Introgressive hybridization between two species of waterstriders (Hemiptera: Gerridae: <i>Limnoporus</i>): geographical structure and temporal change of a hybrid zone

Klingenberg,; Spence,; Mirth, Christen K.

doi:10.1046/j.1420-9101.2000.00224.x

Cited by 18 publications

(11 citation statements)

References 41 publications

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“…; Buggs and Pannell ), hybrid fitness (Klingenberg et al. ), anthropogenic environmental disturbance (Blum ), and climate change (Britch et al. ; Taylor et al.…”

Section: Discussionmentioning

confidence: 99%

Rapid movement and instability of an invasive hybrid swarm

Glotzbecker

Walters

Blum

2016

Evolutionary Applications

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Unstable hybrid swarms that arise following the introduction of non‐native species can overwhelm native congeners, yet the stability of invasive hybrid swarms has not been well documented over time. Here, we examine genetic variation and clinal stability across a recently formed hybrid swarm involving native blacktail shiner (Cyprinella venusta) and non‐native red shiner (C. lutrensis) in the Upper Coosa River basin, which is widely considered to be a global hot spot of aquatic biodiversity. Examination of phenotypic, multilocus genotypic, and mitochondrial haplotype variability between 2005 and 2011 revealed that the proportion of hybrids has increased over time, with more than a third of all sampled individuals exhibiting admixture in the final year of sampling. Comparisons of clines over time indicated that the hybrid swarm has been rapidly progressing upstream, but at a declining and slower pace than rates estimated from historical collection records. Clinal comparisons also showed that the hybrid swarm has been expanding and contracting over time. Additionally, we documented the presence of red shiner and hybrids farther downstream than prior studies have detected, which suggests that congeners in the Coosa River basin, including all remaining populations of the threatened blue shiner (Cyprinella caerulea), are at greater risk than previously thought.

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“…; Buggs and Pannell ), hybrid fitness (Klingenberg et al. ), anthropogenic environmental disturbance (Blum ), and climate change (Britch et al. ; Taylor et al.…”

Section: Discussionmentioning

confidence: 99%

Rapid movement and instability of an invasive hybrid swarm

Glotzbecker

Walters

Blum

2016

Evolutionary Applications

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“…Mosaic hybrid zones have received much attention in recent years (Klingenberg et al 2000;Ross and Harrison 2002;Bierne et al 2003;Vines et al 2003). In some cases, local patches are correlated with local habitat, implying that the mosaic structure is maintained by strong and spatially heterogeneous selection (Ross and Harrison 2002).…”

Section: Discussionmentioning

confidence: 99%

Genetic Drift Widens the Expected Cline but Narrows the Expected Cline Width

Polechová

Barton

2011

Genetics

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Random genetic drift shifts clines in space, alters their width, and distorts their shape. Such random fluctuations complicate inferences from cline width and position. Notably, the effect of genetic drift on the expected shape of the cline is opposite to the naive (but quite common) misinterpretation of classic results on the expected cline. While random drift on average broadens the overall cline in expected allele frequency, it narrows the width of any particular cline. The opposing effects arise because locally, drift drives alleles to fixation-but fluctuations in position widen the expected cline. The effect of genetic drift can be predicted from standardized variance in allele frequencies, averaged across the habitat: hF i. A cline maintained by spatially varying selection (step change) is expected to be narrower by a factor of ffiffiffiffiffiffiffiffiffiffiffiffiffi 12hFi p relative to the cline in the absence of drift. The expected cline is broader by the inverse of this factor. In a tension zone maintained by underdominance, the expected cline width is narrower by about 1 -hF i relative to the width in the absence of drift. Individual clines can differ substantially from the expectation, and we give quantitative predictions for the variance in cline position and width. The predictions apply to clines in almost one-dimensional circumstances such as hybrid zones in rivers, deep valleys, or along a coast line and give a guide to what patterns to expect in two dimensions. WITHIN species, substantial genetic diversity may be maintained by the interaction between selection and gene flow. This may be manifest in gradients in heritable traits or in allele frequency (Endler 1977). Clines reflect the degradation by gene flow of adaptation to the local environment or genetic background, and they may be used to estimate the strength of selection experienced by natural populations. Often, it is assumed that the effects of drift on the realized clines can be neglected.Random genetic drift will shift clines from side to side, alter their width, and distort their shape (Felsenstein 1975;Slatkin and Maruyama 1975;Nagylaki 1978). Such random fluctuations complicate inferences from cline width and position, but may themselves be used to infer rates of gene flow, drift, and selection. More important, drift is expected to reduce local diversity and so to make selection less effective, thereby interfering with adaptation to local conditions. The common view is that genetic drift makes clines slightly shallower, because selection becomes less effective. This comes from a "generalization" of the effect of genetic drift on the "expected cline" as derived by Slatkin and Maruyama (1975) (see, e.g., Alleaume-Benharira et al. 2006). However, the characteristics of the expected cline do not necessarily give an adequate idea of the patterns we expect to see in specific clines. Here, we define the expected cline as the average allele frequency across independent realizations, taken at the same time, and so it includes the i...

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“…Katydid Orchelimum nigripes females show a conspecific mate preference, whereas O. pulchellum females show no clear preference; this may cause movement in favour of O. nigripes (Shapiro, 2001). Waterstrider Limnoporus notabilis females prefer Limnoporus dissortis and hybrid males, giving movement in favour of L. dissortis (Spence, 1990;Sperling and Spence, 1991;Klingenberg et al, 2000). In a 5-year allozyme study, all hybrids between the minnows Pseudorasbora pumila and Pseudorasbora parva have P. pumila mtDNA suggesting that this tension zone moves in favour of P. parva due to asymmetrical hybridization (Konishi and Takata, 2004a).…”

Section: Identifying Causes Of Hybrid Zone Movementmentioning

confidence: 99%

Empirical study of hybrid zone movement

2007

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Hybrid zones are 'natural laboratories' for studying the origin, maintenance and demise of species. Theory predicts that hybrid zones can move in space and time, with significant consequences for both evolutionary and conservation biology, though such movement is often perceived as rare. Here, a review of empirical studies of moving hybrid zones in animals and plants shows 23 examples with observational evidence for movement, and a further 16 where patterns of introgression in molecular markers could be interpreted as signatures of movement. The strengths and weaknesses of methods used for detecting hybrid zone movement are discussed, including long-term replicated sampling, historical surveys, museum/ herbarium collections, patterns of relictual populations and introgression of genetic markers into an advancing taxon. Factors governing hybrid zone movement are assessed in the light of the empirical studies, including environmental selection, competition, asymmetric hybridization, dominance drive, hybrid fitness, human activity and climate change. Hybrid zone movement means that untested assumptions of stability in evolutionary studies on hybrid zone can lead to mistaken conclusions. Movement also means that conservation effort aimed at protecting against introgression could unwittingly favour an invading taxon. Moving hybrid zones are of wide interest as examples of evolution in action and possible indicators of environmental change. More long-term experimental studies are needed that incorporate reciprocal transplants, hybridization experiments and surveys of molecular markers and population densities on a range of scales.

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Introgressive hybridization between two species of waterstriders (Hemiptera: Gerridae: Limnoporus): geographical structure and temporal change of a hybrid zone

Cited by 18 publications

References 41 publications

Rapid movement and instability of an invasive hybrid swarm

Rapid movement and instability of an invasive hybrid swarm

Genetic Drift Widens the Expected Cline but Narrows the Expected Cline Width

Empirical study of hybrid zone movement

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