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This study surveyed isoprene emission from 42 indigenous and exotic tropical trees in subtropic Okinawa, Japan. Of the 42 trees studied, 4 emitted isoprene at a rate in excess of 20μgg −1 h −1 , and 28 showed the rates of 1–10μgg −1 h −1 . The remainder emitted less than 1μgg −1 h −1 . The majority of trees in this study may therefore fall within the...