Species diversity index

This study utilized a non-destructive technique through quadrat sampling to identify and measure mangroves’ biodiversity and carbon stock. The allometric equation was applied to quantify the carbon stock and Shannon-Wiener diversity index to determine the biodiversity. Twelve species were identified from the 36 sampling plot with 10 × 10 meter.

12p dianmotminh02 03-05-2024 3 1   Download

The studies involving water bugs (Hemiptera) biodiversity and ecology are very few and have mainly focused on taxonomy. We conducted research and evaluation of diversity indexes of water bugs (Hemiptera) in different landscapes including forest habitats, agricultural lands, ponds, streams from 16 sampling sites in Bac Kan, Lao Cai, Ninh Binh and Ha Tinh provinces. As a result, a total of 43 species of 23 genera of 10 families were recorded.

14p dianmotminh02 03-05-2024 3 1   Download

This paper provides information about effect of elevation on plant diversity in Ba Vi National Park which has 3 types of natural forest and 2 types of artificial one. Plant composition is different among the elevation of Ba Vi National Park not only by number of plant species in general but also about high conservation value species.

7p vilarry 01-04-2024 4 1   Download

Phytoplankton species composition, abundance, biodiversity indices and their influence by environmental conditions were examined in Thi Nai lagoon using data from four surveys in 2004, 2008, 2009 and 2020. A total of 367 taxa of phytoplankton belonging to ten groups was recorded, of which diatoms were dominant with over 60% of the total species.

20p vicaptainmarvel 21-04-2023 6 2   Download

Genome size, i.e. the total amount of DNA in an unreplicated somatic nucleus is considered an important character in the biology of organisms, and it is especially relevant for land plants given the extraordinary diversity reported. Despite the continuous growth of data and the efforts aimed at increasing our understanding of plant genome size diversity, more data are needed to have an evenly representation across lineages.

8p lyhuyenthu 31-01-2023 6 2   Download

In order to compare species compositions of ostracods, 25 streams and 15 lakes were sampled in the spring, summer, and autumn seasons of 2018. A total of 26 ostracod species were found in lakes (18 spp.) and streams (12 spp.). The Shannon index (H’) and evenness values of streams were higher than in lakes in all seasons. The highest H’ values for all combined (lakes + streams) and lake data were reported in the autumn season, and in spring the highest values were in streams.

13p dolomite36 30-12-2021 7 0   Download

Medicago ciliaris (L.) Krock and Medicago intertexta (L.) Mill are most often found in saline regions and are considered as potential resources for genes related to salinity resistance. To explore the genetic diversity of these two species by mean of nrSSR (simplesequence repeats) markers, 11 accessions originated from different regions in north of Africa and Middle East were chosen. Ten among 14 markers turned out to be polymorphic and gave 72 alleles. Eight markers were very informative with PIC values > 0.5, and three of them were found to be nonneutral.

12p tudichquannguyet 29-11-2021 7 1   Download

This study evaluated the phytoplankton communities based on functional groups to obtain information about the water quality of Lake İznik, Turkey. The phytoplankton consisted of 103 taxa, classified in 12 phytoplankton functional groups (PFGs), with dominancy of 5 species, Chrysosporum ovalisporum, Dolichospermum mendotae, Planktothrix rubescens, Fragilaria capucina, and Mougeotia sp. The Shannon–Wiener diversity index (H’) was calculated and results ranged between 0.41 and 2.47.

14p tudichquannguyet 29-11-2021 9 1   Download

In the present study a total of 2822 specimens of 25 species of mosquitoes belonging to 6 genera viz., Anopheles, Culex, Aedes, Armigeres, Toxorhynchites and Uranotaenia from distt Dehradun between January 2019 to December 2020 were recovered.

7p trinhthamhodang11 27-04-2021 8 1   Download

Soil microflora and their diversity study are now modern trends to know the proper soil health. Greater diversity of fungi in soil indicates better health of soil. In this experiment agricultural soil, barren land and garden soil were taken for their micromycoflora study and the diversity of microfungi were analysed by Simpson index and compared among the three types of soil. Total 563 colonies were isolated from the 38 soil samples collected from three different ecosystem types. Sixty eight (68) different species belonging to 31 genera were recorded.

10p angicungduoc8 07-11-2020 11 2   Download

Using molecular markers one can examine genetic diversity of species, cultivars, lines and forms of sunflower, identify genotypes, systematize collection material, classify heterosis groups and construct genetic maps. Fourteen parental genotypes of sunflower viz.,CMS-2A, CMS-821A, CMS-850A, R-10-46-2A, CMS-A4, CMS-A6, CMS-A10, R-GM-39, R-GM-41, R-GM-49, R-GM-69, 83-Br, R-393 and R2F01120B were analyzed for genetic diversity using 15 RAPD and 44 SSR primers. The genetic similarity index computed considering pooled data of SSR and RAPD markers showed very wide range from 0.18 to 0.

8p chauchaungayxua8 03-10-2020 15 2   Download

Review study showed that CTPTR-CTW and ZTDSR-ZTW (RRRW) record the highest seed bank (SB) of grasses, sedges and BLWs as total weeds, in general; and predominant weeds i.e., Echinochloa spp., Ammania baccifera, Commelina benghalensis and Digitaria sanguinalis, in particular. It also showed the higher species richness (DMg) and Shannon–Weaver (H’) indices. CTDSRCTW and CTDSR-ZTW (RRR) show the lowest WSB and at par with Shannon–Weaver (H’) index; further, lowest species richness (DMg) under CTDSR-CTW.

15p caygaocaolon7 18-09-2020 11 2   Download

Understanding the genetic variability and diversity of a crops species provides opportunity for plant breeders to develop new and improved cultivars having both farmer-preferred and breeder-preferred traits. In the present study 11 morphological characters and 16 quantitative characters were recorded from 27 advance breeding lines/varieties to identify useful alleles for future breeding. Genotypes varied considerably in plant growth and morphological characters. The overall mean of ShannonWiener diversity index (H’) value was 0.

21p angicungduoc6 22-07-2020 6 1   Download

Our study investigated 12 study sites in four main islands of Tho Chu archipelago in 2019. Six Sargassum species were recorded for the flora of Tho Chu Archipelago, viz.Sargassum aquifolium (Turner) C.Agardh, Sargassum feldmannii Pham-Hoang Ho, Sargassum ilicifolium (Turner) C.Agardh, Sargassum mcclurei Setchell, Sargassum oligocystum Montagne, Sargassum polycystum C.Agardh, among which three species, namely Sargassum oligocystum Montagne, Sargassum feldmannii Pham-Hoang Ho and Sargassum mcclurei Setchell were newly recorded for Vietnam.

8p xilank_of 22-07-2020 22 2   Download

The study aimed to evaluate water quality at Bung Binh Thien Reservoir, in An Giang Province, Viet Nam using Shannon-Wiener species diversity index (H’) and associated average score per taxon (ASPT) calculated from composition of phytoplankton and zoobenthos.

12p vitsunade2711 02-06-2020 14 1   Download

Six different A. catechu bearing forest types including one plantation of A. catechu were selected for phytosociological studies in the Western Himalayan region of India. 72 sample plots of 0.1ha were selected. The plant genetic spectrum was made up of 75 genera with 86 species belonging to 43 families. Vegetational analysis revealed that in Dry Shiwalik Sal forest, the dominant tree species was Shorea robusta while in Northern Dry Mixed Deciduous forest, Dry Deciduous Scrub forest and Dry Riverine forest, the dominant tree species was Acacia catechu.

10p kethamoi4 16-04-2020 8 1   Download

Tomato is widely consumed vegetable in the world. It is used as raw and processed form. Tomato flowers are self as well as controlled pollinated. The crop has more than thirteen species including cultivated and wild types with huge diversity and is susceptible to diverse stress conditions. Recent advances in the biotic and abiotic stress in tomato transcriptomics have been reviewed here. Transcriptome is a particular set of RNA expressed during a stress, developmental stages or a condition in a group of cells.

31p caygaocaolon4 04-04-2020 11 1   Download

Intensive pesticide application caused damaged of natural balance in agricultural land. Purpose of the study is to evaluate frequency of pesticides application and their impact presence of fungi at local shallot plants in Oloboju village, Sigi Regency, Central Sulawesi. Almost all of local shallot farmers was used synthetic pesticides controlled pests and diseases with high, medium and low of their frequency applications.

9p cothumenhmong3 22-02-2020 29 0   Download

The present investigation was carried out to assess the distribution of zooplankton in seagrass ecosystem in comparison with that of the coastal waters without seagrasses in Gulf of Mannar. Water and plankton samples were collected from the seagrass ecosystem (Station 1) and the control station without seagrasses (station 2) from September 2016 to May 2017. The physico chemical parameters were analysed and the mean values of surface water temperature, salinity, pH, dissolved oxygen, nitrite, nitrate, phosphate, silicate, gross primary productivity and chlorophyll-a were 27.72⁰ C, 34.

9p trinhthamhodang3 22-02-2020 14 0   Download

Cultivated species of jute (Corchorus olitorius L. and Corchorus capsularis L.) are distinct in their growth and characteristics related to dry matter and fibre yield. The present study was planned to evaluate 77 varieties of jute including two checks, each of C. capsularis and C. olitorius. Characterizations of genotypes of both the species were also carried out on the basis of five marketable traits with their correlation and cluster analysis of them to study the diversity pattern, based on these characters.

10p nguaconbaynhay3 07-02-2020 23 0   Download