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| A Question For Dr. Sharpe Re: Banding | |
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| Tweet Topic Started: Jul 25 2006, 08:25 PM (254 Views) | |
| ostrich2 | Jul 25 2006, 08:25 PM Post #1 |
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Advanced Member
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Dr. Sharpe, One question about the banding of A49 - having followed this nest as well as the Saanich nest and a couple of others, it seems that banding is a frequently used technique (although not ubiquitous - the Saanich eaglets were not banded, as there was no real need to do so). Although there is often some discussion about the potential direct effects of the banding procedure (i.e. doing so at a safe time to avoid potential nest abandonment or adverse effect on the eaglet like premature fledging), there is some interesting information I came across concerning other effects of banding. David Hancock, who has been the main organizer of the Saanich cam, describes in one of his books some research which suggested that climbing into nests could also have an effect on nesting behaviour and productivity in following years. The Bald Eagle of Alaska, BC and Washington: Apparently, bald eagles (and maybe other birds as well) don't feel secure if their nests have been found by climber or helicopter. When they feel insecure, they more easily lose their eggs to crows or abandon their nests when disturbed. The end result was that banding nestlings and helicopter flights close to the nest reduced to half the normal number of young being raised each year - for at least 3 years after the intrusion...The deceiving observation was that during the year of the visit the production of young remained normal as the nest was not immediately abandoned. I was surprised to read that because I don't think I'd seen that aspect mentioned anywhere else. Even in the discussions about possible banding on the Saanich site I don't think anyone mentioned this. Is there any potential effect that the banding could have on K10's and K26's choice of nest site and/or possible breeding productivity next year? Given the great importance of being able to track A49 I would imagine that wouldn't change the decision to do so in this case. But I'm curious as to whether that's considered in making decisions on whether to band? |
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| Eagle Guy | Jul 26 2006, 08:25 AM Post #2 |
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Advanced Member
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We have seen no obvious signs of nest abandonment related to our visits to the nest (3 times per year on Catalina). We have pairs that have been using the same nest for up to 15 years. I don't think our trip to band #49 will have any effect on the adults' choice of nest next year because they were not around at the time and never even knew we were there. It is a lot more work to create a new nest from scratch versus repair an existing nest, so the likelihood is that they will use this same nest again. If not, we'll move our camera to watch the new nest. |
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6:29 AM Jul 11