Population genetic analysis of microsatellite variation of guppies (<i>Poecilia reticulata</i>) in Trinidad and Tobago: evidence for a dynamic source–sink metapopulation structure, founder events and population bottlenecks

Barson, Nicola J.; Cable, Joanne; Oosterhout, Cock van

doi:10.1111/j.1420-9101.2008.01675.x

Cited by 112 publications

(168 citation statements)

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“…These migrants may be homozygous for alleles that are rare in the recipient downstream population, resulting in the observed heterozygote deficiency. Consistent with this explanation is the study by Barson et al (2009), who showed that the lowland Caroni populations also had a heterozygote deficit at highly polymorphic microsatellite markers that they explained by the inflow of migrants from upstream populations when the rivers were in spate during the wet season rains (van Oosterhout et al, 2007;McMullan and van Oosterhout, 2012).…”

Section: Divergent Selection For Opsin Genessupporting

confidence: 61%

“…The allele frequencies differed among populations and the differences were notably larger between the Northern/Caroni drainages of Trinidad (LY, UA, LA, UG and LG) and the other populations (Figure 2). The opsin genes in the downstream populations (LA, LG and LY) were more polymorphic than those in the upstream population (UA and UG; Figure 2 and Supplementary Tables S4 and S5) that is consistent with the higher level of genetic drift and genetic isolation found in upland regions (Barson et al, 2009;Willing et al, 2010). The SWS2-B opsin gene was highly polymorphic and the allele compositions differed among the streams.…”

Section: Overall Nucleotide Variation In Opsin Genessupporting

confidence: 55%

“…There appeared to be some fragmentation within the sample populations because most of the Tajima's D values were positive in the reference regions (Supplementary Table S2). Our assumption of constant population size (in the upland sites) appeared to be reasonable because Barson et al (2009) found that even small upland guppy populations were stable and approached mutation-drift equilibrium. We performed coalescent simulations for each local population, where we assumed that there were two subpopulations and we allowed migration between them.…”

Section: Coalescent Simulations Of Tajima's D Test For Balancing Selementioning

confidence: 99%

“…Upstream migration over the waterfalls is severely limited, although the rate of gene flow is considerably higher than the mutation rate (Carvalho et al, 1991;van Oosterhout et al, 2006;Barson et al, 2009;Willing et al, 2010). The Caroni drainage is considered to be a source-sink metapopulation, where the downstream populations represent a 'super sink' that receives immigrants from the upstream populations (Barson et al, 2009). Northern drainage is isolated from Caroni drainage, but there is disrupted natural migration among drainages (Magurran, 2005).…”

Section: Sample Populationsmentioning

confidence: 99%

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Divergent selection for opsin gene variation in guppy (Poecilia reticulata) populations of Trinidad and Tobago

et al. 2014

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The guppy is known to exhibit remarkable interindividual variations in spectral sensitivity of middle to long wavelength-sensitive (M/LWS) cone photoreceptor cells. The guppy has four M/LWS-type opsin genes (LWS-1, LWS-2, LWS-3 and LWS-4) that are considered to be responsible for this sensory variation. However, the allelic variation of the opsin genes, particularly in terms of their absorption spectrum, has not been explored in wild populations. Thus, we examined nucleotide variations in the four M/LWS opsin genes as well as blue-sensitive SWS2-B and ultraviolet-sensitive SWS1 opsin genes for comparison and seven non-opsin nuclear loci as reference genes in 10 guppy populations from various light environments in Trinidad and Tobago. For the first time, we discovered a potential spectral variation (180 Ser/Ala) in LWS-1 that differed at an amino acid site known to affect the absorption spectra of opsins. Based on a coalescent simulation of the nucleotide variation of the reference genes, we showed that the interpopulation genetic differentiation of two opsin genes was significantly larger than the neutral expectation. Furthermore, this genetic differentiation was significantly related to differences in dissolved oxygen (DO) level, and it was not explained by the spatial distance between populations. The DO levels are correlated with eutrophication that possibly affects the color of aquatic environments. These results suggest that the population diversity of opsin genes is significantly driven by natural selection and that the guppy could adapt to various light environments through color vision changes.

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Section: Divergent Selection For Opsin Genessupporting

confidence: 61%

Section: Overall Nucleotide Variation In Opsin Genessupporting

confidence: 55%

Section: Coalescent Simulations Of Tajima's D Test For Balancing Selementioning

confidence: 99%

Section: Sample Populationsmentioning

confidence: 99%

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Divergent selection for opsin gene variation in guppy (Poecilia reticulata) populations of Trinidad and Tobago

et al. 2014

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“…Compensatory upstream migration in the lowlands may allow the return of displaced fish that have not been swept over such barriers (see Barson et al 2009, Willing et al 2010). In addition, distinct differences exist in predator and parasite faunas between upland and lowland habitats (Endler 1980, Reznick et al 2001.…”

Section: Discussionmentioning

confidence: 99%

Upstream guppies (Poecilia reticulata, Peters, 1859) go against the flow

et al. 2012

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Guppies (Poecilia reticulata Peters 1859) in lakes and from captive-bred populations are predicted to show little rheotaxis compared to conspecifics in a stream environment that are regularly exposed to flash floods associated with involuntary downstream migration. Here we test this hypothesis using an artificial stream, examining guppies of two wild riverine populations, one lake population, and one ornamental strain. Guppies from the most upstream riverine habitat show the most pronounced rheotaxis and are less likely to be swept downstream during flooding events. However, there is no significant difference between guppies from the lowland riverine habitat, the Pitch Lake and ornamental strain. We propose that station-keeping behaviours are most strongly selected in the upstream population because large spatial differences exist in ecology and environment between up-and downstream habitats. Given that these sites are separated by barrier waterfalls that prevent compensatory upstream migration, natural selection operates particularly strong against upstream guppies that have been displaced downstream during flooding events. Resumo: Populações de guppies (Poecilia reticulata Peters) que vivem em lagos e em cativeiro podem demonstrar menos reotaxia em comparação com populações que habitam rios e que estão frequentemente expostas a enchentes e que provocam a migração involuntária para jusante. Neste trabalho, vamos testar esta hipótese num rio artificial utilizando guppies de duas populações selvagens que habitam em rios, uma população que habita em lagos, e uma linhagem ornamental. Os resultados demonstram que os guppies de rios que provêm de localidades a montante demonstram maior reotaxia, diminuindo assim probabilidade de serem arrastados para jusante em períodos de enchentes. No entanto, não foram encontradas diferenças significativas entre guppies de localidades a jusante, do lago Pitch ou ornamentais. Este resultado pode dever-se ao facto de existirem grandes diferenças ecológicas entre os habitats localizados a jusante e a montante dos rios. Devido ao facto de estas localidades estarem separadas por cachoeiras, impossibilitando a migração rio-acima, a seleção natural poderá estar a actuar contra guppies que sejam arrastados rio abaixo durantes os períodos de cheias Palavras-chave: Guppy (Poeciliareticulata), reotaxia, piscina comportamento, migração, seleção natural. Neotrop., vol. 12, no. 3 were conducted because guppies infected with Gyrodactylus spp. are more likely to be swept downstream than uninfected counterparts van (van Oosterhout et al. 2007a). Briefly, guppies were anaesthetised with 0.02% MS222 and using a stereo-microscope and fibre optic illumination, gyrodactylids were removed with watchmaker's tweezers. Fish were clean of all ectoparasites and showed no symptoms of disease in the two weeks prior to the experiment. The behaviour of guppies was recorded in an artificial stream (length × width × depth = 112.2 × 12 × 4.0 cm 3 ). The water flow rate was 15.4 (±1.2) cm.s -1 , compar...

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Molecular Ecology

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Population genetic analysis of microsatellite variation of guppies (Poecilia reticulata) in Trinidad and Tobago: evidence for a dynamic source–sink metapopulation structure, founder events and population bottlenecks

Cited by 112 publications

References 69 publications

Divergent selection for opsin gene variation in guppy (Poecilia reticulata) populations of Trinidad and Tobago

Divergent selection for opsin gene variation in guppy (Poecilia reticulata) populations of Trinidad and Tobago

Upstream guppies (Poecilia reticulata, Peters, 1859) go against the flow

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