Explanatory variables associated with diversity and composition of aquatic macrophytes in a large subtropical river floodplain

Schneider, Berenice; Cunha, Eduardo Ribeiro; Marchese, Mercedes; Thomaz, Sidinei Magela

doi:10.1016/j.aquabot.2014.11.003

Cited by 44 publications

(33 citation statements)

References 44 publications

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“…Our results support previous studies which suggest that, in freshwater systems, local driving factors (chemical, physical or biological) seem to be of overriding importance in determining whether or not macrophyte diversity at an individual site is depressed below the optimal level within a given geographical region (e.g. Baattrup-Pedersen, Szoszkiewicz, Nijboer, O'Hare, & Ferreira, 2006;Bando et al, 2015;Chappuis et al, 2012;Kennedy et al, 2015;Lang & Murphy, 2012;Morandeira & Kandus, 2015;Rolon & Matchik, 2006;Schneider et al, 2015;Tapia Grimaldo et al, 2016). Physical size of individual rivers, however, seemed to be of little importance in influencing a-diversity.…”

Section: Discussionsupporting

confidence: 91%

“…In contrast, there has been quite a substantial macrophyte survey effort in the Neotropics, particularly in South American freshwater systems (e.g. Amaral, Bittrich, Faria, Anderson, & Aona, 2008;Bando, Michelan, Cunha, Figueiredo, & Thomaz, 2015;Bertoli, 1996;Bottino, Calijuri, & Murphy, 2014;Murphy et al, 2003;Neiff, Casco, Mari, Di Rienzo, & Poi, 2014;Rolon & Matchik, 2006;Schneider, Cunhab, Marchese, & Thomaz, 2015;Sousa, Thomaz, & Murphy, 2010Thomaz, Carvalho, Padial, & Kobayashi, 2009;Varandas Martins et al, 2013), although less so in Central America (e.g. Anonymous, 1999;Bonilla-Barbosa, 2004;Crow, 1993;Philbrick & Alejandro, 1995).…”

Section: Amorosmentioning

confidence: 99%

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Environmental drivers of freshwater macrophyte diversity and community composition in calcareous warm‐water rivers of America and Africa

et al. 2017

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This study assessed the hypothesis that spatial and environmental drivers of river macrophyte diversity and community composition differ in relative importance in calcareous river systems located in warm regions of America versus Africa. We collected aquatic vegetation and spatio‐environmental data, during 2006–11, from >200 hardwater rivers, and associated floodplain waterbodies, located up to 30° north or south of the Equator, in México, Trinidad, Brazil, Argentina, U.S.A. (Florida), South Africa, Botswana and Zambia. Species rarefaction procedures were used to assess the impacts of differing sampling effort in the two continents upon estimation of γ‐diversity (“species pool”). We then used a cluster analysis approach (two‐way indicator species analysis: TWINSPAN) to classify samples into groups based upon species composition. Variation in species richness, community composition and six spatial and environmental variables, among samples making up these groups, were compared using ANOVA and Kruskal–Wallis procedures. Regression trees and redundancy analysis were used to infer the relative importance of spatial and environmental drivers in explaining variation in local species richness and species community composition between the two continents. Sorensen's index (Cs) was calculated to estimate species turnover (β‐diversity) between African and American samples. In total, 378 macrophyte taxa were recorded, with no significant difference in mean macrophyte α‐diversity between African and American sites, but with evidence for high species turnover between the two continents (Cs = 0.17). Rarefaction analysis confirmed the existence of a larger macrophyte species pool in the hardwater rivers sampled in Africa compared to America. TWINSPAN classification identified seven sample end‐groups, only one of which contained a mix of sites from both continents. PERMANOVA and non‐metric multidimensional scaling ordination analysis confirmed significant differences in community composition present in these sample‐groups. There were substantial differences between the sample‐groups for α‐diversity, and for spatial and environmental variables. The high species turnover between Africa and America may be accounted for by geographical segregation, along with differences in aquatic habitat characteristics, and varying long‐distance dispersal capacities of individual species. The relative importance of spatial and physicochemical drivers (latitude, pH, altitude, alkalinity and electrical conductivity but not flow) differed between the continents in influencing variation in both macrophyte diversity and community composition. Latitude was a significant, although nonlinear and rather complex, spatial driver of macrophyte α‐diversity in both American and African hardwater rivers. Water chemistry variables varied in relative importance as drivers of macrophyte α‐diversity for African and American sites individually, and for all sites combined, but pH and/or electrical conductivity were more important than alkalinity in each cas...

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Section: Discussionsupporting

confidence: 91%

Section: Amorosmentioning

confidence: 99%

Environmental drivers of freshwater macrophyte diversity and community composition in calcareous warm‐water rivers of America and Africa

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Our results are in keeping with the findings of several previous studies (e.g., Chappuis et al, 2014;Schneider et al, 2015). However, the fact that the macrophyte communities appear to be driven by sediment TPsed to a greater extent than by the TN concentration in water, and above all that the water TP is not significantly related to the macrophyte distribution patterns suggests that sediment parameters play a more important role than water conditions in the spatial arrangement of macrophytes.…”

Section: Environmental Determinantssupporting

confidence: 82%

Aquatic vegetation in deep lakes: Macrophyte co-occurrence patterns and environmental determinants

Azzella¹,

Bresciani

Nizzoli

et al. 2017

J Limnol

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Our aims were to test the hypothesis that in deep lakes the co-occurrence patterns of macrophytes are not random, and to compare the relative contribution of the main environmental determinants (light, water and sediment parameters, phytoplankton) in structuring aquatic vegetation. We collected data from five deep Chara-dominated lakes in Central Italy along gradients of depth (33 to 165 m), dimension (1.7 to 114.5 km 2 ) and water trophic conditions (12.4 to 41.3 μg L -1 of total phosphorous). Twenty-five sampling plots per lake were randomly selected at five predetermined depths (1.5, 3.0, 6.0, 12.0 and 20.0 m; n=5) within homogenous littoral sectors. Data were explored by a null model analysis using the checkerboard score (C-score) index, and Canonical Correspondence Analysis. Our data verify the not random co-occurrence patterns of macrophyte' communities in deep lakes. However, present data suggested that C-scores are strictly dependent on lake' trophic status: low nutrient loads, in both water and sediments, seemed to be reflected in a not random co-occurrence zonation of macrophytes. Summarizing, it is fundamental evaluate the local effects of lake trophy on the macrophyte community dynamics both in time and space before inquiring about mutual links. If it fails to assess macrophyte co-occurrence patterns, it may be not possible to identify the determinants of the spatial arrangement of macrophytes and, in turn, the conservation status or the ongoing dynamics of lakes.

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“…Even if the resuspension probability is always binary (1 = resuspension, or 0 = no resuspension) and identifies the occurrence of a disturbance, it does not give the intensity of the force induced by waves. Wave disturbance in PAR has probably a more important impact on plant morphological features, as reported by some authors for large lakes (Schneider et al, 2015;Schutten et al, 2004). In further research, it would be thus interesting to include the maximum orbital velocity in the model.…”

Section: Plants Morphological Traits and Hydrodynamicsmentioning

confidence: 97%

Effects of wind-induced sediment resuspension on distribution and morphological traits of aquatic weeds in shallow lakes

Bertrin¹,

Boutry²,

Jan³

et al. 2017

J Limnol

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The spread of invasive aquatic plants (i.e., aquatic weeds) requires a broader knowledge of the factors determining their settlement at the lake scale, in order to improve management practices and biomonitoring. Among hydrodynamic pressures, wave action might influence submerged vegetation distribution in shallow lakes and potentially engender modifications of plant morphological traits. We here report a field survey conducted between 2014 and 2015 in French Atlantic Lakes to assess the spatial distribution and biomass production of two rooted aquatic weeds, Egeria densa Planch. and Lagarosiphon major (Ridl.) Moss, in relation to wind-induced sediment resuspension, water depth and sedimentary features. Moreover, we explored the relation between plant morphological traits and hydrodynamic disturbance under in situ conditions. At the lake scale, E. densa and L. major formed extensive monospecific stands, and occurred in the same areas only at low biomass. Both monospecific and mixed stands preferentially developed in shallow-sheltered or deep-exposed areas. Plant morphological traits showed different patterns in function of sediment resuspension according to the species and the lake. The influence of resuspension was however not systematic, with many cases where morphological traits were not affected at all. Maximum stem length appeared to be the most correlated trait towards sediment resuspension. Moreover, we found a significant correlation between the biomass and the sedimentary organic matter, indicating an interaction between the organic substrate preference of the plants and the effect of the canopy on fine particles sedimentation. On the whole, we highlighted the link between plant distribution, phenotypic plasticity and sediment resuspension, with calm-water zones favouring the settlement of dense vegetated stands. Our study could thus contribute to improve prediction models for identifying suitable areas for potential colonization by aquatic weeds. Further research is needed to better understand the role played by hydraulic forces in structuring the habitats in shallow lakes.

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Explanatory variables associated with diversity and composition of aquatic macrophytes in a large subtropical river floodplain

Cited by 44 publications

References 44 publications

Environmental drivers of freshwater macrophyte diversity and community composition in calcareous warm‐water rivers of America and Africa

Environmental drivers of freshwater macrophyte diversity and community composition in calcareous warm‐water rivers of America and Africa

Aquatic vegetation in deep lakes: Macrophyte co-occurrence patterns and environmental determinants

Effects of wind-induced sediment resuspension on distribution and morphological traits of aquatic weeds in shallow lakes

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