Intraspecific Sympatry in a "Ring Species," the Plethodontid Salamander Ensatina eschscholtzii, in Southern California

Wake, David B.; Yanev, Kay P.; Brown, Charles W.

doi:10.2307/2408473

Cited by 39 publications

(73 citation statements)

References 6 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Subsequent research has shown that xanthoptica and platensis hybridize wherever they meet, but in very narrow hybrid zones (on the order of several home range diameters in width, or a few hundred meters). While klauberi and eschscholtzii hybridize, they do so less frequently and in even narrower hybrid zones (10,13). At the southernmost area of contact, the two forms are sympatric with no evidence of past or present hybridization (13,14).…”

mentioning

confidence: 99%

Incipient species formation in salamanders of the Ensatina complex

Wake

1997

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

156

150

View full text Add to dashboard Cite

The Ensatina eschscholtzii complex of plethodontid salamanders, a well-known ''ring species,'' is thought to illustrate stages in the speciation process. Early research, based on morphology and coloration, has been extended by the incorporation of studies of protein variation and mitochondrial DNA sequences. The new data show that the complex includes a number of geographically and genetically distinct components that are at or near the species level. The complex is old and apparently has undergone instances of range contraction, isolation, differentiation, and then expansion and secondary contact. While the hypothesis that speciation is retarded by gene f low around the ring is not supported by molecular data, the general biogeographical hypothesis is supported. There is evidence of a north to south range expansion along two axes, with secondary contact and completion of the ring in southern California. Current research targets regions once thought to show primary intergradation, but which molecular markers reveal to be zones of secondary contact. Here emphasis is on the subspecies E. e. xanthoptica, which is involved in four distinct secondary contacts in central California. There is evidence of renewed genetic interactions upon recontact, with greater genetic differentiation within xanthoptica than between it and some of the interacting populations. The complex presents a full array of intermediate conditions between well-marked species and geographically variable populations. Geographically differentiated segments represent a diversity of depths of time of isolation and admixture, ref lecting the complicated geomorphological history of California. Ensatina illustrates the continuing difficulty in making taxonomic assignments in complexes studied during species formation.

show abstract

mentioning

confidence: 99%

Incipient species formation in salamanders of the Ensatina complex

Wake

1997

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

156

150

View full text Add to dashboard Cite

show abstract

“…2). Levels of interbreeding suggest that reproductive isolation is not nearly so complete in the Sierra Nevada as in the southern contact between eschscholtzii and klauberi, and this mid-ring contact was thus viewed as consistent with the ring species scenario (Wake et al, 1989). In summary, despite the imperfections, Stebbins saw in Ensatina a compelling example of a ring species, as it included divergence along both distributional arms, a midring contact showing that hybridization was still possible, and sympatry of subspecies in southern California (Stebbins, 1949).…”

Section: A Brief Review Of Two Prominent Ring Species Complexesmentioning

confidence: 99%

“…pervasive in the mid-ring contact between xanthoptica and eschscholtzii (Brown, 1974;Wake et al, 1989;Alexandrino et al, 2005;Pereira and Wake, 2009) than it is in the terminal contact between klauberi and eschscholtzii (Brown, 1974;Devitt et al, 2011). Both regions of contact involve what would be considered species-level entities by most criteria, except an extreme version of the biological species concept that does not allow for any interbreeding at all.…”

Section: A Brief Review Of Two Prominent Ring Species Complexesmentioning

confidence: 99%

Wherefore and Whither the Ring Species?

Kuchta¹,

Wake²

2016

Copeia

Self Cite

View full text Add to dashboard Cite

Section: Taxonomymentioning

confidence: 99%

“…klauberi) in southern California (Stebbins 1949). Behaving as closely related but distinct species, unblotched eschscholtzii and blotched klauberi are known to hybridize occasionally (Brown 1974, Wake andYanev 1986), and Highton (1998) advocated species-level recognition with hybrid zones for all the infraspecific taxa within Ensatina. However, Wake and Schneider (1998), while ac-knowledging that the ensatina does not meet all of the criteria for a true ring species, argued against disrupting the long-stable taxonomy of this species complex until further morphological and genetic studies are completed.…”

Section: Taxonomymentioning

confidence: 99%

Planning for biodiversity: bringing research and management together; Proceedings of a Symposium for the South Coast Ecoregion

Kus¹,

Beyers²

2005

View full text Add to dashboard Cite

Southern California, recognized as a major center of biodiversity, contains some of the most diverse habitats of any landscape in North America. The ever-expanding human population of the region desires land, water, resources, and recreation, creating conflict with the habitat requirements of many rare species. Managing resources in a way that maximizes biodiversity in remaining habitats, while providing opportunities for other appropriate uses of the land, presents a formidable challenge, requiring coordination between scientists and resource managers. The papers in this proceedings volume reflect the breadth of issues facing the science and management communities in southern California, ranging from the threats of fire, air pollution, grazing, exotic species invasion, and habitat loss on native habitats and sensitive species, including birds, mammals, reptiles and amphibians, to the role of mycorrhizal fungi as indicators of biological change.Retrieval Terms: air pollution impacts, biological diversity, California south coast ecoregion, fire management, habitat management, rare species Technical CoordinatorsBarbara IntroductionSouthern California contains some of the most diverse habitats of any landscape in North America and is recognized as a major center of biodiversity. It is also home to an ever-expanding human population, with needs for land, water, resources, and recreation that conflict directly with the habitat requirements of many species. As a result, this region has more endangered and threatened species than any other area in the continental United States, and once-extensive natural communities, many of which are unique to the ecoregion, have been reduced to mere remnants.Managing resources in a way that maximizes biodiversity in remaining habitats while providing opportunities for other appropriate uses of the land presents a formidable challenge requiring coordination between scientists and resource managers, yet few opportunities exist for regular exchange of information and ideas between these groups. In response to this need, the U.S. Geological Survey and the USDA ForestService partnered to co-host a symposium on "Planning for Biodiversity: Bringing California. The goal of the 3-day conference was to identify the current status of our knowledge and gaps in our understanding of regional biodiversity and ecosystem processes, present and future threats to species and habitats, and effective monitoring strategies for southwestern and central coastal California resources. Through a program of 52 invited presentations, 18 contributed posters, and 10 focused discussion groups, the conference created an environment for formal and informal communication among the 300 attendees about the results of scientific studies and their application to resource conservation and management, as well as the information needs of managers responsible for determining and implementing management on the ground.Of the 45 technical papers presented at the conference, 14 are included in this volume. Authors were asked to...

show abstract

Intraspecific Sympatry in a "Ring Species," the Plethodontid Salamander Ensatina eschscholtzii, in Southern California

Cited by 39 publications

References 6 publications

Incipient species formation in salamanders of the Ensatina complex

Incipient species formation in salamanders of the Ensatina complex

Wherefore and Whither the Ring Species?

Planning for biodiversity: bringing research and management together; Proceedings of a Symposium for the South Coast Ecoregion

Contact Info

Product

Resources

About