Are Multiple Infections More Severe for Purple Martins (Progne Subis) Than Single Infections?
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چکیده
منابع مشابه
Mixed-genotype infections of the rodent malaria Plasmodium chabaudi are more infectious to mosquitoes than single-genotype infections.
Interactions between parasite genotypes sharing a host are poorly understood, but have important consequences for the epidemiology and evolution of the parasite. In mixed-genotype malaria infections, patterns of asexual replication and transmission favoured by natural selection may be different from those in single-genotype infections. The infectivity to mosquitoes of mixed-genotype and single-...
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In this paper, we demonstrate that when a peripheral object is foveated by a sequence of multiple saccades, the initial saccade in the sequence is initiated markedly faster than a single accurate saccade to the same object. We suggest that multiple saccades represent a more automatic form of oculomotor planning that may be the result of a reduced influence from the cerebral cortex. To test this...
متن کاملPurple Martins in Oak Woodlands
Purple martins are cavity-nesting swallows that once nested fairly widely in California’s oak woodlands but are now rare in that habitat. The old oaks of the Tehachapi Range (southern Sierra Nevada) may now host the last martins that nest in oak woodlands, with approximately 100-200 pairs or about 15 percent of the California population. In summer of 2000, we found 57 nests in 46 valley and blu...
متن کاملStrains of Streptococcus pyogenes from severe invasive infections bind HEp2 and HaCaT cells more avidly than strains from uncomplicated infections.
Epidemiologically unrelated Streptococcus pyogenes strains isolated from blood, throat, and skin were assayed for adherence to HEp2 and HaCaT cells. Invasive isolates showed significantly higher avidity for these cell lines than isolates from skin and throat. In general, S. pyogenes showed greater binding to HaCaT cells than to HEp2 cells.
متن کاملAre invasive fire ants kept in check by native aerial insectivores?
Aerial predator-prey interactions may impact populations of many terrestrial species. Here, we use altitude loggers to study aerial foraging in a native insectivore, the purple martin (Progne subis), in the southern USA. Purple martins fed primarily on mating queens and males of the invasive red imported fire ant (Solenopsis invicta), and doubled their foraging efficiency by doing so. Across th...
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ژورنال
عنوان ژورنال: The Auk
سال: 2006
ISSN: 1938-4254,0004-8038
DOI: 10.1093/auk/123.1.141