Publication details.


Author(s):J. Marambio, F. Mendez, P. Ocaranza, J.P. Rodriguez, S. Rosenfeld, J. Ojeda, S. Murcia, J. Terrados, K. Bischof, A. Mansilla,
Title:Seasonal variations of the photosynthetic activity and pigment concentrations in different reproductive phases of Gigartina skottsbergii (Rhodophyta, Gigartinales) in the Magellan region, sub-Antarctic Chile
JCR Impact Factor:2.401
Issue No.:2
Abstract:Seasonal environmental changes may significantly
influence macroalgal diversity and biomass. Cryptogam species
richness increases towards the poles, especially in sub-
Antarctic environments. Yet, subpolar seaweed biodiversity
and ecophysiology remain understudied even though it is essential
for the management and sustainability of endemic species
of significant economic interest (e.g., Gigartina
skottsbergii). We evaluate the seasonality and ecophysiology
of the different life phases of the rhodophyte G. skottsbergii by
analyzing variation in fluorescence yield and photosynthetic
pigment composition. There were significant seasonal differences
in maximum relative electron transport rate (rETRmax)
between gametophyte and tetrasporophyte phase, and between
reproductive and vegetative specimens. Photosynthetic efficiency
(α) was not significantly different between reproductive
states of G. skottsbergii. We found significant differences in
mean concentrations of allophycocyanin (APC), phycocyanin
(PC), and chlorophyll a (Chl a) between gametophyte and
tetrasporophyte phases. Results obtained provide new insight
into seasonal acclimation patterns of an ecologically important
species, which can be used for the design of appropriate management
and cultivation strategies of G. skottsbergii towards
the restoration of natural populations in fragile, subpolar regions
where some of the last, relatively undisturbed communities
of G. skottsbergii still remain.

Related staff

  • Jorge Terrados Muñoz
  • Related research groups

  • Marine Ecosystems Dynamics