Conservation genetics of the endangered endemic Hawaiian genus <i>Brighamia</i> (Campanulaceae)

Gemmill, Chrissen E. C.; Ranker, Tom A.; Ragone, Diane; Perlman, Steven P.; Wood, Kenneth R.

doi:10.2307/2446437

Cited by 57 publications

(50 citation statements)

References 43 publications

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“…In a recent survey, the sharing of 14 of the 25 total alleles detected in five Canarian taxa of Cistus (Batista et al, 2001) was used to support the close phylogenetic relationship among them. Similarly, a close relatedness between two Brighamia species from Hawaii was inferred from their sharing of only six alleles out of 22 (Gemmill et al, 1998).…”

Section: Genetic Relationships Within Among Speciesmentioning

confidence: 99%

Allozyme variation and structure of the Canarian endemic palm tree Phoenix canariensis (Arecaceae): implications for conservation

2004

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Electrophoretic analysis of 18 allozyme loci was used to estimate the levels and structuring of genetic variation within and among natural populations of the protected endemic palm species from the Canary Islands (Phoenix canariensis) to evaluate its genetic relationship with the widespread congener P. dactylifera, and to assess comparatively the genetic variation in the populations where the two species coexist with morphologically intermediate plants (mixed populations). Our survey revealed that the within-population component explains roughly 75% of the genetic variation levels detected in P. canariensis (A ¼ 1.59; P ¼ 41.8; He ¼ 0.158), which rank higher than those reported for other species of the Arecaceae. A Principal Component analysis (PCA) based on allele frequencies consistently separates populations of P. canariensis and P. dactylifera, and reveals a close genetic relationship between P. canariensis and the mixed populations. Reduced levels of genetic variation in P. canariensis with respect to P. dactylifera, the fact that the genetic makeup of the Canarian endemic (with no unique alleles) is a subset of that found in P. dactylifera, and the high genetic identity between both species strongly suggest that P. canariensis is recently derived from a common ancestor closely related to P. dactylifera.

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Section: Genetic Relationships Within Among Speciesmentioning

confidence: 99%

Allozyme variation and structure of the Canarian endemic palm tree Phoenix canariensis (Arecaceae): implications for conservation

2004

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“…japonica (Kikuchi and Isagi 2002), and the Hawaiian Brighamia insignis (Gemmill et al 1998). These findings have important implications for conservation of biodiversity.…”

Section: Implication Of the Genetic Information For Conservationmentioning

confidence: 99%

Strong genetic differentiation of the East-Himalayan Megacodon stylophorus (Gentianaceae) detected by Inter-Simple Sequence Repeats (ISSR)

Zhang

Yuan

et al. 2005

Biodivers Conserv

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Abstract. Megacodon stylophorus (Clarke) Smith is a perennial alpine herb endemic to the species-rich eastern Himalayan region. Its populations are locally scattered as isolated patches throughout this region. Genetic variation within and among six populations of this species was assessed using ISSR fingerprinting with 13 primers. High levels of genetic diversity exist within species (P ¼ 69.83%, H T ¼ 0.1949 and H sp ¼ 0.3047), while the within-population diversity is low (P ¼ 11.21%, H E ¼ 0.0532 and H pop ¼ 0.0792). Extraordinarily high levels of genetic differentiation were detected among populations based on various statistics, including Nei's genetic diversity analysis (72.7%), Shannon's diversity index (74.01%) and AMOVA (80.70%). That is, populations shared low levels of genetic identity (I ¼ 0.8203 AE 0.0430). This genetic structure was probably due to severe genetic drift of the small-sized patchy populations resulting from postglacial habitat fragmentations. The observed genetic structure of the populations implies that as many populations as possible should be considered for any in situ and ex situ conservation practice on this species.

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“…A number of studies document that species become rare and endangered due to habitat loss, small population size and increased isolation of disjunct populations, or due to the detrimental impact of non-native animals and plants (Gemmill et al, 1998). Attempts to generalize these studies have been made repeatedly, but there are numerous exceptions and confounding factors that impede such endeavours (Karron, 1987;Hamrick and Godt, 1996;Gitzendanner and Soltis, 2000;Godt and Hamrick, 2001).…”

Section: Introductionmentioning

confidence: 99%

Distribution of genetic diversity among disjunct populations of the rare forest understory herb, Trillium reliquum

Gonzales

Hamrick

2005

Heredity

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We assessed genetic diversity and its distribution in the rare southeastern US forest understory species, Trillium reliquum. In all, 21 loci were polymorphic (P S ¼ 95.5%) and the mean number of alleles per polymorphic locus was 3.05. However, genetic diversity was relatively low (H es ¼ 0.120) considering the level of polymorphism observed for this outcrossing species. A relatively high portion of the genetic diversity (29.7%) was distributed among populations. There was no relationship between population size and genetic diversity, and we did not detect significant inbreeding. These results are best explained by the apparent self-incompatibility of this species, its longevity and clonal reproduction. To address questions regarding the history of T. reliquum's rarity, we compared results for T. reliquum with that of its more common and partially sympatric congener, T. cuneatum.Despite shared life history traits and history of land use, we observed significant genetic differences between the two species. Although T. cuneatum contains slightly lower polymorphism (P s ¼ 85%), we detected significantly higher genetic diversity (H es ¼ 0.217); most of its genetic diversity is contained within its populations (G ST ¼ 0.092). Our results suggest that not only is there little gene flow among extant T. reliquum populations, but that rarity and population isolation in this species is of ancient origins, rather than due to more recent anthropogenic fragmentation following European colonization. The Chattahoochee River was identified as a major barrier to gene exchange. Heredity (2005) 95, 306-314.

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Conservation genetics of the endangered endemic Hawaiian genus Brighamia (Campanulaceae)

Cited by 57 publications

References 43 publications

Allozyme variation and structure of the Canarian endemic palm tree Phoenix canariensis (Arecaceae): implications for conservation

Allozyme variation and structure of the Canarian endemic palm tree Phoenix canariensis (Arecaceae): implications for conservation

Strong genetic differentiation of the East-Himalayan Megacodon stylophorus (Gentianaceae) detected by Inter-Simple Sequence Repeats (ISSR)

Distribution of genetic diversity among disjunct populations of the rare forest understory herb, Trillium reliquum

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