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Emergence and longevity of seedlings beneath Guamâ€™s only known HÃ¥yun lÃ¥gu Tree Serianthes nelsonii were studied to determine the fate of every observed seedling during 2013.Â Newly emerged seedlings were marked with wire stakes every 15 days, then the stakes were collected at each seedling upon death.Â Longevity of each seedling was calculated from the marked ending and emergence dates.Â The least number of newly emerged seedlings was recorded at the end of the dry season, and the greatest number of newly emerged seedlings was recorded in the beginning of the rainy season.Â More than half of the yearâ€™s 374 seedlings died in less than 30 days.Â Seedling longevity ranged from a mean of 31 days for seedlings that emerged in May to 78 days for seedlings that emerged in June.Â Our results reveal that the baseline level of recruitment potential of the lone survivor of this species on Guam is substantial, and underscore the need for further research to determine the factors associated with the acutely limited seedling lifespan.Â
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Clark, D.A. & D.B. Clark (1984). Spacing dynamics of a tropical rain forest tree: evaluation of the Janzen-Connell model. American Naturalist 124: 769â€“788; http://dx.doi.org/10.1086/284316
Connell, J.H. (1971). On the role of natural enemies in preventing competitive exclusion in some marine animals and in rain forest trees, pp. 298â€“312. In: den Boer, P.J. & G.R. Gradwell (eds.). Dynamics of Populations. Centre for Agricultural Publishing and Documentation, Wageningen, Netherlands.
Finch-Savage, W.E. & G. Leubner-Metzger (2006). Seed dormancy and the control of germination. New Phytologist 171: 501â€“523; http://dx.doi.org/10.1111/j.1469-8137.2006.01787.x
Janzen, D.H. (1970). Herbivores and the number of tree species in tropical forests. American Naturalist 104: 501â€“529; http://dx.doi.org/10.1086/282687
Marler, T.E., A.N. Cascasan & J.H. Lawrence (2015). Threatened native trees in Guam: short-term seed storage and shade conditions influence emergence and growth of seedlings. Hort Science 50: 1049â€“1054.
Marler, T. & C. Musser (2015). Potential stressors leading to seedling mortality in the endemic HÃ¥yun lÃ¥gu tree (Serianthes nelsonii Merr.) in the island of Guam. Tropical Conservation Science 8: 738â€“744.
Merrill, E.D. (1919). Additions to the flora of Guam. Philippine Journal of Science 15: 539â€“544.
U.S. Fish and Wildlife Service (1987). Determination of endangered status for Serianthes nelsonii Merr. (Hayun lagu or Tronkon Guafi). Federal Register 52(32): 4907â€“4910.
U.S. Fish and Wildlife Service (1994). Recovery plan for Serianthes nelsonii. U.S. Fish and Wildlife Service, Portland, O Oregon. 60 pages. Available online at <http://www.fws.gov/pacificislands/recoveryplans.html>. Downloaded on 30.ix.2015.
Wiles, G. (1998). Serianthes nelsonii. The IUCN Red List of Threatened Species. Version 2015.1. . Downloaded on 30 November 2015; e.T30437A9550169; http://dx.doi.org/10.2305/IUCN.UK.1998.RLTS.T30437A9550169.en
Wiles, G.J., I.H. Schreiner, D. Nafus, L.K. Jurgensen & J.C. Manglona (1996). The status, biology, and conservation of Serianthes nelsonii (Fabaceae), an endangered Micronesian tree. Biological Conservation 76: 229â€“239; http://dx.doi.org/10.1016/0006-3207(95)00078-x