Conservation genetics of threatened Mexican axolotls (Ambystoma)

  title={Conservation genetics of threatened Mexican axolotls (Ambystoma)},
  author={Gabriela Parra‐Olea and Kelly R. Zamudio and Ernesto Recuero and X Aguilar-Miguel and D. Huacuz and Luis Zambrano},
  journal={Animal Conservation},
The loss of genetic diversity in small or isolated populations can increase inbreeding, decrease fitness and adaptive potential and increase a species’ probability of extinction. [] Key Method We also test the utility of our markers in assigning illegally harvested individuals to populations of origin. We found reduced genetic diversity in paedomorphic compared with some, but not all, metamorphic populations. Populations of both forms showed genetic signatures of bottlenecks, underscoring that factors other…

Genetic diversity and structure of two endangered mole salamander species of the Trans-Mexican Volcanic Belt

The goal of this study was to provide data from the population genetics of two micro-endemic mole salamanders from the Trans-Mexican Volcanic Belt to propose better management plans and conservation efforts for these species.

Genetic structure and diversity in an isolated population of an endemic mole salamander (Ambystoma rivulare Taylor, 1940) of central Mexico

The structural analysis found two subpopulations, one for each river sampled, with no signs of admixture and very high levels of genetic differentiation, and evidence of an ancestral genetic bottleneck, low values of effective population size, small inbreeding coefficients, and low gene flow.

Genetic diversity and structure of two populations of Ambystoma altamirani and A. rivulare of the trans-Mexican volcanic belt.

The goal of this study was to provide data from the population genetics of two micro-endemic mole salamanders that can be used as a basis for future research and conservation planning of these species and other amphibian species of this region of Mexico.

Genetic diversity and demography of the critically endangered Roberts’ false brook salamander (Pseudoeurycea robertsi) in Central Mexico

The results based on the cytochrome b showed two divergent lineages, with moderate levels of genetic diversity and a recently historical demographic expansion in Pseudoeurycea robertsi, a micro-endemic and critically endangered species from the Nevado de Toluca Volcano, Mexico.

Genetic variability and structure of an isolated population of Ambystoma altamirani, a mole salamander that lives in the mountains of one of the largest urban areas in the world

The mole salamander, Ambystoma altamirani is a microendemic species, which is distributed in central México, within the trans-Mexican volcanic belt, and is one of the most threatened species due to habitat destruction and the introduction of exotic species.

All grown-up and nowhere to go: paedomorphosis and local adaptation in Ambystoma salamanders in the Cuenca Oriental of Mexico

It is shown that the first divergence among populations occurred between Alchichica and the remaining populations and that the evolution of paedomorphosis in A. taylori was likely favoured by local adaptation to saline conditions, thus increasing its genetic isolation.

Geography is more important than life history in the recent diversification of the tiger salamander complex

Using a large multilocus dataset, evidence of gene flow between taxa with different life history strategies is presented, suggesting that obligate paedomorphosis is not a strong driver of speciation in the tiger salamander complex.

Genetic structure and diversity of the endangered growling grass frog in a rapidly urbanizing region

The mtDNA and nuclear DNA sequences revealed low levels of genetic diversity throughout remnant populations of L. raniformis, but one of the four regions studied, Cardinia, exhibited relatively high genetic diversity and several unique haplotypes, suggesting this region should be recognized as a separate Management Unit.

Positive selection drives the evolution of a major histocompatibility complex gene in an endangered Mexican salamander species complex

Investigating MHC evolution in populations of five salamander species within the Ambystoma velasci complex finds strong evidence that positive selection is a major evolutionary force driving patterns of MHC polymorphism in this recently radiated species complex.

Predicting Ambystoma ordinarium Habitat in Central Mexico Using Species Distribution Models

Abstract Amphibian diversity in Neotropical mountains habitats is at risk, particularly those species associated with stream habitats at altitudes >500 m above sea level (a.s.l.). This pertains



Population structure and genetic diversity of metamorphic and paedomorphic populations of the tiger salamander, Ambystoma tigrinum

Far greater genetic differentiation exists between subspecies than within subspecies, suggesting that the subspecies have evolved in allopatry and extensive population subdivision indicates that populations can respond to extremely localized selection pressures.

Inbreeding effects in wild populations.

Genetics, Demography and Viability of Fragmented Populations: Managing and monitoring genetic erosion

This approach presumes the authors have the ability to directly or indirectly manipulate and measure adaptive genetic variants, such as many multilocus (quantitative) traits, or a representative array of single-locus traits associated with fitness.

Habitat fragmentation causes bottlenecks and inbreeding in the European tree frog (Hyla arborea)

A severe fragmentation process reducing population size and fitness within some of the populations probably caused the significant reduction in genetic variation of tree frog populations on Lolland.

The Relationship Between Allozyme Variation and Life History: Non-transforming Salamanders are Less Variable

There is a strong relationship between larval reproduction and genetic variation: larval reproducers are less variable, on average, than metamorphosing salamander species, but this relationship is interpreted as a difference in the population structures of transforming and non-transforming salamanders, rather than representing a causal relationship between structural genetic variation and components of fitness.

Urban Aquatic Habitats and Conservation of Highly Endangered Species: The Case of Ambystoma mexicanum (Caudata, Ambystomatidae)

High incidence of parasites and deformities among individuals in this population of axolotls could negatively impact their viability, and the important role that artificial or semi-natural urban habitats can play in the conservation of highly threatened species is emphasized.

Genetics, Demography and Viability of Fragmented Populations: Inbreeding in small populations of red-cockaded woodpeckers: insights from a spatially explicit individual-based model

It is concluded that inbreeding depression is a very serious threat to the viability of the many small, isolated and declining populations of red-cockaded woodpecker populations.

Immigration and the ephemerality of a natural population bottleneck: evidence from molecular markers

Results show that immigration at levels that are hard to measure in most field studies can lead to qualitatively very different genetic outcomes from those expected from mutations only, and suggest that future theoretical and empirical work on bottlenecks and metapopulations should address the impact of immigration.

Multiple nuclear gene sequences identify phylogenetic species boundaries in the rapidly radiating clade of Mexican ambystomatid salamanders

A expressed sequence tag database is made use of to perform nuclear and mitochondrial genealogical tests of species boundaries in Ambystoma ordinarium, a member of an adaptive radiation of metamorphic and paedomorphic salamanders that have diversified across terrestrial and aquatic environments to demonstrate how EST‐based nuclear resources can be used to more fully resolve the phylogenetic history of species radiations.

Relative Contribution of Inbreeding Depression and Eroded Adaptive Diversity to Extinction Risk in Small Populations of Shore Campion

Reintroduction success was related to adaptive diversity, suggesting that the fixation of overall deleterious genes causing inbreeding depression posed a more serious threat to the short-term survival of the populations than the loss of genes involved in genotype and environment interactions.