The mating system and genic diversity in Martínez spruce, an extremely rare endemic of México's Sierra Madre Oriental: an example of facultative selfing and survival in interglacial refugia

Ledig, F. Thomas; Bermejo-Velázquez, Basilio; Hodgskiss, Paul D.; Johnson, David R.; Flores-López, Celestino; Jacob-Cervantes, Virginia

doi:10.1139/cjfr-30-7-1156

Revue canadienne de recherche forestière

2000

DOI: 10.1139/cjfr-30-7-1156

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The mating system and genic diversity in Martínez spruce, an extremely rare endemic of México's Sierra Madre Oriental: an example of facultative selfing and survival in interglacial refugia

F. Thomas Ledig¹,

Basilio Bermejo-Velázquez²,

Paul D. Hodgskiss³

et al.

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Cited by 21 publications

(31 citation statements)

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“…After further observation, Patterson (1988) decided that P. martinezii was suf ciently different from P. chihuahuana in needles, pulvini, and margins of the cone scales to name it a new species. More recently, we have recorded a few new populations of P. martinezii (Ledig et al 2000b) in addition to the original discoveries by Mü ller-Using and Alan ‡s-Flores (1984).…”

mentioning

confidence: 72%

“…1). Four of the six are relicts, based on fossil evidence or biogeography, and are now rare endemics (Wolfe 1964;Lozano-Garc ‡a 1993;Ledig et al 2000b); i.e., P. martinezii, P. chihuahuana, P. mexicana Mart ‡nez (Mexican spruce), and P. breweriana S. Wats. (Brewer spruce).…”

mentioning

confidence: 99%

“…(Brewer spruce). In all of the three Mexican species, trees number only in the hundreds to thousands (Ledig et al 2000b). Because of their rarity, few studies of any kind have been published on P. breweriana, P.…”

mentioning

confidence: 99%

“…1. The natural distributions of P. engelmannii, P. pungens, P. breweriana, P. chihuahuana, P. martinezii, and P. mexicana in western North America (after Little 1971, Grif n and Critch eld 1976, and Ledig et al 2000b, with location of sampling sites used for DNA markers: P. chihuahuana (Ch), P. martinezii-Cañ on el Butano (EB) and La Tinaja (LT); P. mexicana-Sierra el Coahuiló n (SC), Sierra la Marta (SM), and Cerro Mohinora (CM); Picea engelmannii (E); P. pungens (Pu); P. breweriana (Br).…”

mentioning

confidence: 99%

“…Within this range, however, it occurs only in scattered populations that range in size from 11 to 2,342 trees $ 10 cm diambreast-high (Ledig et al 2000b). Populations differ extensively in allele frequency as a result of random genetic drift, suggesting their relictual status (Ledig et al 1997). Based on pollen evidence, Picea spp.…”

mentioning

confidence: 99%

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Relationships among the Spruces (Picea, Pinaceae) of Southwestern North America

et al. 2004

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confidence: 72%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Relationships among the Spruces (Picea, Pinaceae) of Southwestern North America

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Genetic consequences of fragmentation in “arbor vitae,” eastern white cedar (Thuja occidentalis L.), toward the northern limit of its distribution range

Tremblay

Bergeron

et al. 2012

Ecology and Evolution

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We tested the hypothesis that marginal fragmented populations of eastern white cedar (EWC) are genetically isolated due to reduced pollen and gene flow. In accordance with the central-marginal model, we predicted a decrease in population genetic diversity and an increase in differentiation along the latitudinal gradient from the boreal mixed-wood to northern coniferous forest. A total of 24 eastern white cedar populations were sampled along the north-south latitudinal gradient for microsatellite genotyping analysis. Positive Fis values and heterozygote deficiency were observed in populations from the marginal (Fis = 0.244; PHW = 0.0042) and discontinuous zones (Fis = 0.166; PHW = 0.0042). However, populations from the continuous zone were in HW equilibrium (Fis = −0.007; PHW = 0.3625). There were no significant latitudinal effects on gene diversity (Hs), allelic richness (AR), or population differentiation (Fst). Bayesian and NJT (neighbor-joining tree) analyses demonstrated the presence of a population structure that was partly consistent with the geographic origins of the populations. The impact of population fragmentation on the genetic structure of EWC is to create a positive inbreeding coefficient, which was two to three times higher on average than that of a population from the continuous zone. This result indicated a higher occurrence of selfing within fragmented EWC populations coupled with a higher degree of gene exchange among near-neighbor relatives, thereby leading to significant inbreeding. Increased population isolation was apparently not correlated with a detectable effect on genetic diversity. Overall, the fragmented populations of EWC appear well-buffered against effects of inbreeding on genetic erosion.

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Process to extinction and genetic structure of a threatened Japanese conifer species,Picea koyamae

Katsuki

Shimada

Yoshimaru

2011

Journal of Forest Research

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Since the end of the glacial age, Picea koyamae has been sparsely distributed in Japan as a relict species and is presently threatened with extinction. We investigated the population structure and genetic structure of nine populations of P. koyamae. Population size was assessed at 9-135 individuals in habitats ranging from 0.5 to 11.5 ha, and seedlings and saplings were observed in all but one particular population, which had a Sasa-type (bamboo grass) forest floor. The effective number of alleles per locus (N e ) within peripheral populations in the Yatsugatake Mountains was 1.8-2.7, much lower than that of core populations in the Akaishi Mountains (2.8-4.3) using five nuclear simple sequence repeat loci. This finding suggests that genetic variation in these populations has been reduced by isolation from other populations. The standardized genetic differentiation among populations (G 0 ST ) was 0.410 and higher than that found in other Japanese conifers, suggesting that isolation and inbreeding have progressed in this species. In two isolated populations at the Yatsugatake Mountains, the fixation index (F IS ) was 0.315-0.354, much higher than the values determined for the other populations (-0.188 to 0.263). This suggests that these two populations have survived several generations while increasing the degree of inbreeding. However, the highest seedling density was in a population with low genetic variation and high F IS . The most serious problems at present appear to be the declining number of mature trees and the deterioration of suitable environments for seedling establishment.

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The mating system and genic diversity in Martínez spruce, an extremely rare endemic of México's Sierra Madre Oriental: an example of facultative selfing and survival in interglacial refugia

Cited by 21 publications

References 43 publications

Relationships among the Spruces (Picea, Pinaceae) of Southwestern North America

Relationships among the Spruces (Picea, Pinaceae) of Southwestern North America

Genetic consequences of fragmentation in “arbor vitae,” eastern white cedar (Thuja occidentalis L.), toward the northern limit of its distribution range

Process to extinction and genetic structure of a threatened Japanese conifer species,Picea koyamae

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