Inter-specific relationships ofLeiopelma (Amphibia: Anura): Further karyological evidence

Stephenson, E. M.; Robinson, E. S.; Stephenson, N. G.

doi:10.1007/bf01945165

Cited by 19 publications

(9 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2). L. hochstetteri is widely divergent from the other three species, confirming many previous studies, e.g., Stephenson et al (1972Stephenson et al ( , 1974, Bell (1978aBell ( , 1982a, Daugherty et al (1981Daugherty et al ( , 1982, Cree (1985), Green et al (1989).…”

Section: Differentiation From Other Taxa Allozyme Variation and Populsupporting

confidence: 74%

Leiopelma pakeka,n. sp. (Anura: Leiopelmatidae), a cryptic species of frog from Maud Island, New Zealand, and a reassessment of the conservation status ofL. hamiltonifrom Stephens Island

Bell

Daugherty

Hay

1998

Journal of the Royal Society of New Zealand

View full text Add to dashboard Cite

Patterns of allozyme variation reveal that frogs from Maud Island, New Zealand, here designated Leiopelma pakeka, n sp , are specifically distinct from L hamiltoni from Stephens Island Previously, the two populations had been thought to be conspecific Leiopelma pakeka shows limited morphological differentiation from L hamiltoni, but is highly distinct genetically Among 12 allozyme loci resolved from toe tissue, the two taxa showed fixed differences at two loci and one significant frequency difference L hamiltoni was genetically more similar to L archeyi (Nei's D = 0 18) than to L pakeka (D = 0 24) The discovery that Maud Island and Stephens Island frogs are distinct species increases the conservation significance of both as the single known population of each species L hamiltoni is one of the world's rarest frogs and warrants the highest level of conservation protection

show abstract

Section: Differentiation From Other Taxa Allozyme Variation and Populsupporting

confidence: 74%

Leiopelma pakeka,n. sp. (Anura: Leiopelmatidae), a cryptic species of frog from Maud Island, New Zealand, and a reassessment of the conservation status ofL. hamiltonifrom Stephens Island

Bell

Daugherty

Hay

1998

Journal of the Royal Society of New Zealand

View full text Add to dashboard Cite

show abstract

“…L. archeyi occurs at higher elevations along the Coromandel Peninsula, and L. hamiltoni is oonfined to 14 ha of remnant forest on Maud Island and a 600 m' rock pile on Stephens Island (Crook et al 1971, Newman 1977, Bell 1978a. Geographic and interspeoific variation within Leiopelma have been examined with respect to karyology (Stephenson et al 1972(Stephenson et al , 1974 and to morphology, eoology, and development (Bell 1978a).…”

Section: Introductionmentioning

confidence: 99%

An electrophoretic study of genetic variation in the New Zealand frog genusLeiopelma

Daugherty

Bell

Adams

et al. 1981

New Zealand Journal of Zoology

View full text Add to dashboard Cite

Genetic variation at 33 loci in three species of Leiopelma was examined by cellulose acetate electrophoresis of liver enzymes. Heterozygosity is apparently comparable to levels detected in other amphibians. Genetic differentiation between species is extensive. L. hochstetteri is greatly divergent from both L. archeyi and L. hamiltoni, but these two are relatively similar genetically, in agreement with morphological, ecological, and developmental patterns. We tentatively estimate that the divergence of hochstetteri from the other two species occutrred during the Miocene, whereas that of archeyi and hamiltoni occurred during the Piiocl!ne. Implications of the genetic data for oonservation of these rare species are discussed.

show abstract

“…The unstained karyotypes of L. archeyi and /.. Iiamilloni are, in fact, even more similar than Stephenson et al (1972Stephenson et al ( , 1974 had thought. Stephenson et al (1972) had placed the site of the second ary constriction in L. archeyi on chromosome 6.…”

Section: Discussionmentioning

confidence: 77%

“…All but two pairs of chromosomes in L. hamiltoni are readily identifiable by their distinctive heterochromatin distribution, as demonstrated by C-banding. Although previously overlooked by Stephenson et al (1974), heteromorphic sex chromosomes and female heterogamety have been identified in L. hamiltoni (Green, 1988b). The third species o f Leiopelma.…”

mentioning

confidence: 99%

Comparative cytogenetics of the primitive frog, <i>Leiopelma archeyi </i>(Anura, Leiopelmatidae)

Green

Sharbel

1988

Cytogenet Genome Res

View full text Add to dashboard Cite

Chromosomally, Leiopelma archeyi is extremely similar to L. hamiltoni, a closely related species. Both have 2n = 18 chromosomes. Contrary to a previous report, the nucleolar organizer region and secondary constriction in L. archeyi are near the telomere of the smallest, telocentric chromosome, as in L. hamiltoni. The arm-length ratios of all chromosomes are virtually identical in the two species, expect for chromosomes 2 and 3, which show evidence of a past translocation. However, L. archeyi has much less heterochromatin than does L. hamiltoni, and, unlike L. hamiltoni, heteromorphic sex chromosomes are not discernable. These frogs demonstrate two stages in the evolution of sex-chromosome differentiation related to the extent of heterochromatin accumulation.

show abstract

Inter-specific relationships ofLeiopelma (Amphibia: Anura): Further karyological evidence

Cited by 19 publications

References 5 publications

Leiopelma pakeka,n. sp. (Anura: Leiopelmatidae), a cryptic species of frog from Maud Island, New Zealand, and a reassessment of the conservation status ofL. hamiltonifrom Stephens Island

Leiopelma pakeka,n. sp. (Anura: Leiopelmatidae), a cryptic species of frog from Maud Island, New Zealand, and a reassessment of the conservation status ofL. hamiltonifrom Stephens Island

An electrophoretic study of genetic variation in the New Zealand frog genusLeiopelma

Comparative cytogenetics of the primitive frog, <i>Leiopelma archeyi </i>(Anura, Leiopelmatidae)

Contact Info

Product

Resources

About