Detalls de la publicació.


Autor(s):S. Murcia, J. Terrados, P. Ramírez-García, A. Mansilla
Títol:Phenology, biomass and productivity of sub-Antarctic Ruppia filifolia
JCR Impact Factor:1.711
Resum:Seagrasses play important ecological roles in
shallow coastal ecosystems from tropical to sub-polar seas.
Ruppia filifolia (Phil.) Skottsberg is the seagrass with the
world’s southernmost distribution but with virtually unknown
biology and ecology. The goal of this study was to identify the
ecological roles that R. filifolia might play in sub-Antarctic
environments through the assessment of the development and
primary productivity of this aquatic flowering plant. We
monitored biomass and shoot density, rhizome growth and the
presence of reproductive structures during 1 year in Skyring
Sound, sub-Antarctic Chile. Ruppia filifolia forms perennial
meadowswith high biomass (124–293 g DW m-2) and shoot
density (1800–5300 shoot m-2), a continuous presence of
vertical stems and a rhizome plus root to shoot biomass ratio
[1. Plant development shows a unimodal seasonal pattern
with flowering in spring, and fruiting and maximum growth
during summer. An average rhizome plastochrone of 37 days
and median rhizome elongation of 27.5 cm plant-1 year-1
rank R. filifolia as a slow-growing seagrass. Primary productivity
varied from 0.5 to 4.2 g DW m-2 day-1, resulting
in an annual primary production of 700 g DW m-2. Ruppia
filifolia in sub-Antarctic environments might play ecosystem
roles (carbon sequestration, sediment stabilization, structural
habitat, nutrition sources) as important as those played by
seagrasses in tropical or temperate coastal environments.

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