Coupling oceanic mesoscale events with catches of the Pacific sardine (Sardinops sagax) in the Gulf of California

Farach-Espinoza, Edgardo Basilio; López‐Martínez, Juana; García‐Morales, Ricardo; Nevárez-Martı́nez, Manuel O.; Ortega‐García, Sofia; Lluch‐Cota, Daniel B.

doi:10.1016/j.pocean.2022.102858

Cited by 3 publications

(3 citation statements)

References 52 publications

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“…The GC is an area that exhibits high biological productivity [1,2,35] and is affected by the presence of remote forcing, which is mainly associated with ENSO signals. The climate variability due to ENSO events in the GC has been studied, but strong controversy remains about the ecological impacts of ENSO [1,5,9,10,76,78]. The biophysical coupling between Chl-a and SST was found (Figures 7 and 8).…”

Section: Discussionmentioning

confidence: 99%

“…It is one of the marine systems that is most closely observed by the worldwide conservation sector, and there is a scientific research focus on the detection of the impacts of anthropogenic climate change on coastal ecosystems, including on some small pelagic fish, shrimps, and jellyfish [2,[5][6][7][8][9]. Variations in these ecosystems have been attributed to large fishing efforts, overfishing, and environmental factors, which can alter natural mortality in early life stages and have effects on new-generation recruitment in the adult fish population [10] in addition to the potential entry of invasive species. Circulation studies have indicated that the combined action of wind forcing, the PO's influence at the gulf's mouth, tides, and solar radiation creates a typical circulation pattern, resulting in anticyclonic circulation during the winter and cyclonic circulation during the summer [11,12], which suggests that inflow occurs next to the southern coast of the mainland and that outflow occurs next to the tip of the coast of the BCP.…”

Section: Introductionmentioning

confidence: 99%

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Long-Term Variability in Sea Surface Temperature and Chlorophyll a Concentration in the Gulf of California

López Martínez,

Farach Espinoza,

Herrera Cervantes

et al. 2023

Remote Sensing

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The Gulf of California (GC) is the only interior sea in the Eastern Pacific Ocean and is the most important fishing area in the northwestern region of the Mexican Pacific. This study focuses on the oceanographic variability of the GC, including its southern portion, which is an area with a high flow of energy and exchange of properties with the Pacific Ocean (PO), in order to determine its role in physical–biological cycles and climate change. The purpose of this work is to analyze the sea surface temperature (SST) and chlorophyll a concentration (Chl-a) during the period from 1998–2022 as indicators of long-term physical and biological processes, oceanographic variability, and primary production in the GC. In total, 513 subareas in the GC were analyzed, and a cluster analysis was applied to identify similar areas in terms of SST and Chl-a via the K-means method and using the silhouette coefficient (>0.5) as a metric to validate the clusters obtained. The trends of the time series of both variables were analyzed, and a fast Fourier analysis was performed to evaluate cycles in the series. A descriptive analysis of the SST and Chl-a series showed that the SST decreased from south to north. Six bioregions were identified using a combined of both SST and Chl-a data. The spectral analysis of the SST showed that the main frequencies in the six bioregions were annual and interannual (3–7 years), and the frequencies of their variations were associated with basin-level weather events, such as El Niño and La Niña. The SST in the GC showed a heating trend at an annual rate of ~0.036 °C (~0.73 °C in 20 years) and a decrease in Chl-a at an annual rate of ~0.012 mg/m3 (~0.25 mg/m3 in 20 years), with potential consequences for communities and ecosystems. Additionally, cycles of 10–13 and 15–20 years were identified, and the 10–13-year cycle explained almost 40–50% of the signal power in some regions. Moreover, mesoscale features (eddies and filaments) were identified along the GC, and they were mainly associated with the clusters of the SST. All these spatial and temporal variabilities induce conditions that generate different habitats and could explain the high biodiversity of the GC. If the warming trend of the SST and the decreasing trend of the Chl-a continue in the long term, concerns could be raised, as they can have important effects on the dynamics of this important marine ecosystem, including habitat loss for numerous native species, declines in the catches of the main fishery resources, and, consequently, support for the arrival of harmful invasive species.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Long-Term Variability in Sea Surface Temperature and Chlorophyll a Concentration in the Gulf of California

López Martínez,

Farach Espinoza,

Herrera Cervantes

et al. 2023

Remote Sensing

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“…The ocean front has high gradients of temperature, density, and nutrients and is one of the most important regions for the exchange of ocean heat, gas (i.e., oxygen and greenhouse gases), energy, and material, as well as the distribution of biological resources (Behrens et al., 2021; Wang et al., 2021), playing an important role in global climate change (Chapman et al., 2020; Ferrari, 2011). More importantly, ocean fronts act as oases in the ocean because of their convergence effect that converges nutrients and other substances from different water masses, which is favorable for phytoplankton growth and thus contributes significantly to regional and global ecosystem productivity (Farach‐Espinoza et al., 2022; Ito et al., 2023; Li et al., 2022; Woodson & Litvin, 2015). Therefore, ocean fronts play an important role in marine ecology (Feuilloley et al., 2020; Prants, 2022), such as fishing grounds (Oh et al., 2020; Prants, 2022; Woodson & Litvin, 2015).…”

Section: Introductionmentioning

confidence: 99%

Global Warming Weakens the Ocean Front and Phytoplankton Blooms in the Luzon Strait Over the Past 40 years

Lao,

Liu,

Wang

et al. 2023

JGR Biogeosciences

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The Luzon Strait is a channel where warmer Kuroshio water from the Pacific Ocean intrudes into the South China Sea (SCS). Under climate change impact, the temperature in marginal seas, including the SCS, rises faster than in open oceans. We speculated that the variation of frontal intensity and its eco‐environmental impact in the Luzon Strait may be different from coastal waters, whose frontal intensity is increasing, thus stimulating phytoplankton growth. To confirm this speculation, 40‐year satellite, and multiple data sources were analyzed in the Luzon Strait. The results showed that strong frontal intensity (front coverage of over 60%) and higher Chlorophyll a content occurred simultaneously in the Luzon Strait during the winter monsoon period. Phytoplankton blooms were enhanced during El Niño years because the stronger Kuroshio intrusion generated stronger fronts and intensified local upwelling in the Luzon Strait. On an interannual scale, the frontal intensity and phytoplankton growth exhibited a significantly decreasing trend in the Luzon Strait over the past 40 years, since the faster warming in the SCS reduced the temperature difference between the Pacific Ocean and the SCS. Warming and weakening fronts reduced the mixed layer depth to the oligotrophic layer, thus limiting the phytoplankton growth. This study confirmed that faster temperature rises in marginal seas reduced the frontal intensity and phytoplankton growth in the strait between oceans and marginal seas.

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Effects of Mesoscale Eddies on the Fish Community in the Western South China Sea

Yu,

Tang,

Chen

et al. 2023

Preprint

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Coupling oceanic mesoscale events with catches of the Pacific sardine (Sardinops sagax) in the Gulf of California

Cited by 3 publications

References 52 publications

Long-Term Variability in Sea Surface Temperature and Chlorophyll a Concentration in the Gulf of California

Long-Term Variability in Sea Surface Temperature and Chlorophyll a Concentration in the Gulf of California

Global Warming Weakens the Ocean Front and Phytoplankton Blooms in the Luzon Strait Over the Past 40 years

Effects of Mesoscale Eddies on the Fish Community in the Western South China Sea

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