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Documents disponibles écrits par cet auteur (4)
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Article
I provide a detailed description of an arthropod sampling technique, "branch clipping," and evaluate its efficacy in measuring food availability for three foliage-gleaning migratory warbler species wintering in Jamaica. I incorporated foraging o[...]
Article
M. D. Johnson, Auteur ; A. M. Strong, Auteur ; T. W. Sherry, AuteurExplanations for the ecological integration of migratory and non-migratory (resident) insectivorous birds in the tropics have been complicated by the paradox that arthropod abundances are low when bird abundances reach their annual peak. The bre[...]
Article
M. D. Johnson, Auteur ; J. L. Kellermann, Auteur ; A. M. Stercho, AuteurThe reduction of insect pests by birds in agriculture may provide an incentive for farming practices that enhance the conservation value of farms for birds and other wildlife. We investigated pest reduction services by insectivorous birds on a c[...]
Article
M. D. Johnson, Auteur ; D. R. Ruthrauff, Auteur ; J. G. Jones, Auteur ; J. R. Tietz, Auteur ; J. K. Robinson, AuteurForced regurgitation by oral administration of tartar emetic has been used frequently to examine avian diets because it does not require killing birds directly, but indirect (delayed) mortality by this technique is not well studied. We examined [...]
