Sugiyama, A., Comita, L. S., Masaki, T., Condit, R. & Hubbell, S. P. (2018) Resolving the paradox of clumped seed dispersal: positive density and distance dependence in a bat-dispersed species. Ecology 99: 2583-2591 Available here and here.
Sugiyama, A., Shichi, K., Masaki, T. & Hubbell, S. P. (2017) The use of soil pollen to determine the sex of overhead individuals of a temperate dioecious shrub. American Journal of Botany 104: 632-638. Available here.
Sugiyama, A., Masumori, M. & Tange, T. (2016) Evaluation of bioactivity in embryonic axes by vital staining after exposure to liquid nitrogen on temperate recalcitrant seed species, Quercus myrsinaefolia and Q. glauca. Bulletin of the University of Tokyo Forests 135: 1-14. Available here.
Sugiyama, A. & Peterson, C. J. (2015) Transplant experiments reveal edge effects and inconsistent maternal effects on seedling performance in the pioneer tree Ficus tonduzii (Moraceae). TROPICS 24: 91-99. Available here.
Sugiyama, A. (2015) Recruitment distance from the nearest reproductive conspecific increases with tree size in tropical premontane wet forests. Biotropica 47: 526-535. Available here.
Sugiyama, A. & Peterson, C. J. (2013) Higher seed germination from smaller than medium-sized premontane forest fragments for three animal-dispersed tree species in Costa Rica. Plant Ecology 214: 115-125. Available here.
Sugiyama, A. & Peterson, C. J. (2013) Edge effects act differentially on multiple early regeneration stages of a shade-tolerant tree Tapirira mexicana. Biotropica 45: 37-44. Available here.
Ogden, A. B., Kim, J., Radcliffe, C. A., van Iersel, M. W., Donovan, L. A. & Sugiyama, A. (2011) Leaf and bud temperatures of southern highbush blueberries (Vaccinium corymbosum) inside high tunnels. Acta Horticulturae 893: 1319-1325. Available here.
If you do not have free access to these papers, please feel free to send me a request.