Abstract
Context
Fragmentation is a common and increasingly serious problem in tropical rainforests through the world, resulting in changes in species composition and subsequent species extinctions.
Aim
The aim of this study was to test the hypothesis that changes in species composition can originate from the different selection pressures on pioneer and climax seeds as the habitat changes.
Methods
Baccaurea ramiflora seeds were placed on the ground in six quadrats in five different habitats in the field, while graded temperature and relative humidity treatments in the laboratory were used to mimic the changed microclimate in rainforest fragments. Changes in seed moisture and viability were monitored.
Results
B. ramiflora seeds are recalcitrant and highly sensitive to both high temperatures and dehydration, with a reduced lifespan when temperature increased or relative humidity decreased, and viability is lost when dehydrated to 0.198 g/g or warmed to ≥ 35 °C. Germination was delayed in non-rainforest conditions compared with the rainforest understory, and only one-third of the seeds assigned to an open site germinated and emerged.
Conclusion
The results support our hypothesis that recalcitrant-seeded species have a high dependence on intact rainforests, and that fragmentation and disturbance will reduce their germination and establishment while favoring orthodox-seeded pioneers.
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References
Bruna EM (1999) Seed germination in rainforest fragments. Nature 402:139
Cao M, Zou XM, Warren M, Zhu H (2006) Tropical forests of Xishuangbanna, China. Biotropica 38:306–309
Cao M, Zhu H, Wang H, Lan GY, Hu YH, Zhou SS, Deng XB, Cui JY (2008) Xishuangbanna tropical seasonal rainforest dynamics plot: tree distribution maps, diameter tables and species documentation. Yunnan Science and Technology Press, Kunming
Chen H, Cao M, Baskin JM, Baskin CC (2013) Temperature regulates posivively photoblastic seed germination in four Ficus (Moraceae) tree species from contrasting habitats in a seasonal tropical rainforest. Am J Bot 100:1683–1687
Daws MI, Burslem DFRP, Crabtree LM, Kirkman P, Mullins CE, Dalling JW (2002) Differences in seed germination responses may promote coexistence of four sympatric piper species. Funct Ecol 16:258–267
Dickie JB, Pritchard HW (2002) Systematic and evolutionary aspects of desiccation tolerance in seeds. In: Black M, Pritchard HW (eds) Desiccation and survival in plants: drying without dying. CAB International, Wallingford, pp 239–259
Farnsworth E (2000) The ecology and physiology of viviparous and recalcitrant seeds. Annu Rev Ecol Evol Syst 31:107–138
Gascon C, Williamson GB, da Fonseca GAB (2000) Receding forest edges and vanishing reserves. Science 288:1356–1358
Kyereh B, Swaine MD, Thompson J (1999) Effect of light on the germination of forest trees in Ghana. J Ecol 87:772–783
Laurance WF, Ferreira LV, Merona JMR, Laurance SG (1998a) Rain forest fragmentation and the dynamics of Amazonian tree communities. Ecology 79:2032–2040
Laurance WF, Ferreira LV, Merona JMR, Laurance SG, Hutchings RW, Lovejoy TE (1998b) Effects of forest fragmentation on recruitment pattern in Amazonian tree communities. Conserv Biol 12:460–465
Laurance WF, Nascimento HEM, Laurance SG, Andrade A, Ribeiro JLS, Giraldo JP, Lovejoy TE, Condit RC, Chave J, Harms KE, D’Angelo S (2006) Rapid decay of tree-community composition in Amazonian forest fragments. Proc Natl Acad Sci USA 103:19010–19014
Li HM, Ma YX, Liu WJ, Liu WJ (2009) Clearance and fragmentation of tropical rain forest In Xishuangbanna, Sw, China. Biodivers Conserv 18:3421–3440
Liu WJ, Li QJ, Zhang GM, Shi JP, Bai KJ (2000) Microclimatic characteristics of canopy gaps in Shorea chinensis forest in Xishuangbanna (in Chinese with English abstract). Acta Phytoecologica Sinica 24:356–361
Ma YX, Liu YH, Zhang KY (1998) On microclimate edge effects of tropical rainforest fragments in Xishuangbanna (in Chinese with English abstract). Acta Phytoecologica Sinica 22:250–255
Metcalfe DJ (2001) Germination of small-seeded tropical rain forest plants exposed to different spectral compositions. Can J Bot 74:516–520
Myers N (1998) Threatened biotas: “hotspot” in tropical forests. Environmentalist 8:1–20
Raich JW, Khoon GW (1990) Effect of canopy openings on tree seed germination in a Malaysian dipterocarp forest. J Trop Ecol 6:203–217
Roberts EH, King MW (1980) The characteristics of recalcitrant seeds. In: Chin HF, Roberts EH (eds) Recalcitrant crop seeds. Tropical, Kuala Lumpur, pp 1–5
Samarah NH, Mullen RE, Alqudah AM (2009) An index to quanitify seed moisture loss rate in relationship with seed desiccation tolerance in common vetch. Seed Sci Technol 37:413–422
Souza RP, Válio IFM (2001) Seed size, seed germination, and seedling survival of Brazilian tropical tree species differing in successional status. Biotropica 33:447–457
Swaine MD, Whitmore TC (1988) On the definition of ecological species groups in tropical rain forests. Vegetatio 75:81–86
Thompson K (2000) The functional ecology of soil seed banks. In: Fenner M (ed) Seeds: the ecology of regeneration in plant communities, 2nd edn. CAB International, Oxford, pp 215–235
Turner IM (1996) Species loss in fragments of tropical rain forest: a review of the evidence. J Appl Ecol 33:200–209
Tweddle JC, Dickie JB, Baskin CC, Baskin JM (2003) Ecological aspects of seed desiccation sensitivity. J Ecol 91:294–304
Vásquez-Yanes C, Orozco-Segovia A (1990) Ecological significance of light-controlled seed germination in two contrasting tropical habitats. Oecologia 83:171–175
Vázquez-Yanes C, Orozco-Segovia A, Sánchez-Coronado ME, Rojas-Aréchiga M, Batis AI (2000) Seed ecology at the northern limit of the tropical rain forest in America. In: Black M, Bradford KJ, Vazquez-Ramos J (eds) Seed biology: advances and applications. CAB International, Wallingford, UK, pp 375–388
Wen B (2011) Changes in the moisture and germination of recalcitrant Hopea mollissima seeds (Dipterocarpaceae) in different desiccation regimes. Seed Sci Technol 39:214–218
Yu Y, Baskin JM, Baskin CC, Tang Y, Cao M (2008) Ecology of seed germination of eight non-pioneer tree species from a tropical seasonal rain forest in Southwest China. Plant Ecol 197:1–16
Zhu H (1997) Ecological and biogeographical studies on the tropical rain rorest of South Yunnan, Sw China with a special reference to its relation with rain forests of tropical Asia. J Biogeogr 24:647–662
Zhu H (2004) A tropical seasonal rain forest at its altitudinal and latitudinal limits in Southern Yunnan, Sw China. Gardens’ Bulletin (Singapore) 56:55–72
Zhu H, Xu ZF, Wang H, Li BG (2004) Tropical rain forest fragmentation and its ecological and species diversity changes in Southern Yunnan. Biodivers Conserv 13:1355–1372
Zhu H, Wang H, Zhou SS (2010) Species diversity, floristic composition and physiognomy changes in a rainforest remnant in Southern Yunnan, China after 48 years. J Trop For Sci 22:49–66
Acknowledgment
We are grateful to Prof. Richard Corlett in our botanical garden for providing linguistic help. Thanks are given to the National Natural Science Foundation of China (31170626) for providing financial support for this research.
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Handling Editor: Erwin Dreyer
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The contribution of individual authors: Bin Wen designed the experiment, wrote the manuscript and supervised the work. Yifan Cai ran the experiment and analyzed the data.
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Wen, B., Cai, Y. Seed viability as a function of moisture and temperature in the recalcitrant rainforest species Baccaurea ramiflora (Euphorbiaceae). Annals of Forest Science 71, 853–861 (2014). https://doi.org/10.1007/s13595-014-0388-y
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DOI: https://doi.org/10.1007/s13595-014-0388-y