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Historical changes of Blackspot seabream (Pagellus bogaraveo) landing patterns in the Strait of Gibraltar from 1983 to 2016: Environmental and legislation effects
Fisheries Oceanography ( IF 2.6 ) Pub Date : 2020-09-20 , DOI: 10.1111/fog.12506
Víctor Sanz‐Fernández 1 , Juan Carlos Gutiérrez‐Estrada 1
Affiliation  

The Blackspot seabream (Pagellus bogaraveo) is one of the most important fishery resources in the region of the Strait of Gibraltar. The fishery of this demersal species, carried out by the Spanish and Moroccan artisanal fleets, is highly vulnerable to overexploitation whose effects can be enhanced by environmental and regulatory changes. This study evaluates from an univariate perspective the variation patterns of Blackspot seabream landings (from 1983 to 2016) in the Strait of Gibraltar and investigates the effects environmental factors (sea temperature anomaly and NAO index) and regulatory changes on the landings. For this purpose, we used a wide set of univariate seanonal and non‐seasonal approaches like Holt‐Winters, autoregressive integrated moving average (ARIMA) models and generalized autoregressive conditional heteroscedasticity (GARCH) models and submodels. The Holt‐Winters, autoregressive and ARIMA models were able to detect a strong linear dependence between current landings and previous landings as well as seasonal effects, while the GARCH models indicated the presence of intense uncertainty or volatility around two periods (1993–1998 and 2007–2011), associated with possible effects of underlying biological, environmental‐climatic and regulatory factors. Therefore, the use of a combination of univariate modelling techniques has enabled us to establish potential factors associated with the variability in the landings, which could significantly help move the management of this fishery towards an ecosystem‐based approach.

中文翻译:

1983年至2016年直布罗陀海峡黑点鲷(Pagellus bogaraveo)着陆方式的历史变化:环境和立法影响

黑点鲷(Pagellus bogaraveo)是直布罗陀海峡地区最重要的渔业资源之一。由西班牙和摩洛哥手工船队进行的这种沉没物种的捕捞极易受到过度开发的影响,其影响可通过环境和法规变化而得到加强。这项研究从单变量角度评估了直布罗陀海峡黑点鲷(1983年至2016年)着陆的变化模式,并研究了环境因素(海水温度异常和NAO指数)和调节变化对着陆的影响。为此,我们使用了多种单变量的季节和非季节方法,例如Holt-Winters,自回归综合移动平均(ARIMA)模型以及广义自回归条件异方差(GARCH)模型和子模型。Holt-Winters,自回归模型和ARIMA模型能够检测到当前降落与先前降落之间的强烈线性相关性以及季节性影响,而GARCH模型则表明在两个时期(1993-1998年和2007-2011年)之间存在强烈的不确定性或波动性以及潜在的生物学,环境气候和法规因素的影响。因此,使用单变量建模技术的组合使我们能够建立与上岸量变化相关的潜在因素,这可能会极大地帮助将这种渔业的管理方式转向基于生态系统的方法。而GARCH模型表明,在两个时期(1993-1998年和2007-2011年)附近存在强烈的不确定性或波动性,与潜在的生物学,环境气候和调节因素有关。因此,使用单变量建模技术的组合使我们能够建立与上岸量变化相关的潜在因素,这可能会极大地帮助将这种渔业的管理方式转向基于生态系统的方法。而GARCH模型表明,在两个时期(1993-1998年和2007-2011年)附近存在强烈的不确定性或波动性,与潜在的生物学,环境气候和调节因素有关。因此,使用单变量建模技术的组合使我们能够建立与上岸量变化相关的潜在因素,这可能会极大地帮助将这种渔业的管理方式转向基于生态系统的方法。
更新日期:2020-09-20
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