Sampling Forest Canopy Arthropods Available to Birds as Prey
A method of sampling canopy arthropods using direct observation is presented whereby the abundance of different types of arthropods (flying, foliage dwelling, etc.) can be directly compared because the same sampling unit (numbers/leaf area) is used. Total leaf surface area in patches of directly observable foliage was determined by using leaf length/surface area equations. Estimates of relative abundance of different arthropod taxa were used to compare with percent composition of those taxa in diets of canopy foraging bird species. A total of 6,802 arthropods was identified in 1404 samples containing 197,964 leaves. Examples of arthropod abundance estimation and assessment of use versus availability of arthropod prey are provided from one month (May, 1986) of the study.
KeywordsObservable Foliage Prey Category Yellow Warbler Arthropod Taxon Eastern Deciduous Forest
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