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Journal articles on the topic 'Shannon-Weaver index diversity'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Dagaonkar, Amita, and M. M. Prakash. "Diversity indices of phytoplankton at Munj sagar talab (Dhar, Madhya pradesh, India)." Environment Conservation Journal 12, no. 3 (2011): 29–32. http://dx.doi.org/10.36953/ecj.2011.120306.

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Phytoplankton is the significant formal natural occupier of all water bodies. They play an important role in the biosynthesis of organic material. Being an index of trophic status phytoplankton reflects the overall environmental condition of the system and its potentiality. Present investigation was carried out for a period of twenty four month to study the diversity indices. Simpson’s Index of Dominance ranged from 0.0441 to 0.0952. Shannon-Wiener Diversity (H) index ranged from 2.6298 to 3.2112.273. Evenness Index ranged from 0.5593 to 0.9808 during the study period. Keywords: Diversity inde

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Tomar, V., and W. Ahmad. "Food web diagnostics and functional diversity of soil inhabiting nematodes in a natural woodland." Helminthologia 46, no. 3 (2009): 183–89. http://dx.doi.org/10.2478/s11687-009-0034-7.

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AbstractFunctional diversity and detritus soil food web of soil inhabiting nematodes in natural woodland dominated by Acacia nilotica L. was studied. Functional diversity was studied in terms of trophic groups assessed by Trophic diversity index (TDI) and Shannon-Weaver index (H′), while food web was diagnosed by channel index (CI). The plant parasitic channel was determined by plant parasitic index (PPI). The stability of the soil ecosystem was measured in terms of maturity index (MI), structure index (SI) and enrichment index (EI). Shannon-Weaver index of the area was recorded as 2.1 ± 0.3 w

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Kratyuk, O. "Study of forest plants species diversity in “Radomyshlske” forestry-hunting enterpise." Agrobìologìâ, no. 2(174) (December 27, 2022): 111–18. http://dx.doi.org/10.33245/2310-9270-2022-174-2-111-118.

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The types of plant diversity on the territory of the Radomyshl Forestry in areas with different types of forest vegetation conditions were investigated. 21 species belonging to 15 families and 18 genera have been identified. The main types of forest are determined (Pinus sylvestris-Vaccinium vitisidaea+V. myrtillus-Cladonia spp.+ Pleurozium; Pinus sylvestris-Calluna vulgaris-Pleurozium+ Cladonia ssp.; Pinus sylvestris-Vaccinium myrtillus-Pleurozium; Pinus sylvestris-Pteridium aquilinum-Vaccinium myrtillus-Pleurozium; Pinus sylvestris-Calamagrostis arundinacea+Convallaria majalis) and key indic

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Saifullah, Saifullah. "Water Quality of Situ Cibanten Based on Shannon-Weaver Diversity Index Value." Jurnal Perikanan dan Kelautan 5, no. 1 (2015): 1. http://dx.doi.org/10.33512/jpk.v5i1.263.

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Zanklan, Ahissou Séraphin. "Phenotypic Variation and Genetic Diversity of Colocynth (Citrullus colocynthis [L.] Schrad.) Varieties Collected in the Southeastern of Benin Republic." Middle-East Journal of Scientific Research 32, no. 1 (2024): 1–19. http://dx.doi.org/10.5829/idosi.mejsr.2024.01.19.

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Citrullus colocynthis belongs to the plant family Cucurbitaceae. Despite its nutritional importance for human beings, it is less promoted. The present study aims to explore the phenotypic variation and genetic diversity existing in the crop, to examine its breeding potential and to identify useful characters to distinguish between genotypes. 40 provenances collected from farmers in the Southeastern of Benin Republic were multiplied during the growing season 2013-2014. They were surveyed in field trials at three locations (each year) and three years (2014-2017). 20 quantitative and 14 qualitati

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Khadka, C. B., A. L. Hammet, A. Singh, M. K. Balla, and Y. P. Timilsina. "Ecological status and diversity indices of Panchaule (Dactylorhiza hatagirea) and its associates in Lete village of Mustang district, Nepal." Banko Janakari 26, no. 1 (2016): 45–52. http://dx.doi.org/10.3126/banko.v26i1.15501.

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This paper focuses on the ecological status and diversity indices: Simson’s Index (C), Simson’s Index of Dominance (D) and Shannon-Weaver Index (H) of Dactylorhiza hatagirea and its associates- Rheum australe and Rumex nepalensis in Lete village of Mustang District within the Annapurna Conservation Area. The study was conducted during the monsoon season (June/July) of 2013 in the Lete VDC of Mustang District. The study site possessed an area of 4.5 ha. Altogether, 100 circular plots, each with 25 m2 area, were laid out purposively within the study area; the sampling intensity being 5.55%. The

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Benarchid, Khalid, Mohammed Khatori, and Said Hilali. "Evaluation De La Dégradation De La Chamaeropaie Du Versant Sud Du Mont « jbelLakraa » (Maroc) Etudes Floristique Et Morphométrique." European Scientific Journal, ESJ 14, no. 14 (2018): 76. http://dx.doi.org/10.19044/esj.2018.v14n14p76.

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Our study is devoted to the chamaeropaie degradation assessment of the jbel Lakraa southern slope, located in the northern Middle Atlas in the Ribat Al Khair region. The floristic study revealed a specific richness of 124 species belonging to 95 genera and 33 vascular plants families, as well as a specific diversity relatively high with a Shannon-Weaver index of 3.88. A relatively high specific diversity with a Shannon-Weaver index of 3.88 was observed. However, the floristic composition showed a disturbance expressed by the index of equitability which is 0.58 and a strong therophytisation of

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Sherwin, William B., and Narcis Prat i Fornells. "The Introduction of Entropy and Information Methods to Ecology by Ramon Margalef." Entropy 21, no. 8 (2019): 794. http://dx.doi.org/10.3390/e21080794.

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In ecology and evolution, entropic methods are now used widely and increasingly frequently. Their use can be traced back to Ramon Margalef’s first attempt 70 years ago to use log-series to quantify ecological diversity, including searching for ecologically meaningful groupings within a large assemblage, which we now call the gamma level. The same year, Shannon and Weaver published a generally accessible form of Shannon’s work on information theory, including the measure that we now call Shannon–Wiener entropy. Margalef seized on that measure and soon proposed that ecologists should use the Sha

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Wang, Hong Wei, Wei Zhang, Kai Ming Li, et al. "A Phytoplanktonic Investigation and Water Quality Assessment about Tanjiang River." Applied Mechanics and Materials 130-134 (October 2011): 3795–98. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.3795.

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A phytoplanktonic investigation of Tanjiang River was conducted in March 2011. 202 species of phytoplankton belonging to 86 genera and 7 phyla were identified altogether. Chlorphyta and Bacillariophyta which occupied 36.14% and 43.56% of the total number were the most, indicating that the green algae and diatom were the dominant group. Tanjiang River was β-meso-polluted to oligo-polluted judging from phytoplankton community while it was clean or light-polluted judging from Shannon-Weaver diversity index, Margalef diversity index and Pielou evenness index. Tanjiang River was light-polluted or o

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10

Singh, Anil Kumar, Manibhushan, Naresh Chandra, and Narayan Bhakta. "Extent and pattern of diversity in saffron germplasm of Indian Kashmir." Bangladesh Journal of Botany 44, no. 4 (2018): 635–42. http://dx.doi.org/10.3329/bjb.v44i4.38635.

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Keeping in view the dearth of well-defined saffron germplasm, an exploration trip was conducted to collect saffron germplasm from the growing tracts of Kashmir valley. A total of 28 diverse accessions were collected and evaluated. Data recorded was subjected to basic statistical analysis viz., minimum, maximum, mean and coefficient of variance as well as Shannon-Weaver Diversity Index (SDI) was also worked out. Correlation study was done to know the extent and pattern of contribution among the traits and saffron yield. An attempt was made to quantify the extent of diversity present among the a

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Bonvillani, Adriana Gloria, Miguel Angel Di Renzo, and Iván Nicolás Tiranti. "Genetic polymorphism of milk protein loci in Argentinian Holstein cattle." Genetics and Molecular Biology 23, no. 4 (2000): 819–23. http://dx.doi.org/10.1590/s1415-47572000000400019.

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Some alleles of milk protein loci are associated with superior cheese production characteristics. The genetic polymorphism of the milk protein loci alphas1-casein, beta-casein, k-casein and beta-lactoglobulin was examined in Argentinian Holstein cattle. Samples from 12 herds of four regions of Córdoba were analyzed by starch gel electrophoresis. The chi² test was used to assess whether the populations were in Hardy-Weinberg equilibrium. Genotypic diversity was analyzed by the Shannon-Weaver index. The observed genotypic frequencies were analyzed by Hedrick's genetic identity and the genetic di

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Madjaoui, Samia, Asmaa Hedeili, Warda Taibi, and Semir Bechir Suheil Gaouar. "Study of the phenotypic variation of some accessions of beans (vicia faba.l) in the wilaya of Tlemcen." GABJ 2, no. 2 (2018): 26–32. http://dx.doi.org/10.46325/gabj.v2i2.120.

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The aim of this study was the morphometric characterization of 8 bean accessions (vicia faba L) in different localities in the wilaya of Tlemcen, we studied 8 agromorphological characters, were the objects of a statistical study by the software R. Phenotypic diversity was determined by the Shannon-Weaver diversity index (H ') at different levels. The estimated H showed high phenotypic variability for different traits with an average H of 0.63. The results of the Multiple Correspondence Analysis (PCA) and the Hierarchical Classification (CAH) showed a clear distinction between the accessions.

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Naveen, Kumar, and Kumar Meena Mukesh. "Biodiversity Analysis of Herbaceous Flora in Ramgarh Shekhawati Beed, Rajasthan." International Journal on Science and Technology 16, no. 1 (2025): 1–10. https://doi.org/10.5281/zenodo.14904307.

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This study investigates the herbaceous diversity of the Ramgarh Beed area in the Shekhawati region of Rajasthan, using the quadrat method from 2018 to 2022. A total of 120 herbaceous species were recorded and analyzed for species density, frequency, abundance and ecological indices. Argemonemexicana exhibited the highest density (4.2) and abundance (4.67), while Crotalaria medicaginea showed the lowest density (0.1). The Shannon-Weaver diversity index (H') was 4.61, indicating moderate biodiversity, with a Simpson dominance index (D) of 0.011 and species evenness (e) of 0.962. The findings hig

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Milana, Giuliano, Luca Luiselli, and Giovanni Amori. "Forty years of dietary studies on barn owl (Tyto alba) reveal long term trends in diversity metrics of small mammal prey." Animal Biology 68, no. 2 (2018): 129–46. http://dx.doi.org/10.1163/15707563-17000095.

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AbstractThe diet of predators is influenced by local conditions (e.g., characteristics of habitat and microhabitat, seasonality, prey availability) and therefore tends to change across time. In this paper, the diet composition of the barn owl (Tyto alba) in Italy was studied using a meta-analysis of 47 articles (covering 212 independent sites, with multiple surveys for some sites, thus giving a total of 290 datasets) between 1972 and 2012. General Linear Models were used to assess the effects of year and study site on four distinct diversity indices (species richness, dominance, Shannon-Weaver

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ZAMORA GONZÁLEZ, HILLDIER. "Freshwater macroinvertebrates registered during the rainy season in three tropical rivers of the foothill on the eastern plains of Colombia." Revista Colombiana de Ciencia Animal - RECIA 7, no. 2 (2015): 139. http://dx.doi.org/10.24188/recia.v7.n2.2015.243.

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This study was carried out in three tropical rivers, namely Humadea (488m. above sea level), Marayal (503m. asl) and Camoa (450m. asl), located in the foothill on the Eastern Plains of Colombia, with average temperature as high as 24ºC, and 4000mm average annual precipitation. The samplings were carried in rainy seasons during 2003 to 2007 to date. During the field survey stage, hydro physicochemical indices were obtained and analyzed, and the Acuatic Macroinvertebrates Epicontinental (AME) were captured. Based on laboratory survey and sampling work Shannon- Weaver (H’), Sorensen (s) and BMWP

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16

‘Akla, Cut M. N., Fitra Wira Hadinata, Nur Ikhsan, et al. "Gastropoda Laut dan Chiton di Mikrohabitat Bangunan Pelindung Pantai Pelabuhan Krueng Geukueh Provinsi Aceh." Jurnal Kelautan Tropis 25, no. 3 (2022): 345–57. http://dx.doi.org/10.14710/jkt.v25i3.14950.

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The study was carried out in March 2022 at 8 observation stations in the Krueng Geukueh Harbor coastal protection facility in Aceh Province, using the visual encounter method for 120 minutes. The Shannon-Weaver diversity index, Simpson dominance, and Shannon-Weaver uniformity were used to generate the gastropod ecology index, while PCA was used to examine dominance by specific species and CA was used to analyze similarities in species composition. The study's findings included 20 species, 7 families, and a group of chitons. Gastropods Littorina angulifera, Echinolittorina puncatata, Nerita cha

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Sharma, R. C., N. K. Chaudhary, B. Ojha, L. Yadav, M. P. Pandey, and S. M. Shrestha. "Variation in rice landraces adapted to the lowlands and hills in Nepal." Plant Genetic Resources: Characterization and Utilization 5, no. 03 (2007): 120–27. http://dx.doi.org/10.1017/s1479262107837828.

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The landraces of rice (Oryza sativaL.) possess wide diversity, which needs to be properly characterized for their use in genetic improvement. Replicated field studies were conducted in 1998, 1999 and 2000 at two sites in Nepal to determine diversity in 183 landraces of rice adapted to the lowlands and the hills in Nepal. Fourteen improved genotypes were also used for comparison. Thirteen agronomic traits were investigated. Shannon–Weaver diversity index (H) and Simpson's index of diversity (D) were estimated to determine the level of genetic richness among the landraces. The landraces differed

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18

Bourouh, LN, N. Souilah, M. Boulacel, H. Bendif, G. Chaib, and T. Hazmoune. "Study on the Diversity of Genotypic Varieties of Durum Wheat (Triticum Durum Desf.) In the Sub-Humid Region of El Harrouch, Algeria." Journal of Biodiversity Conservation and Bioresource Management 9, no. 1 (2023): 41–60. http://dx.doi.org/10.3329/jbcbm.v9i1.66631.

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The study on the yield parameters and the morpho-biometric characterization of twenty genotypic varieties of durum wheat (Triticum durum Desf.) was carried out in the sub-humid region of El Harrouch of Algeria. A descriptive sheet according to the recommendations of UPOV (2014-2017) and the calculation of the Shannon and Weaver diversity index was prepared with 27 qualitative characters and one quantitative character relating to the different parts of the ear. The yield parameters, such as number of plants/m2, herbaceous tillers, ear tillers, number of ears/m2, number of grains/ear, weight of

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Kamrul Hasan, Shabnam Sabiha, AM Saleh Reza, Kazi Mehenaz Meherin, and Al Amin. "Computational study of Richness and Diversity Indices of fish species in rivers and other wetland areas and fish marketplaces under Kurigram District, Banglades." World Journal of Advanced Research and Reviews 12, no. 3 (2021): 434–57. http://dx.doi.org/10.30574/wjarr.2021.12.3.0726.

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The present study revealed that a total of 101 indigenous species of large fish (28 species) and Small Indigenous fish (73 species) belonging to 63 genera and 31 families were observed and identified while 17 exotic fish species were found under 5 families. Among the indigenous species, the highest number of species were found in family Cyprinidae and Bagridae with a relative diversity of 28.28% and 11.11%. In case of group species richness, highest number 27 fish species were found in catfish group followed by 12 species of carp, 8 species of each barbs and minnows, 6 species of eel fish, 8 s

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Fernandes, Camila Junqueira, Marcos Vieira Ferraz, Renata Gimenes, Suzana Targanski Sajovic Pereira, and Kathia Fernandes Lopes Pivetta. "Trees description in the main square of São José do Rio Preto, São Paulo State, Brazil." Ornamental Horticulture 24, no. 4 (2018): 334–40. http://dx.doi.org/10.14295/oh.v24i4.1151.

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The knowledge of the flora existing in the cities is of great importance from the ecological and sustainable point of view, as well as being a premise for actions that provide greater safety, comfort and well-being for the population. The objective of this work was to perform an analysis of the composition, diversity and quality of the tree flora (trees and palms) existing in Rui Barbosa Square, São José do Rio Preto, São Paulo State. This square is considered the main place for its location, history and use, and is located in the central region, next to the Cathedral. The arboreal individuals

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Kamrul, Hasan, Sabiha Shabnam, Saleh Reza AM, Mehenaz Meherin Kazi, and Amin Al. "Computational study of Richness and Diversity Indices of fish species in rivers and other wetland areas and fish marketplaces under Kurigram District, Banglades." World Journal of Advanced Research and Reviews 12, no. 3 (2021): 434–57. https://doi.org/10.5281/zenodo.5808692.

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The present study revealed that a total of 101 indigenous species of large fish (28 species) and Small Indigenous fish (73 species) belonging to 63 genera and 31 families were observed and identified while 17 exotic fish species were found under 5 families. Among the indigenous species, the highest number of species were found in family Cyprinidae and Bagridae with a relative diversity of 28.28% and 11.11%. In case of group species richness, highest number 27 fish species were found in catfish group followed by 12 species of carp, 8 species of each barbs and minnows, 6 species of eel fish, 8 s

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Mirnenko, Eduard I. "Taxonomic diversity of phytoplankton of the Kalmius River and its reservoirs." Ecosystem Transformation 5, no. 2 (2022): 3–13. http://dx.doi.org/10.23859/estr-220204.

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The paper presents data on the taxonomic diversity of phytoplankton in the middle section of the Kalmius River and the reservoirs located on it. Floristic analysis showed the presence in the aquatic biocenosis of 291 species of algae and 162 intraspecific taxa belonging to 8 divisions, 18 classes, 42 orders, 66 families and 105 genera. The divisions Cyanophyta, Chlorophyta, and Bacillariophyta dominated in frequency of occurrence. The Shannon-Weaver index varied the most in the Starobeshevsk Reservoir. The Sorensen-Chekanovsky coefficient evidences the isolation of the phytoplankton algal flor

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Sarkar, Chandan, and Nimai Chandra Saha. "Seasonal Variation of Water Quality Parameters and Their Impact on Fish Biodiversity Indices of Hasadanga Beel: A Case Study." Current Research in Nutrition and Food Science Journal 16, no. 1 (2021): 07–17. http://dx.doi.org/10.12944/cwe.16.1.03.

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Fish diversity indices and their correlation with seasonal fluctuation of physicochemical parameters of Hasadanga beel was aimed to be studied. A three-year study on the relationship between the seasonal fluctuation of water quality parameters and fish biodiversity indices was conducted in Hasadanga Beel, a floodplain lake of Nadia district, West Bengal to measure the ecological health of the lake. Samples of water and fish species were collected at pre-monsoon, monsoon and post-monsoon period from 2015-2017 to estimate physicochemical parameters of water and fish biodiversity indices i.e. Sha

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Kerboub, Yamina, Amina Benarbia, Mohamed Adamou Djarbaoui, and Semir Bechir Suheil Gaouar. "MORPHOMETRIC CHARACTERIZATION OF SOME SPECIES OF BATS IN WESTERN ALGERIA." GABJ 1, no. 1 (2017): 71–80. http://dx.doi.org/10.46325/gabj.v1i1.90.

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Our research work is divided into two parts. The first is based on the identification of specimens captured in the study area and the second part consists in characterizing these animals morphometrically and applicat the bioinformatics tools for data processing obtained. During this original study, we contributed to the morphometric study (20 measurements) of two bat species from western Algeria (Rhinolophus ferrumquinum in the Wilaya of Tlemcen and Asellia tridensdans in the Wilaya of Bechar). The analysis of the diversity of the studied species was carried out starting from 20 parameters by

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Beganović, Sanela, Avdul Adrović, Halim Prcanović, and Mirnes Duraković. "Correlation Between Water Quality and the Diversity Index of the Bosna River in the Zenica Region (Bosnia and Herzegovina)." Transylvanian Review of Systematical and Ecological Research 25, no. 3 (2023): 1–12. http://dx.doi.org/10.2478/trser-2023-0016.

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Abstract Using the Shannon-Weaver index (H’), the link between the physical and chemical components of the biological component in the Bosnia River was examined. The results showed that pH and H’ had a strong link (rs = 0.59), while total nitrogen and H’ had a poor relationship (rs = 0.44), and COD-Cr had a weak relationship (rs = 0.34). KPK-Cr (I water class) had the lowest parameter concentrations, whereas electrical conductivity (IV-V water class) showed the highest. The values of the biological elements range from a poor 0.267 to a high state of 2.26.

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Brraich, Onkar, and Sunil Saini. "Phytoplankton Abundance and Species Diversity in Ranjit Sagar Wetland, Punjab (India)." Current World Environment 10, no. 1 (2015): 215–21. http://dx.doi.org/10.12944/cwe.10.1.25.

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Species diversity, dominance and abundance of the phytoplankton community of the Ranjit Sager Wetland were studied during June, 2012 to May, 2014 on monthly basis. The main aim was to provide information about overall phytoplankton diversity of this wetland. Phytoplankton samples were collected using phytoplankton net and preserved in 5% formaldehyde solution on the spot, then brought to the laboratory for further analysis. Algae belonging to Cyanophyceae, Chlorophyceae and Bacillariophyceae were recorded. The Bacillariophyceae was the most dominant group followed by the Chlorophyceae and Cyan

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Ramiandrisoa, Botovao A., Cyrille Maharombaka, and Hery L. T. Ranarijaona. "Inventaire et typologie floristique des milieux lentiques dans le district de Vohipeno." Madagascar Conservation & Development 16, no. 2s (2022): 48–51. http://dx.doi.org/10.4314/mcd.wetlands.7.

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L’écologie des macrophytes (plantes aquatiques visibles à l’œil nu) est peu étudiée à Madagascar. L’écosystème aquatique du district de Vohipeno (Région Vatovavy Fitovinany) n’a fait l’objet d’étude que pendant la période coloniale de 1921 à 1936. Les objectifs de cette étude sont d’améliorer la connaissance sur les macrophytes et d’établir une typologie floristique des zones humides malgaches. Au total, 43 espèces réparties entre 34 genres et 19 familles ont été recensées. Les valeurs de l’indice de Shannon Weaver ont montré une faible diversité mais une distribution hétérogène. L’analyse du

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Minu, M., M. J. Mathew, and Anitha Abraham. "Seasonal diversity, distribution and abundance of Araneae in the Thattekkad Bird Sanctuary, Kerala, India." ENTOMON 47, no. 3 (2022): 285–94. http://dx.doi.org/10.33307/entomon.v47i3.763.

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The aim of the present study was to analyze the diversity of spiders across various parts of the Thattekkad Bird Sanctuary, Kerala, a tropical, semi evergreen, low-land forest located between the tributaries of the Periyarriver. Survey of the spider fauna was carried out for a period of twelve months. In total, 3286 individuals were collected from the sanctuary, which consist of 89 species of spiders under 59 genera and 18 families. Araneidae was the most abundant family. The most abundant species was Hippasa agelenoides of Lycosidae family. Spiders belonging to six feeding guilds, i.e., orb -

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Yulinda, Feni, Tugiyono, Agus Setiawan, and Elly Lestari Rustiati. "EVALUATION OF WATER QUALITY IN ANIMAL FEED FACTORY ENVIRONMENT BASED ON PLANKTON AND BENTHOS BIOINDICATORS." Jurnal Ilmiah Biologi Eksperimen dan Keanekaragaman Hayati (J-BEKH) 8, no. 2 (2021): 18–23. http://dx.doi.org/10.23960/jbekh.v8i2.192.

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Water is a source of life that plays an important role for all living things. Rivers are one of the water sources that are vulnerable to pollution. This study aimed to evaluate the water quality of the Way Napal river based on the diversity of plankton and benthos. The research was conducted from November 2020 to March 2021. Sampling and analysis were performed by field technicians from the SEAMEO BIOTROP Environmental Laboratory. Plankton diversity was calculated using the Shannon Weaver diversity index. The results showed that the phytoplankton diversity index at AP-1, AP-2, and AP-3 locatio

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Stocker, GC, GL Unwin, and PW West. "Measures of Richness, Evenness and Diversity in Tropical Rainforest." Australian Journal of Botany 33, no. 2 (1985): 131. http://dx.doi.org/10.1071/bt9850131.

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The number of species represented in vegetation (its richness) and the way in which individuals are distributed amongst the species (its evenness) are often combined into a single index to represent both these characteristics (its diversity). Many different indices to represent richness, evenness and diversity have been proposed from time to time. The present work examines empirically the suitability, for ecological studies, of a number of these measures using data from tree species of tropical rainforest of north Queensland and Barro Colorado Island, Panama. It is found that all of the richne

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Senbahar, Ahmet Mert, Özlem Güleç, and Zafer Tosunoglu. "Species diversity and dominancy indexes in Izmir Bay (Aegean Sea) purse seine fishery." Ege Journal of Fisheries and Aquatic Sciences 37, no. 4 (2020): 353–56. http://dx.doi.org/10.12714/egejfas.37.4.05.

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To determine the diversity index values of species caught by purse seine, all samplings were carried out between September 2, 2017, and April 6, 2018 in Izmir Bay. As a result, a total of 17 fish species (Osteichthyes) belonging to 11 families and also 2 species from invertebrates (Cephalopoda and Arthropoda) were determined. Bony fishes and invertebrates consist of 99.9% and 0.1% of the total biomass, respectively. Sardina pilchardus was the most dominated species that occupied as 80.2% of the overall bony fishes followed by Engraulis encrasicolus (14.6%) and Sardinella aurita (1.5%). Diversi

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Tena Gashaw, Esayas, Firew Mekbib, and Amsalu Ayana. "Genetic Diversity among Sugarcane Genotypes Based on Qualitative Traits." Advances in Agriculture 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/8909506.

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The study was conducted during 2012/2013 at Wonji Sugar Estate, Ethiopia, to estimate the extent of morphological diversity among sugarcane germplasm based on 16 qualitative traits. Four hundred sugarcane genotypes grouped in 20 locations were considered. Phenotypic frequency distributions of the characters were analyzed and Shannon-Weaver diversity index (H′) was computed using the phenotypic frequencies. Results indicated that the variation inH′within locations was larger than the diversity observed between locations. The value ofH′for all sample genotypes ranged from 0.43 to 0.98 with a mea

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ANGGRINI, ELVIN AYU, ANDI NUR SAMSI, and IRNAYANTI BAHAR. "KEANEKARAGAMAN GASTROPODA DI SUNGAI TANANAN KELURAHAN ARALLE KABUPATEN MAMASA." SCIENCE : Jurnal Inovasi Pendidikan Matematika dan IPA 4, no. 4 (2024): 361–66. http://dx.doi.org/10.51878/science.v4i4.3498.

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This research was conducted to determine the condition of the river ecosystem based on the Gastropod diversity index value. The research was conducted at two stations. The data collection method is simple random sampling. Data analysis used the Shannon – Weaver diversity index (H'). The research results obtained five Gastropod species, namely Pila ampulacea., Pomacea canaliculata, Sulcospira testudinaria, Lymnaea rubiginosa, and Indoplanornis exustus. The highest number of gastropods was found at Station A, consisting of four species and four families. The species most commonly found at statio

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Añorve-Sanvicente, Laura, Alain Leprêtre, and Dominique Davoult. "Large-Scale Spatial Pattern of the Macrobenthic Diversity in the Eastern English Channel." Journal of the Marine Biological Association of the United Kingdom 76, no. 1 (1996): 153–60. http://dx.doi.org/10.1017/s0025315400029088.

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A description is provided of the large-scale spatial distribution of the diversity of the benthic macrofauna in the eastern English Channel. Data from the oceanographic cruises of the RCP (Recherche Coopérative sur Programme) Benthos de la Manche Research Programme were obtained during the summers of 1971 to 1975. A total of 707 samples were analysed.Diversity of each sample was measured by means of the species richness (i.e. the total number of species present), the Shannon-Weaver diversity index and Pielou's evenness index. Diversity values were plotted for all 707 oceanographic stations in

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Tsirilaza, Benjamin, Rabarison Guy Arthur Andriamirado, Jean Robertin Rasoloariniaina, Yves Mong Jean-Michel, and Rejo-Fienena Félicitée. "Diversité et Distribution du Peuplement Ichtyofaune dans l'Estuaire de Betsiboka, Nord-Ouest de Madagascar." European Scientific Journal, ESJ 20, no. 9 (2024): 162. http://dx.doi.org/10.19044/esj.2024.v20n9p162.

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L'estuaire de Betsiboka, situé sur la côte nord-ouest de Madagascar, est le plus grand écosystème estuarien du pays. L'article explore la diversité des poissons dans cet estuaire, mettant en lumière la distribution ichtyologique au sein de cet écosystème. La méthodologie adoptée comprend deux approches d'échantillonnage des poissons, à savoir le suivi des prises de la petite pêche et la pêche expérimentale. Les données ont été traitées à l'aide du logiciel R, et les indices écologiques tels que l'Indice de Shannon-Weaver, l'Indice d'Équitabilité de Piélou, l'Indice de Similarité de Jaccard, ai

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Panja, Atanu Kumar, Sonpal Vasavdutta, Meena Choudhary, et al. "Interaction of physico-chemical parameters with Shannon-Weaver Diversity Index based on phytoplankton diversity in coastal water of Diu, India." Marine Pollution Bulletin 190 (May 2023): 114839. http://dx.doi.org/10.1016/j.marpolbul.2023.114839.

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Maia, Lilianne Dos Santos, Maria Dalila Martins Leão, Marianne Gonçalves Barbosa, Suyanne Araújo De Souza, Cristiane Ramos Coutinho, and Patrik Luiz Pastori. "Entomofauna diversity in areas of Caatinga under forest management in the semi-arid region of Ceará." Comunicata Scientiae 10, no. 1 (2019): 10–20. http://dx.doi.org/10.14295/cs.v10i1.2422.

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The Caatinga is characterised by deciduous plant species. The practice in this ecosystem is the production of firewood which, when carried out with no technical criteria, contributes to a reduction in the biodiversity and degradation of the biome. Forest Management Planning has been approved by the Ministry of the Environment; a lower impact on the environment is expected, as there is still little information on the effect on biodiversity. The aim of this study was to evaluate the diversity of soil fauna in areas that adopt a Forest Management Plan. Five areas were selected that adopt Forest M

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Sid-Ali, Sadou, Sadoudi Ali-Ahmed Djamila, Metna Ali-Ahmed Fatiha, Ourrad Ouiza, and Slimani Said. "Diversity of Ants (Hymenoptera, Formicidae) in Two Forest Sites from Kabylia of Djurdjura, Northern Algeria." Sociobiology 68, no. 3 (2021): e6232. http://dx.doi.org/10.13102/sociobiology.v68i3.6232.

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The current study deals with the diversity of ants (Hymenoptera, Formicidae) in Kabylia of Djurdjura. It has been carried out in two forest sites from the localities of Azeffoun and Assi-Youcef, Tizi Ouzou (northern Algeria). Two sampling methods were adopted: manual capture and pitfall traps. Various community metrics were used as key elements to assess ant biodiversity within the two study sites. They included the species richness, the relative abundance, the constancy, and the Shannon-Weaver and equitability indices. Our inventory allowed identifying 24 species belonging to 12 genera and th

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Peter, S., B. Manojkumar, D. Pillai, et al. "Distribution and Diversity of Gelatinous Zooplankton in the South Eastern Arabian Sea, Kanyakumari to off Kollam." Vestnik Zoologii 52, no. 5 (2018): 379–88. http://dx.doi.org/10.2478/vzoo-2018-0040.

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Abstract An attempt was made out to study the distribution and diversity of gelatinous zooplankton in the South Eastern Arabian Sea in the region Kanyakumari to off Kollam. A total of 19 species belonging to 8 groups such as chaetognaths, siphonophores, Hydrozoa and Scyphozoa of the phylum Cnidaria, ctenophores, appendicularians, doliolids and salps were recorded. Chaetognaths were not only predominant group, but also the most numerous. Sagitta enfl ata was the most widely distributed chaetognath species from most of the stations studied. Th e siphonophores were the second most abundant group.

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Bachir, Bouiadjra Benabdallah, Malika Ghellai, Mohamed Daoudi, Ibrahim Elkhalil Behmene, and Bouiadjra Mohammed El Amine Bachir. "Impacts of the invasive species Caulerpa cylindracea Sonder, 1845 on the algae flora of the west coast of Algeria." Biodiversity Data Journal 9 (May 26, 2021): e64535. https://doi.org/10.3897/BDJ.9.e64535.

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The assessment of the impacts of the expansion of the invasive species on taxonomic diversity, the abundance and dominance of groups of algae, the presence and/or absence of species of ecological interest that may or may not be indicative of water quality well mentioned, through the installation of a 20 × 20 cm quadrat representing the minimum area. The observation stations were visited monthly, during a repetitive three-year cycle, during the spring, summer and autumn seasons, periods of maximum growth and development of the algal flora and the results suggest the following facts. The invasiv

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Ajeel, S. G., and M. F. Abbas. "Diversity of Cladocera of the Shatt Al-Arab River, Southern Iraq." Mesopotamian Journal of Marine Sciences 27, no. 2 (2022): 126–39. http://dx.doi.org/10.58629/mjms.v27i2.163.

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Samples of zooplankton were collected monthly from three stations in the Shatt Al-Arab region (Al-Hartha, Garmat Ali and Al-Ashaar) for the period from June 1996 to May 1997 using a plankton net with a mesh-size of 120 µm. Twenty species of Cladocera belonging to 14 genera were recorded in the study area. The total number of Cladocera ranged between 0.3 ind./m3 during October 1996 and 7207 ind./m3 during April 1997. The highest values of Shannon Weaver diversity index and Richness index were recorded at station 3 during December and June (1.8 and 7.62, respectively), and the lowest values were

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Kobenan Mathieu Kra, Yomi Junior Simmou, Michel Laurince Yapo, Diangoné Jacob Youan Bi, and Dramane Diomandé. "Preliminary data on the odonatofauna in Pelefero Gon Coulibaly University’s forest reserve perimeter (Northern of Côte d'Ivoire)." World Journal of Advanced Research and Reviews 21, no. 1 (2024): 641–49. http://dx.doi.org/10.30574/wjarr.2024.21.1.2671.

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The ecological importance and diversity of Odonata are most often underestimated. However, their sensitivity to environmental conditions makes them excellent biological indicators of environmental conditions. The aim of this study is to explore the diversity of Odonata within and around Peleforo Gon Coulibaly University forest reserve, with a view to providing valuable data to guide conservation efforts. The Odonata were collected using a sweep net from May to August 2023. This study revealed a preliminary list of 28 species of Odonata including 26 species of Anisoptera and 2 species of Zygopt

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Kobenan, Mathieu Kra, Junior Simmou Yomi, Laurince Yapo Michel, Jacob Youan Bi Diangoné, and Diomandé Dramane. "Preliminary data on the odonatofauna in Pelefero Gon Coulibaly University's forest reserve perimeter (Northern of Côte d'Ivoire)." World Journal of Advanced Research and Reviews 21, no. 1 (2024): 641–49. https://doi.org/10.5281/zenodo.13218824.

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 The ecological importance and diversity of Odonata are most often underestimated. However, their sensitivity to environmental conditions makes them excellent biological indicators of environmental conditions. The aim of this study is to explore the diversity of Odonata within and around Peleforo Gon Coulibaly University forest reserve, with a view to providing valuable data to guide conservation efforts. The Odonata were collected using a sweep net from May to August 2023. This study revealed a preliminary list of 28 species of Odonata including 26 species of Anisoptera and 2 species of

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Nahić, Belma, Amina Omeragić, Adi Vesnić, Mahir Gajević, and Aldijana Mušović. "Diversity of aquatic macroinvertebrate communities in the Misoča River: the argument for conservation." Natura Croatica 33, no. 1 (2024): 13–27. http://dx.doi.org/10.20302/nc.2024.33.2.

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In the present study the macroinvertebrate composition in the Misoča River, its diversity and abundance were analyzed. The study was conducted in autumn and spring, in order to determine the influence of seasonal dynamics on the structure of macroinvertebrate communities and water quality. A biotic element analysis revealed a high abundance and diversity of macroinvertebrate taxa. Significant differences in the structure of communities with respect to seasons and sampling sites were observed, as well as in species dominance, which was confirmed by the Bray-Curtis similarity analysis. The resul

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Kondrateva, Tatiana, Tatiana Nikonenkova, and Nadezhda Stepanova. "Using Cilioplankton as an Indicator of the Ecological Condition of Aquatic Ecosystems." Geosciences 9, no. 11 (2019): 464. http://dx.doi.org/10.3390/geosciences9110464.

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We assess the quality of surface water in water bodies located in the Middle Volga region (Russian Federation). The water quality is assessed using 19 chemical compounds and cilioplankton indicators, such as the total number of species, the abundance of each species, and, based on both of them, the saprobity index and the Shannon–Weaver diversity index (H). We classify the water quality from polluted to extremely dirty by using abiotic indicators, and from conditionally clean to dirty by means of biotic indicators. Using the logistic regression method, we are able to predict the water quality

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Alencar, Francisca Reijane Gadelha de, Charles Lobo Pinheiro, Francisco Linco de Souza Tomaz, Cândida Hermínia Campos de Magalhães Bertini, and Ana Kelly Firmino da Silva. "Parental selection and descriptor evaluation in the identification of superior cowpea genotypes." Agronomía Colombiana 39, no. 3 (2021): 313–21. http://dx.doi.org/10.15446/agron.colomb.v39n3.95660.

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The objective of this study was to evaluate and quantify the genetic divergence between accessions of cowpea, aiming to identify the characters that most contribute to diversity and select superior parents. Seventy-six cowpea accessions were evaluated using 19 descriptors that were also utilized to estimate genetic diversity using the Shannon-Weaver index. Phenology and production data were analyzed using descriptive statistics and were subjected to Pearson’s correlation test. The descriptors flower color, pod color, and seed brightness showed greater variability in the quantification of genet

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Rong, Guohua, Yucui Ning, Xu Cao, et al. "Evaluation of optimal straw incorporation characteristics based on quadratic orthogonal rotation combination design." Journal of Agricultural Science 156, no. 3 (2018): 367–77. http://dx.doi.org/10.1017/s002185961800028x.

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AbstractFor straw incorporation, three crucial factors affect the soil microbial community and various enzyme activities: straw length, amount and burial depth. To analyse the individual and interactive effects of these three factors on the soil microbial community and various enzyme activities, 23 treatments with five levels of the three variables (straw length, amount and burial depth) were applied in a quadratic orthogonal rotation combination design. A comprehensive indicator was constructed that could represent soil microbial functional diversity and enzyme activity by determining the wei

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Abdullah, Sajad A. "Diversity of fishes in the lower reaches of Tigris River, north east of Basrah province, Southern Iraq." Basrah Journal of Agricultural Sciences 30, no. 1 (2017): 85–96. http://dx.doi.org/10.37077/25200860.2017.25.

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The present work is to assess the fish structure and diversity status in the Tigris River, northeast of Basrah province from October 2015 to September 2016 in relation to some ecological factors. Three stations were selected; first station was located at the north of the east Qurna city in Al-Jewber village, the second station was located at a distance of 7 km after the first station in the Abu Aran village and the third station was in Qurna city. Water temperature, dissolved oxygen, salinity and total alkalinity were measured from the study areas. Several fishing methods were adopted to colle

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Zhang, S., S. Hou, Y. Wu, and D. Qin. "Bacterial diversity in Himalayan glacial ice and its relationship to dust." Biogeosciences Discussions 5, no. 4 (2008): 3433–56. http://dx.doi.org/10.5194/bgd-5-3433-2008.

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Abstract. Concentrations and community diversity of bacteria from 50 segments of a 108.83 m ice core drilled from the East Rongbuk (ER) Glacier (28.03° N, 86.96° E, 6518 m above sea level) on the northeast slope of Mt. Qomolangma (Everest), covering the period 950–1963 AD, were investigated by epifluorescence microscope, DGGE and Shannon-Weaver index analysis. There are four general periods of bacterial diversity, corresponding to four phases of dust abundance revealed by Ca2+ concentrations. It is indicated that higher bacterial community diversity is associated with warm periods, while lower

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Sarra, Ghalem, Kechairi Reda, Hassani Faiçal, and Abdelli Imene. "Diversity index of argania spinosa l. Skeels plant formation in the algerian western sahara." Bangladesh Journal of Botany 53, no. 3 (2024): 447–57. http://dx.doi.org/10.3329/bjb.v53i3.76255.

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The argan (Argania spinosa) is a xerothermophilous tree, endemic in North-West Africa. In Algeria, it is found as wild in the northwest of the Hamada du Drâa of Tindouf (Algerian Western Sahara), where it is characterized by a great floristic diversity. Several indices were calculated in this study to have a better knowledge on the state of biological diversity of the argan tree ecosystem. It is characterized by a floristic richness composed of 123 taxa belonging to 38 families including the dominance of three major floristic families: Asteraceae, Brassicaceae and Amaranthaceae. Biologically,

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