The book Special Scientific Report--Wildlife 216 was written by author U.S. Fish And Wildlife Service Here you can read free online of Special Scientific Report--Wildlife 216 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Special Scientific Report--Wildlife 216 a good or bad book?
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We tested eggshell thickness means for sites as grouped in Appendix V within each period, using 2- way ANOVA procedures. Significant site differences (P < 0.05) in both periods were detected for anhinga, great blue heron, great egret, snowy egret, Louisiana heron, black-crowned night heron, least bittern, and glossy ibis. However, interactions were significant only for the anhinga, great blue heron, and black- crowned night heron, species in which differences were detected over time. Site differences were not detected in the green heron, little blue heron, white ibis, or roseate spoonbill. Thus, the "site effect" is consistent over time for all species except the three in which a "time effect" occurred. Presumably, this time effect on eggshell thickness is related to the introduction of 19 DDT to the environment and its occurrence at ele- vated levels in eggs of these species at certain sites.
For a few species in which sample sizes were suffi- cient, we also tested for differences in shell thickness relative to other factors.
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