Determinants of beta diversity: the relative importance of environmental and spatial processes in structuring phytoplankton communities in an Amazonian floodplain

Nogueira, Ina de Souza; Nabout, João Carlos; Ibañez, Maria do Socorro Rodrigues; Bourgoin, Laurence Maurice

doi:10.4322/actalb.02203001

Cited by 22 publications

(19 citation statements)

References 48 publications

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“…Although rarely employed in studies on phytoplankton, the jackknife indexes of the first and second orders (Nabout et al 2007;Nogueira et al 2008) were an important tool for assessing the efficacy of the sampling effort. It should be emphasized that closeness between the observed and the estimated expected species richness indicates that the sampling effort was adequate to reveal the diversity of phytoplankton in the two study rivers (Nogueira et al 2010).…”

Section: Discussionmentioning

confidence: 99%

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Alpha and beta diversity of phytoplankton in two subtropical eutrophic streams in southern Brazil

2015

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This paper reports the alpha and beta diversity of phytoplankton communities of two streams differing in land use. We analyzed which environmental conditions affect diversity of the phytoplankton communities and tested the hypothesis that stream stretches protected by forests will have lower species richness, whereas higher beta-diversity would occur among the non-protected stretches. Samples were taken quarterly, from February to November 2012, in nine stretches, including four non-protected stretches, two partially protected stretches and three totally forest-protected stretches. Eleven abiotic variables and their coefficients of variation were analyzed. Phytoplankton was analyzed for species richness (alpha diversity), frequency of occurrence and beta-diversity. Species richness was calculated by first and second order jackknife indexes. Biotic data were submitted to Sørensen similarity analysis. A total of 429 infrageneric taxa were reported, representing 88% of the estimated expected species richness. The phytoplankton composition was typical for lotic environments with high richness values of Bacillariophyceae (66.0%). High phytoplankton richness values occurred in all the sampled stretches, even though beta-diversity was moderate and indicated similarity between the sampled stretches, therefore only a part of the original hypothesis was corroborated.

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Section: Discussionmentioning

confidence: 99%

“…Of these, the studies of Huszar et al (1990), Nabout et al (2007), Nogueira et al (2008), Nogueira et al (2010) and Pires (2014) should be highlighted, although these studies only evaluated alpha-and beta-diversity in lentic environments.…”

Section: Introductionmentioning

confidence: 99%

Alpha and beta diversity of phytoplankton in two subtropical eutrophic streams in southern Brazil

2015

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“…Recent theoretical developments, such as the partitioning framework of β‐diversity or the use of null models (Baselga, ; Jost et al ., ; Azeria et al ., ; Legendre, ), have proved useful to deciphering the relative importance of local versus regional processes in shaping community structure across scales (Viana et al ., ). The applications of these methods to freshwater phytoplankton are still scarce (Nogueira et al ., ; Angeler, ) despite it may shed new light on the factors shaping their distribution in space and time. Within the context of biodiversity erosion in most ecosystems on Earth, which imperils the provision of ecosystem functions and services, it is critical to determine the factors that maintain a high level of regional phytoplankton diversity, which would buffer local communities against taxonomic and functional impoverishment (Loreau, Mouquet & Gonzalez, ; Mellin et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Environmental heterogeneity among lakes promotes hyper β‐diversity across phytoplankton communities

et al. 2016

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1. The extent to which stochastic and deterministic processes influence variations in species communities across space and time remains a central question in theoretical and applied ecology. Despite their high dispersal ability, the composition of phytoplankton communities displays striking spatial variations among lakes even at small spatial scale. 2. To investigate the mechanisms underlying the distribution of phytoplankton species, we evaluate the contribution of stochastic, spatial and environmental processes in determining b-diversity patterns of phytoplankton at a regional scale. Phytoplankton communities were surveyed in 50 different lakes from north-central France, a region characterised by strong environmental heterogeneity. 3. The regional species pool was characterised by extremely high b-diversity levels, which were mainly explained by species replacement (i.e. turnover) rather than by differences in species richness (i.e. nestedness). Null models of random species distribution and spatial processes failed to explain observed b-diversity patterns. At the opposite, local environmental conditions strongly influenced the degree of uniqueness of local phytoplankton communities, with the most contrasted environments, including human-dominated areas, promoting highly distinct phytoplankton communities. 4. Our results suggest that species-sorting mechanisms that arise from variations in local environmental conditions drive high species turnover at the region scale. Thus, in a landscape strongly impacted by cultural eutrophication, further anthropogenic impacts on aquatic ecosystems would likely induce regional homogenisation of phytoplankton communities. Overall, our study supports the fact that the management of lakes and reservoirs in anthropic landscapes should aim at maintaining environmental heterogeneity while preventing further eutrophication in order to favour the maintenance of high phytoplankton b-and c-diversity.

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“…Such phytoplankton blooms extend over large areas during the period of decreasing water levels from July to September. The phytoplankton composition is dominated by Cyanophyceae with a significant proportion of Bacillariophyceae and Chlorophyceae [Nogueira et al, 2010]. Figure 1 shows the locations of the 42 stations where radiometric measurements were made from 2007 to 2011.…”

Section: Introductionmentioning

confidence: 99%

The optical properties of river and floodplain waters in the Amazon River Basin: Implications for satellite‐based measurements of suspended particulate matter

et al. 2015

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Satellite images can now be used to assess river sediment discharge, and systematic studies over rivers and lakes are required to support such applications and document the variability of inland water optical properties at the watershed scale. The optical properties of the Amazon Basin waters were analyzed from in situ measurements of the remote sensing reflectance (R rs ) at 279 stations and downwelling diffuse attenuation coefficients (K d ) at 133 stations. Measurements of the apparent optical properties, suspended particulate matter (SPM) contents, and characteristics and colored dissolved organic matter (CDOM) absorption spectra were performed during 16 cruises along the main Amazonian Rivers draining the Andes and for some tributaries. Surface-suspended sediment granulometry and mineralogy showed a stable distribution at the catchment scale, even over large distances and between tributaries. The particle number-size distribution was best described using a segmented distribution with a slope of 2.2 for the fine range (1-15 μm), and the CDOM absorption coefficient at 440 nm varied from 1.8 to 7.9 m À1 . Overall, both R rs and K d were strongly correlated with SPM, although strong CDOM absorption limited the use of the blue spectrum. Reflectance saturation from blue to red was observed at approximately 100 g m À3 , whereas the near-infrared (NIR) wavelength enabled the monitoring of the full SPM range (5-620 g m À3 ). In contrast, K d showed no saturation for SPM from green to NIR, and a linear model was calculated. The use of the reflectance ratio was investigated and shown to improve the suspended sediment concentration retrieval performance.

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Determinants of beta diversity: the relative importance of environmental and spatial processes in structuring phytoplankton communities in an Amazonian floodplain

Abstract: Determinantes da diversidade beta: a importância relativa de processos ambientais e espaciais na estrutura de comunidades fitoplanctônicas de uma planície de inundação amazônica

Cited by 22 publications

References 48 publications

Alpha and beta diversity of phytoplankton in two subtropical eutrophic streams in southern Brazil

Alpha and beta diversity of phytoplankton in two subtropical eutrophic streams in southern Brazil

Environmental heterogeneity among lakes promotes hyper β‐diversity across phytoplankton communities

The optical properties of river and floodplain waters in the Amazon River Basin: Implications for satellite‐based measurements of suspended particulate matter

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