Extreme drought events can promote homogenization of benthic macroinvertebrate assemblages in a floodplain pond in Brazil

Bertoncin, Ana Paula dos Santos; Pinha, Gisele Daiane; Baumgartner, Matheus Tenório; Mormul, Roger Paulo

doi:10.1007/s10750-018-3756-z

Cited by 34 publications

(18 citation statements)

References 76 publications

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“…This aligns with findings of Bertoncin et al. (2019), which indicate that unusually prolonged droughts of ponds in Brazil reduced their resilience to other environmental stressors. Exploring whether the recent drying in RD networks alters their resilience to other stressors, such as contaminants, hydromorphological alterations, or biological invasions would deserve further research.…”

Section: Discussionsupporting

confidence: 92%

“…The theory predicts community composition to be stable over time in frequently disturbed environment as organisms are supposed to possess resistant and resilience traits (Chase, 2007). This is because resistant taxa promote rapid initial community recovery following disturbances while resilient taxa quickly contribute to ecological succession following this initial recovery, which results in high similarity of community composition over time (Bertoncin et al., 2019; Chase, 2007; Vander et al, 2016). Accordingly, we found that intermittent sites in RD networks had a higher turnover of taxa over time compared to perennial sites, while no difference of turnover between intermittent and perennial sites was observed in HD networks.…”

Section: Discussionmentioning

confidence: 99%

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Drying in newly intermittent rivers leads to higher variability of invertebrate communities

et al. 2020

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Aquatic invertebrate communities inhabiting intermittent rivers that are characterised by recurrent drying events (flow cessation or complete disappearance of surface water) often show rapid recovery upon flow resumption. Such rapid recovery is possible thanks to specific resistance and resilience traits that species adapted to river drying often exhibit. However, differences in community response to drying can be expected between historically drying (HD) networks—those IRs with a long history of flow intermittence—and recently drying (RD) networks, where drying is a novel, often human‐induced, phenomenon. The invertebrate species found in RD networks may lack the adaptations that are known to facilitate quick community recovery upon rewetting and could thus be dramatically affected by drying. Unfortunately, the responses of aquatic communities in RD networks are still poorly explored, limiting our capacity to predict and mitigate future biodiversity changes. Here, we compared the responses of aquatic invertebrate communities to drying in nine pairs of intermittent and perennial river reaches from HD networks across France and nine pairs from RD networks across the Czech Republic. Using both taxonomic and functional perspectives, differences in α‐ and β‐diversity patterns between perennial and intermittent sites were evaluated separately for HD and RD groups, and before and after drying over several years. Drying had stronger effects on taxonomic richness in RD compared to HD networks. In addition, drying greatly altered spatial and temporal β‐diversity in RD networks, but it marginally affected β‐diversity in HD networks. Communities of HD networks showed a higher proportion of resistant taxa than RD networks. These results suggest that recent drying can have, at least on a short time scale (i.e. years), stronger effects on aquatic communities in RD networks compared to those in HD networks. Because drying duration, frequency, and spatial extent are increasing with climate change, RD networks could soon reach tipping points, calling for long‐term monitoring of biodiversity in these novel ecosystems.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Drying in newly intermittent rivers leads to higher variability of invertebrate communities

et al. 2020

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“…These results are in line with the suggestions and findings of several authors (Amoros & Bornette, 2002;dos Santos Bertoncin, Pinha, Baumgartner, & Mormul, 2019;Henry et al, 2011;Mayora, Devercelli, & Giri, 2013), meaning that the homogenizing effect of the flood pulse is not a general rule and must be adjusted to the kind of situation, aquatic organism and river. For example, while zooplankton beta diversity and environmental heterogeneity decrease during flooding (Bozelli, 1992;Bozelli, Thomaz, Padial, Lopes, & Bini, 2015), fish dispersal is likely to increases and fish assemblage homogenization may occurs later, during low water phases.…”

Section: )supporting

confidence: 91%

Discrimination of hydrologic variations for spatial distribution of fish assemblage in a large subtropical temperate river

et al. 2019

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This study examines the effects of the flow and flood pulses on spatial dispersion of fish assemblages in the floodplain of the Paraná River in Argentina. We tested the hypothesis that high water levels and greater lateral connectivity promote fish dispersal and spatial homogenization of assemblage structure. We sampled four sites during different phases of the annual hydrologic cycle from 2010 to 2016. Water surface in the area was estimated during each phase. We computed multivariate statistics and estimates of ß‐diversity to analyse assemblage variations in relation to hydrological phases. Three hydrological phases were defined: low flow pulses (water levels between 2.3 and 3.2, approximately 10% of the floodplain covered by water), high flow pulses (between 3.2 and 4.5, from 11 to 84%), and floods (> 4.5 m, more than 84%). Although difference between high flow pulses and flood was not significant, ß‐diversity values for these stages were higher than for low flow pulses. This suggests that floods and high flow pulses increase the spatial variability of fish assemblages, whereas homogenization processes occur later during low flow periods. This work provides further knowledge about the flood homogenization effect in a large unregulated floodplain where lateral connectivity still plays a significant role on ecological structuring processes.

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“…Castaño-Sánchez et al, 2018;Richardson et al, 2018) and macroinvertebrates (e.g. Cook et al, 2018;Zhang et al, 2018b;dos Bertoncin et al, 2019), while other organism groups, such as macrophytes, have received less attention. Studies focusing on the biotic homogenisation of aquatic macrophyte communities have found contradicting results, showing either biotic homogenisation or differentiation (e.g.…”

Section: Trait Variation Within a Speciesmentioning

confidence: 99%

Changes in the functional features of macrophyte communities and driving factors across a 70-year period

et al. 2020

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Functional homogenisation occurs across many areas and organism groups, thereby seriously affecting biodiversity loss and ecosystem functioning. In this study, we examined how functional features of aquatic macrophytes have changed during a 70-year period at community and species levels in a boreal lake district. At the community level, we examined if aquatic macrophyte communities showed different spatial patterns in functional composition and functional richness in relation to main environmental drivers between the time periods. We also observed each species in functional space to assess if species with certain sets of traits have become more common or rare in the 70-year study period. We found changes in the relationship between functional community composition and the environment. The aquatic macrophyte communities showed different patterns in functional composition between the two time periods, and the main environmental drivers for these changes were partly different. Temporal changes in functional richness were only partially linked to concomitant changes in the environment, while stable factors were more important. Species' functional traits were not associated with commonness or rarity patterns. Our findings revealed that functional homogenisation has not occurred across these boreal lakes, ranging from small oligotrophic forest lakes to larger lakes affected by human impacts.

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Extreme drought events can promote homogenization of benthic macroinvertebrate assemblages in a floodplain pond in Brazil

Cited by 34 publications

References 76 publications

Drying in newly intermittent rivers leads to higher variability of invertebrate communities

Drying in newly intermittent rivers leads to higher variability of invertebrate communities

Discrimination of hydrologic variations for spatial distribution of fish assemblage in a large subtropical temperate river

Changes in the functional features of macrophyte communities and driving factors across a 70-year period

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