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Effects of livestock grazing on rangeland grasshopper (Orthoptera: Acrididae) abundance
The results suggest that grazing management could be used to reduce pest grasshopper densities and to reduce habitat quality for grasshoppers by reducing food availability and by altering microclimate and potential oviposition sites. Expand
Trail Patterns and Movement of Workers Among Nests in the Ant Formica Obscuripes (Hymenoptera: Formicidae)
In ants of the genus Formica, intraspecific interactions among workers from different nest mounds vary from mutual tolerance to aggression and territoriality. For example, workers of FormicaExpand
Density‐dependent mating tactics in the Grey hairstreak, Strymon melinus (Lepidoptera: Lycaenidae)
Male Grey hairstreak butterflies employed two different tactics, centred on palo verde trees growing on hilltops in central Arizona. During much of the spring flight season of about four monthsExpand
Patterns of vegetation and grasshopper community composition
Results from undisturbed habitats showed that plant and grasshopper species composition changed over observed environmental gradients and suggested that habitat type influenced not only species presence, but also relative abundance. Expand
Territorial behaviour in males of three North American species of bumblebees (Hymenoptera: Apidae, Bombus)
The behaviour of males of the bumblebees Bombus nevadensis nevadensis, B. griseocollis, and B. rufocinctus was examined at sites in Colorado and Montana, U.S.A. Males of all three species defended ...
Oocyte size, egg index, and body lipid content in relation to body size in the solitary bee Megachile rotundata
The hypothesis that female body size is correlated with the body lipid content at adult emergence, the time during which oocyte growth accelerates is tested and significant correlations of body size with oocyte size variables are found. Expand
Ovarian egg size and number in relation to female size in five species of parasitoid wasps
There are significant positive correlations between female body size and both the number and the size of the mature oocytes present in the ovaries within five species of parasitoid wasps of the families Pteromalidae and Tiphiidae. Expand