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Meadow fragmentation and reproductive output of the SE Asian seagrass Enhalus acoroides

AuthorsVermaat, Jan E.; Rollon, Rene N.; Lacap, Cristina Day A.; Billot, Claire; Alberto, Filipe; Nacorda, Hildie M. E.; Wiegman, Frank; Terrados, Jorge CSIC ORCID CVN
KeywordsPollen dispersal
Hydrochorous pollination efficiency
Landscape heterogeneity
Nonlinear thresholds
Tropical seagrass meadows
Issue Date29-Sep-2004
Royal Netherlands Institute for Sea Research
CitationJournal of Sea Research 52(4): 321-328 (2004)
AbstractFlower and fruit production of the abundant, tall, long-lived, dioecious, surface-pollinating seagrass species Enhalus acoroides (L.) Royle were estimated at seven sites in the reef flats off Bolinao (NW Luzon, The Philippines) featuring different fragmentation of the seagrass meadows. Fragmentation of the seagrass meadow was quantified as cover of E. acoroides and all seagrass species present in 20×20 m plots. E. acoroides and overall seagrass cover were correlated positively. The proportion of female flowers of E. acoroides that developed a fruit increased sharply as overall seagrass cover was around 50%. Apparent sex ratio bore no relationship with overall seagrass cover. This threshold-type of relationship suggests that fragmentation of seagrass meadows can have a major effect on the reproductive output of this species. A possible mechanism underlying these results would be a non-linear increase of the efficiency of trapping the surface-dispersed pollen with increasing seagrass canopy density. This provides the first evidence based on real data that fragmentation can affect the population dynamics of seagrass species.
Description8 pages, 3 figures.-- Short communication.-- Printed version published Nov 2004.
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