Long term variation of sardine Sardina pilchardus spawning along the Atlantic coast of northwest Africa (21–26°N): characterization and spatiotemporal variability in spawning habitat
Small pelagic fish such as sardine show strong recruitment variability often associated with environmental changes influencing the spawning process and ultimately, affecting population dynamics. Sardine (Sardina pilchardus, Walbaum 1792) is one of the most exploited pelagic species along the northwe...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-01-01
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| Series: | Oceanologia |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0078323420300658 |
| _version_ | 1818857220907991040 |
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| author | Hinde Abdelouahab Amina Berraho Tarik Baibai Jamila Larissi Said Charib Aziz Agouzouk Ahmed Makaoui Omar Ettahiri Ahmed Errhif |
| author_facet | Hinde Abdelouahab Amina Berraho Tarik Baibai Jamila Larissi Said Charib Aziz Agouzouk Ahmed Makaoui Omar Ettahiri Ahmed Errhif |
| author_sort | Hinde Abdelouahab |
| collection | DOAJ |
| description | Small pelagic fish such as sardine show strong recruitment variability often associated with environmental changes influencing the spawning process and ultimately, affecting population dynamics. Sardine (Sardina pilchardus, Walbaum 1792) is one of the most exploited pelagic species along the northwest African coast. The main spawning occurs during the cold season (autumn–winter). A time-series autumn–winter surveys extending from 1994 to 2015 sampled sardine eggs, along the southern area of the Moroccan Atlantic coast (26°N–21°N) were analyzed. The present work focuses on examining the inter-annual variability of the spawning habitat by analyzing the spatial-temporal variability of sardine egg distribution and density extracted from the data collected over the period 1994–2015. Generalized additive models (GAM) were used to detect the relationships between the sardine distribution, expressed as egg density and the presence or absence data and relevant hydrobiological environmental variables, such as salinity, temperature and zooplankton biomass. The generalized additive models showed significant relationships between the environment variables (SST, SSS and Zooplankton biomass) and sardine density, but not with sardine presence. Given that the study area is characterized by high mesoscale features and significant upwelling activities, the variability of upwelling processes could explain the changes of spawning ground position and thermal window. |
| first_indexed | 2024-12-19T08:36:56Z |
| format | Article |
| id | doaj.art-be89db7d6ca14eb38fca16cea875f3c7 |
| institution | Directory Open Access Journal |
| issn | 0078-3234 |
| language | English |
| last_indexed | 2024-12-19T08:36:56Z |
| publishDate | 2021-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Oceanologia |
| spelling | doaj.art-be89db7d6ca14eb38fca16cea875f3c72022-12-21T20:29:01ZengElsevierOceanologia0078-32342021-01-01631111Long term variation of sardine Sardina pilchardus spawning along the Atlantic coast of northwest Africa (21–26°N): characterization and spatiotemporal variability in spawning habitatHinde Abdelouahab0Amina Berraho1Tarik Baibai2Jamila Larissi3Said Charib4Aziz Agouzouk5Ahmed Makaoui6Omar Ettahiri7Ahmed Errhif8Institut National de Recherche Halieutique, Casablanca, Morocco; Corresponding author at: Institut National de Recherche Halieutique, 2 Bd Sidi Abderrahmane, Casablanca, Morocco.Institut National de Recherche Halieutique, Casablanca, MoroccoInstitut National de Recherche Halieutique, Casablanca, MoroccoInstitut National de Recherche Halieutique, Casablanca, MoroccoInstitut National de Recherche Halieutique, Casablanca, MoroccoInstitut National de Recherche Halieutique, Casablanca, MoroccoInstitut National de Recherche Halieutique, Casablanca, MoroccoInstitut National de Recherche Halieutique, Casablanca, MoroccoUniversity Hassan II of Casablanca, Faculty of Sciences, Ain Chock, Casablanca, MoroccoSmall pelagic fish such as sardine show strong recruitment variability often associated with environmental changes influencing the spawning process and ultimately, affecting population dynamics. Sardine (Sardina pilchardus, Walbaum 1792) is one of the most exploited pelagic species along the northwest African coast. The main spawning occurs during the cold season (autumn–winter). A time-series autumn–winter surveys extending from 1994 to 2015 sampled sardine eggs, along the southern area of the Moroccan Atlantic coast (26°N–21°N) were analyzed. The present work focuses on examining the inter-annual variability of the spawning habitat by analyzing the spatial-temporal variability of sardine egg distribution and density extracted from the data collected over the period 1994–2015. Generalized additive models (GAM) were used to detect the relationships between the sardine distribution, expressed as egg density and the presence or absence data and relevant hydrobiological environmental variables, such as salinity, temperature and zooplankton biomass. The generalized additive models showed significant relationships between the environment variables (SST, SSS and Zooplankton biomass) and sardine density, but not with sardine presence. Given that the study area is characterized by high mesoscale features and significant upwelling activities, the variability of upwelling processes could explain the changes of spawning ground position and thermal window.http://www.sciencedirect.com/science/article/pii/S0078323420300658SardineSpawning habitatEnvironmentTime seriesSea surface temperature |
| spellingShingle | Hinde Abdelouahab Amina Berraho Tarik Baibai Jamila Larissi Said Charib Aziz Agouzouk Ahmed Makaoui Omar Ettahiri Ahmed Errhif Long term variation of sardine Sardina pilchardus spawning along the Atlantic coast of northwest Africa (21–26°N): characterization and spatiotemporal variability in spawning habitat Oceanologia Sardine Spawning habitat Environment Time series Sea surface temperature |
| title | Long term variation of sardine Sardina pilchardus spawning along the Atlantic coast of northwest Africa (21–26°N): characterization and spatiotemporal variability in spawning habitat |
| title_full | Long term variation of sardine Sardina pilchardus spawning along the Atlantic coast of northwest Africa (21–26°N): characterization and spatiotemporal variability in spawning habitat |
| title_fullStr | Long term variation of sardine Sardina pilchardus spawning along the Atlantic coast of northwest Africa (21–26°N): characterization and spatiotemporal variability in spawning habitat |
| title_full_unstemmed | Long term variation of sardine Sardina pilchardus spawning along the Atlantic coast of northwest Africa (21–26°N): characterization and spatiotemporal variability in spawning habitat |
| title_short | Long term variation of sardine Sardina pilchardus spawning along the Atlantic coast of northwest Africa (21–26°N): characterization and spatiotemporal variability in spawning habitat |
| title_sort | long term variation of sardine sardina pilchardus spawning along the atlantic coast of northwest africa 21 26°n characterization and spatiotemporal variability in spawning habitat |
| topic | Sardine Spawning habitat Environment Time series Sea surface temperature |
| url | http://www.sciencedirect.com/science/article/pii/S0078323420300658 |
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