Abstract An important goal of marine population genetics is to understand how spatial connectivity patterns are influenced by historical and evolutionary factors. In this study, we evaluate the demographic history structure Littoraria flava, a highly dispersive gastropod in Brazilian intertidal zone. To test hypotheses that species has (1) historically high levels gene flow on macrogeographical...

A novel actinomycete, strain W6(T), was isolated from a soil sample of Yunnan Province, China. The bacterium was aerobic, non-motile, non-spore-forming and Gram-stain-positive. Genetic, phenotypic and chemical properties of the isolate were studied. 16S rRNA gene sequence data suggested that the novel isolate belonged to the genus Friedmanniella and shared 98.6% sequence similarity with Friedma...

The area of overlapping ranges, contact and relationships two closely related species—the western yellow wagtail Motacilla flava Linnaeus, 1758 the yellow-headed lutea (Gmelin, 1774)—in Volga region are subject present study. At present, under conditions wide sympatry, there is spatial reproductive interaction between these wagtails. Crossbreeding species ‘yellow’ wagtails gives a light-headed ...

The Holarctic genus Piezura Rondani (Diptera, Fanniidae) is reviewed. Phylogenetic relationships among the species in this group, as well as the biogeography of these species, are discussed on the basis of a cladistic analysis. Piezura graminicola shanxiensis Xue, Wang and Wu, 1998 is redescribed and elevated to species rank based on comparison of its morphology and phylogenetic relationships. ...

The individual and interactive effects of environmental pH (7 [control], 6, 5, and 4) and calcium (0, 5, and 50 mg/L) were studied on hemolymph ions (pH, Ca(2+), total CO(2), Na(+), K(+)) and osmolality in the freshwater snail, Elimia flava, over a 72-h exposure. All hemolymph factors strongly differed with environmental pH. Snails exposed to pH 4 were inactive and experienced more dramatic ion...