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High Heterozygosity (high + heterozygosity)
Selected AbstractsSize asymmetry in intraspecific competition and the density-dependence of inbreeding depression in a natural plant population: a case study in cassava (Manihot esculenta Crantz, Euphorbiaceae)JOURNAL OF EVOLUTIONARY BIOLOGY, Issue 1 2006B. PUJOL Abstract The effects of competition on the genetic composition of natural populations are not well understood. We combined demography and molecular genetics to study how intraspecific competition affects microevolution in cohorts of volunteer plants of cassava (Manihot esculenta) originating from seeds in slash-and-burn fields of Palikur Amerindians in French Guiana. In this clonally propagated crop, genotypic diversity is enhanced by the incorporation of volunteer plants into farmers' stocks of clonal propagules. Mortality of volunteer plants was density-dependent. Furthermore, the size asymmetry of intraspecific competition increased with local clustering of plants. Size of plants was correlated with their multilocus heterozygosity, and stronger size-dependence of survival in clusters of plants, compared with solitary plants, increased the magnitude of inbreeding depression when competition was severe. The density-dependence of inbreeding depression of volunteer plants helps explain the high heterozygosity of volunteers that survive to harvest time and thus become candidates for clonal propagation. This effect could help favour the maintenance of sex in this ,vegetatively' propagated crop plant. [source] Atlantic capelin (Mallotus villosus) tetranucleotide microsatellitesMOLECULAR ECOLOGY RESOURCES, Issue 2 2005K. GORDOS Abstract Twelve microsatellite loci developed for Atlantic capelin (Mallotus villosus) using magnetic bead hybridization enrichment for tetranucleotide microsatellites revealed five loci composed of single repeat elements and six composed of complex repeats. Forty-four beach-spawning females from three different northwestern Atlantic Newfoundland beach-spawning populations were screened at each locus. Loci were polymorphic (two to 59 alleles per locus) and all but two exhibited high heterozygosity (0.86,1). The loci are considered suitable for addressing questions related to fine-scale population structure, spawning fidelity and survivorship/kinship issues. [source] Cross-amplification of polymorphic microsatellites reveals extra-pair paternity and brood parasitism in Sturnus vulgarisMOLECULAR ECOLOGY RESOURCES, Issue 1 2005A. LOYAU Abstract We tested the cross-amplification of 37 microsatellites in a population of starlings (Sturnus vulgaris). Twenty-three of them amplified and five exhibited a large number of alleles per locus and high heterozygosity (on average: 14.6 alleles/locus and HE = 0.704). We assessed the occurrence of extra-pair paternity (EPP) and intraspecific brood parasitism (IBP) in this population. The EPP rate was 16% to 18% offspring from 43% to 45% of nests. IBP was very variable between two successive years (14% to 27% chicks from 25% to 64% of clutches). These five polymorphic markers will be of potential use in studies of genetic diversity, population structure and reproductive strategy of this species. [source] Isolation and characterization of novel microsatellite markers from the Australian water skink Eulamprus kosciuskoi and cross-species amplification in other members of the species-groupMOLECULAR ECOLOGY RESOURCES, Issue 1-2 2001Ian A. W. Scott Abstract A panel of six samples from three Eulamprus species was used to screen 24 primer pairs developed from the Australian water skink Eulamprus kosciuskoi. We provide details of 10 microsatellite loci that exhibited the cleanest and strongest banding patterns. We also screened six of these microsatellite loci against 118 individuals from a population of E. heatwolei. These microsatellites exhibited large numbers of alleles per locus (4,19) and high heterozygosity (0.271,0.898) in this population. This suggests that they will be extremely useful for investigating mating systems and other facets of population biology in these lizards. [source] | ||||||||||