Environmental and fishery-driven dynamics of the common octopus (Octopus vulgaris) based on time-series analyses from leeward Algarve, southern Portugal

摘要: Dynamic factor analysis was used to explore monthly landings per unit effort (LPUE) series of Octopus vulgaris and environmental variables recorded in the southwest Iberian Peninsula, south Portugal. Despite large fluctuations octopus abundance series, results showed a strong aggregation pattern for last 3 months year, possibly related input new recruits fishery. The calculated common trend 12 time-series presented significant correlations with autumn rainfall previous year (lag 2 1), particularly October, November, December series. Other important were found Western Mediterranean Oscillation index Ekman transport, summer river run-off horizontal vertical component windstress, among others. main describes moderate steady increase LPUE during 10 years, suggesting that has increased from 1990 2010. together annual life cycle, suggest after environmentally controlled recruitment, population dynamics is largely fishery driven, resulting seasonality landings.