores, including three-spined stickleback (Gasterosteus aculeatus), to increase dra ...
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recruitment failure of coastal Predatory Fish in the baltic sea coincident with an offshore ecosystem regime shift
Ices Journal of Marine Science, 2010Co-Authors: Lars Ljunggren, Olavi Kaljuste, Ulf Bergström, Michele Casini, Alfred Sandström, Gustav Johansson, Johanna Mattila, Antti Lappalainen, Goran Sundblad, Britas Klemens ErikssonAbstract:Ljunggren, L., Sandstrom, A., Bergstrom, U., Mattila, J., Lappalainen, A., Johansson, G., Sundblad, G., Casini, M., Kaljuste, O., and Eriksson, B. K. 2010. Recruitment failure of coastal Predatory Fish in the Baltic Sea coincident with an offshore ecosystem regime shift. - ICES Journal of Marine Science, 67: 000- 000. The dominant coastal Predatory Fish in the southwestern Baltic Sea, perch and pike, have decreased markedly in abundance during the past decade. An investigation into their recruitment at 135 coastal sites showed that both species suffered from recruitment failures, mainly in open coastal areas. A detailed study of 15 sites showed that areas with recruitment problems were also notable for mortality of early-stage larvae at the onset of exogenous food-intake. At those sites, zooplankton abundance predicted 83 and 34% of the variation in young of the year perch and pike, respectively, suggesting that the declines were caused by recruitment failure attributable to zooplankton food limitation. Incidences of recruitment failure match in time an offshore trophic cascade that generated massive increases in planktivorous sprat and decreases in zooplankton biomass in the early 1990s. Therefore, sprat biomass explained 53% of the variation in perch recruitment from 1994 to 2007 at an open coastal site, where three- spined stickleback also increased exponentially after 2002. The results indicate that the dramatic change in the offshore ecosystem may have propagated to the coast causing declines of the dominating coastal predators perch and pike followed by an increase in the abundance of small-bodied Fish.
