1
|
Hudson CM, Lucek K, Marques DA, Alexander TJ, Moosmann M, Spaak P, Seehausen O, Matthews B. Threespine Stickleback in Lake Constance: The Ecology and Genomic Substrate of a Recent Invasion. Front Ecol Evol 2021. [DOI: 10.3389/fevo.2020.611672] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Invasive species can be powerful models for studying contemporary evolution in natural environments. As invading organisms often encounter new habitats during colonization, they will experience novel selection pressures. Threespine stickleback (Gasterosteus aculeatus complex) have recently colonized large parts of Switzerland and are invasive in Lake Constance. Introduced to several watersheds roughly 150 years ago, they spread across the Swiss Plateau (400–800 m a.s.l.), bringing three divergent hitherto allopatric lineages into secondary contact. As stickleback have colonized a variety of different habitat types during this recent range expansion, the Swiss system is a useful model for studying contemporary evolution with and without secondary contact. For example, in the Lake Constance region there has been rapid phenotypic and genetic divergence between a lake population and some stream populations. There is considerable phenotypic variation within the lake population, with individuals foraging in and occupying littoral, offshore pelagic, and profundal waters, the latter of which is a very unusual habitat for stickleback. Furthermore, adults from the lake population can reach up to three times the size of adults from the surrounding stream populations, and are large by comparison to populations globally. Here, we review the historical origins of the threespine stickleback in Switzerland, and the ecomorphological variation and genomic basis of its invasion in Lake Constance. We also outline the potential ecological impacts of this invasion, and highlight the interest for contemporary evolution studies.
Collapse
|
2
|
Splendiani A, Berrebi P, Tougard C, Righi T, Reynaud N, Fioravanti T, Lo Conte P, Delmastro GB, Baltieri M, Ciuffardi L, Candiotto A, Sabatini A, Caputo Barucchi V. The role of the south-western Alps as a unidirectional corridor for Mediterranean brown trout (Salmo truttacomplex) lineages. Biol J Linn Soc Lond 2020. [DOI: 10.1093/biolinnean/blaa125] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
AbstractThe role of the south-western Alps as a corridor for Mediterranean trout (Salmo trutta complex Linnaeus, 1758) was evaluated in order to understand the influence of the last glacial events in shaping the spatial distribution of the genetic diversity of this salmonid. For this, the allochthonous hypothesis of a man-mediated French origin (19th century) of the Mediterranean trout inhabiting the Po tributaries in the Italian side of the south-western Alps was tested. A total of 412 individuals were analysed at the mitochondrial control region. The phylogenetic classification was carried out by using a Median-Joining Network analysis. Mismatch pair-wise analysis, molecular dating and Kernel density distribution analysis of the main mitochondrial lineages were evaluated to compare past demographic dynamics with the current spatial distribution of genetic diversity. The main outcomes resulted strongly in agreement with a biogeographic scenario where the south-western Alps acted as a unidirectional corridor that permitted the colonization of the upper Durance (Rhône River basin) by trout from the Po River basin. Therefore, the Mediterranean trout should be considered as native also along the Italian side of the south-western Alps and the allochthonous hypothesis should be rejected.
Collapse
Affiliation(s)
- Andrea Splendiani
- Dipartimento di Scienze della Vita e dell’Ambiente, Università Politecnica delle Marche, Ancona, Italy
| | - Patrick Berrebi
- Genome - R&D, Saint-Just, France
- ISEM, Université de Montpellier, CNRS, IRD, EPHE, Montpellier, France
| | | | - Tommaso Righi
- Dipartimento di Scienze della Vita e dell’Ambiente, Università Politecnica delle Marche, Ancona, Italy
| | - Nathalie Reynaud
- ISEM, Université de Montpellier, CNRS, IRD, EPHE, Montpellier, France
| | - Tatiana Fioravanti
- Dipartimento di Scienze della Vita e dell’Ambiente, Università Politecnica delle Marche, Ancona, Italy
| | - Paolo Lo Conte
- Funzione Specializzata Tutela Fauna e Flora, Città Metropolitana di Torino, Torino, Italy
| | - Giovanni B Delmastro
- Laboratorio di Ittiologia e Biol. Acque, Museo Civico di Storia Naturale, Carmagnola, Italy
| | - Marco Baltieri
- ATAAI-Associazione Tutela Ambienti Acquatici e Ittiofauna, Luserna San Giovanni, Italy
| | | | | | - Andrea Sabatini
- Department of Life and Environmental Science, University of Cagliari, Cagliari, Italy
| | - Vincenzo Caputo Barucchi
- Dipartimento di Scienze della Vita e dell’Ambiente, Università Politecnica delle Marche, Ancona, Italy
| |
Collapse
|
3
|
Rieder JM, Vonlanthen P, Seehausen O, Lucek K. Allopatric and sympatric diversification within roach (Rutilus rutilus) of large pre-alpine lakes. J Evol Biol 2019; 32:1174-1185. [PMID: 31257688 DOI: 10.1111/jeb.13502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 06/14/2019] [Accepted: 06/19/2019] [Indexed: 12/19/2022]
Abstract
Intraspecific differentiation in response to divergent natural selection between environments is a common phenomenon in some northern freshwater fishes, especially salmonids and stickleback. Understanding why these taxa diversify and undergo adaptive radiations while most other fish species in the same environments do not, remains an open question. The possibility for intraspecific diversification has rarely been evaluated for most northern freshwater fish species. Here, we assess the potential for intraspecific differentiation between and within lake populations of roach (Rutilus rutilus)-a widespread and abundant cyprinid species-in lakes in which salmonids have evolved endemic adaptive radiations. Based on more than 3,000 polymorphic RADseq markers, we detected low but significant genetic differentiation between roach populations of two ultraoligotrophic lakes and between these and populations from other lakes. This, together with differentiation in head morphology and stable isotope signatures, suggests evolutionary and ecological differentiation among some of our studied populations. Next, we tested for intralacustrine diversification of roach within Lake Brienz, the most pristine lake surveyed in this study. We found significant phenotypic evidence for ecological intralacustrine differentiation between roach caught over a muddy substrate and those caught over a rocky substrate. However, evidence for intralacustrine genetic differentiation is at best subtle and phenotypic changes may therefore be mostly plastic. Overall, our findings suggest roach can differ between ecologically distinct lakes, but the extent of intralacustrine ecological differentiation is weak, which contrasts with the strong differentiation among endemic species of whitefish in the same lakes.
Collapse
Affiliation(s)
- Jessica M Rieder
- Division of Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland.,Eawag Swiss Federal Institute of Aquatic Science and Technology, Department of Fish Ecology and Evolution, Center of Ecology, Evolution, and Biogeochemistry, Kastanienbaum, Switzerland.,Centre for Fish and Wildlife Health, Department of Infectious Diseases and Pathobiology, University of Bern, Bern, Switzerland
| | - Pascal Vonlanthen
- Division of Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland.,Eawag Swiss Federal Institute of Aquatic Science and Technology, Department of Fish Ecology and Evolution, Center of Ecology, Evolution, and Biogeochemistry, Kastanienbaum, Switzerland.,Aquabios GmbH, Cordast, Switzerland
| | - Ole Seehausen
- Division of Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland.,Eawag Swiss Federal Institute of Aquatic Science and Technology, Department of Fish Ecology and Evolution, Center of Ecology, Evolution, and Biogeochemistry, Kastanienbaum, Switzerland
| | - Kay Lucek
- Division of Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland.,Eawag Swiss Federal Institute of Aquatic Science and Technology, Department of Fish Ecology and Evolution, Center of Ecology, Evolution, and Biogeochemistry, Kastanienbaum, Switzerland.,Department of Environmental Sciences, University of Basel, Basel, Switzerland
| |
Collapse
|
4
|
Corral‐Lou A, Perea S, Aparicio E, Doadrio I. Phylogeography and species delineation of the genusPhoxinusRafinesque, 1820 (Actinopterygii: Leuciscidae) in the Iberian Peninsula. J ZOOL SYST EVOL RES 2019. [DOI: 10.1111/jzs.12320] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Andrea Corral‐Lou
- Biodiversity and Evolutionary Biology Department Museo Nacional de Ciencias Naturales, CSIC Madrid Spain
| | - Silvia Perea
- Biodiversity and Evolutionary Biology Department Museo Nacional de Ciencias Naturales, CSIC Madrid Spain
| | - Enric Aparicio
- Institute of Aquatic Ecology University of Girona Girona Spain
| | - Ignacio Doadrio
- Biodiversity and Evolutionary Biology Department Museo Nacional de Ciencias Naturales, CSIC Madrid Spain
| |
Collapse
|
5
|
Lucek K, Keller I, Nolte AW, Seehausen O. Distinct colonization waves underlie the diversification of the freshwater sculpin (Cottus gobio
) in the Central European Alpine region. J Evol Biol 2018; 31:1254-1267. [DOI: 10.1111/jeb.13339] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 06/07/2018] [Accepted: 06/19/2018] [Indexed: 12/30/2022]
Affiliation(s)
- Kay Lucek
- Department of Environmental Sciences; University of Basel; Basel Switzerland
- Department of Aquatic Ecology and Macroevolution; Institute of Ecology and Evolution; University of Bern; Bern Switzerland
- Department of Fish Ecology and Evolution; EAWAG Swiss Federal Institute of Aquatic Science and Technology; Center of Ecology, Evolution and Biochemistry; Kastanienbaum Switzerland
| | - Irene Keller
- Department of BioMedical Research and Swiss Institute of Bioinformatics; University of Bern; Bern Switzerland
| | - Arne W. Nolte
- Institute for Biology; Carl von Ossietzky University Oldenburg; Oldenburg Germany
- Department for Evolutionary Genetics; Max-Planck Institute for Evolutionary Biology; Plön Germany
| | - Ole Seehausen
- Department of Aquatic Ecology and Macroevolution; Institute of Ecology and Evolution; University of Bern; Bern Switzerland
- Department of Fish Ecology and Evolution; EAWAG Swiss Federal Institute of Aquatic Science and Technology; Center of Ecology, Evolution and Biochemistry; Kastanienbaum Switzerland
| |
Collapse
|
6
|
Genetic characterization of Western European noble crayfish populations (Astacus astacus) for advanced conservation management strategies. CONSERV GENET 2017. [DOI: 10.1007/s10592-017-0981-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
7
|
Homola JJ, Ruetz CR, Kohler SL, Thum RA. Complex postglacial recolonization inferred from population genetic structure of mottled sculpin Cottus bairdii in tributaries of eastern Lake Michigan, U.S.A. JOURNAL OF FISH BIOLOGY 2016; 89:2234-2250. [PMID: 27616022 DOI: 10.1111/jfb.13101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Accepted: 06/27/2016] [Indexed: 06/06/2023]
Abstract
This study used analyses of the genetic structure of a non-game fish species, the mottled sculpin Cottus bairdii to hypothesize probable recolonization routes used by cottids and possibly other Laurentian Great Lakes fishes following glacial recession. Based on samples from 16 small streams in five major Lake Michigan, U.S.A., tributary basins, significant interpopulation differentiation was documented (overall FST = 0·235). Differentiation was complex, however, with unexpectedly high genetic similarity among basins as well as occasionally strong differentiation within basins, despite relatively close geographic proximity of populations. Genetic dissimilarities were identified between eastern and western populations within river basins, with similarities existing between eastern and western populations across basins. Given such patterns, recolonization is hypothesized to have occurred on three occasions from more than one glacial refugium, with a secondary vicariant event resulting from reduction in the water level of ancestral Lake Michigan. By studying the phylogeography of a small, non-game fish species, this study provides insight into recolonization dynamics of the region that could be difficult to infer from game species that are often broadly dispersed by humans.
Collapse
Affiliation(s)
- J J Homola
- Robert B. Annis Water Resources Institute, Grand Valley State University, 740 W. Shoreline Drive, Muskegon, MI, 49441, U.S.A..
| | - C R Ruetz
- Robert B. Annis Water Resources Institute, Grand Valley State University, 740 W. Shoreline Drive, Muskegon, MI, 49441, U.S.A
| | - S L Kohler
- Department of Biological Sciences and Environmental and Sustainability Studies Program, Western Michigan University, Kalamazoo, MI, 49008, U.S.A
| | - R A Thum
- Department of Plant Sciences & Plant Pathology, Montana State University, P. O. Box 173150, Bozeman, MT, 59717, U.S.A
| |
Collapse
|
8
|
Gouskov A, Vorburger C. Postglacial recolonizations, watershed crossings and human translocations shape the distribution of chub lineages around the Swiss Alps. BMC Evol Biol 2016; 16:185. [PMID: 27612944 PMCID: PMC5017123 DOI: 10.1186/s12862-016-0750-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 08/19/2016] [Indexed: 11/25/2022] Open
Abstract
Background Distributions of European fish species were shaped by glaciations and the geological history of river networks until human activities partially abrogated the restrictions of biogeographical regions. The nearby origins of the Rhine, Rhone, Danube and Po rivers in the Swiss Alps allow the examination of historical and human-influenced patterns in fish genetic structure over a small geographic scale. We investigated these patterns in the widespread European chub (Squalius cephalus) from the Rhone, Rhine and Danube catchments and its proposed southern sister species Italian chub (Squalius squalus) from the Po catchment. Results A phylogenetic tree constructed from mitochondrial Cytochrome b and COI sequences was consistent with earlier work in that it showed a separation of European chub and Italian chub, which was also reflected in microsatellite allele frequencies, morphological traits and shape differences quantified by geometric morphometrics. A new finding was that the predominant mitochondrial haplotype of European chub from the Rhine and Rhone catchments was also discovered in some individuals from Swiss populations of the Italian chub, presumably as a result of human translocation. Consistent with postglacial recolonizations from multiple refugia along the major rivers, the nuclear genetic structure of the European chub largely reflected drainage structure, but it was modified by watershed crossings between Rhine and Rhone near Lake Geneva as well as between Danube and Rhine near Lake Constance. Conclusion Our study adds new insights into the cyprinid colonization history of central Europe by showing that multiple processes shaped the distribution of different chub lineages around the Swiss Alps. Interestingly, we find evidence that cross-catchment migration has been mediated by unusual geological events such as drainage captures or watershed crossings facilitated by retreating glaciers, as well as evidence that human transport has interfered with the historical distribution of these fish (European chub haplotypes present in the Italian chub). The desirable preservation of evolutionarily distinct lineages will thus require the prevention of further translocations. Electronic supplementary material The online version of this article (doi:10.1186/s12862-016-0750-9) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Alexandre Gouskov
- Eawag, Aquatic Ecology Department, Überlandstrasse 133, P.O.Box 611, 8600, Dübendorf, Switzerland.,Institute of Integrative Biology, ETH Zürich, Universitätstrasse 16, 8092, Zürich, Switzerland
| | - Christoph Vorburger
- Eawag, Aquatic Ecology Department, Überlandstrasse 133, P.O.Box 611, 8600, Dübendorf, Switzerland. .,Institute of Integrative Biology, ETH Zürich, Universitätstrasse 16, 8092, Zürich, Switzerland.
| |
Collapse
|
9
|
Population structure, inbreeding and local adaptation within an endangered riverine specialist: the nase (Chondrostoma nasus). CONSERV GENET 2014. [DOI: 10.1007/s10592-014-0590-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
10
|
Dubut V, Fouquet A, Voisin A, Costedoat C, Chappaz R, Gilles A. From Late Miocene to Holocene: processes of differentiation within the Telestes genus (Actinopterygii: Cyprinidae). PLoS One 2012; 7:e34423. [PMID: 22479629 PMCID: PMC3315529 DOI: 10.1371/journal.pone.0034423] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Accepted: 02/28/2012] [Indexed: 11/23/2022] Open
Abstract
Investigating processes and timing of differentiation of organisms is critical in the understanding of the evolutionary mechanisms involved in microevolution, speciation, and macroevolution that generated the extant biodiversity. From this perspective, the Telestes genus is of special interest: the Telestes species have a wide distribution range across Europe (from the Danubian district to Mediterranean districts) and have not been prone to translocation. Molecular data (mtDNA: 1,232 bp including the entire Cyt b gene; nuclear genome: 11 microsatellites) were gathered from 34 populations of the Telestes genus, almost encompassing the entire geographic range. Using several phylogenetic and molecular dating methods interpreted in conjunction with paleoclimatic and geomorphologic evidence, we investigated the processes and timing of differentiation of the Telestes lineages. The observed genetic structure and diversity were largely congruent between mtDNA and microsatellites. The Messinian Salinity Crisis (Late Miocene) seems to have played a major role in the speciation processes of the genus. Focusing on T. souffia, a species occurring in the Danube and Rhone drainages, we were able to point out several specific events from the Pleistocene to the Holocene that have likely driven the differentiation and the historical demography of this taxon. This study provides support for an evolutionary history of dispersal and vicariance with unprecedented resolution for any freshwater fish in this region.
Collapse
Affiliation(s)
- Vincent Dubut
- Aix-Marseille Université, CNRS, IRD, UMR 7263-IMBE, Equipe Evolution Génome Environnement, Centre Saint-Charles, Case 36, Marseille, France.
| | | | | | | | | | | |
Collapse
|
11
|
River fragmentation increases localized population genetic structure and enhances asymmetry of dispersal in bullhead (Cottus gobio). CONSERV GENET 2012. [DOI: 10.1007/s10592-011-0306-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
12
|
Westram AM, Jokela J, Baumgartner C, Keller I. Spatial distribution of cryptic species diversity in european freshwater amphipods (Gammarus fossarum) as revealed by pyrosequencing. PLoS One 2011; 6:e23879. [PMID: 21909373 PMCID: PMC3166083 DOI: 10.1371/journal.pone.0023879] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Accepted: 07/26/2011] [Indexed: 12/04/2022] Open
Abstract
In order to understand and protect ecosystems, local gene pools need to be evaluated with respect to their uniqueness. Cryptic species present a challenge in this context because their presence, if unrecognized, may lead to serious misjudgement of the distribution of evolutionarily distinct genetic entities. In this study, we describe the current geographical distribution of cryptic species of the ecologically important stream amphipod Gammarus fossarum (types A, B and C). We use a novel pyrosequencing assay for molecular species identification and survey 62 populations in Switzerland, plus several populations in Germany and eastern France. In addition, we compile data from previous publications (mainly Germany). A clear transition is observed from type A in the east (Danube and Po drainages) to types B and, more rarely, C in the west (Meuse, Rhone, and four smaller French river systems). Within the Rhine drainage, the cryptic species meet in a contact zone which spans the entire G. fossarum distribution range from north to south. This large-scale geographical sorting indicates that types A and B persisted in separate refugia during Pleistocene glaciations. Within the contact zone, the species rarely co-occur at the same site, suggesting that ecological processes may preclude long-term coexistence. The clear phylogeographical signal observed in this study implies that, in many parts of Europe, only one of the cryptic species is present.
Collapse
Affiliation(s)
- Anja Marie Westram
- Aquatic Ecology, Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland.
| | | | | | | |
Collapse
|
13
|
Joannon B, Lavigne C, Lecoq H, Desbiez C. Barriers to gene flow between emerging populations of Watermelon mosaic virus in Southeastern France. PHYTOPATHOLOGY 2010; 100:1373-1379. [PMID: 20879843 DOI: 10.1094/phyto-04-10-0118] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Since 1999, "emerging" (EM) strains of Watermelon mosaic virus (WMV) have been detected in cucurbit crops of southeastern France, probably as a result of recent introductions. Population genetic approaches were used to study the structure of EM isolates in southeastern France and to identify factors involved in their spatial distribution. A population clustering method (SAMOVA) and a maximum-difference algorithm (Monmonier's algorithm) were combined to visualize and quantify barriers to gene flow between populations. Both methods yielded similar results and two main barriers were identified. A North/South oriented barrier may be related to physical obstacles to gene flow (Rhône River, presence of an area with few cucurbit crops). Although the barrier was very strong, some "crossing" events were detected. A second barrier, oriented Northwest to Southeast, was not correlated with obvious geographical features. The two methods used here are complementary and confirm the limited spread of WMV-EM isolates. This approach can be useful in epidemiology studies to characterize the structure of viral populations and identify barriers to gene flow.
Collapse
Affiliation(s)
- B Joannon
- INRA, Unité de Pathologie Vététale UR407, F-84140 Montfavet, France
| | | | | | | |
Collapse
|
14
|
SHIKANO TAKAHITO, SHIMADA YUKINORI, HERCZEG GÁBOR, MERILÄ JUHA. History vs. habitat type: explaining the genetic structure of European nine-spined stickleback (Pungitius pungitius) populations. Mol Ecol 2010; 19:1147-61. [DOI: 10.1111/j.1365-294x.2010.04553.x] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
15
|
Neuenschwander S, Largiadèr CR, Ray N, Currat M, Vonlanthen P, Excoffier L. Colonization history of the Swiss Rhine basin by the bullhead (Cottus gobio): inference under a Bayesian spatially explicit framework. Mol Ecol 2008; 17:757-72. [PMID: 18194169 DOI: 10.1111/j.1365-294x.2007.03621.x] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The present distribution of freshwater fish in the Alpine region has been strongly affected by colonization events occurring after the last glacial maximum (LGM), some 20,000 years ago. We use here a spatially explicit simulation framework to model and better understand their colonization dynamics in the Swiss Rhine basin. This approach is applied to the European bullhead (Cottus gobio), which is an ideal model organism to study fish past demographic processes since it has not been managed by humans. The molecular diversity of eight sampled populations is simulated and compared to observed data at six microsatellite loci under an approximate Bayesian computation framework to estimate the parameters of the colonization process. Our demographic estimates fit well with current knowledge about the biology of this species, but they suggest that the Swiss Rhine basin was colonized very recently, after the Younger Dryas some 6600 years ago. We discuss the implication of this result, as well as the strengths and limits of the spatially explicit approach coupled to the approximate Bayesian computation framework.
Collapse
Affiliation(s)
- Samuel Neuenschwander
- CMPG, Zoological Institute, University of Bern, Baltzerstrasse 6, 3012 Bern, Switzerland.
| | | | | | | | | | | |
Collapse
|