Environment or catches? Assessment of the decline in blackspot seabream (Pagellus bogaraveo) abundance in the Strait of Gibraltar

Sanz‐Fernández, Víctor; Gutiérrez‐Estrada, Juan Carlos; Pulido‐Calvo, Inmaculada; Gil‐Herrera, Juan; Benchoucha, Saïd; Arraf, S. El

doi:10.1016/j.jmarsys.2018.08.005

Cited by 9 publications

(8 citation statements)

References 57 publications

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“…However, these findings contrast with the results of our study which indicate that the effects of NAO on landings would only be concentrated in some particular years. These years coincide with the most volatile years in terms of landings (between 1993-1998 and 2007-2011, approximately), which would support the results of Gutiérrez-Estrada et al (2017) and Sanz-Fernández et al (2019). These authors reported that the Blackspot seabream abundance has low resilience to climatic-oceanic variability when the potential biomass is at low levels.…”

Section: Volatility and The Garch Family Of Modelssupporting

confidence: 73%

“…Water temperature anomaly (ºC) and NAO climate index were used as explanatory variables of the results produced by volatility (Báez et al., 2014; Gutiérrez‐Estrada et al., 2017; Sanz‐Fernández et al., 2019). The data on temperature (°C) were obtained for a monthly period of 33 years 1983–2015 from the Simple Ocean Data Assimilation (SODA) v 3.3.1 (http://www.atmos.umd.edu/%7Eocean).…”

Section: Methodsmentioning

confidence: 99%

“…Likewise, its geographical location makes it sensitive to atmospheric variations with ocean‐scale teleconnections. For example, different studies show how the North Atlantic Oscillation index (NAO) may have an effect on the Blackspot seabream abundance in the Strait of Gibraltar (Báez et al., 2014; Gutiérrez‐Estrada et al., 2017, 2020; Sanz‐Fernández et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

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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

Sanz‐Fernández

Gutiérrez‐Estrada

2020

Fisheries Oceanography

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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.

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Section: Volatility and The Garch Family Of Modelssupporting

confidence: 73%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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

Sanz‐Fernández

Gutiérrez‐Estrada

2020

Fisheries Oceanography

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“…For example Probst et al (2013) simulated the evolution of a cod stock over a 120-year period with the aim of identifying viable size-based indicators (SBIs) for the assessment of stock abundance. Likewise, Gutiérrez-Estrada et al (2017) and Sanz-Fernández et al (2019) obtained realistic simulations of the evolution of the abundance and biomass of Blackspot seabream (Pagellus bogaraveo) in the Strait of Gibraltar based on the information available on the biology of this species. From the simulated series these authors extracted time series of residuals that were correlated with environmental and climatic parameters, which allowed them to identify more or less favourable environmental periods with respect to the increase or decrease of the predicted abundance of this Blackspot seabream population.…”

Section: Introductionmentioning

confidence: 99%

“…The advantage of this type of approach is that the statistical correlations or functional relationships obtained do not depend on CPUE or LPUE time series. However, due to the nature of the time series of residues, they present the disadvantage of the difficulty in interpreting the correlations obtained (Sanz-Fernández et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Improving the interpretability of the effects of environmental factors on abundance of fish stocks

Gutiérrez‐Estrada

Sanz‐Fernández

Pulido‐Calvo

et al. 2020

Ecological Indicators

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Adequately assess the environmental effects on commercially exploited fish stocks is one of the main challenges faced by stock managers in their attempt to achieve ecosystemic management. In this study, we have developed a methodology which allows simulate the evolution of abundance or biomass of a fish population and calculate two indexes (the significant effect of the environmental parameter-EF-and the relative weight index-RW-) that improve the interpretability of the environmental effects on abundance of fish stocks. This methodology is based on the assumption that under the premise of environmental invariability the variation in the abundance of a population is linearly dependent on its abundance in the past. These indexes have been integrated into a decision support system namely SFish SubClass 1.1, specifically designed to disaggregate the effects of different environmental factors on a commercially exploited fish population. We have applied our model to the fishery of Pagellus bogaraveo in a complex environmental area (Strait of Gibraltar). The results show that the developed methodology provides plausible simulations. Finally, the RW and EF indexes indicated that the most influential variables were salinity, sea temperature and salinity flux.

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The Blackspot Seabream Fishery in the Strait of Gibraltar: Lessons and Future Perspectives of Shared Marine Resource

Gil‐Herrera

Gutiérrez‐Estrada

Benchoucha

et al. 2021

Alboran Sea - Ecosystems and Marine Resources

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Environment or catches? Assessment of the decline in blackspot seabream (Pagellus bogaraveo) abundance in the Strait of Gibraltar

Cited by 9 publications

References 57 publications

Historical changes of Blackspot seabream (Pagellus bogaraveo) landing patterns in the Strait of Gibraltar from 1983 to 2016: Environmental and legislation effects

Historical changes of Blackspot seabream (Pagellus bogaraveo) landing patterns in the Strait of Gibraltar from 1983 to 2016: Environmental and legislation effects

Improving the interpretability of the effects of environmental factors on abundance of fish stocks

The Blackspot Seabream Fishery in the Strait of Gibraltar: Lessons and Future Perspectives of Shared Marine Resource

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