Contrasted patterns of divergence and gene flow among five fish species in a Mongolian rift lake following glaciation

Roman, Ivana; Bourgeois, Yann; Reyes-Velasco, Jacobo; Jensen, Olaf P.; Waldman, John R.; Boissinot, Stéphane

doi:10.1093/biolinnean/bly083

Cited by 13 publications

(15 citation statements)

References 30 publications

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“…Lake Hovsgol is a large, oligotrophic and ancient (c.a. Lake Hovsgol's ecosystem likely collapsed during the Last Glacial Maximum and the current fish community is hypothesised to have colonised the lake sometime in the last ~13,000 years (Karabanov et al, 2004;Roman et al, 2018). lake located in the Baikal rift zone (Goulden, Tumurtogoo, Karabanov, & Mongontsetseg, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…lake located in the Baikal rift zone (Goulden, Tumurtogoo, Karabanov, & Mongontsetseg, 2006). Lake Hovsgol's ecosystem likely collapsed during the Last Glacial Maximum and the current fish community is hypothesised to have colonised the lake sometime in the last ~13,000 years (Karabanov et al, 2004;Roman et al, 2018). Within Lake Hovsgol, Hovsgol grayling is the only species which is currently found in both the littoral and pelagic zone (Ahrenstorff, Jensen, Weidel, Mendsaikhan, & Hrabik, 2012) and a recent analysis of diet inferred from stable isotopes, suggested the presence of littoral and pelagic foraging groups (Olson, 2014).…”

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confidence: 99%

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Pelagic–littoral resource polymorphism in Hovsgol grayling Thymallus nigrescens from Lake Hovsgol, Mongolia

Olson

Krabbenhoft

Hrabik

et al. 2019

Ecology of Freshwater Fish

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Resource polymorphism is a widespread phenomenon in post-glacial fishes where multiple morphotypes of a species occur sympatrically and exhibit distinct resource use. Availability of open niches and high levels of within and among species competition are thought to drive differences in morphology and may provide insights into early stages of speciation. Hovsgol grayling (Thymallus nigrescens) are endemic to Lake Hovsgol, a lake colonised by fish following the Pleistocene, and are threatened with habitat loss due to climate change and illegal harvest. Previous analysis of Hovsgol grayling diet inferred through C and N stable isotopes suggested the presence of littoral and pelagic foraging groups. We hypothesised that morphology of the two foraging groups would reflect predictions of functional morphology, indicating the presence of resource polymorphism. To test this hypothesis, we evaluated evidence from C and N stable isotopes, stomach contents, fish ages, capture location and morphology. Two foraging groups of Hovsgol grayling were identified through stomach content and C and N stable isotope analysis. Individuals with greater zooplankton consumption were more frequently captured in the pelagic zone, exhibited higher gill raker counts, larger orbit (eye) sizes, longer paired fins, narrower head width, larger maxilla and smaller size at age than the group with greater reliance on benthic invertebrate prey. These differences were generally consistent with those described in other fish species exhibiting littoral-pelagic resource polymorphism.Our study provides the first example of littoral-pelagic resource polymorphism in the salmonid subfamily Thymallinae and highlights the potential influence of competition on fish evolution. K E Y W O R D Sfisheries conservation, functional morphology, Lake Hovsgol, resource polymorphism ACK N OWLED G EM ENTSWe are very grateful to Mfor their assistance with this research. We also thank J. Hoffman for providing his invaluable expertise in stable isotope analysis.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Pelagic–littoral resource polymorphism in Hovsgol grayling Thymallus nigrescens from Lake Hovsgol, Mongolia

Olson

Krabbenhoft

Hrabik

et al. 2019

Ecology of Freshwater Fish

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“…Furthermore, the low migration rates between these habitats may result from particular distribution patterns of burbot at the level of microhabitats in the river, as burbot are restricted to deep and slow moving pools in the river. This leads to a punctuated, unequal distribution along the river's course (Roman et al, ). Such punctuated distributions, due to habitat adaptation, may result in small‐sized burbot in the smaller tributaries of the rivers compared to lake populations where vertical migration is possible.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, the low migration rates between these habitats may result from particular distribution patterns of burbot at the level of microhabitats in the river, as burbot are restricted to deep and slow moving pools in the river. This leads to a punctuated, unequal distribution along the river's course (Roman et al, 2018). (Tables S4 and S5 in Supporting Information S1).…”

Section: Genetic Diversity and Population Structurementioning

confidence: 99%

Genetic diversity and population structure of burbot Lota lota in Germany: Implications for conservation and management

Wetjen

Schmidt

Schrimpf

et al. 2019

Fisheries Management Eco

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The genetic structure of the gadiform fish species, burbot Lota lota L., was investigated across Germany to derive management options for facilitating the preservation of genetic diversity. Sequence analysis of the mitochondrial control region (n = 244) and microsatellite analysis (n = 861) of specimens from 20 sites revealed genetic structuring between major river basins, and particularly between lake and river habitats. The admixture zone between the Eurasian and West European phylogenetic clades in Lake Constance was confirmed and expanded to include the drainage basins of the rivers Rhine and Schlei/Trave. Haplotype distribution and private haplotypes in single river basins indicated population differentiation and imply that German burbot constituted an important part of the entire species' diversity. The derived genetic structuring has implications for future stocking programmes and the preservation of the adaptive potential of burbot, a guiding species for oligotrophic lakes in Europe.

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“…To my knowledge, these methods have not been applied to a multispecies setting in birds. However, studies in other animal groups indicate that these coalescent-based simulators are promising to detect gene flow between several species (Palkopoulou et al 2018;Roman et al 2018). Another modelling approach relies on diffusion models, which use a continuous approximation to the population genetics of a number of individuals evolving in discrete generations.…”

Section: Multispecies Introgressionmentioning

confidence: 99%

Multispecies hybridization in birds

Ottenburghs

2019

Avian Res

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Hybridization is not always limited to two species; often multiple species are interbreeding. In birds, there are numerous examples of species that hybridize with multiple other species. The advent of genomic data provides the opportunity to investigate the ecological and evolutionary consequences of multispecies hybridization. The interactions between several hybridizing species can be depicted as a network in which the interacting species are connected by edges. Such hybrid networks can be used to identify 'hub-species' that interbreed with multiple other species. Avian examples of such 'hub-species' are Common Pheasant (Phasianus colchicus), Mallard (Anas platyrhynchos) and European Herring Gull (Larus argentatus). These networks might lead to the formulation of hypotheses, such as which connections are most likely conducive to interspecific gene flow (i.e. introgression). Hybridization does not necessarily result in introgression. Numerous statistical tests are available to infer interspecific gene flow from genetic data and the majority of these tests can be applied in a multispecies setting. Specifically, model-based approaches and phylogenetic networks are promising in the detection and characterization of multispecies introgression. It remains to be determined how common multispecies introgression in birds is and how often this process fuels adaptive changes. Moreover, the impact of multispecies hybridization on the build-up of reproductive isolation and the architecture of genomic landscapes remains elusive. For example, introgression between certain species might contribute to increased divergence and reproductive isolation between those species and other related species. In the end, a multispecies perspective on hybridization in combination with network approaches will lead to important insights into the history of life on this planet.

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Contrasted patterns of divergence and gene flow among five fish species in a Mongolian rift lake following glaciation

Cited by 13 publications

References 30 publications

Pelagic–littoral resource polymorphism in Hovsgol grayling Thymallus nigrescens from Lake Hovsgol, Mongolia

Pelagic–littoral resource polymorphism in Hovsgol grayling Thymallus nigrescens from Lake Hovsgol, Mongolia

Genetic diversity and population structure of burbot Lota lota in Germany: Implications for conservation and management

Multispecies hybridization in birds

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