Resumo

BAYLON, Maribel et al. Spatial and temporal variation of phytoplankton with emphasis in algal blooms on fishermen crafts in front of a Beach at Chorrillos / Lima / Peru. Ecol. apl. [online]. 2019, vol.18, n.2, pp.133-143. ISSN 1726-2216.  http://dx.doi.org/10.21704/rea.v18i2.1332.

This study examined the spatial and temporal variability of the phytoplankton communities and their physicochemical variables in three stations at Pescadores Artesanales beach, located in Chorrillos (Lima, Peru). In situ measurements of temperature and pH were made every month for a year, while salinity and dissolved oxygen for half a year. Surface water samples were collected to determine the phytoplankton composition. A total of 120 phytoplanktonic taxa were identified, belonging to 46 families and 66 genera. Phytoplankton species were dominated by diatoms (59.2%) and dinoflagellates (35.6%). Phytoplankton abundance was dominated by the Raphidophyceae (73.72%) followed by dinoflagellates (11.75%), and nanoflagellates (11.53%). Algal blooms were formed by Thalassionema nitzschioides, Skeletonema costatum, Akashiwo sanguinea, Heterosigma akashiwo, Prorocentrum gracile, P. balticum, P. minimum, Scrippsiella acuminata, Dictyocha fibula, Leucocryptos marina and some nanoflagellates (< 20 µm). The highest phytoplankton abundance was observed in summer and autumn. Significant correlations were found between phytoplankton communities and physicochemical variables. Abiotic factors such as dissolved oxygen, temperature, salinity and pH favored the presence of algal blooms. Existence of potentially toxic / harmful phytoplankton species suggests a higher monitoring frequency of harmful algal blooms (FAN) at Pescadores Artesanales beach.

Palavras-chave : temporal variability; phytoplankton; algal blooms; Chorrillos.

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