Spatio-temporal organization patterns in the fish assemblages of a Neotropical floodplain

Ortega, Jean C. G.; Dias, Rosa Maria; Petry, Ana Cristina; Oliveira, Edson Fontes de; Agostinho, Ângelo Antônio

doi:10.1007/s10750-014-2089-9

Cited by 28 publications

(32 citation statements)

References 38 publications

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“…As with the limnological variables, these differences were accentuated during the rainy season. These results are consistent with similar findings that demonstrated alterations in the structure and composition of ichthyofauna in a longitudinal gradient, with species turnover along the studied environments, according to observed environmental variation (Araújo et al, ; Araújo, Pinto, & Teixeira, ; Britto & Carvalho, ; Carvalho et al, ; Oliveira et al, ; Ortega et al, ; Queiroz et al, ; Terra et al, ). Most of the variation in the longitudinal gradient is due to the species evolution of Neotropical fish, which were almost entirely modulated in riverine habitats because the only lentic habitats that previously existed were marginal lagoons (Tedesco et al, ).…”

Section: Discussionsupporting

confidence: 92%

“…The effects of compartmentalisation and seasonality have been widely studied in isolation in large dammed rivers, as Paraná and Tocantins Rivers Araújo et al, 2013;Ortega, Dias, Petry, Oliveira, & Agostinho, 2015), which presents hundred metres of width, hundred kilometres in length and several large tributaries on its course, that presents large dams. However, few studies have investigated damming effects of habitat compartmentalisation in concert with seasonality in smaller tributaries (Baumgartner, Baumgartner, & Gomes, 2017) Therefore, we tested the hypothesis that longitudinal gradient and seasonality act simultaneously as modulators of fish community structure of a small tributary under influence of a large damming (high retention time).…”

Section: Introductionmentioning

confidence: 99%

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Damming and seasonality as modulators of fish community structure in a small tributary

Nobile

Freitas‐Souza

Lima

et al. 2019

Ecology of Freshwater Fish

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River damming alters the physical–chemical variables of water and often causes compartmentalisation of aquatic habitats. Seasonality can add complexity to the longitudinal compartmentalisation. The spatial and temporal effects of these two phenomena on the structure of ichthyofauna from a tributary under the influence of damming were evaluated, based on the following hypotheses: (1) transition habitats have the greatest species richness; (2) community similarity decreases with increasing distance between sites; (3) conservation of free‐flowing areas upstream reservoir contributes to the maintenance of migratory species. To evaluate the effects of these two phenomena, twelve monthly fish samples (September/12 to August/13) were performed with gillnets in three sample areas distributed longitudinally in the tributary. Limnological variables were measured in the same sample areas to confirm compartmentalisation. We observed three distinct limnological compartments (lotic, transition and lentic), with increase differentiation during the rainy season. This compartmentalisation influenced fish fauna where localised communities exhibited different compositions among the three sampled habitats. During the rainy season, these differences become pronounced, with transition habitat showing greater species richness than the others. More pronounced differences in species composition and structure in extremes sampling sites were also observed. Migratory fish presented higher proportion of fish composition in lotic habitat. In conclusion, damming and seasonality acted concomitantly as modulators of fish fauna in a tributary influenced by damming. However, compartmentalisation of habitats was the primary driver of ichthyofauna community structure with the rainy season increasing differences in community composition.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Damming and seasonality as modulators of fish community structure in a small tributary

Nobile

Freitas‐Souza

Lima

et al. 2019

Ecology of Freshwater Fish

View full text Add to dashboard Cite

show abstract

“…() and later studies (Barberan et al ., ; Ju et al ., ), we showed that microorganisms tend to co‐occur less than expected by chance (i.e., they display species segregation) in an anthropogenic‐impacted river. The high water flow during wet or flood periods could have resulted in increasing the mass effect and homogenization of environmental conditions, resulting in decreasing strength of species segregation, whereas opposite trends may appear during low water flow in the dry season (Ortega et al ., ). However, our results based on C ‐score and C var ‐score analysis offer an alternative hypothesis.…”

Section: Discussionmentioning

confidence: 97%

Strong impact of anthropogenic contamination on the co‐occurrence patterns of a riverine microbial community

Hou

et al. 2017

Environmental Microbiology

214

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Although the health of rivers is threatened by multiple anthropogenic stressors with increasing frequency, it remains an open question how riverine microbial communities respond to emerging micropollutants. Here, by using 16S rDNA amplicon sequencing of 60 water samples collected during different hydrological seasons, we investigated the spatio-temporal variation and the co-occurrence patterns of microbial communities in the anthropogenically impacted Jiulong River in China. The results indicated that the riverine microbial co-occurrence network had a nonrandom, modular structure, which was mainly shaped by the taxonomic relatedness of co-occurring species. Fecal indicator bacteria may survive for prolonged periods of time in river water, but they formed an independent module which had fewer interactions with typical freshwater bacteria. Multivariate analysis demonstrated that nutrients and micropollutants [i.e., pharmaceuticals and personal care products (PPCPs)] exerted combined effects in shaping α- and β-diversity of riverine microbial communities. Remarkably, we showed that a hitherto unrecognized disruptive effect of PPCPs on the abundance variations of central species and module communities was stronger than the influence of physicochemical factors, suggesting the key role played by micropollutants for the microbial co-occurrence relationships in lotic ecosystems. Overall, our findings provide novel insights into community assembly in aquatic environments experiencing anthropogenic stresses.

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“…Systems that are under a constant environment stress have been the focus of diverse studies on the assembly rules of fish communities. Ortega, Dias, Petry, Oliveira, and Agostinho (2015) searched for spatio-temporal patterns of fish communities in a floodplain river. Ortega, Dias, Petry, Oliveira, and Agostinho (2015) searched for spatio-temporal patterns of fish communities in a floodplain river.…”

Section: Introductionmentioning

confidence: 99%

The role of environmental filtering in the functional structure of fish communities in tropical wetlands

Córdova-Tapia

Hernández-Marroquín

Zambrano

2017

Ecology of Freshwater Fish

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Understanding the mechanisms that structure communities has been a major challenge in ecological theory. In wetlands with a clear seasonal hydroperiod (wet and dry seasons), such as Sian Ka'an Biosphere Reserve (SKBR), Mexico, fish communities experience successive habitat contraction/expansion, with a high mortality rate during the dry season. In this study, we tested the role of environmental filtering in structuring fish communities along an environmental gradient in permanent pools, during three consecutive stages of the dry season. We analysed fish communities using a functional dispersion index weighted by the relative abundance compared against a null model. While the concentration of dissolved oxygen remained low throughout the

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Spatio-temporal organization patterns in the fish assemblages of a Neotropical floodplain

Cited by 28 publications

References 38 publications

Damming and seasonality as modulators of fish community structure in a small tributary

Damming and seasonality as modulators of fish community structure in a small tributary

Strong impact of anthropogenic contamination on the co‐occurrence patterns of a riverine microbial community

The role of environmental filtering in the functional structure of fish communities in tropical wetlands

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