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Abstract. The North Slope Eider Survey has been conducted for 9 consecutive years, 1992 to 2000. Survey techniques have remained constant, except that since1997 observations have been dictated directly into computers that were connected to an onboard GPS, giving precise coordinates for all observati...
| Main Authors: | , , , , , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.383.4826 http://www.arlis.org/docs/vol1/A/213375107/609897140-1999.pdf |
| Summary: | Abstract. The North Slope Eider Survey has been conducted for 9 consecutive years, 1992 to 2000. Survey techniques have remained constant, except that since1997 observations have been dictated directly into computers that were connected to an onboard GPS, giving precise coordinates for all observations. The survey pilot was the same person for all years, while the copilot/observer changed in 1997 and again in 2000. In 1998 the survey area was split into 11 geographical strata based on habitat features and the boundaries of the National Petroleum Reserve of Alaska, northeast planning area. Data were re-analyzed for all years using the new stratification, which slightly improved precision of the estimates and facilitated area-wise comparisons. Snow accumulations were heavy in 1999, and even heavier in 2000, delaying waterfowl breeding activity a few days, though warm June temperatures hastened availability of nesting habitat. The 1999 and 2000 breeding indices for spectacled eider were 6440 and 5900, respectively, continuing a non-significant |
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