Variation partitioning of diatom species data matrices: Understanding the influence of multiple factors on benthic diatom communities in tropical streams

Bere, Taurai; Mangadze, Tinotenda; Mwedzi, Tongai

doi:10.1016/j.scitotenv.2016.06.058

Cited by 24 publications

(13 citation statements)

References 38 publications

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“…Studies conducted in different geographic regions of the world [14][15][16][17] including the limited studies of tropical and subtropical Africa [18][19][20] indicated that the community assemblages of diatoms were impacted by human induced water quality alterations. Anthropogenic pressure is among the high-level factors that drive diatom community composition in lotic systems [4,[21][22][23]. In addition, diatoms are affected by temporal variation [24,25] since it governs the underlying controlling factors such as hydrological characteristics, biogeochemical processes, and precipitation-induced surface runoff in these systems [26].…”

Section: Introductionmentioning

confidence: 99%

Diatom community structure in relation to environmental factors in human influenced rivers and streams in tropical Africa

et al. 2021

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The contemporaneous effect of natural and anthropogenic factors involved in a watershed contribution to the seasonal and spatial variation of diatom community composition is widely discussed in the scientific literature. Yet, there is a paucity of scientific evidence indicating the effect of these factors on diatoms in tropical African regions characterized by distinct dry and wet seasons and season associated human activities like rainfed agriculture are commonly practiced. We applied multivariate techniques to determine the spatio-temporal drivers of diatom assemblage and diatom species richness in human influenced rivers and streams in Ethiopia. We simultaneously collected water and diatom samples from 24 sampling points during the wet (July) and dry (February) seasons. Both water and diatom samples were processed following standard procedures. We identified 169 species belonging to 45 genera in the studied lotic systems. We found that both season and land use factors were important in defining diatom composition (PERMANOVA, p<0.05) and species richness (ANOVA, p<0.05) patterns. Diatom community composition was driven by conductivity, dissolved oxygen, pH, and turbidity parameters (Monte Carlo permutation test, p<0.05). Besides, diatom species richness was driven by dissolved oxygen, soluble reactive phosphorus, and turbidity (GLMM, p<0.05). The study highlighted physicochemical parameters influenced by seasonal variation and human activity determined the composition of diatoms. This implies that the unique feature of heavy rain during the rainy season in the region followed by extensive flooding aggravated by the steep slope from the highlands to the lowlands plays a major role in shaping the diatom autecology in the region. Therefore, in applying biomonitoring in such regions considering the effect of runoff and dilution is imperative.

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Section: Introductionmentioning

confidence: 99%

Diatom community structure in relation to environmental factors in human influenced rivers and streams in tropical Africa

et al. 2021

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“…Since diatom species have diverse amplitudes of tolerance to metals [e.g. 8,9], Cu exposure is thought to modify community composition towards less sensitive species. Previous studies have demonstrated that an environmentally realistic 15-30µg•L -1 Cu contamination selects for metal-tolerant diatom species under laboratory conditions [10][11][12][13][14], and in the Meuse River at even lower concentrations [below 10µg•L -1…”

Section: Introductionmentioning

confidence: 99%

Changes in copper toxicity towards diatom communities with experimental warming

Morin

Lambert²,

Rodriguez

et al. 2017

Journal of Hazardous Materials

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Biological communities in aquatic environments most commonly face multiple stress, where natural and anthropogenic stressors often act jointly. Their interactions are most easily assessed using short cycle organisms such as periphytic diatoms. In this experiment, we analyzed the combined effects of copper exposure and warming on diatom successions over 6 weeks. Natural biofilm collected in winter was left to grow in mesocosms exposed or unexposed to realistic Cu concentrations at four different temperatures. Separate and joint impacts of the two stressors were determined through structural and functional endpoints. Both temperature and copper influenced the biological responses; their interaction, when significant, was always antagonistic. Diatom communities gradually changed with rising temperature. Under copper exposure, the dominant Planothidium lanceolatum was superseded by Achnanthidium exiguum, which accounted for about 70% relative abundance in the warmest conditions (18-23°C). Tolerance to copper was derived from dose-response curves based on photosynthesis inhibition. Cu-induced community tolerance was always found, but it decreased with warming and time. Biodiversity loss associated with lower Cu tolerance under combined Cu exposure and increasing temperatures evidences the major influence of cumulative stressors on aquatic health. These results highlight the crucial interplay between environmental stressors, which are expected to intensify with climate change.

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“…Understanding how ecological processes are interconnected over multiple spatial scales, ranging from global patterns to local community structures, is extremely important for fundamental and applied ecological research [ 1 ]. Urban rivers and reservoirs are key components of urban landscapes and that their ecological structures are influenced by multiple anthropogenic and natural variables [ 2 , 3 , 4 , 5 ]. Rivers and lakes that are located in urban areas, including river branches, landscape parks, and reservoirs, are influenced by intensive anthropogenic activities, and these ecosystems are vital to the economy and society.…”

Section: Introductionmentioning

confidence: 99%

“…In terms of the long-term conservation and sustainable use of ecosystems, such an integrative assessment model requires knowledge of the structure and function of the natural systems, and how these processes respond to human activities is crucial to assessing the effectiveness of management decisions [ 14 ]. Urban rivers may experience high relative nutrient inputs due to atmospheric deposition, allochthonous inputs and/or sediment mobilisation from the surrounding catchment [ 3 ]. Water chemistry changes have implications for biotic communities, and even a minor change in the physico-chemical parameters can influence primary production [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Relationship between the Main Communities and Environments of an Urban River and Reservoir: Considering Integrated Structural and Functional Assessments of Ecosystems

Tang

Liu

Wang

et al. 2018

IJERPH

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Rivers and reservoirs in urban areas have been associated with environmental quality problems because of the discharge of domestic waste into water bodies. However, the key effects and the extent to which environmental factors can influence the integrated structure and function of urban river ecosystems remain largely unknown. Here, a relationship model involving the species composition of the community and the various environmental factors related to the water and sediment was developed in the dry season (N) and the flood season (F) in both the urban Jiaomen River (JR) and the Baihuitian Reservoir (BR) of Guangzhou City. Canonical correspondence analysis was used to determine the spatiotemporal drivers of the phytoplankton, zooplankton and macrobenthic communities in the river and reservoir systems. The combination of the thermodynamic-oriented ecological indicators and the biodiversity measures reflected the integrated structure and function of the ecosystems. Overall, the plankton community composition was found to be largely determined by the nutrient concentrations and oxygen index, and the development of the macrobenthic communities was mainly restricted by organic matter and heavy metals. Based on the results of the integrated assessment, the structure and function of the JR ecosystem were superior to that of the BR, and the F period displayed healthier results than the N period. Moreover, the structural and functional statuses of the high eco-exergy grade communities (macrobenthic communities) in the ecosystem influenced the regional changes observed in the results of the integrated assessment. The significant seasonal variations in the plankton community affected the seasonal variations in the integrated assessment. The results of this study provide a scientific basis for the management and restoration of regional freshwater environments and ecosystems.

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Variation partitioning of diatom species data matrices: Understanding the influence of multiple factors on benthic diatom communities in tropical streams

Cited by 24 publications

References 38 publications

Diatom community structure in relation to environmental factors in human influenced rivers and streams in tropical Africa

Diatom community structure in relation to environmental factors in human influenced rivers and streams in tropical Africa

Changes in copper toxicity towards diatom communities with experimental warming

Relationship between the Main Communities and Environments of an Urban River and Reservoir: Considering Integrated Structural and Functional Assessments of Ecosystems

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