| use of granulated fertilizers with actellic ec 50 insecticide in the control of mosquito larvae. | granulated fertilizers [ammonium nitrate, synthetic fertilizer] were used as carriers to prepare an insecticide granulate suitable for the control of aedes cantans and aedes vexans mosquito larvae under field conditions. the insecticide granulate was obtained by mixing 1 volume unit of actellic ec 50 with 50 volume units of fertilizer. the optimal dose required to ensure and effective control of aedes mosquito larvae was 2--5 g of granulate per 1 m3 of water [i.e. 2--5 kg/ha per each 1- cm depth ... | 1981 | 6262402 |
| eag channels expressed in microvillar photoreceptors are unsuited to diurnal vision. | the principles underlying the evolutionary selection of ion channels for expression in sensory neurons are unclear. photoreceptor depolarization in the diurnal drosophila melanogaster is predominantly provided by light-activated transient receptor potential (trp) channels, whereas repolarization is mediated by sustained voltage-gated k(+) channels of the shab family. in the present study, we show that phototransduction in the nocturnal cockroach periplaneta americana is predominantly mediated by ... | 2017 | 28087896 |
| asymmetric interactions in semiaquatic insects. | interspecific interactions were studied in three coexisting species of predatory semiaquatic insects: gyrinus substriatus steph. (coleoptera), gerris lacustris (l.) and gerris argentatus schumm. (hemiptera). prey capture success was observed in trials with individuals of two different species. two prey sizes were used: fruit flies drosophila melanogaster and mediterranean flour moths ephetia kuehniella (zeller). when the two species were starved for the same period of time, g. substriatus was ge ... | 1992 | 28313709 |
| biophysical properties of photoreceptors in corixa punctata facilitate diurnal life-style. | measurement of evolutionary adaptations of a visual system to its visual and operational ecology requires comparison of visual function in different species with similar morphologies and visual ecologies, occupying the same habitats but displaying differences in visually-guided behavior. the goal here was to document the biophysical properties of photoreceptors in the lesser water boatman corixa punctata, which shares many features with the previously studied aquatic predator water boatman backs ... | 2015 | 25913025 |
| developmental changes in biophysical properties of photoreceptors in the common water strider (gerris lacustris): better performance at higher cost. | although the dependence of invertebrate photoreceptor biophysical properties on visual ecology has already been investigated in some cases, developmental aspects have largely been ignored due to the general research emphasis on holometabolous insects. here, using the patch-clamp method, we examined changes in biophysical properties and performance of photoreceptors in the common water strider gerris lacustris during postembryonic development. we identified two types of peripheral photoreceptors, ... | 2014 | 24872534 |
| antagonistic pre- and post-copulatory sexual selection on male body size in a water strider (gerris lacustris). | a crucial question in sexual selection theory is whether post-copulatory sexual selection reinforces or counteracts conventional pre-copulatory sexual selection. male body size is one of the traits most generally favoured by pre-copulatory sexual selection; and recent studies of sperm competition often suggest that large male size is also favoured by post-copulatory sexual selection. in contrast to this general pattern, this study shows that pre- and post-copulatory sexual selection act antagoni ... | 2001 | 12123301 |
| reflection-polarization patterns at flat water surfaces and their relevance for insect polarization vision | it has recently been shown that horizontally polarized ultraviolet light reflected from the surface of water is the main optical cue for habitat finding by insects living in, on, or near water. what are the polarization properties that make the skylight reflected by water attractive to flying water insects in nature? in this paper, as an approach to this problem, the patterns of the degree and direction of polarization of skylight visible over a flat water surface are computed for unpolarized li ... | 1995 | 9441813 |
| the organization of the lamina ganglionaris of the hemipteran insects, notonecta glauca, corixa punctata and gerris lacustris. | neuronal elements, i.e. first and second order neurons, of the first optic ganglion of three waterbugs, n. glauca, c. punctata and g. lacustris, are analyzed on the basis of light- and electron microscopy. eight retinula cell axons, leaving each ommatidium, disperse to different cartridges as they enter the laminar outer plexiform layer. such a pattern of divergence is one of the conditions for neuronal superposition; it is observed for all three species of waterbugs. the manner in which the rec ... | 1979 | 455401 |
| [the structure of the rhabdome in the bifunctional compound eye of the pond skater, gerris lacustris]. | | 1969 | 4901541 |