VARIABILITÉ SAISONNIÈRE DE LA BIOMASSE DES PEUPLEMENTS MICROPHYTOPLANCTONIQUES DANS LES DIFFÉRENTS BASSINS DE LA SALINE DE SFAX, TUNISIE
The seasonal distribution (summer-autumn) of microphytoplankton biomass coupled with environmental factors was studied at four ponds of increasing salinity (A5, A16, C4-1, M2) in the solar saltern of Sfax. Subsamples for microphytoplankton (20–200 μm) counting were analysed under an inverted...
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| Format: | Article |
| Language: | English |
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Institut Marocain de l’Information Scientifique et Technique
2019-12-01
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| Series: | Journal of Water and Environmental Sciences |
| Subjects: | |
| Online Access: | https://revues.imist.ma/index.php/jwes/article/view/16177/10362 |
| _version_ | 1818558996880031744 |
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| author | Amira REKIK Sawssen BOUKHRIS Habib AYADI Jannet ELLOUMI |
| author_facet | Amira REKIK Sawssen BOUKHRIS Habib AYADI Jannet ELLOUMI |
| author_sort | Amira REKIK |
| collection | DOAJ |
| description | The seasonal distribution (summer-autumn) of microphytoplankton biomass coupled with environmental factors was studied at four ponds of increasing salinity (A5, A16, C4-1, M2) in the solar saltern of Sfax. Subsamples for microphytoplankton (20–200 μm) counting were analysed under an inverted microscope using the Utermöhl method after settling for 24 to 48 hr (Utermöhl, 1958). The results obtained during this study explain the importance of salinity in the microphytoplankton communities’ structure. Microphytoplankton biomass values show a large range of variations since they fluctuate from 23.47 μgC l-1(M2) to 753.35 μgC l-1(C4-1) during the autumn season. Low microphytoplankton biomasses were recorded during the summer (min = 35.89 -max = 293.48 μgC l-1) at ponds C4-1 and A5 respectively.The microphytoplankton community consists of 68 taxa belonging to five groups composed of diatoms, dinoflagellates, cyanobacteria, chlorophyceae and euglenophyceae. Diatoms and dinoflagellates account for more than 80% ofthe total microphytoplankton biomass at ponds A5,A16 and C4-1. Microphytoplankton was characterised by the proliferation of pinnate diatoms(Navicula sp. et Nitzschia sp.) andGymnodinium sp., Prorocentrum micans, Ackashiwo sanguineaand Peridiniumsp. for dinoflagellates. In the hypersaline ponds (M2), cyanobacteria (Oscillatoriasalina, Aphanothece halophytica, Phormidiumversicolorand Spirulina subsalsa)and mainly chlorophyceae (Chlamydomonas rubrifilumand Dunaliella salina) showed the highest biomasses 49% for cyanobacteria and 16% for chlorophyceae during autumn. There was a clear spatial and seasonal variation in microphytoplankton communities and it was noted that species richness and biomass decreased with the increasing salinity gradient. |
| first_indexed | 2024-12-14T00:19:36Z |
| format | Article |
| id | doaj.art-186cef9c97424bbda751922796c501d5 |
| institution | Directory Open Access Journal |
| issn | 2509-0445 |
| language | English |
| last_indexed | 2024-12-14T00:19:36Z |
| publishDate | 2019-12-01 |
| publisher | Institut Marocain de l’Information Scientifique et Technique |
| record_format | Article |
| series | Journal of Water and Environmental Sciences |
| spelling | doaj.art-186cef9c97424bbda751922796c501d52022-12-21T23:25:17ZengInstitut Marocain de l’Information Scientifique et TechniqueJournal of Water and Environmental Sciences2509-04452019-12-0131485498VARIABILITÉ SAISONNIÈRE DE LA BIOMASSE DES PEUPLEMENTS MICROPHYTOPLANCTONIQUES DANS LES DIFFÉRENTS BASSINS DE LA SALINE DE SFAX, TUNISIEAmira REKIK0Sawssen BOUKHRIS1Habib AYADI2Jannet ELLOUMI3Université de Sfax, Faculté des Sciences de Sfax, Département des Sciences de la Vie. Laboratoire BIOME LR/18ES30 Biodiversité Marine et Environnement.Route Soukra Km 3,5 –BP 1171 –CP 3000 Sfax, TunisieUniversité de Sfax, Faculté des Sciences de Sfax, Département des Sciences de la Vie. Laboratoire BIOME LR/18ES30 Biodiversité Marine et Environnement.Route Soukra Km 3,5 –BP 1171 –CP 3000 Sfax, TunisieUniversité de Sfax, Faculté des Sciences de Sfax, Département des Sciences de la Vie. Laboratoire BIOME LR/18ES30 Biodiversité Marine et Environnement.Route Soukra Km 3,5 –BP 1171 –CP 3000 Sfax, TunisieUniversité de Sfax, Faculté des Sciences de Sfax, Département des Sciences de la Vie. Laboratoire BIOME LR/18ES30 Biodiversité Marine et Environnement.Route Soukra Km 3,5 –BP 1171 –CP 3000 Sfax, TunisieThe seasonal distribution (summer-autumn) of microphytoplankton biomass coupled with environmental factors was studied at four ponds of increasing salinity (A5, A16, C4-1, M2) in the solar saltern of Sfax. Subsamples for microphytoplankton (20–200 μm) counting were analysed under an inverted microscope using the Utermöhl method after settling for 24 to 48 hr (Utermöhl, 1958). The results obtained during this study explain the importance of salinity in the microphytoplankton communities’ structure. Microphytoplankton biomass values show a large range of variations since they fluctuate from 23.47 μgC l-1(M2) to 753.35 μgC l-1(C4-1) during the autumn season. Low microphytoplankton biomasses were recorded during the summer (min = 35.89 -max = 293.48 μgC l-1) at ponds C4-1 and A5 respectively.The microphytoplankton community consists of 68 taxa belonging to five groups composed of diatoms, dinoflagellates, cyanobacteria, chlorophyceae and euglenophyceae. Diatoms and dinoflagellates account for more than 80% ofthe total microphytoplankton biomass at ponds A5,A16 and C4-1. Microphytoplankton was characterised by the proliferation of pinnate diatoms(Navicula sp. et Nitzschia sp.) andGymnodinium sp., Prorocentrum micans, Ackashiwo sanguineaand Peridiniumsp. for dinoflagellates. In the hypersaline ponds (M2), cyanobacteria (Oscillatoriasalina, Aphanothece halophytica, Phormidiumversicolorand Spirulina subsalsa)and mainly chlorophyceae (Chlamydomonas rubrifilumand Dunaliella salina) showed the highest biomasses 49% for cyanobacteria and 16% for chlorophyceae during autumn. There was a clear spatial and seasonal variation in microphytoplankton communities and it was noted that species richness and biomass decreased with the increasing salinity gradient.https://revues.imist.ma/index.php/jwes/article/view/16177/10362saltworksmicrophytoplanktonbiomassphysicochemicals |
| spellingShingle | Amira REKIK Sawssen BOUKHRIS Habib AYADI Jannet ELLOUMI VARIABILITÉ SAISONNIÈRE DE LA BIOMASSE DES PEUPLEMENTS MICROPHYTOPLANCTONIQUES DANS LES DIFFÉRENTS BASSINS DE LA SALINE DE SFAX, TUNISIE Journal of Water and Environmental Sciences saltworks microphytoplankton biomass physicochemicals |
| title | VARIABILITÉ SAISONNIÈRE DE LA BIOMASSE DES PEUPLEMENTS MICROPHYTOPLANCTONIQUES DANS LES DIFFÉRENTS BASSINS DE LA SALINE DE SFAX, TUNISIE |
| title_full | VARIABILITÉ SAISONNIÈRE DE LA BIOMASSE DES PEUPLEMENTS MICROPHYTOPLANCTONIQUES DANS LES DIFFÉRENTS BASSINS DE LA SALINE DE SFAX, TUNISIE |
| title_fullStr | VARIABILITÉ SAISONNIÈRE DE LA BIOMASSE DES PEUPLEMENTS MICROPHYTOPLANCTONIQUES DANS LES DIFFÉRENTS BASSINS DE LA SALINE DE SFAX, TUNISIE |
| title_full_unstemmed | VARIABILITÉ SAISONNIÈRE DE LA BIOMASSE DES PEUPLEMENTS MICROPHYTOPLANCTONIQUES DANS LES DIFFÉRENTS BASSINS DE LA SALINE DE SFAX, TUNISIE |
| title_short | VARIABILITÉ SAISONNIÈRE DE LA BIOMASSE DES PEUPLEMENTS MICROPHYTOPLANCTONIQUES DANS LES DIFFÉRENTS BASSINS DE LA SALINE DE SFAX, TUNISIE |
| title_sort | variabilite saisonniere de la biomasse des peuplements microphytoplanctoniques dans les differents bassins de la saline de sfax tunisie |
| topic | saltworks microphytoplankton biomass physicochemicals |
| url | https://revues.imist.ma/index.php/jwes/article/view/16177/10362 |
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