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| | IFWIS - Double-crested Comorant |
 | | Egg: Habitat deterioration and pesticides are other causes of population declines *09,10,11,20,21*. |
 | | Limiting factors: Eggshell thinning due to exposure to DDE, DDT, and PCB's; predation of eggs and young by crows, ravens, and gulls; human disturbances that cause abandonment of eggs or young; natural deterioration or human destruction of habitat; and temporary food shortages all mentioned as possible limiting factors *09,11,20,21,28,29,30,31*. |
 | | Verbeek (1982) reports that crows were responsible for the destruction of 22% of cormorant eggs (first clutch) in B.C. human disturbance often mentioned *08,11,21,24,30,32*. |
| www.inhs.uiuc.edu /chf/pub/ifwis/birds/double-crested-comorant.html (1532 words) |
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