Seasonal variations of phytoplankton assemblages in relation to environmental factors in Mediterranean coastal waters of Morocco, a focus on HABs species

Leblad, Benlahcen Rijal; Amnhir, Rachid; Sagou, Reqia; Sitel, Ferdaous; Daoudi, Mouna; Marhraoui, Mohamed; Abdellah, M K Ouelad; Véron, Benoı̂t; Er-Raioui, Hassan; Laabir, Mohamed

doi:10.1016/j.hal.2020.101819

Cited by 11 publications

(4 citation statements)

References 58 publications

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“…(Pearson's correlation: r 2 = 0.10, n = 49, p < 0.05) and bacteria (Pearson's correlation: r 2 = 0.13, n = 49, p < 0.05) were correlated with temperature in the SSW (Table ). This agreed with previous studies in which water temperature drove plankton blooms in coastal waters (Leblad et al., 2020). Moreover, meteorological conditions can contribute to the variability and cycling in the SML.…”

Section: Discussionsupporting

confidence: 94%

“…At the same time, the northern part of the YS is relatively closed, and is not conducive to water exchange (Yang et al., 2009). Hydrological factors such as mixing with nutrient‐rich freshwater during rainfall periods are known to impact the development of phytoplankton in an ecosystem, and these impacts might be exacerbated in closed systems (Leblad et al., 2020). Besides river input, erosion from deltaic and coastal regions is an important source of terrigenous DOM (Tao et al., 2016), further influencing the distribution of DOM in the coastal area.…”

Section: Discussionmentioning

confidence: 99%

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Controls on the Distribution, Enrichment, and Degradation of Dissolved Organic Matter in the Sea Surface Microlayer of the Yellow Sea and East China Sea

Chen

Zhang

et al. 2022

JGR Oceans

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The concentrations of dissolved organic carbon (DOC), dissolved organic nitrogen (DON), total dissolved carbohydrates (TDCHO), and total hydrolyzable amino acids (THAA) in the sea surface microlayer (SML) and subsurface water (SSW) were measured in the Yellow Sea and East China Sea. Concentrations of DOC and TDCHO in the SML were correlated with their respective concentrations in the SSW (Pearson's correlations: DOC, r2 = 0.17, n = 45, p < 0.01; TDCHO, r2 = 0.32, n = 45, p < 0.01). In contrast, DON and THAA concentrations in the SML and SSW were not correlated, suggesting that processes other than exchange with SSW dominated their loss or gain in the SML. Both THAA and TDCHO were significantly enriched in the SML, with mean enrichment factors (EFs) of 2.24 ± 1.17 and 1.98 ± 1.08, respectively. The EFs of dissolved organic matter (DOM) were not correlated with wind speed under the influence of complex processes (e.g., bubbling and turbulence). THAA‐C% and TDCHO‐C% in the SML were 3.38 ± 1.71% and 8.49 ± 4.81%, respectively, which were significantly higher than those in the SSW (Mann‐Whitney U test, p < 0.05), suggesting that DOM in the SML was fresher than that in the SSW. While the high bioavailability of DOM in the SML should be conducive to neuston proliferation in this unique environment, no significant correlations were observed between degradation indicators and neuston abundances. In contrast, the changes of temperature and pH may have an important impact on the degradation of DOM.

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Section: Discussionsupporting

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Controls on the Distribution, Enrichment, and Degradation of Dissolved Organic Matter in the Sea Surface Microlayer of the Yellow Sea and East China Sea

Chen

Zhang

et al. 2022

JGR Oceans

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“…Given the ongoing warming of Mediterranean waters, alongside the growth of aquaculture and tourism activities, national monitoring programs should prioritize BHAB species and emerging toxins. This is especially relevant given the current focus on PSTs, ASTs and LSTs associated with planktonic toxic species of the Alexandrium , Gymnodinium , Dinophysis and Pseudo-nitzschia genera [ 105 , 106 ].…”

Section: Discussionmentioning

confidence: 99%

“…These toxins and related intoxications were associated with proliferations of Gymnodinium catenatum , Pseudo-nitzschia spp., Dinophysis spp. and Prorocentrum lima , respectively [ 103 , 104 , 105 , 106 , 107 ]. Ibghi et al [ 34 ] documented the presence of Ostreopsis spp., C. monotis and P. lima during a one-year field study carried out in three sites covering the southern part of the Strait of Gibraltar.…”

Section: Introductionmentioning

confidence: 99%

Molecular Phylogeny, Morphology, Growth and Toxicity of Three Benthic Dinoflagellates Ostreopsis sp. 9, Prorocentrum lima and Coolia monotis Developing in Strait of Gibraltar, Southwestern Mediterranean

Ibghi,

Rijal Leblad,

L’Bachir El Kbiach

et al. 2024

Toxins

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Few works have been carried out on benthic harmful algal blooms (BHAB) species in the southern Mediterranean and no data are available for the highly dynamic Strait of Gibraltar (western Mediterranean waters). For the first time, Ostreopsis sp. 9, Prorocentrum lima and Coolia monotis were isolated in this key region in terms of exchanges between the Atlantic Ocean and the Mediterranean and subject to intense maritime traffic. Ribotyping confirmed the morphological identification of these three dinoflagellates species. Monoclonal cultures were established and the maximum growth rate and cell yield were measured at a temperature of 24 °C and an irradiance of 90 µmol photons m−2 s−1, for each species: 0.26 ± 0.02 d−1 (8.75 × 103 cell mL−1 after 28 days) for Ostreopsis sp. 9, 0.21 ± 0.01 d−1 (49 × 103 cell mL−1 after 145 days) for P. lima and 0.21 ± 0.01 d−1 (10.02 × 103 cell mL−1 after 28 days) for C. monotis. Only P. lima was toxic with concentrations of okadaic acid and dinophysistoxin-1 measured in optimal growth conditions ranging from 6.4 pg cell−1 to 26.97 pg cell−1 and from 5.19 to 25.27 pg cell−1, respectively. The toxin content of this species varied in function of the growth phase. Temperature influenced the growth and toxin content of P. lima. Results suggest that future warming of Mediterranean coastal waters may lead to higher growth rates and to increases in cellular toxin levels in P. lima. Nitrate and ammonia affected the toxin content of P. lima but no clear trend was noted. In further studies, we have to isolate other BHAB species and strains from Strait of Gibraltar waters to obtain more insight into their diversity and toxicity.

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Ecological Dynamics and Co-occurrences Among Prokaryotes and Microeukaryotes in a Diatom Bloom Process in Xiangshan Bay, China

Xie

Yan

et al. 2021

Microb Ecol

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Seasonal variations of phytoplankton assemblages in relation to environmental factors in Mediterranean coastal waters of Morocco, a focus on HABs species

Cited by 11 publications

References 58 publications

Controls on the Distribution, Enrichment, and Degradation of Dissolved Organic Matter in the Sea Surface Microlayer of the Yellow Sea and East China Sea

Controls on the Distribution, Enrichment, and Degradation of Dissolved Organic Matter in the Sea Surface Microlayer of the Yellow Sea and East China Sea

Molecular Phylogeny, Morphology, Growth and Toxicity of Three Benthic Dinoflagellates Ostreopsis sp. 9, Prorocentrum lima and Coolia monotis Developing in Strait of Gibraltar, Southwestern Mediterranean

Ecological Dynamics and Co-occurrences Among Prokaryotes and Microeukaryotes in a Diatom Bloom Process in Xiangshan Bay, China

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