35. Brown, Jr. R. M., 1971. Studies of Hawaiian fresh-water and soil algae. I. the atmospheric dispersal of algae and fern spores across the island of Oahu, Hawaii. Contributions in Phycology. Sept. 1971, 175-188.

35. Summary

The distribution of air-borne algae and fern spores over the island of Oahu, Hawaii, was studied by the detection of viable impactions on the surface of selected agarized growth media. During the summers of 1964 and 1965, twelve different sampling runs were made along a transect from Honolulu to Kailua Beach. Air passing over the windward side of Oahu at Kailua Beach is devoid of algae. Two fallout peaks of air-borne algae occur, one on the windward and the other on the leeward side of the island. It was suggested that these peaks represent cumulative build-up of soil-borne algae and that the leeward peak consists of windward-dispersed algae in addition to the leeward build-up. Generic diversity coincided with quantitative distribution over the transect route. Some genera were found in all sampling stations while others were restricted to either the leeward, windward, or mid regions of Oahu. The principal distribution of fern spores was limited to the windward side of Oahu, and this was thought to be due to the larger size of the fern spore and to the specific dispersal mechanism directly associated with the limited distribution of fern sporophytes. The distribution pattern of algae and fern spores was discussed in relation to such physical factors as mountain barriers and various meteorological parameters. It was suggested that Hawaii provides a model system for future study of air-borne microbes, especially in relation to soil microbes and their evolutionary history in these geologically young land masses.

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