Connection promoted by annual floods shaping the response community attributes of shallow lakes fish inhabit the upper Paraná River floodplain

Cruz, Priscilla Ramos; Message, Hugo José; Baumgartner, Matheus Tenório; Gomes, Luiz Carlos

doi:10.1007/s10641-018-0824-1

Cited by 4 publications

(2 citation statements)

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“…flooding, antecedent variability) and beta diversity of riverine fish assemblages (e.g. Benone et al, 2018; Bokhutlo et al, 2021; Cruz et al, 2018). Here, in all beta regression tests done at the reach extent, there was moderate to strong evidence of relationships between hydrological variables (e.g.…”

Section: Discussionmentioning

confidence: 99%

Scale dependency in fish beta diversity–hydrology linkages in lowland rivers

Rolls

Wolfenden

Heino

et al. 2023

Journal of Biogeography

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AimA key aspect of biodiversity research is to determine the environmental drivers affecting the degree to which ecological assemblages vary in space (beta diversity). The strength and significance of environmental drivers of beta diversity is, however, influenced by the spatial extent over which beta diversity is assessed. Beta diversity of riverine biota is affected by flow variability. We examined hydrology–beta diversity relationships at two spatial extents (reaches vs. entire systems) within rivers to determine if relationships with hydrological variables are scale dependent or generalisable across spatial scales.LocationMurray–Darling Basin, Australia.TaxonFreshwater fish.MethodsFish assemblage data were sourced from two monitoring programmes that sampled sites annually during 2014–2019 and spanned either reaches (<100 km) or the broader ‘system’ extent (>1000 km) of five tributaries. Beta diversity was examined by calculating pairwise (incidence and abundance) dissimilarities for each year to compare temporal trends in beta diversity. Multi‐site dissimilarities were modelled against hydrological variables using beta regression.ResultsInter‐annual change in assemblage composition was detected only at the extent of river reaches but not at the extent of river systems. Temporal variation in within‐river beta diversity showed inconsistent patterns when compared between the two spatial extents. Within‐river beta diversity relationships with hydrological gradients were inconsistent among rivers. Overall, statistical models explained much more variation in within‐river beta diversity when assessed at the reach extent when compared to broader river system extents.Main ConclusionsOur findings highlight that changes in within‐river beta diversity are likely to depend on the spatial extent of sampling. Furthermore, inconsistent beta diversity–hydrology relationships among rivers suggest that both empirical evidence and theoretical predictions adopted in ecohydrology may not be transferable among river systems.

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Section: Discussionmentioning

confidence: 99%

Scale dependency in fish beta diversity–hydrology linkages in lowland rivers

Rolls

Wolfenden

Heino

et al. 2023

Journal of Biogeography

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“…With focus on spatial variations of the fish community, the flood effect has been well studied in the literature, with particular emphasis on the flood or dry period (e.g. Cruz, Message, Baumgartner, & Gomes, 2018;Penha, Landeiro, Ortega, & Mateus, 2017). However, as mentioned above for ecological processes, it is notable that a few information exists about the mechanisms taking place in the transition phases.…”

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confidence: 99%

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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