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Nov
30
2009
Biologists use auditory cues to gauge bird population size
Viagra, By recording and analyzing the chatter of birds in a forest, a research team has devised a new way to calculate avian population density – and the method could be extended to other vocal animals such as whales.
The researchers used a four-microphone array to record the sound of male ovenbirds (Seiurus aurocapilla) at 75 different spots in a Maryland forest. Team members then picked out the singing of individual birds from each recording, Iowa IA . Generic viagra, With further modelling and analysis, they determined that the density of singing male ovenbirds was about 0.19 birds per hectare.
The estimate roughly agrees with the population density range predicted by capturing and banding the birds, order viagra no rx, Ordering viagra without prescription, the authors report in the Journal of Applied Ecology. The acoustic method has some advantages over trapping, ordering viagra online legally, παραγγείλετε online viagra, they say, because it is more precise, cheap viagra tablets, Billiga viagra apotek, takes less fieldwork, and doesn’t disturb the birds as much, price of viagra. Buy viagra, And the technique could be used to monitor other elusive – but talkative – species. – Roberta Kwok
Source: Dawson, Indiana IN Ind. , Order viagra no prescription, D., & Efford, Florida FL Fla. , Ohio OH , M. (2009), For viagra online. Købe viagra online, Bird population density estimated from acoustic signals Journal of Applied Ecology DOI: 10.1111/j.1365-2664.2009.01731.x
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