Stabilization of a salamander moving hybrid zone

Visser, Michaël; Leeuw, Maarten de; Zuiderwijk, A.C.M.; Arntzen, Jan W.

doi:10.1002/ece3.2676

Cited by 20 publications

(24 citation statements)

References 42 publications

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“…This is higher than in most other areas studied (e.g. Wood et al 2003) but lower than what we observed in western France (Visser et al 2017). Moreover, new ponds are also being created, making this a dynamic system.…”

Section: Population Developmentscontrasting

confidence: 63%

Amphibian decline, pond loss and reduced population connectivity under agricultural intensification over a 38 year period

et al. 2017

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Habitat loss, together with less obvious land-use changes such as intensified farming practice, can have significant adverse impacts on biodiversity. An important factor in determining the ability of species to cope with such changes is their potential to sustain a populations network by dispersal across the landscape. Habitat quality and structure are particularly important for surface-dwelling species with low dispersal abilities, such as amphibians. To assess this ecological function, ponds in a coastal and typically rural area of northern France were surveyed for amphibians in 1974, 1992 and 2011. These repeated surveys yielded different outcomes for different species groups. Three rare species persisted in more or less specialized habitat types. Two moderately common species declined, but kept strongholds in coastal dunes and associated marshes. Five common species with broad ecological niches remained equally widespread. The Northern crested newt declined markedly and the Midwife toad declined dramatically, as did their breeding habitats in vegetated ponds and cattle drinking troughs. One species, the Moor frog, may have gone locally extinct. A model of relative resistance to amphibian dispersal was created for different landscape types, on a scale from 0 (low resistance) to 1 (high resistance). This generated values of 0.23 for pasture, 0.72 for arable and 0.98 for urban and transport. As pasture declined in the study area, while arable and urban/transport infrastructure increased, amphibian dispersal became more difficult. However, dispersal paths proved difficult to evaluate in a patchy landscape like the one surveyed, due to a paucity of spatial 123Biodivers Conserv (2017) 26:1411-1430 DOI 10.1007/s10531-017-1307 signal. Pond loss is a more tractable reason for the observed amphibian species decline than is the quality of intervening terrestrial habitat matrix. In 2011, 22 newly created ponds had species richness in line with pre-existing ponds and this will have counteracted a dwindling metapopulation structure, indicating that habitat creation/restoration can play a valuable role in conservation. The colonization of new ponds may also prove more informative for gauging the potential for amphibian dispersal in the landscape than the preceding decline.

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Section: Population Developmentscontrasting

confidence: 63%

Amphibian decline, pond loss and reduced population connectivity under agricultural intensification over a 38 year period

et al. 2017

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“…This is in stark contrast with a T. cristatus x T. marmoratus hybrid zone in southwestern France where the hybridizing species are ecologically well differentiated. While T. marmoratus occupies mainly forested and hilly areas, T. cristatus is distributed in open and flat country (Schoorl & Zuiderwijk, ; Visser, Leeuw, Zuiderwijk, & Arntzen, ). Both species also reveal up to twice higher genetic divergence in comparison with T. cristatus and T. carnifex , a bimodal type of the hybrid zone with limited hybridization and introgression caused by strong postzygotic genomic incompatibilities (Arntzen, Jehle, Bardakci, Burke, & Wallis, ).…”

Section: Discussionmentioning

confidence: 99%

Species‐specific habitat preferences do not shape the structure of a crested newt hybrid zone (Triturus cristatus x T. carnifex)

Mačát

Rulı́k

Jablonski

et al. 2019

Ecology and Evolution

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Reproductive isolation barriers maintain the integrity of species by preventing interspecific gene flow. They involve temporal, habitat or behavioral isolation acting before fertilization, and postzygotic isolation manifested as hybrid mortality or sterility. One of the approaches of how to study reproductive isolation barriers is through the analysis of hybrid zones. In this paper, we describe the structure of a hybrid zone between two crested newt species (Triturus cristatus and T. carnifex) in the southern part of the Czech Republic using morphological, microsatellite, and mitochondrial (mtDNA) markers. Specifically, we tested the hypothesis that the structure of the hybrid zone is maintained by species‐specific habitat preferences. Comparing the genetic structure of populations with geographical and ecological parameters, we found that the hybrid zone was structured primarily geographically, with T. cristatus‐like populations occurring in the northeast and T. carnifex‐like populations in the southwest. Despite T. cristatus tending to occur in deeper ponds and T. carnifex on localities with more shading, the effect of both ecological parameters on the structure of the zone was minimal. Next, we corroborated that T. carnifex individuals and some hybrids possess mtDNA of T. dobrogicus, whose nuclear background was not detected in the studied hybrid zone. Hybridization between T. carnifex and T. dobrogicus (resulting in unidirectional mtDNA introgression) had to predate subsequent formation of the hybrid zone between T. cristatus and T. carnifex. Populations of crested newts in the southern part of the Czech Republic thus represent a genetic mosaic of nuclear and mitochondrial genomes of three species.

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“…While several cases of moving hybrid zones have been documented, their prevalence is probably underestimated (Buggs, ; Wielstra et al., ). This is because the best way to characterize a moving hybrid zone is through the repeated study of predefined transects over different time periods, which is rarely feasible (Engebretsen, Barrow, Rittmeyer, Brown, & Moriarty Lemmon, ; Visser, de Leeuw, Zuiderwijk, & Arntzen, ). Additional insights can be obtained from the combination of cline and phylogeographical analyses on the distribution of alleles in the contact zone in a single time frame.…”

Section: Introductionmentioning

confidence: 99%

Hybrid zone formation and contrasting outcomes of secondary contact over transects in common toads

Arntzen

Vries²,

Canestrelli³

et al. 2017

Molecular Ecology

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Much progress in speciation research stems from documenting patterns of morphological and genetic variation in hybrid zones. Contrasting patterns of marker introgression in different sections of the contact can provide valuable insights on the relative importance of various evolutionary mechanisms maintaining species differences in the face of hybridization and gene flow and on hybrid zone temporal and spatial dynamics. We studied species interactions in the common toads Bufo bufo and B. spinosus in France and northwestern Italy using morphological and molecular data from the mitochondrial and nuclear genomes in an extensive survey, including two independent transects west and east of the Alps. At both, we found sharp, coincident and concordant nuclear genetic transitions. However, morphological clines were wider or absent and mtDNA introgression was asymmetric. We discuss alternative, nonexclusive hypotheses about evolutionary processes generating these patterns, including drift, selection, long-distance dispersal and spatial shifts in hybrid zone location and structure. The distribution of intraspecific mtDNA lineages supports a scenario in which B. bufo held a local refugium during the last glacial maximum. Present-day genetic profiles are best explained by an advance of B. spinosus from a nearby Iberian refugium, largely superseding the local B. bufo population, followed by an advance of B. bufo from the Balkans, with prongs north and south of the Alps, driving B. spinosus southwards. A pendulum moving hybrid zone, first northwards and then southwards, explains the wide areas of introgression at either side of the current position of the contact zones.

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Stabilization of a salamander moving hybrid zone

Cited by 20 publications

References 42 publications

Amphibian decline, pond loss and reduced population connectivity under agricultural intensification over a 38 year period

Amphibian decline, pond loss and reduced population connectivity under agricultural intensification over a 38 year period

Species‐specific habitat preferences do not shape the structure of a crested newt hybrid zone (Triturus cristatus x T. carnifex)

Hybrid zone formation and contrasting outcomes of secondary contact over transects in common toads

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