INVESTIGADORES
ESCAPA carlos mauricio
congresos y reuniones científicas
Título:
DETRITUS PRODUCTION AND EXPORTATION OF AN ARGENTINEAN SALTMARSH: COMPARING TWO DOMINANT PLANT SPECIES
Autor/es:
DIANA I. MONTEMAYOR; MAURICIO ESCAPA; MARIANA ADDINO; FERNANDA ALVAREZ; EUGENIA FANJUL; OSCAR IRIBARNE
Lugar:
Bahía Blanca, Argentina
Reunión:
Congreso; ECSA 44. Science and Management of Estuaries and Coasts: A tale of two hemispheres.; 2008
Resumen:
Distribucin y efectos ecolgicos de la ostra introducida Crassostrea
gigas en Bahia Anegada
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In the SW
Atlantic (S of Brazil to N of Argentinean Patagonia) there are two
groups of saltmarshes: those dominated by Spartina densiflora (upper
intertidal area) and those where both S. densiflora (in an upper
intertidal level) and S. alterniflora (in a lower intertidal level; as
dominant species) are present. Both have different exposition to tides, and
thus likely different export rates of detritus. Our aim is to evaluate which of
the two plants contribute more detritus to coastal waters by comparing the
annual macrodetritus production and tidal detritus exportation of both species.
The study takes place in an Argentinean saltmarsh, in the Bahía Blanca estuary, where both species are
present. Annual macrodetritus production is estimated as the product between
primary production (NAPP) and turnover rate (TR). The TR is determined as the
ratio between NAPP and peak standing biomass. To determinate tidal litter
exportation ten plots were randomly chosen in the S. alterniflora dominated
saltmarsh and ten in the S. densiflora dominated saltmarsh. Twice per
month, during one year, 10 gr of painted detritus were introduced in each plot
and left during two complete tidal cycles. Painted detritus that remained in
the plot were collected. The results suggest that annual macrodetritus production
is higher for S. alterniflora than S. densiflora. Moreover S.
alterniflora could export more tidal detritus due to its relative position
in the intertidal. Thus, we hypothesize that marshes dominated by S.
alterniflora contribute larger amount of detritus to the coastal food web.