For the first time, an analysis was carried out of allozyme variability in trout (Salmo trutta) from three rivers of Iran. We studied 23 gene loci coding enzymes: glycerol-3-phosphate dehydrogenase (G3PDH), aspartate aminotransferase (AAT), malate dehydrogenase (MDH), lactate dehydrogenase (LDH), creatine kinase (CK), malic enzyme [NADP-dependent MDH] (MEP), superoxide dismutase (SOD), esterase...

Reciprocal transplant studies examined the contribution of genetic differentiation and phenotypic plasticity to intraspecific variation in blue oak (Quercus douglasii) seedling survival and growth. A nested, mixed model design partitioned seedling survival and growth responses into between-population effects, within-population (among family) effects, and environmental effects. Significant betwe...

We have sampled a London population of Drosophila melanogaster for null alleles at twenty-five allozyme loci. The same loci and biochemical techniques were used as in our previous survey of a North Carolina population (Voelker et al. 1980). This second survey is completely concordant with the first. No nulls were detected among the five X-linked loci. The mean frequency of nulls at the twenty a...

Determining insect parasitism rates is problematic due to the small size and lack of useful distinguishing morphological characters of many parasitoid taxa. To solve this problem, entomologists have employed one of four general methods to detect parasitoid protein or nucleic acid markers: serological assay; random amplified polymorphic DNA-polymerase chain reaction (RAPD-PCR); allozyme electrop...

Root-knot nematodes (genus Meloidogyne) have been the subject of recent and numerous studies of genetic variation because of the need to develop molecular diagnostics for the four globally distributed, parthenogenetic species that are significant agricultural pests. Our analysis of Meloidogyne mtDNA improves on previous studies: (i) by examining restriction site polymorphism among a large numbe...

Hotspots of intraspecific diversity have been observed in most species, often within areas of putative Pleistocene refugia. They have thus mostly been viewed as the outcome of prolonged stability of large populations within the refugia. However, recent evidence has suggested that several other microevolutionary processes could also be involved in their formation. Here, we investigate the contri...

I examined the geographic distribution of genetic variation in the livebearing freshwater fish Brachyrhaphis rhabdophora in northwestern Costa Rica as revealed by allozymes and mitochondrial DNA sequences. Allelic variability at 11 enzyme-coding loci surveyed across 12 localities revealed marked genetic differentiation among populations within drainages ( P=0.36) and among drainages within regi...

Traditional genetic markers based on allozyme variation had indicated that in Atlantic salmon the found for locus coding mMEP-2* could be adaptive, with being related to river water temperature, growth, and maturation. More recently, SNP panels used search genes maturation identified several genes, including vgll3 gene early However, none of analyses performed an association between already kno...

Mussels often hybridise to form the Mytilus species complex comprised of M. edulis and galloprovincialis as main cultivated in Europe and, where their geographical distribution overlaps, trossulus. It has been suggested that trossulus have a weaker shell than UK native hybridisation reduces farmed mussel yields overall fitness. Here, we investigate hypothesised link between weakness, employing ...

The relative importance of different modes of gene expression of viability genes contributing to inbreeding depression was investigated in the wild plant, Mimulus guttatus. Viability genes were identified by self-fertilizing 31 outbred plants, each heterozygous for three to nine unlinked allozyme markers, and analyzing segregation ratios of selfed progeny at maturity for deviations from 1:2:1 r...