PARODI Elisa Rosalia
SEASONAL DYNAMICS OF MACROALGAE IN INTERTIDAL POOLS ALONG BEDS OF CRASSOSTREA GIGAS (MOLLUSCA, BIVALVIA) FROM THE NORTHPATAGONIAN ATLANTIC COAST
CROCE, M.E.; PARODI, E.R
WALTER DE GRUYTER & CO
Lugar: Halifax; Año: 2012 vol. 55 p. 49 - 58
Intertidal pools represent restricted habitats for macroalgae communities, and their structure is determined by physical factors. The establishment of the exotic oyster Crassostrea gigas in the Northpatagonian Atlantic coast, led to the formation of intertidal pools, which constitute appropriate habitats for macroalgae settlement. The present study aimed to determine the composition, distribution and abundance of the macroalgae community inhabiting these pools, and to establish the structuring variables. Several biotic and abiotic variables were evaluated in 36 pools in winter and summer. Correlations were calculated and permutation analysis of variance and constrained redundancy analysis were conducted to determine the structuring factors. Unlike other Patagonian coasts, richness was low and pools were characterized by the dominance of red algae. Richness was higher in winter, while diversity was lower due to the dominance of Polysiphonia abscissa, which presented the highest percentage of occurrence. Temperature was the putative factor determining seasonal richness and diversity. Area and height were structuring factors for community biomass. The present study revealed distinct community dynamics. Gelidium sp. and Rhodomela sp. withstanding summer stress as dense turfs, while P. abscissa develops large populations in winter, which decline towards the summer.