Abstract
Foliage-inhabiting mites and associated insects were observed over a 3-year period on abandoned apple trees at two sites in southern Ontario. This study included species diversity and seasonal dynamics as well as the total habitat size and its seasonal fluctuations. Due to heavy feeding on the leaves in the early season by the fall cankerworm, at one observation site, the habitat available for foliage-inhabiting mites was regulated so that both the total number and the area of leaves on the tree did not increase significantly until early July. However, the influence of this on the population of the dominant mite species was minimal. The mite community was relatively stable over time. Four phytophagous species, representing a basic trophic level, were fed upon by a group of predacious mites. The phytophagous mites consisted of two rust-mite species (Diptacus gigantorhynchus sp. complex andEriophyes pyri sp. complex) and two tetranychid species (Bryobia rubrioculus andEotetranychus uncatus). On the basis of consistency in seasonal abundance,D. gigantorhynchus was the only prey species which could support the early-season population increase of the predacious mites. Ten species of predacious mites were recorded on the apple trees, nine phytoseiids and one stigmaeid; two separate species of these were common at each of two observation sites:Typhlodromus pomi and the stigmaeidZetzellia mali at one site; and two phytoseiid species,Phytoseius macropilis andAmblyseius finlandicus, at the other. There seemed to be a rather simple and stable prey/predator system at each site throughout the three seasons. Species dominance on these apple trees was investigated for the phytoseiids, especially from the perspective of the issue of ‘one-species dominance’.
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Amano, H., Chant, D.A. Species diversity and seasonal dynamics of Acari on abandoned apple trees in southern Ontario, Canada. Exp Appl Acarol 8, 71–96 (1990). https://doi.org/10.1007/BF01193383
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DOI: https://doi.org/10.1007/BF01193383