Dispersal potential and early growth in 14 tropical mangroves: do early life history traits correlate with patterns of adult distribution?

Citation
Pj. Clarke et al., Dispersal potential and early growth in 14 tropical mangroves: do early life history traits correlate with patterns of adult distribution?, J ECOLOGY, 89(4), 2001, pp. 648-659
Citations number
38
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF ECOLOGY
ISSN journal
0022-0477 → ACNP
Volume
89
Issue
4
Year of publication
2001
Pages
648 - 659
Database
ISI
SICI code
0022-0477(200108)89:4<648:DPAEGI>2.0.ZU;2-J
Abstract
1 We characterized the dispersal potential and early growth traits of 14 tr opical mangrove species in experiments where diaspores were immersed in var ious solutions of seawater and subsequently stranded onto surfaces with the same salinity. 2 Viviparous and non-viviparous species had similar buoyancy, seed weight a nd rates of root and shoot initiation, as well as early growth and salinity tolerance. This trait convergence may be related to selection against smal l, dormant diaspores in the unstable regeneration niche. 3 Differences in dispersal potential and early growth of 12 species were co mpared with known patterns of distribution (across the shore, along estuari es, regional occurrence and continental range size) to test if tidal sortin g of diaspores could account for adult spatial patterns. 4 Diaspore buoyancy, orientation, lateral root initiation, shoot initiation and early shoot extension differed among species but none correlated with adult zonation across the shore or along estuaries. However, some back-shor e species had diaspores that were buoyant and were slow to initiate lateral roots and shoots. Patterns of early growth were partially related to the d istribution along estuaries but salinity responses contributed to this zona tion in only three species. 5 Regional distributions were unrelated to dispersal potential. However, th e tendency of infrequent species to show slow growth in full seawater may a ccount for the under-saturation of species in estuaries with appropriate ha bitats. The range size of the tropical mangroves appears unrelated to their dispersal potential and early growth traits. 6 Early life history traits of 12 mangroves showed poor correlation with pa tterns of adult distribution across all spatial scales. Traits related to e stablishment were., however, stronger predictors of distribution than those associated with dispersal.