نتایج جستجو برای: corvidae

تعداد نتایج: 101  

2002
Walter D. Koenig Johannes M. H. Knops William J. Carmen

We investigated arboreal removal and insect damage to acorns in an undisturbed oak woodland in central coastal California. Arboreal seed removal was determined for four to eight individual Quercus lobata trees over a period of 14 years by comparing visual estimates of the acorn crop with the number of acorns caught in seed traps. Insect damage was assessed by sampling acorns from trees of all t...

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