To achieve sustainable fisheries implies that resources’ management is carried out in accordance with biologically and ecologically relevant processes. In this context, to infer the boundaries of genetic stocks along their distribution crucial avoid depletion diversity induced by fishing pressure. Despite its remarkable ecological role commercial interest, there are still many uncertainties abo...

Abstract We use Helianthemum oelandicum subsp. as a model for studies of mechanisms shaping the diversity in rapidly radiating lineage H. aggregate. Locally, correlations between drainage conditions (using GIS to measure variation micro-topography on more or less horizontal bedrock) and frequency alleles Mendelian genes pubescence indicated that hairs are markers adaptation unique environmental...

The isocitrate dehydrogenase-2 (Idh-2) locus of Anopheles quadrimaculatus was analyzed genetically and the enzyme was characterized physiochemically. Three-point testcrosses involving chromosome 3 markers showed that in female hybrids the gene sequence and the map distances are: nonstripe (st)--6.8--Idh-2--43.5--short antenna (Sa). Reduced recombination frequencies were observed in male hybrids...

A hybrid zone involving the deep-sea mussels, Bathymodiolus azoricus and B. puteoserpentis, was recently discovered at Broken Spur hydrothermal vent field (29 degrees 10' N, 43 degrees 10' W) along an intermediate segment of the Mid-Atlantic Ridge axis. Examination of nuclear (allozymes) and cytoplasmic (mitochondrial DNA) gene markers in a new sample from Broken Spur revealed significant cyton...

Drosophila melanogaster populations that exhibit constrasting life histories as a result of laboratory selection were compared at several potentially relevant enzyme loci. Selection regimes included postponed reproduction, accelerated development, and intermediate generation time. Each selection regime was represented by fivefold replicated populations maintained for between 50 and 500 generati...

Sequential polyacrylamide electrophoresis has revealed 20 allozymes of xanthine dehydrogenase (XDH) in Drosophila pseudoobscura. DNA sequence determination of seven isolates of the Xdh locus that represent six allozyme classes are presented here. Of the 5,456 sites examined, 180 are polymorphic, with 27 polymorphisms occurring at nonsynonymous, or replacement, sites. An average of nine amino ac...

The eastern newt, Notophthalmus viridescens, is widely distributed in eastern North America and has been divided into four subspecies. These subspecies differ geographically in morphology and life history, suggesting that the subspecies represent locally adapted and differentiated entities between which gene flow is significantly reduced. We investigated the relationships among subspecies by as...

The Hokkaido salamander (Hynobius retardatus) is endemic to Hokkaido Island, Japan, and shows intriguing flexible phenotypic plasticity and regional morphological diversity. However, to date, allozymes and partial mitochondria DNA sequences have provided only an outline of its demographic histories and the pattern of its genetic diversification. To understand the finer details of the population...