26 research outputs found
Model of the dynamics of the density of forest leaf-eating insects
The structure of a model of leaf-eating insects' population density dynamics is considered. The system of differential equations describing the larval stage of an oak-leaf roller (Tortrix viridana) and some results obtained by computer simulation of the larva development process, are also given. The model suggested may be used for forecasting the degree of foliage damage caused by the oak-leaf roller and for solving problems on rational control of the population density of this dangerous oak-forest pest
Reactions of N'-[2-Oxo-5-R-furan-3(2H)-ylidene]acylhydrazides with Primary and Secondary Alcohols
Synchrotron Radiation Method for Study the Dynamics of Nanoparticle Sizes in Trinitrotoluene During Detonation
Three-dimensionality of the male genitalia shape and species identification in the mosquito genus Aedes Meigen, 1818 (Diptera, Culicidae)
The first record of Late Cretaceous blackflies (Diptera: Simuliidae) in Asia (Yantardakh, Taimyr)
Synchrotron Radiation Methods for Registration of Particles Ejected from Free Surface of Shock-loaded Metals
Confirmation of the species status of the blackfly Simulium galeratum in Britain using molecular taxonomy
Since 1920 Simulium reptans (Linnaeus) (Diptera: Simuliidae) has been reported as exhibiting two different larval morphotypes, a typical S. reptans and an atypical S. reptans var. galeratum, which differ in the markings of the larval head capsule. Inconsistent variation in adults and no apparent variation in the pupae have led taxonomists to conclude that these types in Britain are a single species. We investigated populations in Britain where either the typical form or var. galeratum is found, and one population where the two exist sympatrically. A phylogenetic study based upon a region of the mitochondrial cytochrome c oxidase 1 gene (DNA barcoding) produced a tree that delineated the morphotypes into two distinct monophyletic clades. The average Kimura-2-parameter distances within each clade (i.e. within each morphotype) were very low (0.67% and 0.78%), with the distances between morphotypes being 9−10-fold greater (mean 7.06%). This is concordant with differences within and between species in other taxa; based upon the strict correlation between the molecular variation and the morphotypes, we propose the re-instatement of S. galeratum to species status