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  • 1.
    Engkvist, Roland
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Malm, Torleif
    Nilsson, Jonas
    Possible modification of grazing effects by wave action, changing the relative dominance between Fucus serratus and Fucus vesiculosus in the southern Baltic SeaManuscript (preprint) (Other academic)
  • 2.
    Engkvist, Roland
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Nilsson, Jonas
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Malmfjärden - vatten och biologi 20112013Report (Other academic)
    Download full text (pdf)
    LNU 2013 6 Malmfjarden_vatten_biologi.pdf
  • 3.
    Engstedt, Olof
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Nilsson, Jonas
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Larsson, Per
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Habitat restoration: A sustainable key to management2018In: Biology and Ecology of Pike / [ed] Christian Skov and Anders Nilsson, Boca Ratón: CRC Press, 2018, 1, p. 248-268Chapter in book (Refereed)
  • 4.
    Larsson, Per
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Tibblin, Petter
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Koch-Schmidt, Per
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Engstedt, Olof
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Nilsson, Jonas
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Nordahl, Oscar
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Forsman, Anders
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Ecology, evolution, and management strategies of northern pike populations in the Baltic Sea2015In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 44, no Supplement 3, p. S451-S461Article, review/survey (Refereed)
    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.

  • 5.
    Majaneva, Sanna
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. UiT The Arctic University of Norway, Norway;Norwegian University of Science and Technology, Norway.
    Fridolfsson, Emil
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Casini, Michele
    Swedish University of Agricultural Sciences, Sweden.
    Legrand, Catherine
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Linnaeus University, Linnaeus Knowledge Environments, Water.
    Lindehoff, Elin
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Linnaeus University, Linnaeus Knowledge Environments, Water.
    Margonski, Piotr
    National Marine Fisheries Research Institute, Poland.
    Majaneva, Markus
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Norwegian University of Science and Technology, Norway.
    Nilsson, Jonas
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Rubene, Gunta
    Institute of Food Safety Animal Health and Environment BIOR, Latvia.
    Wasmund, Norbert
    Leibniz-Institute for Baltic Sea Research, Germany.
    Hylander, Samuel
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Linnaeus University, Linnaeus Knowledge Environments, Water.
    Deficiency syndromes in top predators associated with large-scale changes in the Baltic Sea ecosystem2020In: PLOS ONE, E-ISSN 1932-6203, Vol. 15, no 1, p. 1-21, article id e0227714Article in journal (Refereed)
    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.

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    fulltext
  • 6. Moksnes, Per-Olav
    et al.
    Albersson, Jan
    Elfwing, Tina
    Hansen, Joakim
    Nilsson, Jonas
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Havsmiljöns tillstånd ur miljömålsperspektiv2014In: Havet 2013/2014: Om miljötillståndet i våra svenska havsområden / [ed] Marie Svärd, Tina Johansen & Maria Lewander, Stockholm: Naturvårdsverket, 2014, p. 6-9Chapter in book (Refereed)
  • 7.
    Nilsson, Jonas
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Inventering av det strandnära yngel och småfisksamhället i Kalmar, Mönsterås och Västervik, juni 20142014Report (Other academic)
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    LNU 2014_6 Inventering storspigg.pdf
  • 8.
    Nilsson, Jonas
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Predation of northern pike (Esox lucius L.) eggs: A possible cause of regionally poor recruitment in the Baltic Sea2006In: Hydrobiologia, Vol. 553, p. 161-169Article in journal (Refereed)
  • 9.
    Nilsson, Jonas
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Sedimentundersökning i Lindöfjärden, Malmfjärden och Fredrikskanskanalen i Kalmar kommun, december 20112013Report (Other academic)
    Abstract [sv]

    Inför en eventuell muddring av Malmfjärden i centrala Kalmar genomfördes en kartläggning av sedimentets innehåll av tungmetaller inklusive kvicksilver samt ett antal organiska föreningar. Undersökningen utfördes på totalt 15 platser i Lindöfjärden, Malmfjärden och Fredrikskanskanalen. En analys av sedimentets föroreningsnivå gjordes sedan på sex av dessa stationer. Undersökningen visar att det lösa sedimentets mäktighet varierar mellan 45 och 90 cm, och att det utgörs av en lergyttja med en organisk halt på ungefär 14 %. Halterna av flera tungmetaller som t ex bly, kadmium, koppar och zink samt av vissa organiska ämnen som t ex PAH var höga eller mycket höga. Högst föroreningsnivå hade sedimentet i området mellan Lindö och Fredrikskans och i Fredrikskanskanalen.

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    LNU 2013 5 sediment Malmfjärden.pdf
  • 10.
    Nilsson, Jonas
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Tånglake2014In: Havsutsikt, ISSN 1104-0513, no 2, p. 1p. 24-24Article in journal (Other (popular science, discussion, etc.))
    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.

  • 11.
    Nilsson, Jonas
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Uppföljning av gäddfabriken vid Kronobäck i Mönsterås kommun, våren 20132013Report (Other academic)
    Abstract [sv]

    Under vintern 2007 och våren 2008 genomfördes biotopvårdande åtgärder som syftade till att förbättra för den anadroma gäddans lek- och yngeluppväxt i området vid Oknebäck och Kronobäck i Mönsterås kommun. Åtgärden som genomfördes var framgångsrik och resulterade omedelbart i en ökning av antalet utvandrande gäddyngel från några tusen till över hundratusen per år. Gäddfabriken vid Kronobäck fick stor publicitet och har stått som förebild för många liknande åtgärder som genomförts i södra Sverige. Planering och projektering av gäddfabriken vid Kronobäck utfördes av Mönsterås kommun i samarbete med markägare, Fiskeriverket och Linnéuniversitetet. Projektet finansierades till 50 % med EU-medel (Fonden för fiskets utveckling) via Fiskeriverket. Resterande andel nationell finansiering beviljades från Mönsterås kommun och Länsstyrelsen i Kalmar län. I Fiskeriverkets beslut (Dnr 031-932-06) fanns krav på en uppföljning av projektet. Detta gjordes gemensamt av Fiskeriverkets kustlaboratium och Linnéuniversitet i ett forskningsprogram under åren 2007-2009. En utförlig beskrivning av åtgärderna och resultat från uppföljningen presenteras i Ljunggren mfl (2011). Enligt Fiskeriverkets beslut skulle även en uppföljning genomföras under 2013, fem år efteråtgärderna. Resultatet av uppföljningen redovisas i denna rapport. Fältarbetet 2013 utfördes av Joakim Holm och Jens Nilsson, Mönsterås kommun och av Petter Tibblin, Oscar Nordahl, Simon Nilsson och Jonas Nilsson vid Institutionen för biologi och miljö, Linnéuniversitetet i Kalmar. Årets uppföljning finansierades gemensamt av Mönsterås kommun, Länsstyrelsen i Kalmar län och Linnéuniversitet.

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    LNU 2013 10 Kronobäck.pdf
  • 12.
    Nilsson, Jonas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Andersson, Jan
    Karås, Peter
    Sandström, Olof
    Recruitment failure and decreasing catches of perch (Perca fluviatilis L.) and pike (Esox lucius L.) in the coastal waters of southeast Sweden2004In: Boreal Environment Research, Vol. 9, p. 295-306Article in journal (Refereed)
  • 13.
    Nilsson, Jonas
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Andersson, Susanna
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Marin inventering i Bräkne-Hoby skärgård och yttre delen av Sonekullaviken, Blekinge, oktober 20122012Report (Other academic)
    Download full text (pdf)
    LNU 2012 15 Bräkne Hoby.pdf
  • 14.
    Nilsson, Jonas
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Andersson, Susanna
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Marin inventering vid Stärnöhalvön och Boön, Blekinge, oktober 20122012Report (Other academic)
    Download full text (pdf)
    LNU 2012 14 Stärnö.pdf
  • 15.
    Nilsson, Jonas
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Engstedt, Olof
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Larsson, Per
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Wetlands for northern pike (Esox lucius L.) recruitment in the Baltic Sea2014In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 721, no 1, p. 145-154Article in journal (Refereed)
    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.

  • 16.
    Nilsson, Jonas
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Flink, Henrik
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Tibblin, Petter
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Predator-prey role reversal may impair the recovery of declining pike populations2019In: Journal of Animal Ecology, ISSN 0021-8790, E-ISSN 1365-2656, Vol. 88, no 6, p. 927-939Article in journal (Refereed)
    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.

  • 17.
    Nilsson, Jonas
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Larsson, Per
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Engstedt, Olof
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Gäddors lek engagerar många2013In: Havsutsikt, Stockholms universitets Östersjöcentrum och Umeå marina forskningscentrum, Umeå universitet , 2013, , p. 3p. 10-12Chapter in book (Other (popular science, discussion, etc.))
  • 18.
    Nilsson, Jonas
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Malm, Torleif
    Stockholm University.
    Engkvist, Roland
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Interaction between isopod grazing and wave action: a structuring force in macroalgal communities in the southern Baltic Sea2004In: Aquatic Ecology, ISSN 1386-2588, E-ISSN 1573-5125, Vol. 38, no 3, p. 403-413Article in journal (Refereed)
    Abstract [en]

    The macroalgal belt in the southern Baltic Sea may be partly structured by the interaction of physical and biological factors. A field study, spanning the 1990s, describes a rapid decline of the Fucus spp. stands along the wave-exposed Swedish southeast coast. During this period, a relative dominance of Fucus vesiculosus L. shifted to a relative dominance of Fucus serratus L. The decline of F. vesiculosus coincided with observations of large numbers of the grazing isopods Idotea baltica (Pallas) and Idotea granulosa Rathke, or with field observations of frequent grazing marks on Fucus fronds. I. baltica, but not I. granulosa, tended to aggregate in the declining Fucus spp. stands, indicating a strong preference for Fucus spp. In a mesocosm experiment I. baltica, when given a choice, grazed both Fucus species at weak water motion. At strong water motion grazing was concentrated on F. vesiculosus. It is hypothesized that one of the reasons I. baltica preferred F. vesiculosus to F. serratus at strong water motion may have been differences in habitat quality, like width of thallus, influencing the ability to cling to the plant. Smaller thallus, as in F. vesiculosus, thus is the preferred habitat for grazing of I. blatica. We postulate that the existence of F. serratus in the area may be favoured by strong wave action and moderate but not strong grazing by I. baltica, relaxing the interspecific competition from F. vesiculosus.

  • 19.
    Nilsson, Jonas
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Moksnes, Per-Olav
    Elfwing, Tina
    Rolff, Carl
    Wikner, Johan
    Havsmiljöns tillstånd ur miljömålsperspektiv2011In: Havet 2011: Om miljötillståndet i svenska havsområden / [ed] Maria Lewander, Malin Karlsson & Karin Lundberg, Naturvårdsverket, Havsmiljöinstitutet, Havs- och vattenmyndigheten , 2011, , p. 112p. 8-12Chapter in book (Other academic)
  • 20. Thiere, Geraldine
    et al.
    Nilsson, Jonas
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Minnhagen, Susanna
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Foks, Renate
    Uppföljning och förslag på restaurering av anlagda våtmarker i Kalmar kommun2012Report (Other academic)
    Abstract [sv]

    Den 30 mars 2012 beviljade Länsstyrelsen i Kalmarbidrag till Kalmar kommun för det lokala vattenvårdsprojektet ”Uppföljning och restaurering av våtmarker i Kalmar kommun”. Projektet genomfördes under perioden 25 mars – 30 november i samarbete med miljöanalytiker Jonas Nilsson vid Havsmiljöinstitutets enhet vid Linnéuniversitetet och våtmarksexpert Geraldine Thiere. Delar av projektet genomfördes som ett examensarbete i miljövetenskap av Jessica Olofsson, Linnéuniversitetet. En bedömning visade att majoriteten av de inventerade våtmarkerna ur näringsretentionssynpunkt inte var placerade på optimala ställen. Flera hade till exempel en alldeles för liten andel åkermark i tillrinningsområdet. Andra var placerade för långt från recipienten. Även den lokala utformningenav respektive våtmark kunde i många fall varit bättre. Flera våtmarker var till exempel utformade så att vattenytans form ledde till låg hydraulisk effektivitet. Listan över negativ kritik i rapporten är visserligen lång, men den visar samtidigt att det finns stor utvecklingspotential vid anläggning av nya närsaltsfällor i Kalmar län.

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    LNU 2012 12 Lova Våtmarker .pdf
  • 21.
    Tibblin, Petter
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Forsman, Anders
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Koch-Schmidt, Per
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Nordahl, Oscar
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Johannessen, Peter
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Nilsson, Jonas
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Larsson, Per
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Evolutionary divergence of adult body size and juvenile growth in sympatric subpopulations of a top predator in aquatic ecosystems2015In: American Naturalist, ISSN 0003-0147, E-ISSN 1537-5323, Vol. 186, no 1, p. 98-110Article in journal (Refereed)
    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.

  • 22.
    Wikner, Johan
    et al.
    Havsmiljöinstitutet.
    Albertsson, Jan
    Havsmiljöinstitutet.
    Elfwing, Tina
    Havsmiljöinstitutet.
    Moksnes, Per-Olav
    Havsmiljöinstitutet.
    Nilsson, Jonas
    Havsmiljöinstitutet.
    Omstedt, Anders
    Havsmiljöinstitutet.
    Rolff, Carl
    Havsmiljöinstitutet.
    Havsmiljöns tillstånd ur miljömålsperspektiv2012In: Havet 2012: Om miljötillståndet i svenska havsområden, Havsmiljöinstitutet , 2012, , p. 116p. 6-12Chapter in book (Other academic)
    Abstract [sv]

    Det övergripande målet med svenskt havsmiljöarbete är att uppnå en god miljö, där havets organismer är välmående och dess resurser kan nyttjas uthålligt av oss människor. Detta förutsätter en riktig beskrivning av miljötillståndet, var störningar förekommer och dess orsaker, för att rätt förvaltningsåtgärder ska genomföras. De miljömål som riksdagen beslutat om är ett viktigt redskap i det arbetet.

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