Article
Marine & Freshwater Biology
Zivile Jurgelene, Danguole Montvydiene, Saulius Stakenas, Justas Poviliunas, Simonas Rackauskas, Ricardas Taraskevicius, Vesta Skrodenyte-Arbaciauskiene, Nijole Kazlauskiene
Summary: This study investigates the effects of different brands of alizarin dye on fish health and finds significant differences between brands. The results demonstrate that the toxicity of the dye varies depending on its concentration and the developmental stage of the fish.
AQUATIC TOXICOLOGY
(2022)
Article
Fisheries
Gasper Renko, Ida Djurdjevic, Simona Susnik Bajec
Summary: A novel protocol for the isolation of chromatophores from brown trout skin was developed based on previous research on zebrafish, enabling specific gene expression evaluation. The method is simple, fast, and ethical, allowing for monitoring at multiple time points, and should be effective for the majority of salmonid species due to similarities in skin morphology.
Article
Fisheries
Theo Valette, Maeva Leitwein, Jean-Marc Lascaux, Erick Desmarais, Patrick Berrebi, Bruno Guinand
Summary: The study used GWAS and redundancy analysis to explore the molecular basis of pigmentation variation in brown trout. They identified 337 independent loci associated with pigmentation traits, which mapped to 35 linkage groups and were related to 218 candidate genes. The findings suggest a polygenic genomic architecture of pigmentation in brown trout.
JOURNAL OF FISH BIOLOGY
(2023)
Article
Ecology
Teppo Vehanen, Ari Huusko, Eva Bergman, Asa Enefalk, Pauliina Louhi, Tapio Sutela
Summary: Predator-prey interactions play a significant role in influencing the structure of fish communities. Hatchery fish are more vulnerable to predation compared to wild counterparts, especially as their body size increases. Increasing habitat heterogeneity can reduce predation rate in streams with mammalian predators, highlighting the importance of considering habitat diversity in management decisions for supporting wild fish populations.
FRESHWATER BIOLOGY
(2022)
Article
Environmental Sciences
Daniel Eisendle, Nikolaus Medgyesy, Georg H. Niedrist, Martin J. Kainz, Ruben Sommaruga
Summary: The introduction of allopatric Salmo trutta into mountain lakes has led to changes in the food web, with the most important prey items being planktonic and benthic sources, especially chironomid larvae. Airborne terrestrial insects were the main stomach content during the ice-free period, but their values did not match up with fish, suggesting a minor role for fish nutrition. Copepods were relevant as fish diet only during the ice-covered period. This study provides valuable information for future reintroduction efforts and highlights the decreased lake-to-land resource transfer due to the introduction of this fish species.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Biodiversity Conservation
Oksana Burimski, Anti Vasemagi, Riho Gross
Summary: This study characterized the population genetic structure and temporal variability of four Estonian sea trout populations and found that hatchery releases have influenced the genetic diversity and structuring of these populations. However, the impact of hatchery releases on the adaptive variation and fitness-related traits in wild trout populations requires further investigation. This study demonstrates the dynamic nature of sea trout population genetic structure and emphasizes the importance of long-term genetic monitoring for management and conservation.
CONSERVATION GENETICS
(2023)
Article
Multidisciplinary Sciences
Rafal Bernas, Anna Was-Barcz, Mariann Arnyasi, Piotr Debowski, Grzegorz Radtke, Anita Pocwierz-Kotus, Patrick Berrebi
Summary: Selection, genetic drift, and gene flow affect genetic variation within populations and genetic differences among populations. In brown trout populations, disrupted river-segment connectivity is the main factor affecting population fragmentation. The study found a complex pattern of gene flow between resident and migratory brown trout, with isolated resident specimens sharing spawning grounds with sea trout downstream of impassable barriers.
SCIENTIFIC REPORTS
(2021)
Article
Biochemistry & Molecular Biology
Atal Saha, Anastasia Andersson, Sara Kurland, Naomi L. P. Keehnen, Verena E. Kutschera, Ola Hossjer, Diana Ekman, Sten Karlsson, Marty Kardos, Gunnar Stahl, Fred W. Allendorf, Nils Ryman, Linda Laikre
Summary: The coexistence of genetically distinguishable populations of the same species in the same ecological area is a puzzle in ecology. Research on sympatric brown trout populations in small Lakes Bunnersjoarna, Sweden, reveals genetic divergence and different degrees of isolation between the two coexisting demes, driven by genetic drift and diversifying selection. The study highlights the importance of considering hidden biodiversity in conservation management.
Article
Fisheries
Joelle Chat, Amaia Lamarins, Olivier Lepais
Summary: This study investigates the migration and spatial distribution of sea trout in brown trout populations. The results show that the straying rate of non-local sea trout decreases non-linearly as distance from the coast increases, and this spatial pattern is consistent across the three rivers studied.
JOURNAL OF FISH BIOLOGY
(2022)
Article
Fisheries
Matti Janhunen, Nico Alioravainen, Teuvo Niva
Summary: This study investigated the impact of stocking programs on the migration behavior of brown trout. The results showed that brown trout native to River Juutuanjoki were more likely to return to their birthplace for spawning compared to trout from neighboring rivers. The release area had a minimal effect on the migration behavior of the stocked fish.
FISHERIES RESEARCH
(2023)
Article
Fisheries
R. Andrew King, Andrew L. Miller, Jamie R. Stevens
Summary: This study investigates the contribution of a stocking programme to sea trout population in the Shetland Islands, and found that despite extensive stocking, wild spawned brown trout still dominated, indicating a very limited impact of stocking. The revival of sea trout numbers appears to be driven almost exclusively by recovery of trout spawned in the wild.
JOURNAL OF FISH BIOLOGY
(2021)
Article
Fisheries
Adam M. Lejk, Grzegorz Radtke
Summary: The study compared basic biological parameters of marked and unmarked lake-migratory brown trout juveniles and found no significant differences between the two groups in three consecutive seasons. However, notable differences in overall condition and survival of juveniles between seasons were observed, likely due to streambed regulation. Variations in specific growth rate may be affected by the size of fish before stocking, providing assumptions for restocking and recovery activities.
FISHERIES RESEARCH
(2021)
Article
Environmental Sciences
Daniel Palm, James Losee, Susanna Andersson, Gustav Hellstroem, Annika Holmgren, Goran Spong
Summary: Stocking of eggs is a common strategy for supporting declining or reintroducing extinct salmonid populations. This study measured the dispersal distance of brown trout fry in a low gradient stream in Sweden. The majority of fry dispersed downstream and stayed within 200 m from the stocking point, with no difference based on fry size or the presence of competing cohorts. Genetic influence on dispersal distances was not observed. The study suggests that stocking points should be separated by approximately 330 m to avoid habitat overlap between fry from different stocking points.
RIVER RESEARCH AND APPLICATIONS
(2023)
Article
Fisheries
Marcin Kucinski, Jacek Kozlowski, Krzysztof Kozlowski, Piotr Dynowski, Dorota Fopp-Bayat, Konrad Ocalewicz
Summary: The study on genetic diversity and structure of brown trout in Tatra National Park revealed a moderate level of genetic diversity and low genetic differentiation. Bayesian skyline plot indicated stable population size with evidence of historical decline. mtDNA analysis showed weak genetic clustering with no clear geographical pattern in haplotype frequencies.
TURKISH JOURNAL OF FISHERIES AND AQUATIC SCIENCES
(2021)
Article
Environmental Sciences
Jerome G. Prunier, Keoni Saint-Pe, Laurence Tissot, Nicolas Poulet, Geoffrey Marselli, Charlotte Veyssiere, Simon Blanchet
Summary: Intraspecific genetic diversity shows repeatable spatial patterns in natural landscapes, which can be modified by human activities. Stocking natural populations with captive-bred strains strongly alters the genetic diversity and differentiation patterns in brown trout populations. This study documents the spatial distribution of captive-bred ancestry in French brown trout populations and quantifies the effect of captive-bred ancestry on the spatial distribution of genetic diversity and differentiation.
AQUATIC CONSERVATION-MARINE AND FRESHWATER ECOSYSTEMS
(2022)
Article
Fisheries
Rikke P. A. Madsen, Magnus W. Jacobsen, Kathleen G. O'Malley, Rasmus Nygaard, Kim Praebel, Bjarni Jonsson, Jose M. Pujolar, Dylan J. Fraser, Louis Bernatchez, Michael M. Hansen
ECOLOGY OF FRESHWATER FISH
(2020)
Review
Evolutionary Biology
Eva Egelyng Sigsgaard, Mads Reinholdt Jensen, Inger Eleanor Winkelmann, Peter Rask Moller, Michael Moller Hansen, Philip Francis Thomsen
EVOLUTIONARY APPLICATIONS
(2020)
Article
Biochemistry & Molecular Biology
Mads Reinholdt Jensen, Eva Egelyng Sigsgaard, Shenglin Liu, Andrea Manica, Steffen Sanvig Bach, Michael Moller Hansen, Peter Rask Moller, Philip Francis Thomsen
Summary: The study developed target capture probes for whale shark eDNA sampling, successfully retrieving complete mitochondrial genomes and numerous nuclear loci from aquatic samples. Careful probe design and consideration of target and nontarget sequences are crucial for efficient extraction of population genomic data.
MOLECULAR ECOLOGY RESOURCES
(2021)
Article
Ecology
Maciej Szewczyk, Carsten Nowak, Pavel Hulva, Joachim Mergeay, Astrid Stronen, Barbora Cerna Bolfikova, Sylwia D. Czarnomska, Tom A. Diserens, Viktar Fenchuk, Michal Figura, Arjen de Groot, Andzelika Haidt, Michael M. Hansen, Hugh Jansman, Gesa Kluth, Iga Kwiatkowska, Karolina Lubinska, Johan R. Michaux, Natalia Niedzwiecka, Sabina Nowak, Kent Olsen, Ilka Reinhardt, Maciej Romanski, Laurent Schley, Steve Smith, Renata Spinkyte-Backaitien, Przemyslaw Stachyra, Kinga M. Stepniak, Peter Sunde, Philip F. Thomsen, Tomasz Zwijacz-Kozica, Robert W. Myslajek
Summary: The gray wolf range in central Europe is expanding, reconnecting previously isolated populations. Despite representing the same phylogeographic lineage, recent genetic findings show significant genetic structure between CE and Baltic wolf populations.
Letter
Biodiversity Conservation
Peter Sunde, Sebastian Collet, Carsten Nowak, Philip Francis Thomsen, Michael Moller Hansen, Bjoern Schulz, Jens Matzen, Frank-Uwe Michler, Christina Vedel-Smith, Kent Olsen
Summary: The study shows that large carnivores are recolonizing Europe due to legal protection, but their population expansion may be limited by increased mortality in landscapes highly impacted by humans. In the Jutland peninsula, wolves are facing high mortality rates primarily driven by cryptic causes, likely illegal killing.
CONSERVATION LETTERS
(2021)
Article
Fisheries
Magnus W. Jacobsen, Nana W. Jensen, Rasmus Nygaard, Kim Praebel, Bjarni Jonsson, Nynne Hjort Nielsen, Jose M. Pujolar, Dylan J. Fraser, Louis Bernatchez, Michael M. Hansen
Summary: This study analysed the mitochondrial genomes of different populations of Arctic char, revealing the phylogeographic relationships between different lineages and potential refugia and colonisation routes. The study found a secondary contact zone between Arctic and Atlantic evolutionary lineages in western Greenland, estimated the divergence time of lineages and the time of the most recent common ancestor, and suggested a complex history involving cryptic refugia or multiple recolonisations.
ECOLOGY OF FRESHWATER FISH
(2022)
Article
Plant Sciences
Diana L. A. Vasquez, Michael Moller Hansen, Henrik Balslev, Roswitha Schmickl
Summary: This study explores the impact of Pleistocene climate change on intraspecific gene flow and genetic variation patterns in high-elevation plant populations in the Andes. The findings suggest that genetic differentiation within species is mainly shaped by periods of geographic isolation, restricted gene flow, and genetic drift, despite periods of increased connectivity and gene flow.
Article
Ecology
Martin Mayer, Kent Olsen, Bjoern Schulz, Jens Matzen, Carsten Nowak, Philip Francis Thomsen, Michael Moller Hansen, Christina Vedel-Smith, Peter Sunde
Summary: Attacks by large predators on livestock drive conflicts. Understanding predator distribution, livestock depredation locations, and influencing factors can help mitigate conflicts. This study found that wolves primarily kill livestock in agricultural areas with low availability of wild ungulate prey and high livestock densities, rather than due to behavioral preferences for sheep. Improving fences in established wolf territories can reduce attacks, but livestock depredation by non-resident wolves in agricultural areas presents a greater challenge.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2022)
Article
Biochemistry & Molecular Biology
Halvor Knutsen, Diana Catarino, Lauren Rogers, Marte Sodeland, Morten Mattingsdal, Marlene Jahnke, Jeffrey A. Hutchings, Ida Mellerud, Sigurd H. Espeland, Kerstin Johanneson, Olivia Roth, Michael M. Hansen, Sissel Jentoft, Carl Andre, Per Erik Jorde
Summary: Gene flow has a significant impact on spatial genetic structure and local adaptation. The presence or absence of a pelagic larval stage and the spatial distribution of suitable habitats play important roles in shaping gene flow and the genetic structure of populations. This study used whole genome sequencing and reduced representation sequencing data to analyze the genetic structure of the broadnosed pipefish. The findings revealed changes in population connectivity and were compared to two other fish species with a pelagic larval stage.
Review
Biology
Bror Jonsson, Nina Jonsson, Michael M. Hansen
Summary: Environmental factors during embryogenesis can have knock-on effects on offspring in later life stages. This article discusses how temperature and predator cues can influence phenotypes in fish, amphibians, and reptiles, with reptiles being particularly well-described. These effects are common among ectotherms, as most oviparous species have their eggs incubated outside the mother's body, exposing them to varied and changing environmental conditions. Developmental plasticity helps offspring cope with potential influences they may encounter later in life, such as habitat temperature and safety.
QUARTERLY REVIEW OF BIOLOGY
(2022)
Article
Biodiversity Conservation
Xiu Feng, Shenglin Liu, Michael M. Hansen
Summary: European and American eel are catadromous fish species that have experienced recent population declines. The demographic histories of both species show ancient declines and stable periods, with possible environmental factors including ocean current changes and geomagnetism reversal.
CONSERVATION GENETICS
(2022)
Article
Biochemistry & Molecular Biology
Shenglin Liu, Aja Noersgaard Buur Tengstedt, Magnus W. Jacobsen, Jose Martin Pujolar, Bjarni Jonsson, Javier Lobon-Cervia, Louis Bernatchez, Michael M. Hansen
Summary: This study analyzed genetic and methylation variation in European eels and found that methylation plays an important role in the life cycle of eels, potentially mediating interactions between local environments, development, and phenotypic variation for adaptation. The study also highlighted the significant role of methylation at Hox genes for adaptive processes.
Article
Biochemistry & Molecular Biology
Xiu Feng, Shenglin Liu, Xiaoyun Sui, Yifeng Chen, Ren Zhu, Yintao Jia, Jingou Tong, Xiaomu Yu, Chunlong Liu, Michael M. Hansen
Summary: Anthropogenic biological invasions are important concerns for studying rapid evolutionary changes and adaptation to novel environments. The goldfish Carassius auratus, with both sexual diploids and unisexual triploids, provides an ideal model to study invasion processes in different reproductive forms. Using whole-genome resequencing data, we found that invasive diploids experienced a loss of individual genetic diversity due to recent inbreeding and founder events, while invasive triploids maintained genetic diversity through their reproduction mode of gynogenesis. Regions of putative selective sweeps between invasive and source populations mainly involved genes associated with mannosidase activity and embryo development.
Editorial Material
Genetics & Heredity
Michael M. Hansen
TRENDS IN GENETICS
(2023)
Article
Ecology
Eloise Duval, Oystein Skaala, Maria Quintela, Geir Dahle, Aurelien Delaval, Vidar Wennevik, Kevin A. Glover, Michael M. Hansen
Summary: The study found a stable but decreased population of anadromous spawners after an initial decline. The significant association between kinship and migration timing in smolts suggests that specific mortality episodes in the sea could disproportionately affect certain families and reduce the overall effective population size. Furthermore, the results based on parentage assignment demonstrate the strong buffering effect of resident trout in case of elevated marine mortality affecting anadromous trout, but also highlight the potential decrease in overall production due to increased mortality of anadromous trout, majority of which are females.
BMC ECOLOGY AND EVOLUTION
(2021)