Members of the family Bdellidae inhabit a variety of habitats worldwide and are active predators of small arthropods_ Studies by Muma (1975) indicated that Bdella distincta (Baker & Balock) prey on eggs and crawlers of armoured scale insects on citrus in Florida, while Neomolgus capil/atus (Kramer) is associated with pasture pests from Scandinavia to Morocco (Wallace 1974). Bdellodes lapidaria ...

Water is the most limiting factor for plant growth and crop productivity (Kramer, 1983), and water-deficit stress adversely affects crop growth and yield throughout the world (Boyer, 1982). Crop yields are being reduced by drought and the increasing scarcity of water for irrigation, and changing world climatic trends may increase the severity of the problem (Le Houerou, 1996). Water availabilit...

The capacity region of the N -sender additive white Gaussian noise (AWGN) multiple access channel (MAC) with feedback is not known in general, despite significant contributions by Cover, Leung, Ozarow, Thomas, Pombra, Ordentlich, Kramer, and Gastpar. This paper studies the class of generalized linear feedback codes that includes (nonlinear) nonfeedback codes at one extreme and the linear feedba...

The goal of this brief communication is to report crosscultural data with relevance to researchers studying cooperative breeding in humans in the context of other non-human mammals. The data are derived from ethnographic research in 36 small-scale human populations/ cultural groups living on 5 continents. A number of recent accounts have described Homo sapiens as a species that practices cooper...