This is an interesting website with much more information on tapes, and goes
though a few studies. http://www.kolkatabirds.com/callplayback.htm

Eric



On Sun, Nov 28, 2010 at 11:05 AM, Eric Cannizzaro <oporornis.p at gmail.com>wrote:

> Hey people,
>
> With all this talk about not knowing how harmful stressing a bird can be I
> thought I should show some of the articles/ studies that address this. As of
> 2001 no studies have been done on tapes and stressing birds but stressing a
> bird does have measurable negative effects. Small birds are eating
> constantly because of high energy needs, preoccupying them with calls etc.
> takes away foraging time, (not to mention incubation and establishing
> /protecting territory) and causes stress. Stress alone can kill a bird, as
> banders know.
>
> "A review of 27 studies on the effects of wildlife observation and
> photography on birds reported negative effects on birds in 19 of the studies
> (Boyle & Samson 1985), even though most of these may be due to photography
> rather than birdwatching (Klein 1993; Tershy et al. 1997)."
>
>
> "The majority of the birds studied were most sensitive to disturbance
> during the breeding period (G?tmark 1992; Knight & Cole 1995). Human
> presence around bird nests increased nest abandonment and egg loss due to
> nest preda- tors (HaySmith & Hunt 1995; Hanson 2000), so birdwatching
> activity should be minimized around nests and young, especially around
> nesting colonies, which can be deserted as the consequence of the
> disturbance induced by just one person (Larson 1995)."
>
>
> "Even outside the breeding period, birdwatchers should minimize flushing
> of birds, since this has high physiological costs for many species
> (Gabrielsen & Smith 1995) and can be fatal to birds during times of food
> shortage (Knight & Cole 1995)."
>
>
> "Many birdwatchers play calls of secretive species to lure them out of
> their hiding places and, during the breeding period, this may stress birds,
> as well as leave nests exposed to predators. There have been no studies on
> the effects of tapes on birds and this should be a research priority of bird
> disturbance researchers."
>
>
> http://www.stanford.edu/~cagan/SekerciogluOrniTourismEnvCons2002.pdf
>
>
> Eric Cannizzaro
>
> Evergreen State College
>
>
>
>
> On Sun, Nov 28, 2010 at 10:28 AM, Rob Sandelin <nwnature1 at gmail.com>wrote:
>
>> If I use an artificial call to lure a bird out so I can see it or
>> photograph it, what harm does it do the bird? This is an unanwerable
>> question. The assumption is: If only I do this a little its not a problem.
>> And maybe if only one person every day, just did this once, maybe the impact
>> is minimal. But what if you are not the only person that day? In heavy
>> travelled areas there can be hundreds of birders in a day. Is it the 4th
>> time, the 9th time, the 27th time the bird has been called out? You can't
>> know that. And if you have the right to do this, so does the next person.
>> Maybe your ethics are such you only play the song a couple times then stop.
>> But the next person plays it constantly. I would be surprised if there is
>> any substantial data on the affect of bird luring. So, like many
>> activities, we just don't know the impact of this on the birds and probably
>> never will. We know for sure that NOT luring birds out with artificial
>> calls does not hurt them. Given how much of the natural world humankind is
>> destroying, seems a no brainer to me to leave the birding to chance. If you
>> see it, you see it, and if the bird does not reveal itself to you on that
>> trip, let it live its life undisturbed.
>>
>> Rob Sandelin
>> Naturalist, Writer, Teacher
>> Snohomish
>>
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>>
>>
>
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