DOI: 10.1016/j.foreco.2014.11.005
Scopus记录号: 2-s2.0-84949119933
论文题名: Tree size and fecundity influence ballistic seed dispersal of two dominant mast-fruiting species in a tropical rain forest
作者: Norghauer J.M. ; Newbery D.M.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 338 起始页码: 100
结束页码: 113
语种: 英语
英文关键词: Inverse modelling of dispersal
; Leguminosae-Fabaceae trees
; Masting phenology
; Reproductive traits and allometry
; Seedling recruitment
; Size at maturity
Scopus关键词: Ballistics
; Biology
; Codes (symbols)
; Rain
; Tropics
; Fabaceae
; Inverse modelling
; Masting phenology
; Reproductive traits
; Seedling recruitment
; Size at maturity
; Forestry
; dicotyledon
; fecundity
; forest canopy
; forest dynamics
; life history trait
; mortality
; rainforest
; seed dispersal
; seed production
; spatiotemporal analysis
; tropical forest
; Forests
; Maturity
; Seedlings
; Trees
; Cameroon
; Korup National Park
; South West Region
; Caesalpinioideae
; Fabaceae
; Microberlinia bisulcata
; Tetraberlinia bifoliolata
英文摘要: Seed production, seed dispersal, and seedling recruitment are integral to forest dynamics, especially in masting species. Often these are studied separately, yet scarcely ever for species with ballistic dispersal even though this mode of dispersal is common in legume trees of tropical African rain forests. Here, we studied two dominant main-canopy tree species, Microberlinia bisulcata and Tetraberlinia bifoliolata (Caesalpinioideae), in 25. ha of primary rain forest at Korup, Cameroon, during two successive masting events (2007/2010). In the vicinity of c. 100 and 130 trees of each species, 476/580 traps caught dispersed seeds and beneath their crowns c. 57,000 pod valves per species were inspected to estimate tree-level fecundity. Seed production of trees increased non-linearly and asymptotically with increasing stem diameters. It was unequal within the two species' populations, and differed strongly between years to foster both spatial and temporal patchiness in seed rain. The M. bisulcata trees could begin seeding at 42-44. cm diameter: at a much larger size than could T. bifoliolata (25 cm). Nevertheless, per capita life-time reproductive capacity was c. five times greater in M. bisulcata than T. bifoliolata owing to former's larger adult stature, lower mortality rate (despite a shorter life-time) and smaller seed mass.The two species displayed strong differences in their dispersal capabilities. Inverse modelling (IM) revealed that dispersal of M. bisulcata was best described by a lognormal kernel. Most seeds landed at 10-15. m from stems, with 1% of them going beyond 80 m (<100 m). The direct estimates of fecundity significantly improved the models fitted. The lognormal also described well the seedling recruitment distribution of this species in 121 ground plots. By contrast, the lower intensity of masting and more limited dispersal of the heavier-seeded T. bifoliolata prevented reliable IM. For this species, seed density as function of distance to traps suggested a maximum dispersal distance of 40-50 m, and a correspondingly more aggregated seedling recruitment pattern ensued than for M. bisulcata.From this integrated field study, we conclude that the reproductive traits of M. bisulcata give it a considerable advantage over T. bifoliolata by better dispersing more seeds per capita to reach more suitable establishment sites, and combined with other key traits they explain its local dominance in the forest. Understanding the linkages between size at onset of maturity, individual fecundity, and dispersal capability can better inform the life-history strategies, and hence management, of co-occurring tree species in tropical forests. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65588
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Institute of Plant Sciences, University of Bern, 21 Altenbergrain, Bern, Switzerland
Recommended Citation:
Norghauer J.M.,Newbery D.M.. Tree size and fecundity influence ballistic seed dispersal of two dominant mast-fruiting species in a tropical rain forest[J]. Forest Ecology and Management,2015-01-01,338