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William A. Searcy Susan Peters Silke Kipper Stephen Nowicki 《Behavioral ecology and sociobiology》2010,64(8):1343-1349
One explanation for why female songbirds attend to male song is that the quality of a male's song is associated with the quality
of his developmental history. We tested this hypothesis by playing back to female swamp sparrows (Melospiza georgiana) songs recorded from males of either inferior or superior developmental histories, as assessed by their rates of mass gain
during the first 18 days post-hatching. Females showed significantly higher levels of courtship display in response to songs
of males with superior growth than to songs of males with inferior growth. Out of nine song traits measured, only song duration
correlated with variation in female response; duration was also the only trait that differed significantly in univariate comparisons
between the superior growth songs and the inferior growth songs. In a multivariate analysis, however, inferior growth songs
were best discriminated from superior growth songs by combining three song traits: trill rate, stereotypy, and the number
of notes per syllable. We suggest that early developmental stress degrades song in many small ways, and that it is the cumulative
effect of the resulting deficits that explains lower female response. 相似文献
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Andreas Johansson Evalena Blomqvist Annika Ekvall Lennart Gustavsson Claes Tullin Bengt-Ake Andersson Mattias Bisaillon Tisse Jarlsvik Anders Assarsson Gunnar Peters 《Waste management & research》2007,25(3):296-300
This paper briefly describes waste treatment trends in Sweden and describes an example of state-of-the-art treatment in a local integrated waste treatment system (Bor?s). The focus is on treatment of household waste, to illustrate what can be done to establish a sustainable waste treatment system with high recovery of materials and energy. The various processes have resulted in a low amount of landfilled household waste, and high proportions of recovered energy and materials. Heat, electricity, vehicle fuel and fertilizers, metals and construction materials are recovered from the local waste in Bor?s, with less than 4% of domestic waste being sent to landfill. 相似文献
229.
A. R. Tucker J. F. Carr J. E. Peters 《Journal of the Air & Waste Management Association (1995)》2013,63(12):1614-1618
An experimental multitube cyclone facility was constructed and experiments conducted to investigate the influence of hopper evacuation on multitube cyclone performance. The effects of the amount of hopper evacuation and the location of hopper evacuation on individual cyclone tube velocities and particle collection efficiency were determined. Cyclone tube velocities increased with increasing hopper evacuation although hopper evacuation location had little effect on the velocities. Particle collection efficiencies were increased from 89.5 percent to approximately 95 percent with 14 percent hopper evacuation from a location near the center of the hopper. Other hopper evacuation locations were not as effective in increasing collection efficiency. These results suggest that, while the increased velocity in the cyclone tubes is an important effect in the improvement of multitube cyclone performance with hopper evacuation, other factors such as redistribution of gas flow within the hopper are also important. 相似文献
230.
Concentrations of steroids and inorganic ions were measured in waste water of an aerated sand trap as well as in aerosol particles emitted from this tank at the waste water treatment plant (WWTP) of Bayreuth, Germany, in January and February 2003. The investigations comprised seven sterols, two estrogens, and several inorganic ions. Since an appropriate method for the determination of sterols in waste water was not available, a new method based on solid phase extraction was developed. The concentrations of the sterols coprostanol and cholesterol amounted to 30-180 microg l(-1) in waste water and to 400-5000 pg m(-3) in aerosol particles. All other sterols were present in markedly lower concentrations. The mean concentrations of the two estrogens estrone and 17beta-estradiol were about 165 pg m(-3) in aerosol particles. The steroid concentrations in both waste water and aerosol particles varied greatly over time, however with the exception of coprostanol, no clear correlation was detected between concentrations in waste water and aerosol particles. 相似文献