IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Macroalgae from intertidal pools associated with oyster beds in a north patagonian coast
Autor/es:
CROCE, M.E.; PARODI, E.R
Lugar:
La Plata
Reunión:
Congreso; CLABA 2012 Congreso Latinoamericano de Biotecnología Algal; 2012
Institución organizadora:
International Applied Phycology Society
Resumen:
Pools are suitable habitats for marine macroalgae, although they present restricted conditions which make them of particular interest while studying coastal communities. The establishment of Crassostrea gigas populations in the Northpatagonian Atlantic coast has lead to the formation of intertidal pools of different sizes and shapes along intertidal and subtidal habitats. The general objective of this study was to characterize these pools and to assess possible relationships between pool biodiversity and size, location, temperature and salinity of the pool. A total of 36 pools were sampled. Their species composition and macroalgal biomass were determined. Diversity was scarce compared with other Patagonian Atlantic coasts. Ten species were identified, and the red algae Polysiphonia abscissa showed the highest occurrence (more than 80% of the pools surveyed) and abundance (51.77 g m-2 winter dried weight; 12.26 g m-2 summer dried weight). Richness was higher in winter than in summer but diversity was higher in summer (Hs= 0.69; Hw= 0.26). Season and localization were the most determining factors structuring the macroalgal community. High temperature is a putative factor determining the development of P. abscissa populations, thus diversity was higher in summer as a consequence of the lower dominance of P. abscissa. The great availability of silicates in summer fostered the degree of diatom proliferation over the thalli of P. abscissa. Complete triphasic life cycles occurred in all red algal species found. Furthermore, the presence of carposporophytes indicated that sexual reproduction indeed occurred in all red algae species, although male specimens were never found.