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| Which Eggs Are Allowed To Hatch | |
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| Tweet Topic Started: Jul 30 2006, 07:59 PM (283 Views) | |
| Eagle Guy | Jul 30 2006, 07:59 PM Post #1 |
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Advanced Member
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I've cross-posted an answer to the question "Why was A-49's egg chosen as the one that would be left in the nest, instead of removed and artificially incubated." The Santa Cruz bald eagle restoration project is a five-year experimental reintroduction project, initiated in 2002, to see if the eagles do any better on the northern Channel Islands as compared to those on Catalina Island. Therefore, all the eggs are going to be left in the nests for the next couple of years to see how many hatch/fail. If the same problem of eggshell thinning occurs, then a decision will have to be made by the powers-that-be on whether to manipulate the nests as has been done on Catalina since 1989. However, everything looks good right now with the hatching of chicks from the only two nests we know about on the northern Channel Islands. We placed the video camera on the nest shortly after we located it so that we could document the success/failure. The camera was initially much further from the nest and it was very difficult to discern what was happening (before the on-line system was set up). I then moved the camera closer to the nest and placed it in a tree. That worked better, until it started getting windy and the camera tree swayed back and forth, giving only glimpses of the nest and making people sea sick (at least it made me sea sick). I then found a good spot on the ground, set up a tripod and placed the camera there. That has been the camera view you have been enjoying for the past couple of months. |
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| ostrich2 | Jul 30 2006, 08:32 PM Post #2 |
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Advanced Member
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According to the information on the website, K10 was documented on Santa Cruz as of Aug 2003, and K26 was first seen on Santa Cruz in Feb 2005. If there were still sufficient levels of contaminants such as DDT to potentially cause problems for egg hatching, how long would it take for their effects to become apparent? In other words, would we expected to have seen such effects with K10 or K26 already based on the amount of time they have spent in the area, or could such problems still arise in the future with further exposure? |
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| Eagle Guy | Jul 31 2006, 07:02 PM Post #3 |
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Advanced Member
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It could take a few years for contaminant levels to become high enough in an eagle to cause problems, which is why we will be monitoring the nests for the next couple of years. K-26 has only been on the islands for a little over a year, otherwise she was traveling around the mainland where the food supply should have been relatively clean. |
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6:29 AM Jul 11