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The ultrasonic vocalizations of mice are attracting increasing attention, because they have been recognized as an informative readout in genetically modified strains. In addition, the observation that male mice produce elaborate sequences of ultrasonic vocalizations ('song') when exposed to female mice or their scents has sparked a debate as to whether(More)
We studied the development of infant baboons' (Papio cynocephalus ursinus) responses to conspecific 'barks' in a free-ranging population in the Okavango Delta, Botswana. These barks grade from tonal, harmonically rich calls into calls with a more noisy, harsh structure. Typically, tonal variants are given when the signaller is at risk of losing contact with(More)
The response of ecological communities to anthropogenic disturbance is of both scientific and practical interest. Communities where all species respond to disturbance in a similar fashion (synchrony) will exhibit large fluctuations in total biomass and dramatic changes in ecosystem function. Communities where some species increase in abundance while others(More)
The existence in the ocean of deep western boundary currents, which connect the high-latitude regions where deep water is formed with upwelling regions as part of the global ocean circulation, was postulated more than 40 years ago. These ocean currents have been found adjacent to the continental slopes of all ocean basins, and have core depths between 1,500(More)
Light stimuli from a 100-W tungsten source were filtered (neutral density and narrow-band interference filters;10 nm width; Oriel), gated by a shutter (Uniblitz VS35;Vincent Associates) and calibrated by a radiometer (S370, UDT Instruments). The irradiance of the unfiltered ('white') stimulus was (in photons s 21 cm 22): 4 £ 10 12 at 400 nm, 6 £ 10 13 at(More)
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