Abstract
The vegetative and reproductive phenology of the subtropical mangrove species Rhizophora stylosa was investigated at Manko Wetland, Okinawa Island, Japan. We assessed phenology using litterfall data over four years. Leaf and stipule litterfall occurred throughout the year, with distinct seasonal patterns. Kendall’s coefficient of concordance, W, revealed that the monthly changes in leaf and stipule litterfall were strongly and significantly concordant among years. Leaf litterfall was significantly correlated with monthly maximum wind speed and monthly day length, and stipule litterfall was significantly correlated with monthly mean air temperature and relative humidity. Branch litterfall showed no clear monthly pattern and correlated well with monthly maximum wind speed. Mean total litterfall was 11.2 Mg ha−1 year−1, with the largest component being vegetative organs (78.7 %). Flower, fruit, and propagule litterfall were all highest in summer and lowest in winter. The W values revealed that most reproductive organs in litterfall had significant monthly trends. Flower and fruit litterfall were significantly correlated with monthly day length and monthly mean air temperature, respectively. The average development periods from flower buds to flowers, fruits, and mature propagules were approximately 2–3 months, 4–5 months, and 11–12 months, respectively. Except for branches, all vegetative and reproductive components of litterfall had approximately one year cycles.
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Acknowledgments
This study was partially supported by a Grant-in-Aid for Scientific Research (No. 23380094) from the Ministry of Education, Culture, Sport, Science and Technology, Japan.
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Kamruzzaman, M., Sharma, S., Kamara, M. et al. Phenological traits of the mangrove Rhizophora stylosa Griff. at the northern limit of its biogeographical distribution. Wetlands Ecol Manage 21, 277–288 (2013). https://doi.org/10.1007/s11273-013-9299-1
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DOI: https://doi.org/10.1007/s11273-013-9299-1