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Nov

30

2009
 
 

Cheapest Viagra Prices




Biologists use auditory cues to gauge bird population size


Listening Cheapest viagra prices, 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, free viagra. Viagra online santa fe capital, 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, halvalla viagra apteekki, Bio-viagra pfizer mexico, the authors report in the Journal of Applied Ecology. The acoustic method has some advantages over trapping, viagra fast shipping, Kjøpe viagra online, they say, because it is more precise, buy valium and viagra online, Viagra shop in riyad, takes less fieldwork, and doesn’t disturb the birds as much, can i get viagra by regular mail to canada. Viagra free trial sample, And the technique could be used to monitor other elusive – but talkative – species. – Roberta Kwok

Source: Dawson, free trial viagra in canada, Viagra email updates, D., & Efford, viagra, Viagra st john's NL, M. (2009), is it legal to take viagra with you to thailand. Bird population density estimated from acoustic signals Journal of Applied Ecology DOI: 10.1111/j.1365-2664.2009.01731.x

Image © lucato, iStockPhoto.com

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Feb

27

2007
 
 

Thai surprise



A reed warbler like this, perhaps?Missing bird shows up again after 139 year absence The large-billed reed warbler Acrocephalus orinus, known only from a single bird caught in India in 1867, has finally reappeared, this time in Thailand. According to the recently published findings of a team of surprised ornithologists, led by Philip Round at Mahidol University, Bangkok, the bird was trapped during field work at the Laem Phak Bia Environmental Research and Development Project, a whopping 3100 km from where it was last recorded. DNA analysis on a “donated” tail feather confirmed the bird’s identity and allowed the scientists to take a stab at estimating the global population size. There could be between 26 and 40 breeding birds left in the wild, although some big assumptions had to be made to arrive at those figures. Not believing the old adage, Pound’s team released their captive, hoping that there are indeed more out there in the bush. Source: Round PD, Hansson B, Pearson DJ, Kennerley PR & Bensch S (2007) Lost and found: the enigmatic large-billed reed warbler Acrocephalus orinus rediscovered after 139 years. Journal of Avian Biology DOI: 10.1111/j.2007.0908-8857.04064.x Image © Iurii Konoval (NB: It's not Acrocephalus orinus!) Related story: click here (subscription required)

Filed Under Endangered species, Monitoring | Leave a Comment

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Jan

29

2007
 
 

Stuff the cuckoo



Cuckoo chick -- big bird!New Zealand’s introduced birds no longer recognize nest parasites Being away from one’s enemies isn’t always a good thing: recognizing the bad guys usually means being familiar with them too. Katrina Hale and James Briskie, both at the University of Canterbury, Christchurch, provide a striking case in point this week. The European song thrush, blackbird and chaffinch got lucky the day European settlers decided to take them to New Zealand, because they were freed from the unwanted attentions of the cuckoo Cucuclus canorus. And how quickly they’ve forgotten their old adversary! In less than 140 years since their introduction to the islands, all three species have lost their aggressive response to the presence of a cuckoo at the nest. Whereas their European counterparts will readily attack an intruder, Hale and Briskie found that the New Zealand birds barely gave a stuffed cuckoo a second glance. They were much better at spotting model “eggs”: however, that could be down to the researchers’ skill – or lack – with Styrofoam, clay, and paint. Source: Hale, K & Briskie, JV (2007) Response of introduced European birds in New Zealand to experimental brood parasitism. Journal of Avian Biology DOI: 10.1111/j.2007.0908-8857.03734.x

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