INVESTIGADORES
PIZARRO Haydee Norma
artículos
Título:
Algal structure of the littoral epilithon in lentic water bodies of Hope Bay, Antarctic Peninsula.
Autor/es:
BONAVENTURA S.M.; A. VINOCUR; L. ALLENDE; H. PIZARRO
Revista:
POLAR BIOLOGY
Editorial:
Springer
Referencias:
Lugar: Berlin; Año: 2006 vol. 29 p. 668 - 680
ISSN:
0722-4060
Resumen:
Abstract We studied the composition and density of the
algae of the littoral epilithon and the taxa turnover in
nine lentic water bodies at Hope Bay, Antarctic Peninsula,
during summer 2002. At each site we measured the
main physical and chemical variables, and took epilithic
samples for the algal analysis. Two composed samples
(one for qualitative and one for quantitative analysis)
were taken randomly about 1 m away from the shoreline
of each sampling site. The morphology of the algal
mats could be included in the moat and pond type in
which Cyanobacteria are well represented. A total of 69
algal taxa were recorded in the whole study area.
Chlorophyceae showed the highest taxa richness (33%),
followed by Cyanobacteria (29%), Bacillariophyceae
(26%), Chrysophyceae (10%), and Tribophyceae (2%).
As a result of the redundancy analysis performed, we
found that the number, composition, and density of taxa
in the water bodies at Hope Bay were strongly influenced
by nitrate and suspended solids concentrations
and by the distance from the sea. The geographical trend
in taxa turnover within Hope Bay was explained by
elements from the combination of the metapopulation
dynamics and the continuum theories, which are related
to dispersal limitation and environmental heterogeneity,
respectively.We studied the composition and density of the
algae of the littoral epilithon and the taxa turnover in
nine lentic water bodies at Hope Bay, Antarctic Peninsula,
during summer 2002. At each site we measured the
main physical and chemical variables, and took epilithic
samples for the algal analysis. Two composed samples
(one for qualitative and one for quantitative analysis)
were taken randomly about 1 m away from the shoreline
of each sampling site. The morphology of the algal
mats could be included in the moat and pond type in
which Cyanobacteria are well represented. A total of 69
algal taxa were recorded in the whole study area.
Chlorophyceae showed the highest taxa richness (33%),
followed by Cyanobacteria (29%), Bacillariophyceae
(26%), Chrysophyceae (10%), and Tribophyceae (2%).
As a result of the redundancy analysis performed, we
found that the number, composition, and density of taxa
in the water bodies at Hope Bay were strongly influenced
by nitrate and suspended solids concentrations
and by the distance from the sea. The geographical trend
in taxa turnover within Hope Bay was explained by
elements from the combination of the metapopulation
dynamics and the continuum theories, which are related
to dispersal limitation and environmental heterogeneity,
respectively.