期刊
FISHERIES RESEARCH
卷 165, 期 -, 页码 121-126出版社
ELSEVIER
DOI: 10.1016/j.fishres.2014.12.020
关键词
Nephrops norvegicus; Northern Spain; Landing per unit effort; ARIMA model; Environmental factors
类别
资金
- Instituto Espanol de Oceanografia [BOE 06.10.2000]
Landings of Nephrops norvegicus from North Galicia (Northwest Spain) have decreased by 80% from 1975 to 2001. Variability in the landings per unit effort (LPUE) of this stock was investigated by using time series approach. The LPUE time series (1975-2001) exhibited a seasonal pattern. The seasonal decomposition of the LPUE showed a declining in the trend-cycle component from 1987 onwards. Univariate and dynamic regression ARMA models were fitted to the LPUE time series. Population (proportion of males, proportion of ovigerous females and recruits) and environmental variables (temperature, salinity, nitrates and chlorophyll at 70 m depth, upwelling and sea surface temperature) were tested at different lags as explanatory variables. The proportion of males 4 years ago was the key factor explaining LPUE fluctuations. (C) 2015 Elsevier B.V. All rights reserved.
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