Genetic and phenotypic variation among <i>Galaxias maculatus</i> populations reflects contrasting landscape effects between northern and southern Patagonia

Carrea, Cecilia; Cussac, Víctor E.; Ruzzante, Daniel E.

doi:10.1111/fwb.12036

Cited by 24 publications

(28 citation statements)

References 69 publications

(101 reference statements)

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“…It also often left a genomic signature in populations (Hänfling et al, 2002) because their glacial episodes were important in shaping current genetic diversity patterns (Provan & Bennett, 2008). These changes in the environment caused by glaciations can influence the life-history traits of organisms, affecting not only their morphology but also their genetic structure (Carrea et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Phenotypic and genetic differentiation between diadromous and landlocked puyen Galaxias maculatus

Rojo

Fernández

Figueroa

et al. 2020

Journal of Fish Biology

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This study reports the phenotypic and genetic differences between individuals of puyen Galaxias maculatus from two sites in the same river basin in Tierra del Fuego National Park, southern South America. Individuals from the two sampling sites presented morphometric and genetic differences. The morphometric differences indicated that individuals from Laguna Negra (LN) were short and more robust and had large eyes, whereas those from Arroyo Negro (AN) were thin and elongated and had small eyes. Genetic differences showed that AN individuals had a greater genetic structuration and an older demographic history than LN individuals. The results of this study affirmed that the individuals from the two sampling sites belong to different populations with a high degree of isolation. The demographic history could indicate that the individuals of G. maculatus which migrated to northern areas during the last glaciation settled in the Beagle Channel after its formation. The LN population could have originated after the retreat of the glaciers, migrating from AN.

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Section: Introductionmentioning

confidence: 99%

Phenotypic and genetic differentiation between diadromous and landlocked puyen Galaxias maculatus

Rojo

Fernández

Figueroa

et al. 2020

Journal of Fish Biology

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“…Presently, evolutionary biologists tend to focus on whether population genetic structures have strong relationships with habitat, historical geological or climatic events (Hewitt ; Carrea et al . ; Ragionieri & Schubart ; Yan et al . ; Zhou et al .…”

Section: Introductionmentioning

confidence: 99%

Phylogeography of the Chinese endemic freshwater crab Sinopotamon acutum (Brachyura, Potamidae)

Fang

Zhao

et al. 2015

Zoologica Scripta

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Sun, H. (2015). Phylogeography of the Chinese endemic freshwater crab Sinopotamon acutum (Brachyura, Potamidae). -Zoologica Scripta, 44, 653-666. Phylogeographical inferences based on multiple molecular markers from different modes of inheritance (i.e. mtDNA and nucDNA) can help to explore drivers of current species divergence over different timescales and allow a deeper understanding of evolutionary processes. River systems and mountains, owing to their drainage networks and complex topography, are often a high priority when inferring external causes of phylogeographical patterns. Here, we selected the Chinese endemic freshwater crab Sinopotamon acutum inhabiting drainage networks across the Qinling-Daba Mountains, a watershed that divides northern from southern fauna in China, as a model species (1) to investigate whether river networks and mountain systems act as barriers in shaping the phylogeography of freshwater crabs and (2) to test the impact of historic environments and ecological habitats on crab distribution. Phylogenetic tree and network analyses based on mtDNA revealed divergence between eastern and western populations, but microsatellite DNA did not recover this. Frequent and male-biased gene flow is evident. The adjacent tributaries, such as Weihe River 1 and Hanjiang River 1, although isolated by Qinling Mts, have low genetic variation in mtDNA. In addition, microsatellite DNA showed low variation between all rivers. Frequent gene flow, genetic variation and mitochondrial genetic structure in S. acutum indicated that the Qinling-Daba Mountains have had no effect on divergence in this species; instead, hydrological networks across these mountains serve as a continuous migration corridor for these crabs. Glacial refugia are probably responsible for the initial isolation of the eastern and western clades, and local adaptations after dispersal have further driven divergence. Cytonuclear discordance in phylogeographical patterns may be attributable to ongoing male-biased gene flow.

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“…A subsequent study examining the postglacial history of G. maculatus suggested that landlocked populations originated from different colonization events suggesting some degree of genetic differentiation among ecotypes (Zemlak, Habit, Walde, Carrea, & Ruzzante, 2010). There is also evidence that resident and diadromous populations do live in sympatry (Carrea, Cussac, & Ruzzante, 2013;Górski, Habit, Pingram, & Manosalva, 2018) suggesting that there likely are genomic regions of differentiation between these life history types.…”

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confidence: 99%

The effects of diadromy and its loss on genomic divergence: The case of amphidromous Galaxias maculatus populations

et al. 2019

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Understanding the evolutionary mechanisms that affect the genetic divergence between diadromous and resident populations across heterogeneous environments is a challenging task. While diadromy may promote gene flow leading to a lack of genetic differentiation among populations, resident populations tend to be affected by local adaptation and/or plasticity. Studies on these effects on genomic divergence in nonmodel amphidromous species are scarce. Galaxias maculatus, one of the most widespread fish species in the Southern Hemisphere, exhibits two life histories, an ancestral diadromous, specifically, amphidromous form, and a derived freshwater resident form. We examined the genetic diversity and divergence among 20 estuarine and resident populations across the Chilean distribution of G. maculatus and assessed the extent to which selection is involved in the differentiation among resident populations. We obtained nearly 4,400 SNP markers using a RADcap approach for 224 individuals. As expected, collections from estuarine locations typically consist of diadromous individuals. Diadromous populations are highly differentiated from their resident counterparts by both neutral and putative adaptive markers. While diadromous populations exhibit high gene flow and lack site fidelity, resident populations appear to be the product of different colonization events with relatively low genetic diversity and varying levels of gene flow. In particular, the northernmost resident populations were clearly genetically distinct and reproductively isolated from each other suggesting local adaptation. Our study provides insights into the role of life history differences in the maintenance of genetic diversity and the importance of genetic divergence in species evolution.

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Genetic and phenotypic variation among Galaxias maculatus populations reflects contrasting landscape effects between northern and southern Patagonia

Cited by 24 publications

References 69 publications

Phenotypic and genetic differentiation between diadromous and landlocked puyen Galaxias maculatus

Phenotypic and genetic differentiation between diadromous and landlocked puyen Galaxias maculatus

Phylogeography of the Chinese endemic freshwater crab Sinopotamon acutum (Brachyura, Potamidae)

The effects of diadromy and its loss on genomic divergence: The case of amphidromous Galaxias maculatus populations

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