Temperature and food-mediated variability of European Atlantic sardine recruitment

Garrido, Susana; Silva, Alexandra; Marques, Vítor; Figueiredo, Ivone; Bryère, Philippe; Mangin, Antoine; Santos, A. Miguel P.

doi:10.1016/j.pocean.2017.10.006

Cited by 44 publications

(38 citation statements)

References 39 publications

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“…Garrido et al. () found that high recruitment years of the Iberian sardine were mostly related to high food availability, particularly during the last quarter of the previous year, that is, during autumn.…”

Section: Discussionmentioning

confidence: 99%

“…Hence, this could negatively affect larval food availability (Huntsman & Barber, 1977;Lasker, 1975). Garrido et al (2017) found that high recruitment years of the Iberian sardine were mostly related to high food availability, particularly during the last quarter of the previous year, that is, during autumn. (2015) found that total zooplankton abundance in the Ría de Vigo and adjacent shelf declined between 1995 and 2001.…”

Section: Loadingsmentioning

confidence: 99%

“…More previous works have studied the relationship between environmental conditions and sardine dynamics in the Iberian shelf ecosystem (e.g., Santos et al., ; Garrido et al., ; Quattrocchi & Maynou, ; Malta, Santos, Santos, Rufino, & Silva, ; Leitão et al., ; Santos et al., , ; Borges, Santos, Crato, Mendes, & Mota, ). The originality of this study is that it employs a different methodology never used in this region before, takes into account the entire southern sardine stock and exploits an updated data series.…”

Section: Introductionmentioning

confidence: 99%

“…Sardine catches present decadal cycles such as many environmental variables (Alheit, Roy, & Kifani, 2009). In the late 1990s, Iberian sardine stock entered a second consecutive negative period (Garrido et al, 2017;Guisande, Vergara, Riveiro, & Cabanas, 2004) from which it has not yet recovered.…”

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confidence: 99%

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Study of sardine (Sardina pilchardus) regime shifts in the Iberian Atlantic shelf waters

Cabrero

González-Nuevo

Gago

et al. 2018

Fisheries Oceanography

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Sardine fisheries in the Iberian Atlantic shelf (36°N–44.5°N) show decadal‐scale cycles. In the late 1990s, a positive phase in sardine stock was expected; on the contrary, catches have declined until now. Regime shifts in climatic and oceanographic variables on different scales (as forcing factor) and shifts in sardine stock (as result) have been used with the aim of identifying the physical variables that explain most of the sardine population variance in the region. Circa 1998, when last sardine regime shift was detected, the main patterns of large‐scale atmospheric circulation in the Northern Hemisphere with influence in the study area namely Northern Atlantic Oscillation (NAO) and East Atlantic (EA) pattern changed and coupled in a combination that led to a rise in sea surface temperature and a decline in the coastal upwelling intensity. Several years with a downwelling situation in average in the main spawning and feeding Iberian sardine areas would have affected the stock abundance, averting the return to the projected positive regime. The sardine negative regime shift was detected first in the regions of the study located further north. The regional variable latent heat flux that groups a set of environmental processes related to the ocean–atmosphere heat exchanges and so with the turbulence manages to explain the 72% of sardine recruitment.

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Section: Discussionmentioning

confidence: 99%

Section: Loadingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Study of sardine (Sardina pilchardus) regime shifts in the Iberian Atlantic shelf waters

Cabrero

González-Nuevo

Gago

et al. 2018

Fisheries Oceanography

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“…Denmark strait (temperature, salinity, water flow; internal data, IMR), Faroe-Shetland channel (temperature, salinity, water flow; internal data, IMR), Irminger current (I. Nunez-Riboni, von Thünen Institut, personal communication), Iceland-Faroe ridge (internal data, IMR), NCC (Skagseth et al, 2015) Currents determine nutrient distribution, ecosystem productivity, drift patterns of early life stages and recruitment (Checkley, Raman, Maillet, & Mason, 1988), for example, Icelandic and Faroese circular current (Astthorsson & Gislason, 1995;ICES, 2015), NCC (Skagseth, Drinkwater, & Terrile, 2011;Skagseth et al, 2015); beneficial transport effects for egg and larval development (Opdal & Jørgensen, 2015) East Atlantic Pattern EAP index (National Oceanic and Atmospheric Administration, 2017) Major forcing factor in the eastern Atlantic Ocean (Stenseth et al, 2003), linked to, for example, down-/upwelling in the Bay of Biscay and off the Iberian coast with effects on recruitment in European hake (Sanchez, Sánchez, Landa, & Fernandez, 2003;Sánchez et al, 2003), megrim and four-spotted megrim (Sanchez et al, 2003), horse mackerel and sardine (Guisande, Cabanas, Vergara, & Riveiro, 2001;Santos, de Fátima Borges, & Groom, 2001) and anchovy (Borja, Fontan, Sáenz, & Valencia, 2008;Borja, Uriarte, Egaña, Motos, & Valencia, 1998) Food availability Zooplankton indices (Dalpadado et al, 2014), stock biomass and cohort abundance Food availability crucial for growth and survival of early life stages and therefore recruitment (Bergenius, Meekan, Robertson, & McCormick, 2002;Cushing, 1990;Garrido et al, 2017;Hüssy, St. John, & Böttcher, 1997;Le Pape & Bonhommeau, 2015) North Atlantic Oscillation NAO index (National Center for Atmospheric Research, 2017a)…”

Section: Variables Indices Hypothesesmentioning

confidence: 99%

Common trends in recruitment dynamics of north‐east Atlantic fish stocks and their links to environment, ecology and management

2019

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Recruitment dynamics are challenging to assess or predict because of the many underlying drivers that vary in their relevance over time and space. Stock size, demographic and trait composition, condition and distribution of spawning fish and the spatio‐temporal dynamics of trophic and environmental interactions all influence recruitment processes. Exploring common patterns among stocks and linking them to potential drivers may therefore provide insights into key mechanisms of recruitment dynamics. Here, we analysed stock‐recruitment data of 64 stocks from the north‐east Atlantic Ocean for common trends in variation and synchrony among stocks using correlation, cluster and dynamic factor analyses. We tested common trends in recruitment success for relationships with large‐scale environmental processes as well as stock state indicators, and we explored links between recruitment success and demographic, environmental and ecological variables for a subset of individual stocks. The results revealed few statistically significant correlations between stocks but showed that underlying common trends in recruitment success are linked to environmental indices and management indicators. Statistical analyses confirmed previously suggested relationships of environmental–ecological factors such as the subpolar gyre and Norwegian coastal current with specific stocks, and indicated a large relevance of spawning stock biomass and demographics, as well as predation, whereas other suggested relationships were not supported by the data. Our study shows that despite persistent challenges in determining drivers of recruitment due to poor data quality and unclear mechanisms, combining different data analysis techniques can improve our understanding of recruitment dynamics in fish stocks.

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Genomic analysis of NE Atlantic sardine (Sardina pilchardus) reveals reduced variation in a recently established North Sea population and directs reconsideration of management units

McKeown,

Campanella,

Silva

et al. 2024

Ecology and Evolution

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The European sardine (Sardina pilchardus) is under intense fishing pressure and exhibits distributional/abundance shifts linked to environmental change. The current understanding of population demographics needed for sustainable management is uncertain due to concerns that previous genetic studies lacked resolution and limited sampling of sardine north of the Bay of Biscay. To address these issues, we performed mtDNA sequencing and genome wide SNP analysis of samples collected across the Bay of Biscay, Celtic Sea, English Channel and North Sea. The complete SNP data reported a lack of structure throughout the sampled area compatible with high gene flow. A consensus suite of positive outlier SNPs was identified which reported a significant correlation with geographical distance with the largest differentiation between the southern Bay of Biscay and North Sea samples which also reported a significant mtDNA ΦST. While the roles of dispersal limitation and environmental heterogeneity underpinning this require further study, this adds to growing evidence that selection is influencing sardine population structure against a background of high gene flow. The results indicate that while there may be a level of demographic independence between North Sea and South Biscay sardine, the current delimitation of central (Biscay) and northern (Channel and Celtic Sea) operational stocks may misrepresent connectivity between the Biscay and Channel. The North Sea sample exhibited markedly lower mtDNA and nuclear variation than other samples. As sardine have only recently invaded the North Sea such reduced genetic variation is compatible with predictions for peripheral leading‐edge populations but contrasts with patterns for other small pelagic species and emphasises the need to consider species‐specific genetic structure in ecosystem‐based management. Nascent management of the North Sea sardine fishery must ensure that current low levels of genetic diversity are not eroded further as this may decrease the species adaptive potential and inhibit its expansion.

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Temperature and food-mediated variability of European Atlantic sardine recruitment

Cited by 44 publications

References 39 publications

Study of sardine (Sardina pilchardus) regime shifts in the Iberian Atlantic shelf waters

Study of sardine (Sardina pilchardus) regime shifts in the Iberian Atlantic shelf waters

Common trends in recruitment dynamics of north‐east Atlantic fish stocks and their links to environment, ecology and management

Genomic analysis of NE Atlantic sardine (Sardina pilchardus) reveals reduced variation in a recently established North Sea population and directs reconsideration of management units

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