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K/Ar-determinations, major and trace element chemical analyses and magnetic data are reported for rocks from Santa Maria (Azores), Madeira and Porto Santo, and Gran Canaria. Based on these data, the… Continue Reading
Dragonfly larvae catch prey by rapid protraction of a curiously modified labium. There are two main types of predatory behavior; 'climbers' move amongst aquatic vegetation and use their large compo...
Abstract Average reaction norms relating number of day-degrees required to complete egg development to temperature are described for 95 species (115 populations) of Plecoptera, Odonata,… Continue Reading
We evaluate the arguments and evidence for a terrestrial vs an aquatic origin for the Insecta. The evidence falls into three categories: (1) evidence that does not support one view more than the… Continue Reading
The family Tipulidae, comprising the subfamilies Tipulinae, Limoniinae, and Cylindrotominae (3), is the largest family in the Diptera, with 14,000 described species. A very old group of Diptera with… Continue Reading
We separate the mating systems of odonates into two main groups: non-resource and resource-based systems. These two groups comprise five classes of mating system: encounter-limited mating, free… Continue Reading
The natural food of pond-dwelling larvae has been studied by analyzing the contents of faecal pellets and comparisons are made among different species, different sizes of larvae, different habitats,… Continue Reading
Despite the abundance and ubiquity of water mites, their importance as predators in freshwater communities is seldom investigated. This neglect is likely due both to the perceived difficulty in… Continue Reading
Grylloblatta campodeiformis Walker were collected from a site in the Alberta Rocky Mountains at an altitude of 1300 m. The gut contents in the autumn consist almost entirely of arthropods. Dominant… Continue Reading