scholarly journals Phytoplankton species richness, evenness, and production in relation to nutrient availability and imbalance

2017 ◽  
Vol 62 (4) ◽  
pp. 1393-1408 ◽  
Author(s):  
Sirpa Lehtinen ◽  
Timo Tamminen ◽  
Robert Ptacnik ◽  
Tom Andersen
Keyword(s):  
Species Richness ◽  
Nutrient Availability ◽  
Phytoplankton Species

scholarly journals Global pattern of phytoplankton diversity driven by temperature and environmental variability

2019 ◽  
Vol 5 (5) ◽  
pp. eaau6253 ◽  
Author(s):  
Damiano Righetti ◽  
Meike Vogt ◽  
Nicolas Gruber ◽  
Achilleas Psomas ◽  
Niklaus E. Zimmermann
Keyword(s):  
Species Richness ◽  
Environmental Variability ◽  
Species Turnover ◽  
Marine Phytoplankton ◽  
Marine Biodiversity ◽  
Phytoplankton Species ◽  
Global Pattern ◽  
Phytoplankton Diversity ◽  
Biogeographic Patterns ◽  
Theoretical Predictions

Despite their importance to ocean productivity, global patterns of marine phytoplankton diversity remain poorly characterized. Although temperature is considered a key driver of general marine biodiversity, its specific role in phytoplankton diversity has remained unclear. We determined monthly phytoplankton species richness by using niche modeling and >540,000 global phytoplankton observations to predict biogeographic patterns of 536 phytoplankton species. Consistent with metabolic theory, phytoplankton richness in the tropics is about three times that in higher latitudes, with temperature being the most important driver. However, below 19°C, richness is lower than expected, with ~8°– 14°C waters (~35° to 60° latitude) showing the greatest divergence from theoretical predictions. Regions of reduced richness are characterized by maximal species turnover and environmental variability, suggesting that the latter reduces species richness directly, or through enhancing competitive exclusion. The nonmonotonic relationship between phytoplankton richness and temperature suggests unanticipated complexity in responses of marine biodiversity to ocean warming.

Diversity components and assembly patterns of plant functional traits determine community spatial stability under resource gradients in a desert steppe

2016 ◽  
Vol 38 (5) ◽  
pp. 511 ◽  
Author(s):  
Zhao Na ◽  
Wang Zhengwen ◽  
Shao Xinqing ◽  
Wang Kun
Keyword(s):  
Species Richness ◽  
Functional Traits ◽  
Nutrient Availability ◽  
Functional Group ◽  
Group Composition ◽  
Functional Trait ◽  
Spatial Stability ◽  
Trait Diversity ◽  
The Relationship ◽  
Functional Trait Diversity

The diversity–stability relationship has been addressed and debated for decades, but how this relationship is affected by nutrient availability remains contentious. In the present study we assessed the effects of plant diversity, in terms of species richness, functional group composition and functional trait diversity, on the spatial stability of net primary productivity (NPP) following nitrogen and phosphorus application. In addition, we explored how functional traits at the species level contribute to the spatial stability of NPP. The results support the hypothesis that greater diversity leads to higher spatial stability. This relationship was highly dependent on soil nutrient availability, and increasing species richness or functional trait diversity significantly increased spatial variation of NPP under a high N fertilisation level. The effects of high mineral fertilisation rates may perhaps have masked the effects of plant diversity. Although species richness or functional trait diversity of the original and modified communities from which species with particular functional traits had been removed were significantly different, there were no differences in the coefficients of variation in the NPP of those communities. The lack of difference demonstrated that the relationship between spatial variability and biodiversity depended on the measure of diversity applied and that the functional group composition exerted a stronger effect than other diversity measures. Further analyses revealed that spatial stability of NPP was enhanced with increased diversity in vegetative plant height, rooting depth and the presence of legume, and diminished with diversity in the root system type and life cycle under some fertilisation treatments. The present study demonstrates that the relationship between biodiversity and ecosystem functioning is variable with different diversity, identity and environmental factors. Evaluating the contribution of particular traits to community stability will ultimately help us better understand the mechanisms underlying the diversity–stability relationship.

scholarly journals Conventional sampling methods severely underestimate phytoplankton species richness

2013 ◽  
Vol 36 (2) ◽  
pp. 334-343 ◽  
Author(s):  
Tamara Rodríguez-Ramos ◽  
María Dornelas ◽  
Emilio Marañón ◽  
Pedro Cermeño
Keyword(s):  
Species Richness ◽  
Sampling Methods ◽  
Phytoplankton Species

The influence of light and nutrient availability on herb layer species richness in oak-dominated forests in central Bohemia

Plant Ecology ◽  
2009 ◽  
Vol 205 (1) ◽  
pp. 57-75 ◽  
Author(s):  
Jeňýk Hofmeister ◽  
Jan Hošek ◽  
Martin Modrý ◽  
Jan Roleček
Keyword(s):  
Species Richness ◽  
Nutrient Availability ◽  
Herb Layer

scholarly journals Phycological and bacteriological assessment of drinking water in schools of Tanta city, Egypt

2021 ◽  
Author(s):  
Mostafa M. El-Sheekh ◽  
Mai M. Hamoud
Keyword(s):  
Species Richness ◽  
Tap Water ◽  
Algal Species ◽  
Pollution Index ◽  
Treatment Method ◽  
Coliform Bacteria ◽  
Water Type ◽  
Phytoplankton Species ◽  
Water Characteristics ◽  
City Schools

Abstract Frequent water analysis is required to discover pollutants, describe water characteristics, and create a database for the water type that must be cleansed and treated in order to generate healthy water and, as a result, determine the best treatment method. In this regard, the goal of this research is to evaluate the overall physicochemical, phycological, and bacteriological properties of tap water samples taken periodically from twelve different Tanta city schools. A total of fifty-seven algal species were identified throughout the investigation, 33 species belonging to Chlorophyta, 13 species to Bacillariophyta, and 11 species to Cyanophyta. Phytoplankton species richness and diversity were relatively stable in each school all year round. Chlorella, Cyclotella, Scenedesmus, which are organically pollution tolerant genera according to Palmer's pollution index, were observed in the present study. Throughout the research seasons, total and faecal coliform bacteria were positively correlated (r = 0.94) in all of the study area sites. The counts of pollution indicators were more in groundwater than treated water.

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