Abstract
A significant decrease in mean egg-shell thickness since 1945 was found in two of the six Australian Falco: Peregrine (F. peregrines) (10%) and Hobby (F. longipennis) (2%). The eggs of the other three species, in certain localised areas only, showed significant thinning. The six Australian Falco conform to the general 'rules' influencing the degree of egg-shell thinning; that is, those pertaining to diet and distribution. At least one species, the Peregrine, could be expected to be suffering localised decreases in productivity due to breakage of thin-shelled eggs.
| Original language | English |
|---|---|
| Pages (from-to) | 389-392 |
| Number of pages | 4 |
| Journal | International Council for Bird Preservation |
| Volume | 5 |
| Publication status | Published - 1985 |
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