Horizontal distribution of rotifers in a subtropical shallow lake (Paraná floodplain, Argentina)

Paggi, Susana B. José de; Muñoz, Sandra; Frau, Diego; Paggi, Juan C.; Scarabotti, Pablo Augusto; Devercelli, Melina; Meerhoff, Mariana

doi:10.1127/1863-9135/2012/0245

Cited by 17 publications

(5 citation statements)

References 31 publications

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“…Thus, we cannot discard the possibility that the reduced separation between macrophyte beds and open water probably led to a more active replacement of species and allowed for a great number of non-planktonic species in the water column throughout our sampling period. A similar situation has been observed in other shallow subtropical lakes on the Paraná River floodplain (José de Paggi, 1993;José de Paggi et al, 2012), where Panicum elephantipes, Cyperus alternifolius, Thypa sp., and Paspalum repens were the dominant macrophytes and they supported the diversity of nonplanktonic organisms in the open water regions of these lakes.…”

Section: Discussionsupporting

confidence: 82%

Does artificial drawdown affect zooplankton structure in shallow lakes? A short-term study in a tropical reservoir

Portinho

Nogueira

2017

Hydrobiologia

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Water level fluctuation by artificial drawdown is one management activity that has the potential to control macrophyte growth, but there is little knowledge of how this operational procedure affects other biotic components of the ecosystem. This study investigated zooplankton dynamics in response to artificial drawdown over a short timeframe (13 days) in a Brazilian reservoir, by examining the impact on zooplankton communities in two shallow lakes (Lake Pedra Branca-LPB, and Guaritá-LG) connected to a reservoir (Salto Grande) that undergo sudden and remarkable fluctuations in their water levels. Zooplankton communities were sampled in both lakes before (pre-drawdown), during (low water), and after (post-drawdown) the artificial drawdown procedure. In LPB, drawdown resulted in an increase in zooplankton density, and temporarily changed the community in association with an increase in water conductivity and presence of non-planktonic organisms during the low water phase. In LG, drawdown had no significant effect on zooplankton community between the phases before and during the drawdown event. The results from this study suggest that artificial drawdown over a short timeframe in reservoir systems do not negatively affect the overall density, richness, and diversity of zooplankton communities in marginal shallow lakes.

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Section: Discussionsupporting

confidence: 82%

Does artificial drawdown affect zooplankton structure in shallow lakes? A short-term study in a tropical reservoir

Portinho

Nogueira

2017

Hydrobiologia

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“…The finest between‐habitats scale comprised very distinct habitats, including open water areas and vegetated patches with distinct macrophyte life forms that were expected to provide differential niches regarding environmental conditions, refuge area and food availability (Ferreiro, Giorgi, & Feijoo, ; Thomaz & Ribeiro Da Cunha, ; Warfe & Barmuta, ). A shift from primarily epiphytic and littoral species in macrophyte stands to pelagic phyto‐ and zooplankton taxa in open waters was reported in previous studies (Avigliano, Vinocur, Chaparro, Tell, & Allende, ; Chaparro, Kandus, & O'Farrell, ; Duggan, Green, Thompson, & Shiel, ; José de Paggi et al., ). At the same time, these habitats are well connected and comprise one waterbody (section).…”

Section: Discussionsupporting

confidence: 72%

Plankton metacommunities in floodplain wetlands under contrasting hydrological conditions

et al. 2018

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Species diversity is affected by processes operating at multiple spatial scales, although the most relevant scales that contribute to compositional variation and the temporal shifts of the involved mechanisms remain poorly explored. We studied spatial patterns of phytoplankton, rotifers and microcrustacean diversity across scales in a river floodplain system of the Danube in Austria under contrasting hydrological conditions (post‐flood versus low water level).The species turnover between water sections (β2) and between wetlands (β3) was the major components of regional diversity for all studied groups, with species turnover between habitats (β1) as a minor contributor. β1 diversity and β2 diversity were lower than expected by chance in most cases, suggesting that communities are more homogeneous than expected at these scales. β3 diversity was higher than expected by chance in many cases, indicating more distinct communities at the wetland level. Patterns were highly similar under different hydrological conditions, indicating no major immediate effect of flood events.Local environmental and spatial factors were similarly important in structuring phytoplankton, rotifer and microcrustacean communities in both hydrological conditions. Relevant environmental factors were spatially structured in post‐flood conditions especially between sections, suggesting flood‐driven homogenisation within the wetlands. Under low water level, spatial structuring of environment decreased and pure environmental factors gained relevance for phytoplankton and rotifers.Our results suggest that although β2 diversity between water sections is a major component of regional diversity, long‐term spatial processes responding to connectivity across the wetland structure phytoplankton, rotifer and microcrustacean communities. Aquatic sections within the limited spatial extent of the remaining floodplain areas appear more homogeneous than expected probably due to flood recurrence over the years.These results highlight that adequate planning of restoration and conservation strategies of floodplain wetlands should consider environmental heterogeneity together with long‐term spatial processes.

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“…The influence of the hydrological regime on the composition and structure of rotifers assemblages, as well as other zooplankton groups, has also been observed in other floodplains environments (e.g. Lansac-Tôha et al 1992, Bonecker et al 2009, Paggi and José de Paggi 1990, José de Paggi et al 2012, Koste and Robertson 1983, Bozelli 1992, Saunders III and Lewis Jr 1989. Lansac-Tôha et al (2009) argued that the increase of habitat connectivity shaped rotifers communities as an indirect effect of seasonality, and Keppeler and Hardy (2004) found correlations between eletrical conductivity and rotifers abundance, as did we.…”

Section: Biotic and Environmental Integrationmentioning

confidence: 69%

The effect of seasonality on the structure of rotifers in a black-water shallow lake in Central Amazonia

Nova

Lopes

Souza

et al. 2014

An. Acad. Bras. Ciênc.

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Rotifers have often been used as indicators of sudden changes in physical and chemical features of the aquatic environment. Such features vary greatly during flood pulse events in small lakes connected to major floodplains. However, few are the studies that investigate the consequences of the flood pulse in rotifer species composition, abundance, richness and diversity, especially in Amazonian lakes. We analyzed samples from a small blackwater lake of an "igarapé" connected permanently to the Negro river, in Central Amazonia. Samples were taken twice a year for two years, comprising flooding and receding periods of the flood pulse. Rotifer abundance increased significantly after draught events, and electrical conductivity and turbidity were intrinsically related to such variation. Species composition also changed from flooding to receding periods. Some taxa, such as Brachionus zahniseri reductus and Lecane remanei were restricted to receding periods, while Brachionus zahniseri, Brachionus gillardi and Lecane proiecta were only present during flooding. A shift in the composition of rotifer families was observed from one period to another, showing the effect of renewing waters of the flood pulse. These results suggest that the flood pulse acts as a driving force and stressing condition, considerably altering rotifer community dynamics, either changing species composition or decreasing abundance.

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Horizontal distribution of rotifers in a subtropical shallow lake (Paraná floodplain, Argentina)

Cited by 17 publications

References 31 publications

Does artificial drawdown affect zooplankton structure in shallow lakes? A short-term study in a tropical reservoir

Does artificial drawdown affect zooplankton structure in shallow lakes? A short-term study in a tropical reservoir

Plankton metacommunities in floodplain wetlands under contrasting hydrological conditions

The effect of seasonality on the structure of rotifers in a black-water shallow lake in Central Amazonia

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