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7. Exploring the Genetic Structure and Phylogeographic Patterns of the Copepod Genus Eurytemora in Europe.

Author

Mouth, Céleste, Ferreira, Flavien, Sukhikh, Natalia, Bou, Elisa, Bernard, Anaëlle, Tackx, Michèle, Azémar, Fréderic, Meire, Patrick, Maris, Tom, and Legal, Luc

Subjects
MAXIMUM likelihood statistics, CYTOCHROME oxidase, GENETIC variation, BIOGEOGRAPHY, PHYLOGENY
Abstract

The genus Eurytemora is a diverse group of copepods found in coastal, estuarine, brackish, and freshwater environments. The main research has focused on Eurytemora affinis (Poppe, 1880) and revealed it to be a species complex. Eurytemora velox (Liljeborg, 1853) has only recently been characterized in the Scheldt estuary but never within a global phylogenetic context. This study integrated nearly all European Eurytemora species sequences available, along with original ones from the Scheldt. A total of 351 sequences were analyzed using one mitochondrial gene (CO1) and one nuclear gene (nITS), with sequencing performed specifically on the CO1 gene. Phylogenetic reconstructions were performed using the Maximum Likelihood method, along with haplowebs and genetic diversity indices. A significant subdivision between six European species was observed. The monophyletic clade status of the E. affinis complex was confirmed alongside the existence of three geographically isolated lineages of the E. affinis species, the East Atlantic, the North Sea/English Channel, and the Baltic lineages, each exhibiting pronounced genetic differentiation. The population of E. velox from the Urals differs significantly from the European ones. These results provide both an overview of the genetic structure of the genus in geographic Europe as well as new insights on E. velox. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Towards more predictive and interdisciplinary climate change ecosystem experiments

Author

Rineau, Francois, Malina, Robert, Beenaerts, Natalie, Arnauts, Natascha, Bardgett, Richard D., Berg, Matty P., Boerema, Annelies, Bruckers, Liesbeth, Clerinx, Jan, Davin, Edouard L., De Boeck, Hans J., De Dobbelaer, Tom, Dondini, Marta, De Laender, Frederik, Ellers, Jacintha, Franken, Oscar, Gilbert, Lucy, Gudmundsson, Lukas, Janssens, Ivan A., Johnson, David, Lizin, Sebastien, Longdoz, Bernard, Meire, Patrick, Meremans, Dominique, Milbau, Ann, Moretti, Michele, Nijs, Ivan, Nobel, Anne, Pop, Iuliu Sorin, Puetz, Thomas, Reyns, Wouter, Roy, Jacques, Schuetz, Jochen, Seneviratne, Sonia I., Smith, Pete, Solmi, Francesca, Staes, Jan, Thiery, Wim, Thijs, Sofie, Vanderkelen, Inne, Van Landuyt, Wouter, Verbruggen, Erik, Witters, Nele, Zscheischler, Jakob, and Vangronsveld, Jaco

Published
2019
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25. Integrating Ecosystem Services into Impact Assessments: A Process-Based Approach Applied to the Belgian Coastal Zone.

Author

Van der Biest, Katrien, Staes, Jan, Prigge, Laura, Schellekens, Tim, Bonte, Dries, D'hondt, Bram, Ysebaert, Tom, Vanagt, Thomas, and Meire, Patrick

Abstract

Policy makers increasingly acknowledge the importance of considering ecosystem services (ESs) and biodiversity in impact assessment (IA) to reduce ecosystem degradation and halt ongoing losses of biodiversity. Recent research demonstrates how ESs can add value to IA, i.e., by shifting the focus from avoiding negative impacts to creating opportunities, by linking effects on ecological functioning to benefits for society, and by providing a multi-disciplinary framework that allows to consider cross-sectoral effects. However, challenges exist to its implementation in practice. The most commonly used ES models do not consider interactions among ESs. This restricts their capacity to account for cross-sectoral effects. Integrating ESs into IA also increases time investments as they cover a wide variety of disciplines and need detailed information. This paper presents a pragmatic approach that tackles these challenges and may facilitate the inclusion of ESs into IA. The approach focuses on ecosystem processes as the driver of ESs and biodiversity and the basis to evaluate effects of a project. Using the Belgian coastal ecosystem, we illustrate how the approach restricts data needs by identifying the priority ESs, how it improves the coverage of cross-sectoral effects in IA, and how it contributes to a more objective selection of impacts. [ABSTRACT FROM AUTHOR]

Published
2023
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32. Long-term phytoplankton dynamics in the Zeeschelde estuary (Belgium) are driven by the interactive effects of de-eutrophication, altered hydrodynam- ics and extreme weather events

Author

Amadei Martínez, Luz, Sabbe, Koen, Dasseville, Renaat, Daveloose, Ilse, Verstraete, Tine, D'hondt, Sofie, Azemar, Frederic, Sossou, Akoko Claudine, Tackx, Micky, Maris, Tom, Meire, Patrick, and Vyverman, Wim

Subjects
Turbid estuary, Environmental Engineering, Monitoring, NETHERLANDS, Schelde, EURYTEMORA-AFFINIS, Diatom, BLOOM, Cyanobacteria, SCHELDT ESTUARY, Pollution, COMMUNITY, Chemistry, WATER-QUALITY, ZOOPLANKTON, RIVER, Environmental Chemistry, Green algae, ASSEMBLAGES, COASTAL WATERS, Waste Management and Disposal, Biology
Abstract

We studied how changing human impacts affected phytoplankton dynamics in the freshwater and brackish tidal reaches of the Zeeschelde estuary (Belgium) between 2002 and 2018. Until the early 2000s, the Zeeschelde was heavily polluted due to high wastewater discharges. By 2008, water quality had improved, resulting in lower nutrient concentrations and higher oxygen levels. Since 2009, however, increased dredging activities resulted in altered hydro-dynamics and increased suspended sediment concentration. The combined effects of these environmental changes were reflected in three marked transitions in phytoplankton community composition. Assemblages were dominated by Thalassiosirales and green algae (especially Scenedesmaceae) until 2003. The period 2003-2011 was characterized by the wax and wane of the centric diatoms Actinocyclus and Aulacoseira, while in the period 2012-2018 Thalassiosirales and Cyanobacteria became dominant, the latter mainly imported from the tributaries. Phytoplankton biomass increased sharply in 2003, after which there was a gradual decline until 2018. By 2018, the timing of the growing season had advanced with about one month compared to the start of the study, probably as a consequence of climate warming and intensified zooplankton grazing pressure. Our study shows that de-eutrophication (during the 2000s) and morphological interventions in the estuary (in the 2010s) were dominant drivers of phytoplankton dy-namics but that the main shifts in community composition were triggered by extreme weather events, suggesting sig-nificant resistance of autochthonous communities to gradual changes in the environment.

Published
2023

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