Analysis on Phytoplankton Community Diversity in Xingkai Lake

2015 ◽  
Vol 1092-1093 ◽  
pp. 655-661
Author(s):  
Shi Bo Liu ◽  
Xu Shen Zhou ◽  
Xian Zhi Meng ◽  
Jing Bo Zhang ◽  
Chao Lin
Keyword(s):  
Water Pollution ◽  
Cell Density ◽  
Dominant Species ◽  
Phytoplankton Community ◽  
Wiener Index ◽  
Community Diversity ◽  
Margalef Index ◽  
Lake Center ◽  
Heavy Pollution

The phytoplankton community were investigated at Xingkai Lake in July and August 2011. The results showed that there were 31 species belonging to 5 phylum of phytoplankton in Xingkai Lake. In the detect, 10 species (32.29%) of Cholorophyta was found. Cell density in Dangbi town and Lake center was 1.592×106ind./L and 1.562×106ind./L respectively. Cell density of Cyanophyta was the highest, and the dominant species were Merismopedia tenuissim, Anabaena sphaerica and Phormidium anomala . Shannon-Wiener index of samples in the two places were 2.85 and 2.86 respectively, and Margalef index were 1.59 and 1.27 respectively. It showed that the type of water was mesosaprobic-heavy pollution type, and we should pay attention to the water pollution.

scholarly journals Phytoplankton Community of Taylor Creek in the Niger Delta Using Diversity Indices

2019 ◽  
Vol 1 (3) ◽  
pp. 1-12
Author(s):  
Emmanuel Nwabueze Ogamba ◽  
Embelemi Edure Charles ◽  
Sylvester Chibueze Izah
Keyword(s):  
Phytoplankton Community ◽  
Anthropogenic Activities ◽  
Wiener Index ◽  
Diversity Indices ◽  
Health Condition ◽  
Occurrence Rate ◽  
Significant Relationships ◽  
Taylor Creek ◽  
Heavy Pollution ◽  
Taxonomic Groups

This study evaluated the phytoplankton community of Taylor creek from Polaku to Agbia between November 2013 and July 2014. Sampling was carried out in 12 locations along the stretch of the creek following standard protocol. The phytoplankton enumeration was done and identified accordingly. In all the 12 locations, 100 species of phytoplankton belonging to 14 taxonomic groups including Bacillariophyta (31 species), Chlorophyta (25 species), Pyrrophyta (4 species), Cyanophyta (17 species), Spermatophyta (9 species), Euglenophyta (3 species), Phaeophyta (1 species), Heterokontophyta (2 species), Myxophyta (1 species), Xanthophyta (1 species), Chrysophyta (2 species), Lycopodiophyta (1 species), Cryptophyta (1 species), Dinophyta (2 species). Bacillariophyta, Chlorophyta, Cyanophyta and Spermatophyta with occurrence rate of 36%, 34%, 10% and 10%, respectively were the predominant phytoplankton in the study area occurring in all the locations across the period of the study. The various species have some distinct environmental condition that enable them thrive in their niche, and this determines the structure of the phytoplankton in the study area. The diversity indices provided information about the distribution and health condition of the creek. The study showed significant relationships between Shannon-Wiener, Menhinick, Margalef, equitability and Fisher-alpha indices. The ecosystem showed moderate to heavy pollution based on Shannon Wiener index. There is the need for improved method of waste disposal and other anthropogenic activities being carried in and/ or within the creek.

Seasonal Dynamics of Algal Biodiversity and Water Quality Assessment of Jiangsu Shilianghe Reservoir in China

2013 ◽  
Vol 807-809 ◽  
pp. 61-65
Author(s):  
Yuan Gao
Keyword(s):  
Water Quality ◽  
Species Diversity ◽  
Cell Density ◽  
Seasonal Dynamics ◽  
Algal Cell ◽  
Water Quality Assessment ◽  
Wiener Index ◽  
Biological Indicators ◽  
Sand Mining ◽  
Rivers And Lakes

Analysis of 4 sampling surveys on Jiangsu Shilianghe reservoir in May, July and October of 2011 and January of 2012, 109 species of algae belonging to 7 divisions were totally identified. The green algae and diatoms were the main species while Euglena and Cryptomonas were rare. The algal cell density in each season was compared as follows: summer (63.77 × 1000000 / L) > autumn (61.87 ×1000000 / L) > spring (43.31 ×1000000 / L) > winter (37.922 ×1000000 / L). Algae Shannon-Wiener index and Pielou indexes of each season were compared and described as follows: summer (2.71, 0.41) > winter (2.09, 0.32) > autumn (2.05, 0.31) > spring (1.85, 0.28). The Margalef indexes of each season were compared as follows: summer (1.51) > spring (1.38) > autumn (1.19) > winter (0.86). The water quality was assessed as α-medium pollution according to biological indicators. Sand mining, cages and obstruction between rivers and lakes may be the main reasons that lead to high algal cell density and low index of species diversity.

Phytoplankton community diversity along a river-estuary continuum

2014 ◽  
Vol 69 (2) ◽  
pp. 107-116 ◽  
Author(s):  
Tatenda Dalu ◽  
P. William Froneman ◽  
Nicole B. Richoux
Keyword(s):  
Phytoplankton Community ◽  
River Estuary ◽  
Community Diversity

scholarly journals Keanekaragaman Coccinellidae Predator Pada Beberapa Ekosistem Perkebunan di Kabupaten Dharmasraya

2019 ◽  
Vol 10 (2) ◽  
pp. 157-168
Author(s):  
Siska Chiko Efendi ◽  
Yaherwandi Yaherwandi ◽  
Ade Noferta ◽  
Aditya Muhammad
Keyword(s):  
Species Diversity ◽  
Dominant Species ◽  
Wiener Index ◽  
Simpson Index ◽  
Importance Value Index ◽  
Importance Value ◽  
Important Value Index ◽  
Sweep Net ◽  
Species Importance

The objectives of this research were to study the species diversity and to determine the dominant species of lady bird beetle predators in high land plantation ecosystem in West Sumatera. The samples were taken by hand collection and sweep net. The data of species diversity were analyzed using Shannon-Wiener index, evenness of species were analyzed by Simpson index, and  dominant species using important value index. The results showed that there were 91 individuals predator found which consisted of 7 species. The highest  species diversity (1.74) and evenness (0.89) were found in Pulau Punjung. The lowest diversity and evennes (1,40) and (0,75) was found in Koto Besar. The highest  species importance value index was 1,00, that was Menochillus sexmaculatus.

scholarly journals Effect of four pre-planted cover crop species on weed control and population dynamics

2020 ◽  
Vol 15 (3) ◽  
pp. 253-260
Author(s):  
Mohammad Reza Majidi ◽  
Bahram Mirshekari ◽  
Batoul Samedani ◽  
Farhad Farahvash ◽  
Hassan Hajnajari
Keyword(s):  
Population Dynamics ◽  
Active Ingredient ◽  
Cover Crop ◽  
Dry Weight ◽  
Wiener Index ◽  
Festuca Rubra ◽  
Crop Species ◽  
Festuca Ovina ◽  
Margalef Index ◽  
Herbicide Concentration

The present research was conducted to assess the competition of four cover crop species including the Festuca ovina L., Festuca rubra L., Agropyron desertorum (Fischer ex Link) Shultes, and Bromus tomentellus Boiss with the weeds as well as enhancement of their establishment. B. tomentellus with 7.7 and 8.73 t h–1 had the highest dry weight production in 2016 and 2017, respectively. In 2016, the highest reduction in the dry weight of the weeds (73%) was observed for the F. ovina, at the rate of 600 g active ingredient per ha–1 of herbicide. In 2017, the highest reduction in the dry weight of the weeds (90%) was recorded at the rate of 600 g active ingredient per ha–1 of herbicide for the. Dry weight of the dominant weeds decreased by 70% approximately with the and at the rate of 600 g active ingredient per ha–1 of herbicide. Shannon Wiener index decreased in all the treatments following the increase in the herbicide concentrations in 2016 and 2017. The interaction of cover crop species and herbicide on the Margalef index was significant in all the treatments in 2016 except for A. desertorum, as well as A. desertorum and in 2017. Margalef index reduced following the increase in the herbicide concentration in all the treatments.   Highlights - Bromus tomentellus Bioss and Festuca ovina L had the highest biomass production. - Bromus tomentellus (90%) and Festuca ovina (73%) treatments had the highest decrease in total weed dry weight compared to control. - The highest reduction in dry weight of total dominant weeds was influenced by B. tomentellus and Festuca ovina 73% and 83% at the rate of 600 g a.i. ha–1 of Bromocide M.A. EC respectively. - Margalof index reduced following the increase in herbicide concentration in all treatments. - Bromus tomentellus, Festuca ovina has the potential for reducing weeds in orchards and croplands.

Studies on Community Diversity of Spore-Forming bacteria at Soil of Swamping Wetland in WuLiangSuHai

2014 ◽  
Vol 955-959 ◽  
pp. 3548-3551
Author(s):  
Yu Qin Shao ◽  
Ji Zhao ◽  
Wei Wei Cao ◽  
Jia Yin Lu ◽  
Jing Yu Li
Keyword(s):  
Diversity Index ◽  
Wiener Index ◽  
Community Diversity ◽  
Plate Count ◽  
Simpson Index ◽  
Count Method ◽  
Plate Count Method ◽  
Spore Forming Bacteria ◽  
Index Of Diversity

This study used plate count method to analyze the composition of the Spore-forming bacteria community in the soil in swamping wetland, alkaline land, and desert belt, all of which grow in the upstream, midstream and downstream of swamping wetland of Wuliangsuhai. In this process, the Shannon-Wiener index, Simpson index were used to analyze the index of diversity (H), the index of evenness (J), the index of richness (R) and the index of dominance (D) of the Spore-forming bacteria community. The results showed that: the diversity index of in soil of the swamping wetland and desert belt was the highest in the midstream, second in the upstream, and lowest in the downstream; that in soil of the alkaline land was the highest in the midstream, second in the downstream and lowest in the upstream, and showed significant differences between in the midstream and downstream and in upstream; that in soil of the desert belt showed significant differences between in the upstream and downstream and in midstream; in the same area, in the desert belt soil of Spore-forming bacteria more than swamping wetland and alkaline land.

Microbiota associated with pollen, bee bread, larvae and adults of solitary bee Osmia cornuta (Hymenoptera: Megachilidae)

2015 ◽  
Vol 105 (4) ◽  
pp. 470-476 ◽  
Author(s):  
J. Lozo ◽  
T. Berić ◽  
A. Terzić-Vidojević ◽  
S. Stanković ◽  
D. Fira ◽  
...  
Keyword(s):  
Dominant Species ◽  
Alimentary Tract ◽  
Wiener Index ◽  
Solitary Bee ◽  
Simpson Index ◽  
Rdna Sequencing ◽  
Bee Bread ◽  
Species Specific ◽  
Bacterial Biodiversity ◽  
Different Sources

AbstractUsing cultivation-dependant method, we isolated 184 strains from fresh and old bee bread, pollen, larvae and adults of solitary bee Osmia cornuta. The 16S rDNA sequencing of 79 selected isolates gave the final species-specific identification of strains. Phylogenetic analysis indicated that microbiota isolated from five different sources were represented with 29 species within three different phyla, Firmicutes with 25 species, Actinobacteria with only one species and Proteobacteria with three species of Enterobacteriaceae. Bacterial biodiversity presented with Shannon–Wiener index (H′) was highest in the alimentary tract of adults and old bee bread (H′ = 2.43 and H′ = 2.53, respectively) and in the same time no dominance of any species was scored. On the contrary, results obtained for Simpson index (D) showed that in pollen samples the dominant species was Pantoea agglomerans (D = 0.42) while in fresh bee bread that was Staphylococcus sp. (D = 0.27). We assume that microbial diversity detected in the tested samples of solitary bee O. cornuta probably come from environment.

scholarly journals Nectar-living yeasts of a tropical host plant community: diversity and effects on community-wide floral nectar traits

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3517 ◽  
Author(s):  
Azucena Canto ◽  
Carlos M. Herrera ◽  
Rosalina Rodriguez
Keyword(s):  
Yeast Cell ◽  
Host Plant ◽  
Cell Density ◽  
Plant Community ◽  
Host Plants ◽  
Common Species ◽  
Life Forms ◽  
Community Diversity ◽  
Floral Nectar ◽  
Key Factor

We characterize the diversity of nectar-living yeasts of a tropical host plant community at different hierarchical sampling levels, measure the associations between yeasts and nectariferous plants, and measure the effect of yeasts on nectar traits. Using a series of hierarchically nested sampling units, we extracted nectar from an assemblage of host plants that were representative of the diversity of life forms, flower shapes, and pollinator types in the tropical area of Yucatan, Mexico. Yeasts were isolated from single nectar samples; their DNA was identified, the yeast cell density was estimated, and the sugar composition and concentration of nectar were quantified using HPLC. In contrast to previous studies from temperate regions, the diversity of nectar-living yeasts in the plant community was characterized by a relatively high number of equally common species with low dominance. Analyses predict highly diverse nectar yeast communities in a relatively narrow range of tropical vegetation, suggesting that the diversity of yeasts will increase as the number of sampling units increases at the level of the species, genera, and botanical families of the hosts. Significant associations between specific yeast species and host plants were also detected; the interaction between yeasts and host plants impacted the effect of yeast cell density on nectar sugars. This study provides an overall picture of the diversity of nectar-living yeasts in tropical host plants and suggests that the key factor that affects the community-wide patterns of nectar traits is not nectar chemistry, but rather the type of yeasts interacting with host plants.

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