Environmental heterogeneity drives the distribution of copepods (Crustacea: Copepoda) in the Amazon, Araguaia, Pantanal, and Upper Paraná floodplains

Amaral, Diogo Castanho; Bomfim, Francieli de Fátima; Lansac‐Tôha, Fábio Amodêo

doi:10.1590/0001-3765202220191260

Cited by 3 publications

(1 citation statement)

References 54 publications

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“…A greater distance between sites induced higher total beta diversity and species turnover, which is expected when analyzing beta diversity (Peláez & Pavanelli, 2019;Amaral et al, 2022). This is because large spatial gradients lead to great environmental heterogeneity, i.e., great variation in local characteristics and consequently a great availability of different niches (Stein et al, 2014; Heino et al, 2015), which reflect in a higher occurrence of species and differences in composition among sites (Stein et al, 2014), as observed.…”

Section: Discussionmentioning

confidence: 56%

Factors associated with macrophyte beta diversity in Caxiuanã Bay, located in the Eastern Amazon

Vieira,

Bomfim,

Brito

et al. 2023

Acta Limnol. Bras.

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Aim In this study, we investigated the beta diversity of macrophytes (total, turnover, and nestedness) in Caxiuanã Bay, localized in the Eastern Amazon. We also investigated the environmental factors determining the beta diversity and its components. Methods Macrophytes and physical-chemical variables (pH, water temperature, electrical conductivity, dissolved oxygen, and water turbidity) were sampled in 45 sites in 2017. Beta diversity was calculated based on Jaccard dissimilarity (using a presence/absence matrix) and partitioned in turnover and nestedness. We performed a Generalized Dissimilarity Modeling to analyze the influence of local (physical-chemical) and spatial factors (geographic distance) on total beta diversity and its components. Results A total of 16 macrophyte species were identified belonging to five morphological groups (free-floating, emergent, submerged, epiphytes, and rooted with floating leaves). The total beta diversity of macrophytes was 0.29, the turnover component had the highest contribution to total beta compared to nestedness. The beta total was influenced by geographic distance and conductivity, turnover by geographic distance and turbidity, and nestedness was explained by conductivity and pH. Conclusions In our study, physical-chemical factors influenced the structure of the macrophyte community, indicating that niche processes (deterministic) were acting and changing species composition. However, the spatial component and the low explanatory power of the models, especially for turnover, can also indicate the influence of stochastic processes such as ecological drift and/or limitations in dispersal. Our study provides new insights into the diversity patterns of macrophytes in Amazonian ecosystems, particularly in blackwater rivers. Our data also contribute to a better understanding of the processes that structure the species composition of macrophytes in these environments.

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Section: Discussionmentioning

confidence: 56%

Factors associated with macrophyte beta diversity in Caxiuanã Bay, located in the Eastern Amazon

Vieira,

Bomfim,

Brito

et al. 2023

Acta Limnol. Bras.

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What do we know about zooplankton occurrence and distribution in Neotropical streams? A systematic review of published studies in Brazil

Bomfim,

Bonecker,

Lansac-Tôha

et al. 2024

Hydrobiologia

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Upstream cascade reservoirs drive temporal beta diversity increases through species loss in a dammed river

Guimarães Durán,

Lansac-Tôha,

Meira

et al. 2024

FEMS Microbiology Ecology

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Changes in biodiversity of aquatic environments over time and space due to human activities are a topic of theoretical and conservational interest in ecology. Thus, variation in taxonomic beta diversity of planktonic ciliates community was investigated along a temporal and spatial gradient in two subsystems of a Neotropical floodplain, one impacted by dams (Paraná) and the other free of them along its course (Ivinhema). For the spatial analysis, Paraná subsystem did not show a significant decrease in beta diversity, presenting a pattern like that observed for Ivinhema subsystem. Therefore, biotic homogenization was not observed for the ciliate's community downstream of the dams. It was noted a fluctuation in the relevance of the components of beta diversity regardless of the subsystem analyzed. For the temporal analysis there was a significant change in species composition from the first to the last year investigated, essentially for the subsystem impacted by dams and this was determined mainly by species loss. Although spatial beta diversity remained high without a clear process of biotic homogenization, dams promoted remarkable changes in ciliate species composition over the years mainly by continuous loss of species.

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Environmental heterogeneity drives the distribution of copepods (Crustacea: Copepoda) in the Amazon, Araguaia, Pantanal, and Upper Paraná floodplains

Cited by 3 publications

References 54 publications

Factors associated with macrophyte beta diversity in Caxiuanã Bay, located in the Eastern Amazon

Factors associated with macrophyte beta diversity in Caxiuanã Bay, located in the Eastern Amazon

What do we know about zooplankton occurrence and distribution in Neotropical streams? A systematic review of published studies in Brazil

Upstream cascade reservoirs drive temporal beta diversity increases through species loss in a dammed river

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