Unravelling the role of determinism and stochasticity in structuring the phytoplanktonic metacommunity of the Paraná River floodplain

Devercelli, Melina; Scarabotti, Pablo Augusto; Mayora, Gisela; Schneider, Berenice; Giri, Federico

doi:10.1007/s10750-015-2363-5

Cited by 54 publications

(54 citation statements)

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“…In accordance with the high values of TN and TP in water reported in both lakes, concentration of N-NO 3 − + N-NO 2 − and N-NH 4 + in water in Lake 1 were higher than those reported to isolated lakes of the Paraná River system (from undetectable to 100 μg.l −1 , Pedrozo et al 1992;Bonetto et al 1994;Villar et al 1998;Unrein 2002;Maine et al 2004;Devercelli et al 2015). In contrast, in Lake 2, mean values of N-NO 3 − + N-NO 2 − and N-NH 4 + in water were low in comparison with those values expected for eutrophic and hypereutrophic lakes (Quirós 2003).…”

Section: Discussionsupporting

confidence: 81%

“…Taking into account TP and TN levels, both lakes would be classified as eutrophic following the criteria for tropical and subtropical lakes (OECD 1982;Salas and Martino 1991;Huszar et al 1998). Indeed, when cattle were present, TP, TN and SRP concentration in Lake 1 were between two and three times higher than those reported in other studies of wetlands of the Paraná river system (Pedrozo et al 1992;Bonetto et al 1994;Villar and Bonetto 2000;Unrein 2002;Maine et al 2004;Devercelli et al 2015). Pedrozo et al (1992) found that values of TP ranged from 100 to 150 μg.l −1 , and values of SRP were lower than 50 μg.l −1 in a study of two lakes.…”

Section: Discussionmentioning

confidence: 97%

“…Pedrozo et al (1992) found that values of TP ranged from 100 to 150 μg.l −1 , and values of SRP were lower than 50 μg.l −1 in a study of two lakes. Unrein (2002) reported mean values of TP of 100 μg.l −1 , and values of SRP of 50 μg.l −1 for a lake of the Lower Paraná River, whereas Devercelli et al (2015) found that TN varied between 690 and 1500 μg.l −1 in isolate lakes of the Paraná River floodplain. In our study, concentration of TP and TN in water in Lake 1 during periods of cattle absence were similar than those reported in these works.…”

Section: Discussionmentioning

confidence: 99%

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Nutrient Dynamics in Wetlands of the Middle Paraná River Subjected to Rotational Cattle Management

et al. 2015

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The progressive degradation of wetlands has stressed the need of developing sustainable management strategies for maintaining their ecological character within the context of sustainable development. Rotational cattle grazing is a common grazing strategy in aquatic systems but its effect on nutrient dynamics in lakes is scarcely known. The objectives of this study were to evaluate if cattle produces a significant increase of TN and TP in wetlands, and if the value of these nutrients decrease after cattle are removed. Samples of water, sediment and macrophytes were collected for nutrient, organic matter and other chemical analyses. Results showed a significant increase in water nutrients during the presence of cattle, decreasing during their absence. These changes occurred surprisingly rapid, suggesting a high resilience of these systems to this impact. The presence of submerged vegetation in lakes ameliorated the effect of cattle on water nutrients, suggesting an important role of these plants in ecosystem management. Rotational management would minimize the increase of nutrients in water, maintaining the ecological integrity of wetlands.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

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Nutrient Dynamics in Wetlands of the Middle Paraná River Subjected to Rotational Cattle Management

et al. 2015

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“…In naturally connected ecosystems such as floodplain lakes and complex river systems, water flow is considered the main dispersal vector and both seasonality (duration) and directionality of river flow, as well as water course distances, have an important role in shaping metacommunity in the different ecosystems belonging to the ''network'' (Liu et al, 2013;Padial et al, 2014;Devercelli et al, 2016). However, in the present study, the network system was formed by human-operated reservoirs and both duration and directionality of water flow were strongly subjected to unpredictable constraints linked to the need of the drinking water supply of urban centers.…”

Section: Discussionmentioning

confidence: 99%

“…In many interconnected natural aquatic systems (e.g., floodplain lakes), stochastic factors have been considered more important than deterministic ones to explain the phytoplankton composition and structure (Devercelli et al, 2016). In these systems, dispersal is mediated by water movements (hydrochory), which tend to have a strong homogenizing effect on local communities.…”

Section: Introductionmentioning

confidence: 99%

Phytoplankton assemblages in a complex system of interconnected reservoirs: the role of water transport in dispersal

Hu,

Duan,

Peng

et al. 2017

Hydrobiologia

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Phytoplankton in a complex network of reservoirs for drinking water supply was sampled in the dry and flood seasons to understand the role of dispersal through hydrochory and of environmental filters in determining the phytoplankton abundance and composition. The main assumptions tested in the present study are that (i) phytoplankton structure in these waterbodies is strongly dependent on the transportation with the river waters flowing through them and (ii) the importance of this stochastic transportation is decreasing as the connectivity with the river decreases allowing environmental filters to shape phytoplankton structure. The multivariate analysis showed that although phytoplankton was inoculated largely by Pearl River water inputs and inflow among the system, the hydraulic architecture of the reservoir network shaped and modulated the composition and abundance of phytoplankton.

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Lake regionalization and diatom metacommunity structuring in tropical South America

Benito

Fritz

Steinitz‐Kannan

et al. 2018

Ecology and Evolution

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Lakes and their topological distribution across Earth's surface impose ecological and evolutionary constraints on aquatic metacommunities. In this study, we group similar lake ecosystems as metacommunity units influencing diatom community structure. We assembled a database of 195 lakes from the tropical Andes and adjacent lowlands (8°N–30°S and 58–79°W) with associated environmental predictors to examine diatom metacommunity patterns at two different levels: taxon and functional (deconstructed species matrix by ecological guilds). We also derived spatial variables that inherently assessed the relative role of dispersal. Using complementary multivariate statistical techniques (principal component analysis, cluster analysis, nonmetric multidimensional scaling, Procrustes, variance partitioning), we examined diatom–environment relationships among different lake habitats (sediment surface, periphyton, and plankton) and partitioned community variation to evaluate the influence of niche‐ and dispersal‐based assembly processes in diatom metacommunity structure across lake clusters. The results showed a significant association between geographic clusters of lakes based on gradients of climate and landscape configuration and diatom assemblages. Six lake clusters distributed along a latitudinal gradient were identified as functional metacommunity units for diatom communities. Variance partitioning revealed that dispersal mechanisms were a major contributor to diatom metacommunity structure, but in a highly context‐dependent fashion across lake clusters. In the Andean Altiplano and adjacent lowlands of Bolivia, diatom metacommunities are niche assembled but constrained by either dispersal limitation or mass effects, resulting from area, environmental heterogeneity, and ecological guild relationships. Topographic heterogeneity played an important role in structuring planktic diatom metacommunities. We emphasize the value of a guild‐based metacommunity model linked to dispersal for elucidating mechanisms underlying latitudinal gradients in distribution. Our findings reveal the importance of shifts in ecological drivers across climatic and physiographically distinct lake clusters, providing a basis for comparison of broad‐scale community gradients in lake‐rich regions elsewhere. This may help guide future research to explore evolutionary constraints on the rich Neotropical benthic diatom species pool.

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Unravelling the role of determinism and stochasticity in structuring the phytoplanktonic metacommunity of the Paraná River floodplain

Cited by 54 publications

References 71 publications

Nutrient Dynamics in Wetlands of the Middle Paraná River Subjected to Rotational Cattle Management

Nutrient Dynamics in Wetlands of the Middle Paraná River Subjected to Rotational Cattle Management

Phytoplankton assemblages in a complex system of interconnected reservoirs: the role of water transport in dispersal

Lake regionalization and diatom metacommunity structuring in tropical South America

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