Altitudinal pattern of stream periphyton biomass in tributaries of the Lancang–Mekong River: An indicator of anthropogenic impact?

He, Fengzhi; Dong, Xiaoyu; Sun, Meiqin; Cai, Qinghua

doi:10.1016/j.quaint.2014.12.024

Cited by 9 publications

(9 citation statements)

References 61 publications

(74 reference statements)

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“…High altitudes are frequently characterised by lower TDS, water temperature, and nutrient concentrations in alpine rivers (He et al, 2015), in accordance with the results of the present study. The nutrient concentration, salinity, TDS, and water temperature were relatively high at low altitudes.…”

Section: Discussionsupporting

confidence: 92%

“…The nutrient concentration, salinity, TDS, and water temperature were relatively high at low altitudes. Similar results had been detected in the Lancang River and rivers on the Qinghai‐Tibet Plateau in China (He et al, 2015; Ren et al, 2013). The spatial heterogeneity of these factors may be attributed to the intensified anthropogenic influence caused by altered land‐use patterns, as more farmland and settlement occur in flat areas with low gradients.…”

Section: Discussionsupporting

confidence: 85%

“…The spatial heterogeneity of these factors may be attributed to the intensified anthropogenic influence caused by altered land‐use patterns, as more farmland and settlement occur in flat areas with low gradients. Thus, downstream reaches are often subjected to the discharge of agricultural and domestic wastewater (He et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

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Distribution and photosynthetic potential of epilithic periphyton along an altitudinal gradient in Jue River (Qinling Mountain, China)

Hao

Sun

et al. 2022

Freshwater Biology

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1. Periphyton in aquatic ecosystems play a crucial ecological role in element cycling and are susceptible to natural disturbances and anthropogenic activities.To understand the responses of periphytic communities to water quality factors and altitude gradients, DNA metabarcoding was employed to investigate the distribution characteristics of epilithic periphyton (comprising prokaryotes and eukaryotes).2. Epilithic periphyton and water were sampled at 26 sampling sites with an altitude ranging from 445 to 1,565 m in the Jue River and its three tributaries in Qinling Mountain, China. The altitudinal patterns of water quality variables were initially investigated, followed by redundancy analysis and distance-based linear models to explore the responses of community structure to altitudes and water quality. Meanwhile, the relationship between these variables and fluorescence parameters to reflect the photosynthesis of epilithic periphyton along an altitudinal gradient was examined.3. The results indicated that with decreasing elevation, water quality variables including total dissolved solids (TDS), water temperature, conductivity, salinity, and concentrations of NO − 3 -N, total nitrogen, and NO − 2 -N increased. This pattern was closely associated with the intensification of anthropogenic disturbance downstream. Specifically, higher salinity and water temperature downstream may reduce the prokaryotic biodiversity but promote the diversity and evenness of eukaryotes; higher concentrations of total nitrogen may increase the diversity, richness, and evenness of the whole periphyton community. Furthermore, salinity, nutrients, and TDS were identified as crucial variables shaping periphyton community structure, especially salinity and TDS, which were linked to the growth of chlorophytes.4. The attenuated maximum photochemical efficiency of periphyton at high altitudes indicated that photosystem II was inhibited, while the enhancement of maximum photochemical efficiency at low altitudes may be attributed to the

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 85%

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Distribution and photosynthetic potential of epilithic periphyton along an altitudinal gradient in Jue River (Qinling Mountain, China)

Hao

Sun

et al. 2022

Freshwater Biology

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“…Microbes have not been as extensively studied in the context of elevational gradients, but the past decade has seen an increasing number of studies examining elevational patterns of bacteria in soil [6,[8][9][10][11][12][20][21][22] and to a lesser extent, aquatic habitats [23][24][25][26]. Similar studies have also been conducted for fungi [27][28][29][30][31][32][33][34][35] and protists [18,[36][37][38][39]. Of these microbial elevational gradient studies, only a handful have compared diversity patterns of syntopic microbes and macrobes coinhabiting the same microhabitats.…”

Section: Introductionmentioning

confidence: 99%

Investigation of an Elevational Gradient Reveals Strong Differences Between Bacterial and Eukaryotic Communities Coinhabiting Nepenthes Phytotelmata

et al. 2020

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Elevation is an important determinant of ecological community composition. It integrates several abiotic features and leads to strong, repeatable patterns of community structure, including changes in the abundance and richness of numerous taxa. However, the influence of elevational gradients on microbes is understudied relative to plants and animals. To compare the influence of elevation on multiple taxa simultaneously, we sampled phytotelm communities within a tropical pitcher plant (Nepenthes mindanaoensis) along a gradient from 400 to 1200 m a.s.l. We use a combination of metabarcoding and physical counts to assess diversity and richness of bacteria, micro-eukaryotes, and arthropods, and compare the effect of elevation on community structure to that of regulation by a number of plant factors. Patterns of community structure differed between bacteria and eukaryotes, despite their living together in the same aquatic microhabitats. Elevation influences community composition of eukaryotes to a significantly greater degree than it does bacteria. When examining pitcher characteristics, pitcher dimorphism has an effect on eukaryotes but not bacteria, while variation in pH levels strongly influences both taxa. Consistent with previous ecological studies, arthropod abundance in phytotelmata decreases with elevation, but some patterns of abundance differ between living inquilines and prey.

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“…Currently, stream biodiversity in high mountain regions remains poorly studied despite that high mountain regions provide excellent environments for examining biodiversity patterns (Körner, 2007). In addition, the Hengduan mountains region is subject to increasing threats regarding human impact and climate change (Moseley, 2006;Xu and Wilkes;Wischnewski et al, 2011;He et al, 2015a). Understanding underlying mechanisms of spatial variation in biodiversity patterns and disentangling effects of dispersal and local environmental factors in shaping metacommunities in high mountain streams can provide scientific basis for future biomonitoring, conservation, and restoration in these regions (Tonkin et al, 2018;Heino, 2013).…”

Section: Discussionmentioning

confidence: 99%

Altitudinal pattern of stream periphyton biomass in tributaries of the Lancang–Mekong River: An indicator of anthropogenic impact?

Cited by 9 publications

References 61 publications

Distribution and photosynthetic potential of epilithic periphyton along an altitudinal gradient in Jue River (Qinling Mountain, China)

Distribution and photosynthetic potential of epilithic periphyton along an altitudinal gradient in Jue River (Qinling Mountain, China)

Investigation of an Elevational Gradient Reveals Strong Differences Between Bacterial and Eukaryotic Communities Coinhabiting Nepenthes Phytotelmata

Elevation, aspect, and local environment jointly determine diatom and macroinvertebrate diversity in the Cangshan Mountain, Southwest China

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