Fruiting phenology affected by seed preference and fluctuation of seed predator activity in a Tropical Peat Swamp Forest
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- POESIE Erna S
- Graduate School of Agriculture, Ehime University
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- HAMAMOTO Kyoko
- Graduate School of Agriculture, Ehime University
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- MOMOSE Kuniyasu
- Graduate School of Agriculture, Ehime University
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- SHIMAMURA Tetsuya
- Graduate School of Agriculture, Ehime University
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- PAGE Susan E
- Department of Geography, University of Leicester
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- NINOMIYA Ikuo
- Graduate School of Agriculture, Ehime University
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- LIMIN Suwido H
- Graduate School of Agriculture, Ehime University
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The hypothesis that the fruiting phenology of a plant community is affected by both fluctuating predation pressure and the seed preference of predators (risk of predation) was tested in a tropical peat swamp forest in Central Kalimantan, Indonesia. We conducted: (i) a seed removal experiment using model seeds (i.e. jackfruit seeds which are low in secondary compounds and attractive to seed predators) that investigated fluctuations in predators’ activity and (ii) a seed removal experiment using 17 natural species to clarify seed preferences of seed predators; we also monitored the fruiting phenology of the 17 study species. The removal rate of model seeds decreased during high water table, whilst it increased during low water table, indicating that flooding restricted the feeding activity of terrestrial small mammals which are the dominant seed predators in peat swamp forest. Differences in fruiting time between species with higher removal rates (preferred) and lower removal rates (less preferred) were observed. Species with high removal rates showed peaks of fruiting during flood periods and the reproductive pattern of this group was negatively regressed to the removal rate of model seeds and positively regressed to water level. The implication of this result is that these tree species produce seeds and deposit them on the ground whilst seed predators are disturbed by flooding, thus they avoid seed deposition when predators’ activity is high. Seed production amongst species with low removal rates was variable indicating that these tree species are likely more adapted to other factors that affect survival of seeds and/or seedling (i.e. regeneration niche) than predation. We were able to demonstrate another relationship between fruiting phenology and seed predation that differs from that of mast fruiting. The fact that species with preferred seeds produce their fruits when predator activity is restricted might have developed under the conditions of poor nutrient availability and frequent flooding that are characteristic of the peat swamp forest ecosystem.
収録刊行物
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- Tropics
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Tropics 20 (1), 11-24, 2011
日本熱帯生態学会
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詳細情報 詳細情報について
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- CRID
- 1390001204422199808
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- NII論文ID
- 130004843759
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- NII書誌ID
- AN10528811
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- ISSN
- 18825729
- 0917415X
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- NDL書誌ID
- 023599249
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
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