Abstract
Two years of aerial pollen trapping at two lakes surrounded by coniferous forest are summarized. Most of the annual pollen and spore deposition occurs between February and May (86%), followed by 10% during the summer, and 4% during the fall – winter nonflowering period. Annual aerial influx is very similar at both Marion and Surprise lakes, ca. 5000 grains∙cm−2∙year−1. The annual frequency spectra are also equivalent, with a predominance of Cupressaceae (32%) and Alnus (35%), followed by Tsuga heterophylla (8 – 11%), grasses (8 – 10%), and pine (2 – 3%). Regional, rather than local or extralocal pollen, is estimated to account for about 90% of the annual aerial deposition at both lakes. The data also suggest that pollen transport is predominantly upslope in this mountainous area.
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