Using morphofunctional characteristics as a model of phytoplankton dynamics in a tropical reservoir

Trindade, Ricardina Maria Lemos; Santos, Sílvia; Souza, Cláudia Alves de; Santos, Carlos Roberto Alves dos; Bortolini, Jascieli Carla

doi:10.1007/s40415-021-00705-z

Cited by 5 publications

(3 citation statements)

References 41 publications

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“…Species belonging to MBFG VI have a siliceous exoskeleton; they lack flagella and have low light requirements, which favor these organisms in turbulent lakes with low light availability (Izaguirre et al, 2012;Kruk et al, 2010;Trindade et al, 2021). In our study, however, this group (mainly small centrales) thrived in a low trophic status environment and a relatively deep Z eu (i.e., ≥ 4 m) was the environmental threshold for MBFG VI dominance.…”

Section: Discussioncontrasting

confidence: 50%

The influence of trophic status and seasonal environmental variability on morpho-functional traits in tropical man-made shallow lakes

Vanderley

Becker

Panosso

et al. 2022

Environ Monit Assess

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In the tropics, seasons are delimitated by the extent of rainfall resulting in seasonal differences in water parameters shaping phytoplankton community dynamics. Dry periods can intensify eutrophication and often result in seasonal or even perennial cyanobacterial dominance. This study was developed to evaluate phytoplankton response to trophic state and seasonal differences of environmental filters (dry and rainy periods) using the morphology-based functional groups (MBFG) approach. We also aimed at identifying environmental thresholds of each MBFG dominance in six man-made lakes located in the tropical semiarid region of Brazil. Our results showed clear MBFG association with lakes’ trophic states. The dominant groups in mesotrophic conditions were members of MBFGs V (unicellular flagellates) and VI (non-flagellated with a siliceous exoskeleton), and in meso-eutrophic MBFG IV (medium size without specialized traits) dominated. Conversely, MBFG VII (with mucilage and aerotopes) and VIII (nitrogen-fixing cyanobacteria) dominated mostly under eutrophic conditions, though linked to shallower euphotic zones. Light and phosphorous were the most important environmental thresholds associated with MBFG’s dominance. Overall, most of the lakes displayed seasonal differences in environmental filters. In contrast to what was expected, the rainy season was associated with higher nutrients, suspended solids, and reduced euphotic depth compared to the dry season. Our results, overall, show that the effects of seasonality varied across lakes and highlight eutrophication as the main environmental factor for MBFG selection suggesting reduced seasonality effects during dry years in the tropics.

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Section: Discussioncontrasting

confidence: 50%

The influence of trophic status and seasonal environmental variability on morpho-functional traits in tropical man-made shallow lakes

Vanderley

Becker

Panosso

et al. 2022

Environ Monit Assess

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“…Relating the community to the environmental conditions of the rivers, the taxonomic approach proved to be more sensitive than the MBFGs. MBFGs have been applied in different studies, and their responses to environmental variability have also been satisfactory (Bohnenberger et al, 2018;Cupertino et al, 2019;Yang et al, 2020;Trindade et al, 2021). However, in our study, MBFGs were not related to the environmental variability of rivers.…”

Section: Discussionmentioning

confidence: 47%

Taxonomic and morphofunctional phytoplankton response to environmental variability in rivers from different hydrographic basins in Southern Brazil

et al. 2022

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Aim Urbanization, agriculture, and deforestation are the main anthropogenic factors that modify the soil, altering the quality of water, and influencing limnological aspects and the aquatic biota in rivers. We investigated the morphology-based taxonomic and functional response (MBFG) of the phytoplankton community among different public supply rivers in distinct hydrographic basins with ultraoligotrophic, oligotrophic, and mesotrophic characteristics. Methods We sampled the phytoplankton community and environmental variables in nine rivers along three hydrographic basins in western Paraná. In order to evaluate the taxonomic and functional relationship of the community with the environmental variables, we applied both variance and redundancy analyses. Results Differences in temperature, pH, turbidity, total phosphorus, chemical oxygen demand, and total dissolved solids were identified among river basins and/or trophic states. The highest taxonomic contributions to richness and biovolume were from green algae and diatoms, while the highest functional contributions were from MBFG IV (algae without specialized traits), MBFG V (unicellular flagellated algae), MBFG VI (algae with a siliceous exoskeleton) and MBFG (large colonial algae). The taxonomic approach was sensitive to environmental variability in the rivers, while for the functional approach no relationship to environmental variability was identified. Conclusions The taxonomic approach of the phytoplankton community was more sensitive to the environmental variability of the studied rivers than the functional approach based on morphology. Therefore, we reinforce the importance of biological indicators for understanding the dynamics in aquatic ecosystems, providing crucial information for the management of water resources used for public supply.

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“…Phytoplankton are a low-order component of aquatic communities with an abundance of species and individuals. The structure and composition of the phytoplankton community alter in response to changes in hydrologic conditions [39,40]. In the current investigation, phytoplankton communities collected from 21 sampling sites with different hydrological conditions were divided into three groups via cluster analysis, namely Reservoir Wetlands Group, Flowreduced Wetlands Group and Natural Wetlands Group.…”

Section: Discussionmentioning

confidence: 98%

Responses of Phytoplankton Communities to Flow Regulation in Northeastern Riverine Wetlands of China

Meng,

2023

Diversity

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Among the impacts of dam construction on river ecosystem, runoff regulation and habitat fragmentation are the two major concerns. Herein, the response characteristics of phytoplankton communities to reservoir impoundment and dam interception were explored by taking Manjiang and Songjiang rivers, where a man-made engineering project was constructed, and the natural stretches located in the up-streams as the research objects. The results obtained revealed that the compositions of phytoplankton communities, collected from the 21 sampling sites in the riverine wetlands of reservoir stretch, flow-reduced stretch, and natural stretch, were dissimilar. The communities of phytoplankton were clustered into three groups. The co-occurrence network analysis indicated that the interspecific relationship structures of phytoplankton communities of each group were different. The indicator species Chlamydomonas ovalis, Synedra acus, and Chlamydomonas globosa, belonged to the Reservoir Wetlands Group, Diatoma vulgare, Fragilaria ca pucina, and Meridion circulare belonged to the Flow-reduced Wetlands Group, and Ceratoneis arcus and Treubaria crassispina belonged to the Natural Wetlands Group. The functional group L0 was the absolute dominant group in all three groups of the riverine wetlands, but a discrepancy was that the proportions of functional group X2 and functional group C in the Reservoir Wetlands Group were remarkably higher, while the proportion of functional group MP in the Flow-reduced Wetlands Group was noticeably higher. By assessing the status of the phytoplankton community composition and the functional group structure, we concluded that current velocity and water depth were crucial influencing factors, and the functional group structure based on the classification of livable water could be applied as a good indication for demonstrating phytoplankton community succession.

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Using morphofunctional characteristics as a model of phytoplankton dynamics in a tropical reservoir

Cited by 5 publications

References 41 publications

The influence of trophic status and seasonal environmental variability on morpho-functional traits in tropical man-made shallow lakes

The influence of trophic status and seasonal environmental variability on morpho-functional traits in tropical man-made shallow lakes

Taxonomic and morphofunctional phytoplankton response to environmental variability in rivers from different hydrographic basins in Southern Brazil

Responses of Phytoplankton Communities to Flow Regulation in Northeastern Riverine Wetlands of China

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