Thalasse Tchémangnihodé Avocegan

Université d'Abomey-Calavi

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Olaègbè Victor Okpeitcha

Université d'Abomey-Calavi

Hervé Hotèkpo Akodogbo

Université d'Abomey-Calavi

Fridolin Ubald Dossou-Sognon

Université d'Abomey-Calavi

François Talomonwo Ouinsou

Université d'Abomey-Calavi

Alexis Chaigneau

Université d'Abomey-Calavi

Yves Morel

Hospices Civils de Lyon

Frédéric Azémar

Centre National de la Recherche Scientifique

Junior Patric Kouglo

Université d'Abomey-Calavi

Metogbe Belfrid Djihouessi

Université d'Abomey-Calavi

Zacharie Sohou

Institut National des Recherches Agricoles du Bénin

Cooperative Institutions

Université d'Abomey-Calavi

Institut de Recherche pour le Développement

Institut National des Recherches Agricoles du Bénin

Université de Toulouse

Université Toulouse III - Paul Sabatier

Centre National de la Recherche Scientifique

Laboratoire d’Études en Géophysique et Océanographie Spatiales

École Polytechnique

Hospices Civils de Lyon

Service Hydrographique et Océanographique de la Marine

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Tidal Impacts on Zooplankton Dynamics in a Major Ocean-Lagoon Channel: Insights from a 25-Hour Intensive Survey in the Cotonou Channel, Benin

Journal of Marine Science and Engineering (2024)

Hervé Hotèkpo Akodogbo Fridolin Ubald Dossou-Sognon François Talomonwo Ouinsou Thalasse Tchémangnihodé Avocegan Junior Patric Kouglo

This study investigates the effects of tidal cycles on the zooplankton community within the Cotonou Channel, an important waterway connecting the large Nokoué Lagoon to the Atlantic Ocean in Benin. From the determination of zooplankton composition from 25-hour samples collected in July 2020, alpha diversity indices and abundance were assessed, while relationships between biotic and abiotic parameters were analyzed through Pearson correlation, analysis of variance, and principal component analysis. A total of 66 zooplankton taxa were identified, with rotifers exhibiting the highest species richness (35 taxa), while copepods dominated in abundance (71%). Zooplankton abundance varied significantly, ranging from 2 to 95 ind L−1 depending on the tidal phase. A negative correlation was found between species richness (r = −0.51, p < 0.01) and increasing salinity (3–37), indicating that higher salinity reduced diversity (r = 0.06, p > 0.05). Resilient species like Synchaeta bicornis persisted despite salinity changes. The tidal cycle structurally altered the zooplankton community, with abundance and diversity peaking at different phases, notably higher at high tide (15 ind L−1.) These initial findings underscore the complex interactions between tidal dynamics and estuarine biodiversity, suggesting the need for further research across different tidal and seasonal conditions to inform effective management and conservation efforts.

10.3390/jmse12091519

Cite

Citations (0)

Physicochemical Drivers of Zooplankton Seasonal Variability in a West African Lagoon (Nokoué Lagoon, Benin)

Journal of Marine Science and Engineering (2023)

Alexis Chaigneau François Talomonwo Ouinsou Hervé Hotèkpo Akodogbo Gauthier Dobigny Thalasse Tchémangnihodé Avocegan

This study aimed to investigate the seasonal variation of zooplankton diversity and abundance in the Nokoué Lagoon in southern Benin. Through extensive sampling, a total of 109 zooplanktonic taxa were identified and quantified. The average zooplankton abundance was found to be 60 individuals per liter, with copepods and rotifers being the most dominant groups, comprising 68.1% and 29.1% of the total abundance, respectively. The key factor identified as driving the structure of the zooplanktonic assemblages was salinity, which showed significant seasonal variation. The results revealed that during the high water period, when the lagoon was filled with fresh water, rotifers were dominant, zooplanktonic diversity was highest, and abundances were quite high. Conversely, during the low water period, when the lagoon was characterized by brackish water, diversity was minimal, and abundance decreased slightly. The study also found that some areas of the lagoon showed high abundances independent of salinity levels, suggesting that other factors such as riverine inputs or the presence of acadjas (home-made brush parks used as fish traps) may also have notable effects on the zooplankton community. Overall, the findings of this study provide valuable insights into the functioning of one of the most biologically productive lagoons in West Africa.

Seasonality

10.3390/jmse11030556

Cite

Citations (7)