Damming reduced the functional richness and caused the shift to a new functional state of the phytoplankton in a subtropical region

Pineda, Alfonso; Iatskiu, Patrícia; Jati, Susicley; Paula, Aline Caroline Magro de; Zanco, Bárbara Furigo; Bonecker, Cláudia Cósta; Moresco, Geovani Arnhold; Ortega, L. A. Castro; Souza, Yasmin Rodrigues de; Rodrigues, Luzia Cleide

doi:10.1007/s10750-020-04311-0

Cited by 23 publications

(13 citation statements)

References 66 publications

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“…Although we did not observe temporal shifts in P concentrations in pooled environments, such changes have been reported for several aquatic environments in the Upper Paraná floodplain [12]. These changes result in a stoichiometric imbalance towards increasing N saturation [36] with consequent changes in ecosystem productivity [15,35,37]. This may lead to a change in the phytoplankton composition [37], and likely change the availability of nutrients to primary producers [38], making them suboptimal resources for primary consumers.…”

Section: Discussionmentioning

confidence: 53%

“…These changes result in a stoichiometric imbalance towards increasing N saturation [36] with consequent changes in ecosystem productivity [15,35,37]. This may lead to a change in the phytoplankton composition [37], and likely change the availability of nutrients to primary producers [38], making them suboptimal resources for primary consumers. Changes in the elemental composition of primary producers can create elemental imbalances between consumers and their resources, with negative consequences for energy transfer among trophic levels, including insects.…”

Section: Discussionmentioning

confidence: 99%

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Pervasive decline of subtropical aquatic insects over 20 years driven by water transparency, non-native fish and stoichiometric imbalance

et al. 2021

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Insect abundance and diversity are declining worldwide. Although recent research found freshwater insect populations to be increasing in some regions, there is a critical lack of data from tropical and subtropical regions. Here, we examine a 20-year monitoring dataset of freshwater insects from a subtropical floodplain comprising a diverse suite of rivers, shallow lakes, channels and backwaters. We found a pervasive decline in abundance of all major insect orders (Odonata, Ephemeroptera, Trichoptera, Megaloptera, Coleoptera, Hemiptera and Diptera) and families, regardless of their functional role or body size. Similarly, Chironomidae species richness decreased over the same time period. The main drivers of this pervasive insect decline were increased concurrent invasions of non-native insectivorous fish, water transparency and changes to water stoichiometry (i.e. N : P ratios) over time. All these drivers represent human impacts caused by reservoir construction. This work sheds light on the importance of long-term studies for a deeper understanding of human-induced impacts on aquatic insects. We highlight that extended anthropogenic impact monitoring and mitigation actions are pivotal in maintaining freshwater ecosystem integrity.

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Section: Discussionmentioning

confidence: 53%

Section: Discussionmentioning

confidence: 99%

Pervasive decline of subtropical aquatic insects over 20 years driven by water transparency, non-native fish and stoichiometric imbalance

et al. 2021

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“…The functional-groups approach assumes that species in a specific group react in the same way to external stimuli and that the differences among groups are greater than the differences among species within a group. This approach has allowed identification of the key temporal and spatial processes underlying the community assemblage (e.g., Rodrigues et al 2018 ; Pineda et al 2020 ), due to the deterministic relationship that can be established between ecological processes and functional traits. For instance, the body size allows identification of the effect of grazing, since smaller phytoplankters (e.g., MBFG I) are more palatable than larger ones (e.g., MBFG VII) (Lehman 1991 ).…”

Section: Methodsmentioning

confidence: 99%

Effects of space and environment on phytoplankton distribution in subtropical reservoirs depend on functional features of the species

2021

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“…Studies on river plankton have shown that beta diversity and its partitions are determined by both environmental and spatial factors, and that hydrological factors influence the dispersion and composition of functions and species (Lopes et al 2014, Gianuca et al 2017, Serafim-Júnior et al 2019. Furthermore, anthropic action (e.g., dams and eutrophication) can alter environmental filters and cause disturbances in aquatic environments, leading to providing functional homogenization in the plankton (Braghin et al 2018, Pineda et al 2020, Simões et al 2020).…”

Section: Introductionmentioning

confidence: 99%

High taxonomic turnover and functional homogenization of rotifer communities in an amazonian river

Gadelha

Dunck

Simões

et al. 2022

An. Acad. Bras. Ciênc.

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Patterns of beta diversity of plankton communities in rivers have been mainly determined by hydrological factors that alter the dispersion and composition of species and traits. Rotifers in the Guamá River (eastern Amazonian River) were sampled (monthly between October 2017 and June 2019) to analyze the temporal variation of taxonomic and functional beta diversity and its partitions (turnover and nestedness) as well as the effects of temporal, environmental, and seasonal dissimilarities. Taxonomic turnover and functional nestedness over time were observed as well as functional homogenization, which was arguably due to the hypereutrophic condition of the river.There were no seasonal differences in taxonomic and functional beta diversity probably due the low environmental dissimilarity. This study demonstrated that this Guamá River stretch presented low environmental dissimilarity and hypereutrophic waters, which benefi ted the establishment of a community of species with high taxonomic turnover over time, but with low functional dissimilarity and loss of some functions related to the functional traits evaluated in the ecosystem. It is important to point out that temporal studies should evaluate both taxonomic and functional aspects of communities, mainly because the effect of environmental changes may be more noticeable at the functional level of communities.

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Damming reduced the functional richness and caused the shift to a new functional state of the phytoplankton in a subtropical region

Cited by 23 publications

References 66 publications

Pervasive decline of subtropical aquatic insects over 20 years driven by water transparency, non-native fish and stoichiometric imbalance

Pervasive decline of subtropical aquatic insects over 20 years driven by water transparency, non-native fish and stoichiometric imbalance

Effects of space and environment on phytoplankton distribution in subtropical reservoirs depend on functional features of the species

High taxonomic turnover and functional homogenization of rotifer communities in an amazonian river

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