Patterns of Allozymic Similarity in Ecologically Central and Marginal Populations of Hordeum jubatum in Utah

Shumaker, Kathy M.; Babble, Gary R.

doi:10.2307/2408319

Cited by 36 publications

(28 citation statements)

References 12 publications

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“…Central populations of widespread species may inhabit a variety of habitats and could be more variable than marginal populations (Bantock and Price, 1975;Shumaker and Babble, 1980). Owing to the fact that the eight population studied are closely located, the possible explanation for the higher intrapopulation variation patterns revealed in this study is that these populations were collected from near the central or founding population, similar to studies on E. fibrosus (Díaz et al, 2000) and E. trachycaulus (Gaudett et al, 2005).…”

Section: Genetic Structure Of Populationssupporting

confidence: 67%

RAPD analysis of genetic diversity and population structure of Elymus sibiricus (Poaceae) native to the southeastern Qinghai-Tibet Plateau, China

Chen²,

Bai³

et al. 2012

Genet. Mol. Res.

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ABSTRACT. Genetic diversity of Elymus sibiricus (Poaceae) was examined in eight populations from the southeast Qinghai-Tibet Plateau. We detected 291 RAPD polymorphic loci in 93 samples. The percentage of polymorphic bands (PPB) was 79%. Genetic diversity (H E ) was 0.264, effective number of alleles (N E ) was populations per generation (N m ) was 1.06. The populations were found to share high levels of genetic identity. No significant correlation was found between geographic distance and pairwise genetic distance (r = 0.7539, P = 0.9996). Correlation analysis revealed a significant correlation (r = 0.762) between RAPD H E found in this study and ISSR H E values from a previous study.

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Section: Genetic Structure Of Populationssupporting

confidence: 67%

RAPD analysis of genetic diversity and population structure of Elymus sibiricus (Poaceae) native to the southeastern Qinghai-Tibet Plateau, China

Chen²,

Bai³

et al. 2012

Genet. Mol. Res.

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“…In the North American boreal forest, the effects of forest practises on bryophyte and lichen communities are comparatively little studied (but see Selva 1994, Webb 1996, Crites and Dale 1997, Newmaster et al 1999, Pharo and Vitt 2000. iii) Ecologically marginal species are plants growing beyond the expected range of soil, climate, or successional conditions for the species (Schumaker and Babble 1980). Such plants can be found on every tract of forest land and often are vulnerable to disturbance.…”

Section: Indicator Species or Species Group Responsesmentioning

confidence: 99%

“…-common in colder and warmer climatic regimes, respectively -were extirpated by clearcutting either because they were directly uprooted and lacked the means to recolonize, or because environmental conditions in the open were too physiologically stressful. Small populations of ecologically marginal plants contribute to the richness of a site and potentially to the genetic diversity of the species (Soulé 1973, Schumaker andBabble 1980). However, disturbance also creates opportunities for new colonization by marginal species (Swindel et al 1984).…”

Section: Indicator Species or Species Group Responsesmentioning

confidence: 99%

Silvicultural disturbance severity and plant communities of the southern Canadian boreal forest

Haeussler¹,

Bedford²,

Leduc³

et al. 2002

Silva Fenn.

133

115

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Boreal forest ecosystems are adapted to periodic disturbance, but there is widespread concern that conventional forest practises degrade plant communities. We examined vegetation diversity and composition after clearcut logging, mechanical and chemical site preparation in eight 5-to 12-yr old studies located in southern boreal forests of British Columbia and Quebec, Canada to fi nd useful indicators for monitoring ecosystem integrity and to provide recommendations for the development and testing of new silvicultural approaches. Community-wide and species-specifi c responses were measured across gradients of disturbance severity and the results were explained in terms of the intermediate disturbance hypothesis and a simple regeneration model based on plant life history strategies. Species richness was 30 to 35% higher 5 to 8 years after clearcut logging than in old forest. Total and vascular species diversity generally peaked on moderately severe site treatments, while non-vascular diversity declined with increasing disturbance severity. On more-or-less mesic sites, there was little evidence of diversity loss within the range of conventional silvicultural disturbances; however, there were important changes in plant community composition. Removing soil organic layers caused a shift from residual and resprouting understory species to ruderal species regenerating from seeds and spores. Severe treatments dramatically increased non-native species invasion. Two important challenges for the proposed natural dynamics-based silviculture will be 1) to fi nd ways of maintaining populations of sensitive non-vascular species and forest mycoheterotrophs, and 2) to create regeneration niches for disturbance-dependent indigenous plants without accelerating non-native species invasion.

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“…- Table 2 shows the frequencies of allozyme phenotypes at the seven zones of enzyme activity which were polymorphic in these populations. Four zones, ACPH, APX, CPX-2 and MDH were monomorphic, although variants at CPX-2 and MDH have been found in other populations of this species (Shumaker, 1977). The table also gives values of the weighted average amount of polymorphism, P, per population at the polymorphic zones calculated as in Marshall and Allard (1970 Allozymic similarity.-The genotypic similarity measure of Hedrick (1971) was calculated, using the polymorphic zones, for all pairwise combinations of these populations.…”

Section: Resultsmentioning

confidence: 99%