Environmental factors structuring diatom assemblages in thermo-mineral springs of Sardinia (Italy)

2021 ◽  
Author(s):  
Giuseppina Grazia Lai ◽  
Luc Ector ◽  
Carlos E. Wetzel ◽  
Antonella Lugliè ◽  
Bachisio M. Padedda
Keyword(s):  
Environmental Factors ◽  
Diatom Assemblages ◽  
Mineral Springs

scholarly journals Surface Sediment Diatom Assemblages Response to Water Environment in Dongping Lake, North China

Water ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 339
Author(s):  
Shuangshuang Liu ◽  
Min Yao ◽  
Shiyue Chen ◽  
Xingzhong Yuan
Keyword(s):  
Environmental Factors ◽  
Water Environment ◽  
Oxygen Demand ◽  
Diatom Assemblages ◽  
Multivariate Statistical ◽  
Dongping Lake ◽  
Autumn And Winter ◽  
Response To Water ◽  
The Relationship ◽  
Significant Factors

The relationship between the diatom taxa preserved in surface lake sediments and environmental variables in Dongping Lake was explored using multivariate statistical methods. The statistical analysis showed that the lake was eutrophicated in all seasons. Transparency, chlorophyll a (Chla) and total phosphorus (TP) were the dominant environmental factors in spring and summer, and NH4+-N and chemical oxygen demand (COD) were the dominant environmental factors in autumn and winter. Sixteen genera and 43 species of diatom were found in the surface sediments, and the dominant diatom genera were Aulacoseira, Ulnaria, Cyclotella, Navicula and Fragilaria. A redundancy analysis (RDA) and Monte Carlo permutation 20 test revealed that COD, pH, TP, conductivity and transparency were significant factors influencing diatom assemblage change, meaning that the distribution of the diatom assemblages were mostly influenced by nutrient composition, light intensity and ion concentrations.

scholarly journals Factors driving diversity and succession of diatom assemblages in a Neotropical rainforest stream

2018 ◽  
Vol 54 ◽  
pp. 30 ◽  
Author(s):  
Jhon Charles Donato Rondón ◽  
Yaira Ayarith Abuhatab Aragón
Keyword(s):  
Environmental Factors ◽  
Solar Radiation ◽  
Shannon Index ◽  
Diatom Assemblages ◽  
Fluvial Systems ◽  
Neotropical Streams ◽  
Biogeographic Region ◽  
Nitrate Concentrations ◽  
Taxonomic Changes ◽  
Neotropical Rainforest

This study assessed short-term succession and related changes in diversity and succession of benthic diatom assemblages in a tropical rainforest stream in the biogeographic region of Chocó, Colombia. Diatom colonization in situ was studied over a 60-day period, in which we analyzed the number of valves and the taxonomic changes. The Shannon index ranged from 2.06 to 3.02 bits. A total of 127 species were identified and the most abundant were acidophilic species such as Eunotia intermedia, E. veneris, E. bilunaris var. mucophila, E. pirla and E. bilunaris. A Detrended Canonical Correspondence Analysis (DCCA) was used to explore the succession of diatom assemblages and its driving environmental factors. The DCCA explained 74.1% of the correlation between environmental variables and diatom species and 16.2% of the data variance. The species fell into four groups, the first group (Eunotia incisa, Frustulia saxonica, Fragilaria capucina var. acatu, among others) was related to lower nitrate concentrations, acidic pH and lower water temperature. The second group (Fragilaria capensis, Gomphonema olivaceum, Cymbella gracilis, among others) was associated to higher alkalinity and lower solar radiation availability. The third group (Nitzschia obtusa, N. amphibia, Naviculadicta vitabunda, Navicula cryptocephala, among others) was related to lower phosphate, higher nitrate concentrations, lower pH, and higher temperatures. The fourth group (Eunotia soleirolli, Frustulia vulgaris and F. rhomboides) was associated with higher solar radiation and lower alkalinity. These results underscore the importance of diatom diversity in Neotropical streams and the relevance of small variations in environmental factors on the composition of reference assemblages of Neotropical fluvial systems.

Temporal and spatial distribution of diatom assemblages and their relationship with environmental factors in Balikhli River (NW Iran)

2020 ◽  
Vol 20 (1) ◽  
pp. 102-111
Author(s):  
Jamileh Panahy Mirzahasanlou ◽  
Zohreh Ramezanpour ◽  
Taher Nejadsattari ◽  
Javid Imanpour Namin ◽  
Younes Asri
Keyword(s):  
Spatial Distribution ◽  
Environmental Factors ◽  
Diatom Assemblages ◽  
Temporal And Spatial Distribution ◽  
Nw Iran ◽  
Temporal And Spatial

scholarly journals Diatom assemblages and their associated environmental factors in upland peat forest rivers

2012 ◽  
Vol 18 ◽  
pp. 443-451 ◽  
Author(s):  
Connie O’Driscoll ◽  
Elvira de Eyto ◽  
Michael Rodgers ◽  
Mark O’Connor ◽  
Zaki-ul-Zaman Asam ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Diatom Assemblages

scholarly journals Similar small-scale variation of diatom assemblages on different substrates in a mesotrophic stream

2015 ◽  
Vol 74 (2) ◽  
pp. 363-376 ◽  
Author(s):  
Maria Kahlert ◽  
Ivana Savatijević Rašić
Keyword(s):  
Environmental Factors ◽  
Species Composition ◽  
Spatial Variation ◽  
Anthropogenic Impacts ◽  
Sampling Site ◽  
Small Distance ◽  
Benthic Diatom ◽  
Small Scale ◽  
Diatom Species ◽  
Diatom Assemblages

Abstract The aim of the present study was to analyze if small-scale spatial variation of benthic diatom assemblages has consequences for biomonitoring. Benthic diatom samples were collected at one sampling site in a mesotrophic stream in Middle-Sweden from stone and plant (macrophytes and mosses) substrate. Our results showed that spatial variation of both the diatom species composition and the calculated bioindices were similar on both small (distance of centimeter) and medium (distance of decimeters) scales. Spatial variation was also similar on both studied substrates. This implies that it does not matter if a small or a larger area is sampled for biomonitoring as long as no major environmental factors impact certain sites systematically. Diatom assemblages and indices were significantly different between substrates. Spatial variation did not contribute much to this variation, and variation on a slide was unimportant. These results confirm earlier findings that smallscale spatial variation is not a problem when using diatoms to detect anthropogenic impacts to a stream or lake.

Evaluation of relationship between environmental factors and diatom assemblages at genus and species levels in the Taizi River Basin, China

2014 ◽  
Vol 34 (22) ◽  
Author(s):  
刘麟菲 LIU Linfei ◽  
谭冰冰 TAN Bingbing ◽  
殷旭旺 YIN Xuwang ◽  
张远 ZHANG Yuan ◽  
孟伟 MENG Wei
Keyword(s):  
Environmental Factors ◽  
River Basin ◽  
Diatom Assemblages ◽  
Taizi River Basin ◽  
Taizi River

scholarly journals Diversity, ecology and distribution of benthic diatoms in thermo-mineral springs in Auvergne (France) and Sardinia (Italy)

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7238 ◽  
Author(s):  
Giuseppina G. Lai ◽  
Aude Beauger ◽  
Carlos E. Wetzel ◽  
Bachisio M. Padedda ◽  
Olivier Voldoire ◽  
...  
Keyword(s):  
Environmental Variables ◽  
Multivariate Analyses ◽  
Climatic Factors ◽  
Geographic Region ◽  
Species Level ◽  
Diatom Assemblages ◽  
Mineral Springs ◽  
Diatom Flora ◽  
Crucial Step ◽  
Fine Sediments

This study investigated and compared the diatom flora from thermo-mineral springs in Auvergne (France) and Sardinia (Italy). Samples were collected from rock/cobbles and fine sediments in 16 springs between January 2015 and March 2017. A total of 207 taxa (59 genera) were found. Multivariate analyses revealed significant differences in species composition and abundance among diatom assemblages both within each geographic region and between Auvergne and Sardinia (global R = 0.516; p = 0.002), suggesting the importance of local and climatic factors in species distribution. Based on abundance and common occurrence in multiple sites, some taxa can be considered more representative of springs in each region: Crenotia thermalis for Auvergne and Lemnicola exigua, Nitzschia amphibia, N. inconspicua and Rhopalodia operculata for Sardinia. pH, conductivity and HCO3− were the most significant environmental variables for diatom assemblages. Our results highlight the high heterogeneity of these spring systems. Future taxonomic insights can be useful to define the identity of some abundant and dominant taxa not identified at the species level in this study. Their identification is a crucial step for a more precise ecological characterization and comparison of these peculiar spring systems.

Reductionist thinking and animal models in neuropsychiatric research

2019 ◽  
Vol 42 ◽  
Author(s):  
Nicole M. Baran
Keyword(s):  
Animal Models ◽  
Mental Disorders ◽  
Environmental Factors ◽  
Neuropsychiatric Disorders ◽  
Model Organisms ◽  
Developmental Genetic ◽  
Term Study ◽  
Genetic And Environmental Factors ◽  
Mechanisms Of Plasticity

AbstractReductionist thinking in neuroscience is manifest in the widespread use of animal models of neuropsychiatric disorders. Broader investigations of diverse behaviors in non-model organisms and longer-term study of the mechanisms of plasticity will yield fundamental insights into the neurobiological, developmental, genetic, and environmental factors contributing to the “massively multifactorial system networks” which go awry in mental disorders.

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