The relative importance of species diversity and functional group diversity on carbon uptake in phytoplankton communities

2011 ◽  
Vol 56 (2) ◽  
pp. 683-694 ◽  
Author(s):  
Stephan Behl ◽  
Anne Donval ◽  
Herwig Stibor
Keyword(s):  
Species Diversity ◽  
Functional Group ◽  
Carbon Uptake ◽  
Relative Importance ◽  
Phytoplankton Communities ◽  
Group Diversity

scholarly journals Effects of fertilization, burning, and grazing on plant community in the long-term fenced grasslands  

2017 ◽  
Vol 63 (No. 4) ◽  
pp. 171-176 ◽  
Author(s):  
Jing Guanghua ◽  
Li Wei ◽  
Yu Kailiang ◽  
Ratajczak Zak ◽  
Kallenbach Robert L ◽  
...  
Keyword(s):  
Species Diversity ◽  
Plant Community ◽  
Aboveground Biomass ◽  
Management Practices ◽  
Functional Group ◽  
Management Practice ◽  
Grassland Productivity ◽  
Group Diversity ◽  
Positive Effect

Fencing is the common management practice to restore degraded grasslands. However, long-term fencing decreases grassland productivity and species diversity. The study was therefore conducted as a three-year (2011–2013) experiment with a randomized complete block in a grassland fenced for 20 years in the Loess Plateau of China, and the effects of fertilization, burning and grazing on aboveground biomass, species and functional group composition, species and some functional group diversity were analysed. Our results showed that the functional group of perennial bunchgrasses dominated the grassland regardless of management practices. However, burning altered species composition (i.e. the unpalatable species, Artemisia sacrorum) more significantly than fertilization or grazing, and surprisingly, nearly quadrupled the functional group of shrubs and semi-shrubs. Fertilization had a positive effect on the aboveground biomass (44.0%), while clearly reducing species diversity (21.9%). Grazing decreased aboveground biomass, but increased species diversity by 15.9%. This study indicated that fertilization influenced plant community through its impact on aboveground biomass, while burning changed plant community by altering dominant species. Thus, it was concluded that fertilizer could further improve community biomass while burning reduced the edibility of grass. Grazing could be carried out to enhance the biodiversity in the long-term fenced grasslands.  

Drought tolerance is determined by species identity and functional group diversity rather than by species diversity within multi-species swards

2020 ◽  
Vol 119 ◽  
pp. 126116
Author(s):  
Martin Komainda ◽  
Frank Küchenmeister ◽  
Kai Küchenmeister ◽  
Manfred Kayser ◽  
Nicole Wrage-Mönnig ◽  
...  
Keyword(s):  
Species Diversity ◽  
Drought Tolerance ◽  
Functional Group ◽  
Species Identity ◽  
Group Diversity

scholarly journals Is the impact of eutrophication on phytoplankton diversity dependent on lake volume/ecosystem size?

2016 ◽  
Author(s):  
Didier L. Baho ◽  
Stina Drakare ◽  
Richard K. Johnson ◽  
Craig R. Allen ◽  
David G. Angeler
Keyword(s):  
Species Diversity ◽  
Growing Season ◽  
Phytoplankton Diversity ◽  
Habitat Features ◽  
Anthropogenic Stressors ◽  
Lake Volume ◽  
Ecosystem Size ◽  
Phytoplankton Communities ◽  
The Impact ◽  
Local Habitat

<p>Research focusing on biodiversity responses to the interactions of ecosystem size and anthropogenic stressors are based mainly on correlative gradient studies, and may therefore confound size-stress relationships due to spatial context and differences in local habitat features across ecosystems. We investigated how local factors related to anthropogenic stressors (<em>e.g.,</em> eutrophication) interact with ecosystem size to influence species diversity. In this study, constructed lake mesocosms (with two contrasting volumes: 1020 (shallow mesocosms) and 2150 (deep mesocosms) litres) were used to simulate ecosystems of different size and manipulated nutrient levels to simulate mesotrophic and hypertrophic conditions. Using a factorial design, we assessed how the interaction between ecosystem size and nutrients influences phytoplankton diversity. We assessed community metrics (richness, diversity, evenness and total biovolumes) and multivariate community structure over a growing season (May to early November 2011). Different community structures were found between deep and shallow mescosoms with nutrient enrichment: Cyanobacteria dominated in the deep and Charophyta in the shallow mesocosms. In contrast, phytoplankton communities were more similar to each other in the low nutrient treatments; only Chlorophyta had generally a higher biovolume in the shallow compared to the deep mesocosms. These results suggest that ecosystem size is not only a determinant of species diversity, but that it can mediate the influence of anthropogenic effects on biodiversity. Such interactions increase the uncertainty of global change outcomes, and should therefore not be ignored in risk/impact assessment and management.</p>

scholarly journals The effects of earthworm functional group diversity on earthworm community structure

Pedobiologia ◽  
2007 ◽  
Vol 50 (6) ◽  
pp. 479-487 ◽  
Author(s):  
Cróna Sheehan ◽  
Laura Kirwan ◽  
John Connolly ◽  
Thomas Bolger
Keyword(s):  
Community Structure ◽  
Functional Group ◽  
Group Diversity

Expedient iron-catalyzed stereospecific synthesis of triazines via cycloaddition of aziridines with diaziridines

2020 ◽  
Vol 56 (23) ◽  
pp. 3381-3384 ◽  
Author(s):  
Tanumay Sarkar ◽  
Kangkan Talukdar ◽  
Subhasish Roy ◽  
Tharmalingam Punniyamurthy
Keyword(s):  
Functional Group ◽  
Stereospecific Synthesis ◽  
Group Diversity

An iron(iii)-catalyzed [3+3]-annulation of bicyclic diaziridines and N-alkyl aziridines is developed for the synthesis of functionalized [1,2,4]-triazines. Ample substrate scope, functional group diversity, synthetic applications and enantiospecificity are the important practical features.

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