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Berggren, H., Nordahl, O., Yildirim, Y., Larsson, P., Tibblin, P. & Forsman, A. (2023). Effects of environmental translocation and host characteristics on skin microbiomes of sun-basking fish. Proceedings of the Royal Society of London. Biological Sciences, 290(2013), Article ID 20231608.
Open this publication in new window or tab >>Effects of environmental translocation and host characteristics on skin microbiomes of sun-basking fish
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2023 (English)In: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 290, no 2013, article id 20231608Article in journal (Refereed) Published
Abstract [en]

Variation in the composition of skin-associated microbiomes has been attributed to host species, geographical location and habitat, but the role of intraspecific phenotypic variation among host individuals remains elusive. We explored if and how host environment and different phenotypic traits were associated with microbiome composition. We conducted repeated sampling of dorsal and ventral skin microbiomes of carp individuals (Cyprinus carpio) before and after translocation from laboratory conditions to a semi-natural environment. Both alpha and beta diversity of skin-associated microbiomes increased substantially within and among individuals following translocation, particularly on dorsal body sites. The variation in microbiome composition among hosts was significantly associated with body site, sun-basking, habitat switch and growth, but not temperature gain while basking, sex, personality nor colour morph. We suggest that the overall increase in the alpha and beta diversity estimates among hosts were induced by individuals expressing greater variation in behaviours and thus exposure to potential colonizers in the pond environment compared with the laboratory. Our results exemplify how biological diversity at one level of organization (phenotypic variation among and within fish host individuals) together with the external environment impacts biological diversity at a higher hierarchical level of organization (richness and composition of fish-associated microbial communities).

Place, publisher, year, edition, pages
Royal Society, 2023
Keywords
freshwater, biodiversity, microbiota, skin microbiome, teleost, 16S amplicons
National Category
Ecology Microbiology
Research subject
Ecology, Microbiology
Identifiers
urn:nbn:se:lnu:diva-126932 (URN)10.1098/rspb.2023.1608 (DOI)001130342600003 ()38113936 (PubMedID)2-s2.0-85180809066 (Scopus ID)
Available from: 2024-01-19 Created: 2024-01-19 Last updated: 2024-02-22Bibliographically approved
Tibblin, P., Bergström, K., Flink, H., Hall, M., Berggren, H., Nordahl, O. & Larsson, P. (2023). Higher abundance of adult pike in Baltic Sea coastal areas adjacent to restored wetlands compared to reference bays. Hydrobiologia, 850, 2049-2060
Open this publication in new window or tab >>Higher abundance of adult pike in Baltic Sea coastal areas adjacent to restored wetlands compared to reference bays
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2023 (English)In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 850, p. 2049-2060Article in journal (Refereed) Published
Abstract [en]

The abundance of pike, a keystone top-predator, have declined dramatically in the Baltic Sea since the 1990s likely owing to recruitment failure. It has been proposed that wetland restoration can aid the recovery of the pike stock by increasing the number of recruits produced by anadromous populations. Yet, no previous studies have addressed whether wetland restorations are associated with higher abundances of adult pike in the coastal habitat. To address this, we performed standardised rod-and-reel survey fishing in paired bays with and without wetlands across three coastal areas and 3 years. To estimate dispersal and the contribution of wetland pike to the coastal stock, we tagged captured pike with passive integrated responders (PIT) and employed PIT reader stations in wetland inlets. The results showed that pike abundances were on average 90% higher in bays with an adjacent wetland although the effect varied among areas. Moreover, PIT-data uncovered that wetland pike constituted a high proportion of the pike found in adjacent coastal habitats and that some wetland fish dispersed up to 10 km. These results support that wetland restoration is a valuable tool to aid the coastal pike stock and ultimately restore the function and services of the coastal ecosystem.

Place, publisher, year, edition, pages
Springer, 2023
Keywords
Conservation, Fish, Habitat restoration, Management, Spawning, Standardized rod-and-reel fishing
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
urn:nbn:se:lnu:diva-121480 (URN)10.1007/s10750-023-05216-4 (DOI)000971781400002 ()2-s2.0-85153063928 (Scopus ID)
Available from: 2023-06-08 Created: 2023-06-08 Last updated: 2023-09-07Bibliographically approved
Sunde, J., Yildirim, Y., Tibblin, P., Bekkevold, D., Skov, C., Nordahl, O., . . . Forsman, A. (2022). Drivers of neutral and adaptive differentiation in pike (Esox lucius) populations from contrasting environments. Molecular Ecology, 31(4), 1093-1110
Open this publication in new window or tab >>Drivers of neutral and adaptive differentiation in pike (Esox lucius) populations from contrasting environments
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2022 (English)In: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 31, no 4, p. 1093-1110Article in journal (Refereed) Published
Abstract [en]

Understanding how eco-evolutionary processes and environmental factors drive population differentiation and adaptation are key challenges in evolutionary biology of relevance for biodiversity protection. Differentiation requires at least partial reproductive separation, which may result from different modes of isolation such as geographic isolation (allopatry) or isolation by distance (IBD), resistance (IBR), and environment (IBE). Despite that multiple modes might jointly influence differentiation, studies that compare the relative contributions are scarce. Using RADseq, we analyse neutral and adaptive genetic diversity and structure in 11 pike (Esox lucius) populations from contrasting environments along a latitudinal gradient (54.9-63.6 degrees N), to investigate the relative effects of IBD, IBE and IBR, and to assess whether the effects differ between neutral and adaptive variation, or across structural levels. Patterns of neutral and adaptive variation differed, probably reflecting that they have been differently affected by stochastic and deterministic processes. The importance of the different modes of isolation differed between neutral and adaptive diversity, yet were consistent across structural levels. Neutral variation was influenced by interactions among all three modes of isolation, with IBR (seascape features) playing a central role, wheares adaptive variation was mainly influenced by IBE (environmental conditions). Taken together, this and previous studies suggest that it is common that multiple modes of isolation interactively shape patterns of genetic variation, and that their relative contributions differ among systems. To enable identification of general patterns and understand how various factors influence the relative contributions, it is important that several modes are simultaneously investigated in additional populations, species and environmental settings.

Place, publisher, year, edition, pages
John Wiley & Sons, 2022
Keywords
adaptation, Esox lucius, genetic differentiation, outlier loci, pike, population structure, RADseq, selection
National Category
Ecology Evolutionary Biology
Research subject
Ecology, Evolutionary Biology
Identifiers
urn:nbn:se:lnu:diva-109463 (URN)10.1111/mec.16315 (DOI)000730288400001 ()34874594 (PubMedID)2-s2.0-85121334285 (Scopus ID)2021 (Local ID)2021 (Archive number)2021 (OAI)
Available from: 2022-01-18 Created: 2022-01-18 Last updated: 2023-02-17Bibliographically approved
Bergström, K., Nordahl, O., Söderling, P., Koch-Schmidt, P., Borger, T., Tibblin, P. & Larsson, P. (2022). Exceptional longevity in northern peripheral populations of Wels catfish (Siluris glanis). Scientific Reports, 12(1), Article ID 8070.
Open this publication in new window or tab >>Exceptional longevity in northern peripheral populations of Wels catfish (Siluris glanis)
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2022 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 12, no 1, article id 8070Article in journal (Refereed) Published
Abstract [en]

Studies of life-history variation across a species range are crucial for ecological understanding and successful conservation. Here, we examined the growth and age of Wels catfish (Silurus glanis) in Sweden, which represent the northernmost populations in Europe. A total of 1183 individuals were captured, marked and released between 2006 and 2020. Mark-recapture data from 162 individuals (size range: 13-195 cm) were used to estimate von Bertalanffy growth curve parameters which revealed very slow growth rates compared to catfish within the core distribution area (central Europe). The fitted von Bertalanffy growth curve predicted a 150 cm catfish to be around 40 years old, while the largest recaptured individual (length 195 cm) was estimated to be 70 (95% CI 50-112) years old. This was substantially older than the previously documented maximum age of a catfish. The weight at length relationships in these northern peripheral populations were similar to those documented for catfish in central Europe indicating that resources did not constrain growth. This indicates that the slow growth and exceptional high age in the northern catfish populations are the result of lower temperatures and/or local adaptations.

Place, publisher, year, edition, pages
Nature Publishing Group, 2022
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
urn:nbn:se:lnu:diva-114322 (URN)10.1038/s41598-022-12165-w (DOI)000796701700022 ()35577886 (PubMedID)2-s2.0-85130182143 (Scopus ID)
Note

Correction published in: Bergström, K., Nordahl, O., Söderling, P. et al. Author Correction: Exceptional longevity in northern peripheral populations of Wels catfish (Siluris glanis). Sci Rep 12, 9812 (2022). https://doi.org/10.1038/s41598-022-14484-4

Available from: 2022-06-17 Created: 2022-06-17 Last updated: 2024-01-17Bibliographically approved
Berggren, H., Tibblin, P., Yildirim, Y., Broman, E., Larsson, P., Lundin, D. & Forsman, A. (2022). Fish Skin Microbiomes Are Highly Variable Among Individuals and Populations but Not Within Individuals. Frontiers in Microbiology, 12, Article ID 767770.
Open this publication in new window or tab >>Fish Skin Microbiomes Are Highly Variable Among Individuals and Populations but Not Within Individuals
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2022 (English)In: Frontiers in Microbiology, E-ISSN 1664-302X, Vol. 12, article id 767770Article in journal (Refereed) Published
Abstract [en]

Fish skin-associated microbial communities are highly variable among populations and species and can impact host fitness. Still, the sources of variation in microbiome composition, and particularly how they vary among and within host individuals, have rarely been investigated. To tackle this issue, we explored patterns of variation in fish skin microbiomes across different spatial scales. We conducted replicate sampling of dorsal and ventral body sites of perch (Perca fluviatilis) from two populations and characterized the variation of fish skin-associated microbial communities with 16S rRNA gene metabarcoding. Results showed a high similarity of microbiome samples taken from the left and right side of the same fish individuals, suggesting that fish skin microbiomes can be reliably assessed and characterized even using a single sample from a specific body site. The microbiome composition of fish skin differed markedly from the bacterioplankton communities in the surrounding water and was highly variable among individuals. No ASV was present in all samples, and the most prevalent phyla, Actinobacteria, Bacteroidetes, and Proteobacteria, varied in relative abundance among fish hosts. Microbiome composition was both individual- and population specific, with most of the variation explained by individual host. At the individual level, we found no diversification in microbiome composition between dorsal and ventral body sites, but the degree of intra-individual heterogeneity varied among individuals. To identify how genetic and phenotypic characteristics of fish hosts impact the rate and nature of intra-individual temporal dynamics of the skin microbiome, and thereby contribute to the host-specific patterns documented here, remains an important task for future research.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2022
Keywords
community ecology, diversity, fish, heterogeneity, repeatability, richness, skin microbiota, spatial variation
National Category
Microbiology Ecology
Research subject
Ecology, Microbiology
Identifiers
urn:nbn:se:lnu:diva-110468 (URN)10.3389/fmicb.2021.767770 (DOI)000751451900001 ()35126324 (PubMedID)2-s2.0-85124103536 (Scopus ID)2022 (Local ID)2022 (Archive number)2022 (OAI)
Available from: 2022-02-17 Created: 2022-02-17 Last updated: 2024-01-17Bibliographically approved
Hall, M., Koch-Schmidt, P., Larsson, P., Tibblin, P., Yildirim, Y. & Sunde, J. (2022). Reproductive homing and fine-scaled genetic structuring of anadromous Baltic Sea perch (Perca fluviatilis). Fisheries Management and Ecology, 29(5), 586-596
Open this publication in new window or tab >>Reproductive homing and fine-scaled genetic structuring of anadromous Baltic Sea perch (Perca fluviatilis)
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2022 (English)In: Fisheries Management and Ecology, ISSN 0969-997X, E-ISSN 1365-2400, Vol. 29, no 5, p. 586-596Article in journal (Refereed) Published
Abstract [en]

To investigate the population dynamics of anadromous Baltic Sea perch Perca fluviatilis (Linnaeus), we studied the migratory behaviour (arrival to spawning location) and population structure (genetic structure and differentiation) of three closely located (<50 km) populations. Spawning migration lasted for 32-80 days, and passive integrated transponder tag (PIT-tag) data indicated that anadromous perch displayed reproductive homing. Populations were differentiated, despite low levels of gene flow (3%-5%), and differentiation increased with increasing geographic distance. This fine-scaled spatial structuring was likely, at least partly, explained by homing behaviour. Analyses of temporal within-stream substructuring yielded inconclusive results, so further studies are required to evaluate this. Taken together, our findings highlight the potential for fine-scaled genetic structuring in anadromous perch and indicate that multiple mechanisms, such as isolation by distance, homing, and reproductive timing could contribute to this pattern. This illustrates the importance of considering cryptic barriers to accurately identify reproductive units, and points to the need for local management of anadromous perch.

Place, publisher, year, edition, pages
John Wiley & Sons, 2022
Keywords
Baltic Sea, differentiation, genetic structure, microsatellites, site fidelity, spawning migration
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
urn:nbn:se:lnu:diva-111230 (URN)10.1111/fme.12542 (DOI)000773603700001 ()2-s2.0-85127291060 (Scopus ID)2022 (Local ID)2022 (Archive number)2022 (OAI)
Available from: 2022-04-08 Created: 2022-04-08 Last updated: 2023-02-21Bibliographically approved
Flink, H., Nordahl, O., Hall, M., Rarysson, A., Bergström, K., Larsson, P., . . . Tibblin, P. (2021). Examining the effects of authentic C&R on the reproductive potential of Northern pike. Fisheries Research, 243, Article ID 106068.
Open this publication in new window or tab >>Examining the effects of authentic C&R on the reproductive potential of Northern pike
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2021 (English)In: Fisheries Research, ISSN 0165-7836, E-ISSN 1872-6763, Vol. 243, article id 106068Article in journal (Refereed) Published
Abstract [en]

The practice within recreational fisheries to release captured fish back to the wild, known as catch-and-release (C&R), is an increasingly important strategy to protect fish stocks from overexploitation. However, C&R is a stressor and since animal reproduction is particularly sensitive to stress there is reason to suspect that such a practice induces sublethal fitness consequences. Here, we investigated whether and how C&R fishing influenced the reproductive potential in an anadromous population of Northern pike (Esox lucius). First, female pike were exposed to authentic C&R using rod-and-reel fishing in a coastal foraging habitat prior to the spawning period. Next, we observed the migration to the freshwater spawning habitat and compared both the timing of arrival and maturity stage between C&R-treated and control individuals. Finally, to evaluate effects on the quality and viability of eggs we stripped captured control and recaptured C&R-treated females, measured egg dry mass to assess nutrient content, conducted artificial fertilisations and incubated eggs in a controlled laboratory experiment. We found no evidence of C&R causing alterations in either arrival time, maturity stage, or the quality and viability of fertilised eggs. In combination, our results suggest that long-term effects of C&R-induced stress on key reproductive traits of pike, if any, are minor.

Place, publisher, year, edition, pages
Elsevier, 2021
Keywords
Angling, Migration, Recreational fishing, Reproduction, Stress
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
urn:nbn:se:lnu:diva-106097 (URN)10.1016/j.fishres.2021.106068 (DOI)000690429400010 ()2-s2.0-85109759648 (Scopus ID)2021 (Local ID)2021 (Archive number)2021 (OAI)
Funder
Swedish Research Council Formas, 2018-00605The Crafoord Foundation, 20190636
Available from: 2021-08-09 Created: 2021-08-09 Last updated: 2023-02-06Bibliographically approved
Fridolfsson, E., Augustsson, A., Forss, J., Larsson, P., Waldenström, J., Witthöft, C. M. & Hylander, S. (2021). Förstudie kring hållbar vattenförsörjning i södra Sverige. Linnéuniverstitetet
Open this publication in new window or tab >>Förstudie kring hållbar vattenförsörjning i södra Sverige
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2021 (Swedish)Report (Other (popular science, discussion, etc.))
Abstract [sv]

Dricksvatten är vårt viktigaste livsmedel men detta rena vatten används även för bevattningsändamål, i vårt avloppssystem och inom industrin. Våra samlade vattenresurser ger dessutom ekosystemtjänster i form av fiske, rekreationsvärde m.m. (Bergek m. fl., 2017). Trots att Sverige är ett mycket vattenrikt land sett ur ett internationellt perspektiv har vattenbrist uppstått i flera delar av landet under senare år. Vidare förväntas pågående och kommande klimatförändringar, befolkningstillväxt och urbanisering påverka vattenkvaliteten negativt samt öka konkurrensen om vatten ytterligare (IPCC, 2014; SMHI, 2020a). Med ökad konkurrens uppstår dessutom målkonflikter mellan olika viktiga samhällsfunktioner. Det finns således ett stort behov av tvärsektoriell forskning samt policyutveckling för att säkerställa en hållbar framtida vattenförsörjning.

Denna rapport syftar till att sammanställa kunskapsläget vad gäller förutsättningarna för en hållbar vattenförsörjning i Kronobergs län. Först beskrivs tillgång och uttag av dricksvatten i Kronoberg i jämförelse med Kalmar och Skåne län samt förutsättningarna för god framtida vattenkvalitet med Bolmen som exempel. Därefter fokuserar vi på de målkonflikter som kan förväntas uppstå kring dricksvattnet och diskuterar slutligen de kunskapsluckor samt det behov av tvärsektoriell forskning och samhällsutveckling som behövs för en hållbar vattenförsörjning.

Place, publisher, year, edition, pages
Linnéuniverstitetet, 2021. p. 17
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-104498 (URN)
Available from: 2021-06-11 Created: 2021-06-11 Last updated: 2023-04-20Bibliographically approved
Hall, M., Nordahl, O., Larsson, P., Forsman, A. & Tibblin, P. (2021). Intra-population variation in reproductive timing covaries with thermal plasticity of offspring performance in perch Perca fluviatilis. Journal of Animal Ecology, 90(10), 2236-2347
Open this publication in new window or tab >>Intra-population variation in reproductive timing covaries with thermal plasticity of offspring performance in perch Perca fluviatilis
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2021 (English)In: Journal of Animal Ecology, ISSN 0021-8790, E-ISSN 1365-2656, Vol. 90, no 10, p. 2236-2347Article in journal (Refereed) Published
Abstract [en]

Life history theory posits that organisms should time their reproduction to coincide with environmental conditions that maximize their fitness. Population-level comparisons have contributed important insights on the adaptive value of reproductive timing and its association to environmental variation. Yet, despite its central role to ecology and evolution, the causes and consequences of variation in reproductive timing among individuals within populations are poorly understood in vertebrates other than birds. Using a combination of observational field studies and a split-brood experiment, we investigated whether differences in breeding time were associated with changes in hatching success, reproductive allocation and reaction norms linking offspring performance to temperature within an anadromous Baltic Sea population of perch Perca fluviatilis. Field observations revealed substantial variation in reproductive timing, with the breeding period lasting almost 2 months and occurring in temperatures ranging from 10 to 21celcius. The hatching success of perch decreased as the reproductive season progressed. At the same time, the reproductive allocation strategy changed over the season, late breeders (the offspring of which were introduced into a high resource environment and increased predation pressure) produced more and smaller eggs that resulted in smaller larvae, compared with early breeders. The split-brood experiment in which eggs were incubated in different temperatures (10, 12, 15, 18 degrees C) showed that differences in reproductive timing were associated with a change in the shape of the reaction norm linking offspring performance to water temperature indicative of adaptive phenotypic plasticity, with the offspring of early breeders performing best in low temperatures and the offspring of late breeders performing best in high temperatures. The seasonal changes in reproductive traits and the shape of the thermal performance suggest time-dependent adaptive differences among individuals within the population. Management actions aimed at preserving and restoring variation in the timing of reproductive events will thus likely also influence variation in associated life history traits and thermal performance curves, which could safeguard populations against environmental challenges and changes associated with exploitation and global warming.

Place, publisher, year, edition, pages
John Wiley & Sons, 2021
Keywords
adaptation by time, adaptive, life history, migration, phenology, phenotypic plasticity, seasonality, spawn
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
urn:nbn:se:lnu:diva-105790 (URN)10.1111/1365-2656.13542 (DOI)000658368300001 ()34028836 (PubMedID)2-s2.0-85107349785 (Scopus ID)2021 (Local ID)2021 (Archive number)2021 (OAI)
Available from: 2021-07-08 Created: 2021-07-08 Last updated: 2023-02-06Bibliographically approved
Jensen, A., Lillie, M., Bergström, K., Larsson, P. & Höglund, J. (2021). Whole genome sequencing reveals high differentiation, low levels of genetic diversity and short runs of homozygosity among Swedish wels catfish. Heredity, 127, 79-91
Open this publication in new window or tab >>Whole genome sequencing reveals high differentiation, low levels of genetic diversity and short runs of homozygosity among Swedish wels catfish
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2021 (English)In: Heredity, ISSN 0018-067X, E-ISSN 1365-2540, Vol. 127, p. 79-91Article in journal (Refereed) Published
Abstract [en]

The use of genetic markers in the context of conservation is largely being outcompeted by whole-genome data. Comparative studies between the two are sparse, and the knowledge about potential effects of this methodology shift is limited. Here, we used whole-genome sequencing data to assess the genetic status of peripheral populations of the wels catfish (Silurus glanis), and discuss the results in light of a recent microsatellite study of the same populations. The Swedish populations of the wels catfish have suffered from severe declines during the last centuries and persists in only a few isolated water systems. Fragmented populations generally are at greater risk of extinction, for example due to loss of genetic diversity, and may thus require conservation actions. We sequenced individuals from the three remaining native populations (Baven, Eman, and Mockeln) and one reintroduced population of admixed origin (Helge a), and found that genetic diversity was highest in Eman but low overall, with strong differentiation among the populations. No signature of recent inbreeding was found, but a considerable number of short runs of homozygosity were present in all populations, likely linked to historically small population sizes and bottleneck events. Genetic substructure within any of the native populations was at best weak. Individuals from the admixed population Helge a shared most genetic ancestry with the Baven population (72%). Our results are largely in agreement with the microsatellite study, and stresses the need to protect these isolated populations at the northern edge of the distribution of the species.

Place, publisher, year, edition, pages
Nature Publishing Group, 2021
National Category
Evolutionary Biology Ecology
Research subject
Ecology, Evolutionary Biology
Identifiers
urn:nbn:se:lnu:diva-103692 (URN)10.1038/s41437-021-00438-5 (DOI)000648225500001 ()33963302 (PubMedID)2-s2.0-85105404758 (Scopus ID)2021 (Local ID)2021 (Archive number)2021 (OAI)
Available from: 2021-06-01 Created: 2021-06-01 Last updated: 2022-02-25Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0344-1939

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