[Tweeters] iPods- more studies/ papers

Eric Cannizzaro oporornis.p at gmail.com
Sun Nov 28 11:12:41 PST 2010

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


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 (Götmark 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


>> _______________________________________________

>> Tweeters mailing list

>> Tweeters at u.washington.edu

>> http://mailman2.u.washington.edu/mailman/listinfo/tweeters




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