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Nilsson, Jonas
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Donadi, S., Olin, A., Casini, M., Eklöf, J., Erlandsson, M., Fredriksson, R., . . . Bergström, U. (2024). Reduced predation and competition from herring may have contributed to the increase of three-spined stickleback in the Baltic Sea. ICES Journal of Marine Science
Öppna denna publikation i ny flik eller fönster >>Reduced predation and competition from herring may have contributed to the increase of three-spined stickleback in the Baltic Sea
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2024 (Engelska)Ingår i: ICES Journal of Marine Science, ISSN 1054-3139, E-ISSN 1095-9289Artikel i tidskrift (Refereegranskat) Epub ahead of print
Abstract [en]

In many areas of the Baltic Sea, three-spined stickleback (Gasterosteus aculeatus) has increased several fold since the early 2000s. Two major planktivores of the Baltic Sea, Atlantic herring (Clupea harengus) and European sprat (Sprattus sprattus), may interact with stickleback via competition for food and predation, but the potential implications at the population level are still unknown. Here, we explored interactions between stickleback, herring, and sprat using (i) herring diet analyses and (ii) fish biomass estimates from hydroacoustics for 2001-2019 covering the largest Baltic Sea basins-the Central Baltic and the Bothnian Sea. The diet analyses revealed that stickleback is an important prey for large herring along the Swedish Baltic Sea coast, comprising up to 64% of the diet of individuals >22 cm. We found a negative influence of large herring (>18 cm) on stickleback in the Central Baltic, and a negative relationship between sprat and small herring (<18 cm) (pooled) and stickleback in the Bothnian Sea. The decline in herring and sprat population after the mid-1990s could have contributed to the increase in stickleback population via reduced predation and competition. Overall, herring may be an underappreciated piscivore, and high fishing pressure on herring could generate cascading effects on lower trophic levels.

Ort, förlag, år, upplaga, sidor
Oxford University Press, 2024
Nyckelord
three-spined stickleback, Atlantic herring, sprat, Baltic Sea, temporal trends, species interactions, predation, competition
Nationell ämneskategori
Ekologi
Forskningsämne
Ekologi, Akvatisk ekologi
Identifikatorer
urn:nbn:se:lnu:diva-134341 (URN)10.1093/icesjms/fsae168 (DOI)001380345000001 ()
Tillgänglig från: 2025-01-14 Skapad: 2025-01-14 Senast uppdaterad: 2025-01-14
Majaneva, S., Fridolfsson, E., Casini, M., Legrand, C., Lindehoff, E., Margonski, P., . . . Hylander, S. (2020). Deficiency syndromes in top predators associated with large-scale changes in the Baltic Sea ecosystem. PLOS ONE, 15(1), 1-21, Article ID e0227714.
Öppna denna publikation i ny flik eller fönster >>Deficiency syndromes in top predators associated with large-scale changes in the Baltic Sea ecosystem
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2020 (Engelska)Ingår i: PLOS ONE, E-ISSN 1932-6203, Vol. 15, nr 1, s. 1-21, artikel-id e0227714Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Vitamin B1 (thiamin) deficiency is an issue periodically affecting a wide range of taxa worldwide. In aquatic pelagic systems, thiamin is mainly produced by bacteria and phytoplankton and is transferred to fish and birds via zooplankton, but there is no general consensus on when or why this transfer is disrupted. We focus on the occurrence in salmon (Salmo salar) of a thiamin deficiency syndrome (M74), the incidence of which is highly correlated among populations derived from different spawning rivers. Here, we show that M74 in salmon is associated with certain large-scale abiotic changes in the main common feeding area of salmon in the southern Baltic Sea. Years with high M74 incidence were characterized by stagnant periods with relatively low salinity and phosphate and silicate concentrations but high total nitrogen. Consequently, there were major changes in phytoplankton and zooplankton, with, e.g., increased abundances of Cryptophyceae, Dinophyceae, Diatomophyceae and Euglenophyceae and Acartia spp. during high M74 incidence years. The prey fish communities also had increased stocks of both herring and sprat in these years. Overall, this suggests important changes in the entire food web structure and nutritional pathways in the common feeding period during high M74 incidence years. Previous research has emphasized the importance of the abundance of planktivorous fish for the occurrence of M74. By using this 27-year time series, we expand this analysis to the entire ecosystem and discuss potential mechanisms inducing thiamin deficiency in salmon.

Ort, förlag, år, upplaga, sidor
Public Library of Science, 2020
Nationell ämneskategori
Ekologi
Forskningsämne
Ekologi, Akvatisk ekologi
Identifikatorer
urn:nbn:se:lnu:diva-91079 (URN)10.1371/journal.pone.0227714 (DOI)000534341100034 ()31917814 (PubMedID)2-s2.0-85077674077 (Scopus ID)
Forskningsfinansiär
Forskningsrådet Formas, 215-2012-1319Carl Tryggers stiftelse för vetenskaplig forskning Kungliga Vetenskapsakademien
Tillgänglig från: 2020-01-21 Skapad: 2020-01-21 Senast uppdaterad: 2023-02-06Bibliografiskt granskad
Nilsson, J., Flink, H. & Tibblin, P. (2019). Predator-prey role reversal may impair the recovery of declining pike populations. Journal of Animal Ecology, 88(6), 927-939
Öppna denna publikation i ny flik eller fönster >>Predator-prey role reversal may impair the recovery of declining pike populations
2019 (Engelska)Ingår i: Journal of Animal Ecology, ISSN 0021-8790, E-ISSN 1365-2656, Vol. 88, nr 6, s. 927-939Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Many fish populations have experienced declines in recent decades due to anthropogenic disturbances, such as overfishing and habitat exploitation. Despite management actions, many populations show a limited capacity to recover. This may be attributed to reversal of predator-prey roles, yet empirical evidence to that effect remains scarce. Here, we combine field and laboratory studies to investigate the interaction between pike (Esox lucius), a large keystone top predatory fish, and the small-bodied mesopredatory threespine stickleback (Gasterosteus aculeatus) in the Baltic Sea where pike populations have declined. Our data suggest that stickleback predation on pike larvae depletes a large proportion of the recruitment and influences the size distribution through size-selective predation, which is corroborated by a gape-limitation experiment and diet analysis of wild-captured sticklebacks. The effects of stickleback predation are present across several populations and years, and our data suggest that early arrival of sticklebacks has stronger effects on juvenile pike survival. Finally, we use data on pike gape-limitation and the size distribution of sticklebacks to illustrate the process of role reversal. These findings suggest that mesopredator behaviour can reduce recruitment of a top predator species and impair the capacity of populations to recover. This emphasizes predator-prey role reversal as an important ecological and evolutionary driver that influences the outcome of restoration and management actions.

Ort, förlag, år, upplaga, sidor
John Wiley & Sons, 2019
Nyckelord
conservation, depensation effects, ecosystem dynamics, gape-limitation, hysteresis, interspecific interactions, intraguild predation, population recovery
Nationell ämneskategori
Ekologi
Forskningsämne
Ekologi, Akvatisk ekologi
Identifikatorer
urn:nbn:se:lnu:diva-86920 (URN)10.1111/1365-2656.12981 (DOI)000472660900011 ()30895606 (PubMedID)2-s2.0-85064525139 (Scopus ID)
Tillgänglig från: 2019-07-18 Skapad: 2019-07-18 Senast uppdaterad: 2022-08-22Bibliografiskt granskad
Engstedt, O., Nilsson, J. & Larsson, P. (2018). Habitat restoration: A sustainable key to management (1ed.). In: Christian Skov and Anders Nilsson (Ed.), Biology and Ecology of Pike: (pp. 248-268). Boca Ratón: CRC Press
Öppna denna publikation i ny flik eller fönster >>Habitat restoration: A sustainable key to management
2018 (Engelska)Ingår i: Biology and Ecology of Pike / [ed] Christian Skov and Anders Nilsson, Boca Ratón: CRC Press, 2018, 1, s. 248-268Kapitel i bok, del av antologi (Refereegranskat)
Ort, förlag, år, upplaga, sidor
Boca Ratón: CRC Press, 2018 Upplaga: 1
Nyckelord
Pike, Esox lucius, habitat restoration, Baltic Sea
Nationell ämneskategori
Ekologi
Forskningsämne
Ekologi, Akvatisk ekologi
Identifikatorer
urn:nbn:se:lnu:diva-80403 (URN)000450028100010 ()9781482262902 (ISBN)
Tillgänglig från: 2019-02-12 Skapad: 2019-02-12 Senast uppdaterad: 2022-11-08Bibliografiskt granskad
Larsson, P., Tibblin, P., Koch-Schmidt, P., Engstedt, O., Nilsson, J., Nordahl, O. & Forsman, A. (2015). Ecology, evolution, and management strategies of northern pike populations in the Baltic Sea. Ambio, 44(Supplement 3), S451-S461
Öppna denna publikation i ny flik eller fönster >>Ecology, evolution, and management strategies of northern pike populations in the Baltic Sea
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2015 (Engelska)Ingår i: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 44, nr Supplement 3, s. S451-S461Artikel, forskningsöversikt (Refereegranskat) Published
Abstract [en]

Baltic Sea populations of the northern pike (Esox lucius) have declined since the 1990s, and they face additional challenges due to ongoing climate change. Pike in the Baltic Sea spawn either in coastal bays or in freshwater streams and wetlands. Pike recruited in freshwater have been found to make up about 50 % of coastal pike stocks and to show natal homing, thus limiting gene flow among closely located spawning sites. Due to natal homing, sub-populations appear to be locally adapted to their freshwater recruitment environments. Management actions should therefore not involve mixing of individuals originating from different sub-populations. We offer two suggestions complying with this advice: (i) productivity of extant freshwater spawning populations can be boosted by modifying wetlands such that they promote spawning and recruitment; and (ii) new sub-populations that spawn in brackish water can potentially be created by transferring fry and imprinting them on seemingly suitable spawning environments.

Nyckelord
climate change conservation, Esox lucius, habitat, Baltic Sea
Nationell ämneskategori
Ekologi
Forskningsämne
Ekologi, Akvatisk ekologi
Identifikatorer
urn:nbn:se:lnu:diva-43193 (URN)10.1007/s13280-015-0664-6 (DOI)000362290800012 ()2-s2.0-84937573371 (Scopus ID)
Projekt
EcochangeStiftelsen Olle Engqvist Byggmästare
Forskningsfinansiär
Ecosystem dynamics in the Baltic Sea in a changing climate perspective - ECOCHANGE
Tillgänglig från: 2015-05-12 Skapad: 2015-05-12 Senast uppdaterad: 2023-08-31Bibliografiskt granskad
Tibblin, P., Forsman, A., Koch-Schmidt, P., Nordahl, O., Johannessen, P., Nilsson, J. & Larsson, P. (2015). Evolutionary divergence of adult body size and juvenile growth in sympatric subpopulations of a top predator in aquatic ecosystems. American Naturalist, 186(1), 98-110
Öppna denna publikation i ny flik eller fönster >>Evolutionary divergence of adult body size and juvenile growth in sympatric subpopulations of a top predator in aquatic ecosystems
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2015 (Engelska)Ingår i: American Naturalist, ISSN 0003-0147, E-ISSN 1537-5323, Vol. 186, nr 1, s. 98-110Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Evolutionary theory predicts that different selective regimes may contribute to divergent evolution of body size and growth rate among populations, but most studies have focused on allopatric populations. Here, we studied five sympatric subpopulations of anadromous northern pike (Esox lucius) in the Baltic Sea subjected to allopatric habitats for a short period of their life cycle due to homing behavior. We report differences in adult body size among subpopulations that were in part due to variation in growth rate. Body size of emigrating juveniles also differed among subpopulations, and differences remained when individuals were reared in a common environment, thus indicating evolutionary divergence among subpopulations. Furthermore, a QST-FST comparison indicated that differences had evolved due to divergent selection rather than genetic drift, possibly in response to differences in selective mortality among spawning habitats during the allopatric life stage. Adult and juvenile size were negatively correlated across subpopulations, and reconstruction of growth trajectories of adult fishes suggested that body size differences developed gradually and became accentuated throughout the first years of life. These results represent rare evidence that sympatric subpopulations can evolve differences in key life-history traits despite being subjected to allopatric habitats during only a very short fraction of their life.

Nationell ämneskategori
Evolutionsbiologi
Forskningsämne
Ekologi, Evolutionsbiologi
Identifikatorer
urn:nbn:se:lnu:diva-43212 (URN)10.1086/681597 (DOI)000356632700011 ()26098342 (PubMedID)2-s2.0-84933575222 (Scopus ID)
Projekt
EcoChange
Tillgänglig från: 2015-05-13 Skapad: 2015-05-13 Senast uppdaterad: 2021-05-05Bibliografiskt granskad
Moksnes, P.-O., Albersson, J., Elfwing, T., Hansen, J. & Nilsson, J. (2014). Havsmiljöns tillstånd ur miljömålsperspektiv. In: Marie Svärd, Tina Johansen & Maria Lewander (Ed.), Havet 2013/2014: Om miljötillståndet i våra svenska havsområden (pp. 6-9). Stockholm: Naturvårdsverket
Öppna denna publikation i ny flik eller fönster >>Havsmiljöns tillstånd ur miljömålsperspektiv
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2014 (Svenska)Ingår i: Havet 2013/2014: Om miljötillståndet i våra svenska havsområden / [ed] Marie Svärd, Tina Johansen & Maria Lewander, Stockholm: Naturvårdsverket, 2014, s. 6-9Kapitel i bok, del av antologi (Refereegranskat)
Ort, förlag, år, upplaga, sidor
Stockholm: Naturvårdsverket, 2014
Serie
Havet, ISSN 1654-6741 ; 2013/14
Nationell ämneskategori
Miljövetenskap
Forskningsämne
Naturvetenskap
Identifikatorer
urn:nbn:se:lnu:diva-51691 (URN)9789163757372 (ISBN)
Tillgänglig från: 2016-03-31 Skapad: 2016-03-31 Senast uppdaterad: 2016-04-19Bibliografiskt granskad
Nilsson, J. (2014). Inventering av det strandnära yngel och småfisksamhället i Kalmar, Mönsterås och Västervik, juni 2014. Linnéuniveritetet, Institutionen för biologi och miljö
Öppna denna publikation i ny flik eller fönster >>Inventering av det strandnära yngel och småfisksamhället i Kalmar, Mönsterås och Västervik, juni 2014
2014 (Svenska)Rapport (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Linnéuniveritetet, Institutionen för biologi och miljö, 2014. s. 6
Serie
Rapport - Kalmarsundslaboratoriet, ISSN 1402-6198 ; 2014:6
Nationell ämneskategori
Ekologi
Forskningsämne
Ekologi, Akvatisk ekologi
Identifikatorer
urn:nbn:se:lnu:diva-51708 (URN)
Tillgänglig från: 2016-03-31 Skapad: 2016-03-31 Senast uppdaterad: 2016-04-08Bibliografiskt granskad
Nilsson, J. (2014). Tånglake. Havsutsikt (2), 24-24
Öppna denna publikation i ny flik eller fönster >>Tånglake
2014 (Svenska)Ingår i: Havsutsikt, ISSN 1104-0513, nr 2, s. 1s. 24-24Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm)) Published
Abstract [sv]

Tånglake, Zoarces viviparus, är allmänt förekommande längs med hela den svenska kusten, ända från Skagerack till Bottniska viken. Arten är bottenlevande och påträffas oftast på relativt grunt vatten. På sommaren lever tånglaken på lite djupare vatten, men då temperaturen sjunker på senhösten kommer den in på de grundare områdena. Under vintern är det inte ovanligt att man hittar den i hålrum under stenar. Tånglaken trivs i kallt vatten, och är en av de arter som missgynnas av klimatförändringar.

Förlag
s. 1
Nationell ämneskategori
Zoologi
Forskningsämne
Naturvetenskap, Ekologisk kemi; Naturvetenskap, Ekologisk kemi
Identifikatorer
urn:nbn:se:lnu:diva-51681 (URN)
Tillgänglig från: 2016-03-31 Skapad: 2016-03-31 Senast uppdaterad: 2016-03-31Bibliografiskt granskad
Nilsson, J., Engstedt, O. & Larsson, P. (2014). Wetlands for northern pike (Esox lucius L.) recruitment in the Baltic Sea. Hydrobiologia, 721(1), 145-154
Öppna denna publikation i ny flik eller fönster >>Wetlands for northern pike (Esox lucius L.) recruitment in the Baltic Sea
2014 (Engelska)Ingår i: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 721, nr 1, s. 145-154Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In recent decades, wetlands have been constructed or restored around the Baltic sea to counteract the eutrophication of its coastal waters. Some of these wetlands could also be suitable spawning and nursery areas for anadromous northern pike (Esox lucius L.). We studied juvenile pike production in three coastal wetlands along the south-eastern coast of Sweden that were restored in different ways. Where terrestrial vegetation was temporarily flooded, pike larval/juvenile emigration increased from a few thousand individuals before restoration to over a hundred thousand afterwards. We suggest that vegetation was the key to this successful reproduction, as wetlands where vegetation was removed or reduced saw no similar increase in pike production. Flooded vegetation in shallow waters offers optimal spawning conditions, increased food resources, and refuge from predation. The growth and emigration of larvae and juveniles were followed over time, revealing that 80-95% of individuals left the wetlands within 1 month (at a size < 6 cm). This emigration probably represents an adaption to seasonally decreasing water levels but may also be a way to avoid cannibalism.

Nyckelord
Anadromous, Baltic Sea, Esox lucius, Northern pike, Pike factory, Restoration, Wetlands
Nationell ämneskategori
Ekologi
Forskningsämne
Ekologi, Akvatisk ekologi
Identifikatorer
urn:nbn:se:lnu:diva-31269 (URN)10.1007/s10750-013-1656-9 (DOI)000327129300014 ()2-s2.0-84887998080 (Scopus ID)
Tillgänglig från: 2013-12-16 Skapad: 2013-12-16 Senast uppdaterad: 2021-05-05Bibliografiskt granskad
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