| Abstract: | Eggs or empty shells of the American woodcockwere collected from 10 states in 1971and shell thickness (mean of clutch means) was compared with that of eggs collected from 16 states during the years 1859-1939. The 1971 shells (n = 91) from hatched eggs or those containing fully developed embryos were about i0 percent thinner (P<0.001) than both unembryonated shells (n = 26) from the same year and the 1859-1939 shells (n = 169) from essentially unembryonated eggs. The difference is attributed to the transfer of calcium from the shells to the embryos and not to environmental pollutants. |
| Genre: | Article |
| ProdID: | 1008175 |
| Citation Author: | Laakkonen, J.; Fisher, R. N.; Case, T. J. |
| Citation Contributing Office: | Western Ecological Research Center |
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| Citation End Page: | 788 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Animal Ecology |
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| Citation Number Of Pages: | 13 |
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| Citation Phsyical Description: | p. 776-788 |
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| Citation Search Results Text: | Effects of different land cover, habitat fragmentation, and ant colonies on the distribution and abundance of shrews in southern California; 2001; Article; Journal; Journal of Animal Ecology; Laakkonen, J.; Fisher, R. N.; Case, T. J. |
| Citation Start Page: | 776 |
| Citation Volume: | 70 |
| Citation Year: | 2001 |
| Type: | citation/reference |
| Text: | Effects of different land cover, habitat fragmentation, and ant colonies on the distribution and abundance of shrews in southern California; 2001; Article; Journal; Journal of Animal Ecology; Laakkonen, J.; Fisher, R. N.; Case, T. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 2001 00:00 -0600 |
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