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Journal articles on the topic 'Shannon Weiner index'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Kumar, Pavan, Manmohan Dobriyal, Amey Kale, A. K. Pandey, R. S. Tomar, and Elizabeth Thounaojam. "Calculating forest species diversity with information-theory based indices using sentinel-2A sensor’s of Mahavir Swami Wildlife Sanctuary." PLOS ONE 17, no. 5 (2022): e0268018. http://dx.doi.org/10.1371/journal.pone.0268018.

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Tropical forest serves as an important pivotal role in terrestrial biological diversity. The present study makes an attempt to identify the concentration of species among tree diversity in Mahavir Swami Wildlife Sanctuary, Bundelkhand, India. Four important ecological indicator indices namely Shannon-Weiner index (H’), Simpson’s diversity (D), Margalef index (SR) and Pielou’s (J) indices were make the most for species diversity measurement. The research outcomes revealed that Shannon-Weiner diversity index (H/) was found to be the best index for assessing species richness while Simpson’s diver

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Williams, M. Sam, and Neelam Khare. "Study of Plant Diversity in Red Sanders Park in Chittoor District of Andhra Pradesh, India." International Journal of Plant & Soil Science 35, no. 19 (2023): 37–64. http://dx.doi.org/10.9734/ijpss/2023/v35i193521.

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The study deals with the assessment of plant diversity in Red Sanders park in Chittoor district of Andhra Pradesh, India. A total of nine species of trees belonging to six families with 1625 individuals, 25 species of shrubs belonging to 18 families with 2,042 individuals and 40 species of grasses and herbs belonging to 14 families with a total of 1,016 individuals were encountered. Quadrat size of 400 m2 were established for trees, 100 m2 for shrubs, 20 m2 for grasses and herbs. In terms of IVI, Pterocarpus santalinus was found to be the most dominant tree species, chromolaena odorata was fou

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3

Sakachep, Martin, and Neelam Khare. "Assessment of Plants Biodiversity in Innerline Reserve Forest, Hailakandi, Assam, India." International Journal of Environment and Climate Change 13, no. 10 (2023): 1825–34. http://dx.doi.org/10.9734/ijecc/2023/v13i102838.

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The study deals with the “Assessment of Plant biodiversity of Innerline Reserve Forest, Hailakandi (Assam)” India. that was carried out in six sites. A total of 54 species of trees belonging to 32 families with 2,303 individuals, 17 species of shrubs belonging to 13 families with 2,195 individuals and 27 species of grasses and herbs belonging to 13 families with a total of 1,595 individuals were encountered. Quadrate size of 400 m2 for trees, 100 m2 for shrubs, 20 m2 grasses and herbs. Compared to all the six sites, Site-III shows the highest Basal area (243.67 m2). In terms of IVI, Tectona gr

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Bal, Solanki, Arup Chattopadhyay, and Asit Kumar Mandal. "Phenotypic Variability among Chilli Germplasms Using Shannon-Weiner Index (H')." International Journal of Bio-resource and Stress Management 15, Apr, 4 (2024): 01–08. http://dx.doi.org/10.23910/1.2024.5165a.

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The investigation was conducted during the rabi season (September 2019 to February 2020) of 2019 to 2020 at the research field of All India Co-ordinated Vegetable Crops, located at Bidhan Chandra Krishi Viswavidyalaya in Kalyani, Nadia, West Bengal, India. The aim of the study was to examine the characteristics of twenty-six chilli genotypes across twelve qualitative traits. The investigation unveiled a broad range of phenotypic variability using Randomized Block Design in three replications. Among the assessed traits, leaf density, leaf shape, fruit shape, plant habit, fruit curvature, and an

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Jha, Praveen Kumar. "Seasonal Diversity of Birds in Nagarjun Forest of Shivapuri Nagarjun National Park, Kathmandu, Nepal." Tribhuvan University Journal 35, no. 1 (2020): 33–43. http://dx.doi.org/10.3126/tuj.v35i1.35832.

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Nagarjun forest of Shivapuri Nagarjun National Park plays a significant role in the conservation of avifaunal diversity, but there are very few studies on birds of such local biodiversity hotspots in Nepal. The objective of the present study was to obtain information on seasonal diversity, species richness and relative abundance of birds in Nagarjun forest. The study was carried out from August 2019to June 2020 covering two seasons (autumn and spring). A total of 97 species of birds belonging to 10 orders and 42 families were recorded from three trails. Total22 Mackinnon’s lists were produced

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Liadi, M. T., A. A. Adesiyun, R. O. Uddin II, A. A. Oyerinde, and E. A. Orijemie. "Analysis of Pollen in Stingless bee (Meliponula ferruginae [ Moure]) Honey, an Indicator of Deforestation Levels at University of Ilorin and its Environs." Nigerian Journal of Entomology 40, no. 1 (2024): 1–26. http://dx.doi.org/10.36108/nje/4202/04.0110.

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Pollen analysis of the honey of stingless bees was conducted to ascertain the levels of deforestation in the campus of the University of Ilorin, North Central Nigeria. Thirteen honey samples from the nests of Meliponula ferruginae in four different localities, with varied deforestation levels, in the University of Ilorin Agro-Ecological areas were analysed. Pollen grains were identified and counted under high power light microscope. Species diversity assessed using Shannon diversity index, species richness and dominance of the floral origin of the pollen were calculated using PAST Software. A

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Pokharel, Neeta, Bishal Bhandari, Mahamad Sayab Miya, and Nikita Phuyal. "Avifaunal diversity inside and outside protected area: A case of Sundarijal Forest and Changunarayan Forest, Kathmandu Valley, Nepal." Nepalese Journal of Zoology 7, no. 1 (2023): 36–47. http://dx.doi.org/10.3126/njz.v7i1.56309.

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This study aimed to compare the diversity of birds between protected and non–protected areas that are similar in climatic and geographical features. The study was carried out in three different habitat types (Forest, Agricultural land and Wetland of protected Sundarijal and Non-protected Changunarayan. Field data were collected using a “Point Count Approach” in transects which were laid in different habitat types (Forest, Agricultural land & Wetland). Shannon-Wiener and Margalef Diversity Indices were used to calculate the diversity of birds and Pielou’s Evenness was used to calculate the

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Chen, Yu Hui, Yong Zhang, Min Sheng Huang, Yi Fan Zhang, Feng Zhao, and Jin Hong Luo. "Ecological Restoration by a Multistage Floating-Bed System in a Eutrophic Urban River, China." Applied Mechanics and Materials 157-158 (February 2012): 945–49. http://dx.doi.org/10.4028/www.scientific.net/amm.157-158.945.

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By constructing a multistage floating-bed system by combination of macrophytes, aquatic animals and aquamats ecobase for ecolgical restoration in a eutrophic urban river, the improvement of water quality and the dynamic variation of phytoplankton was investigated. The results showed that the average removal rates were 9.85%, 15.86%, 24.47% and 12.75%, respectively. phytoplankton quantity was decreased by 22.82×104ind./L and Shannon-Weiner Index was increased by 0.11 averagely, after the restoration work in the demonstration area comparing to control area. The negative correlation between Shann

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Nurhandani, Pebi, Marheni, Irda Safni, and Setia Sari Girsang. "Diversity of Insects in Shallot (Allium ascalonicum L) Plantations at Various Altitudes." Jurnal Pertanian Tropik 5, no. 2 (2018): 215–22. http://dx.doi.org/10.32734/jpt.v5i2.2994.

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Recently the improvement of shallot seed quality using true shallot seed has been developed. This research was aimed to know diversity of insects and the role of insects on the cultivation of shallot seeds in various altitudes. This research was conducted in three different districts (Deli Serdang, Simalungun and Toba Samosir districts) in Plant Pests and Diseases Laboratory, Faculty of Agriculture, University of North Sumatra, Medan from July 2017 until January 2018. This research used four different insect traps (sweep net, pitfall trap, hand picking, and yellow trap), and repeated for six t

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A. H., Nurridan. "The Fish and Prawn Diversity of Sungai Pasu,Miri Sarawak." Sarawak Museum Journal LXXXIV, no. 105 (2021): 135–46. http://dx.doi.org/10.61507/smj22-2021-bb77-09.

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Sungai Pasu is one of the adjoining rivers to Kuala Baram and plays a significant economic role in terms of fisheries. This study was carried out to investigate the fish and prawn species diversity in Sungai Pasu using local fishing boats and cast nets in wet season and dry season. The wet season in this study was in March 2019, November 2019 and March 2020, while the dry season was in April to August 2019. Fish and prawn diversity indices were calculated using Shannon-Weiner and Pielou Evenness. A total of 37 species from 24 families were recorded. The dominant fish species recorded was Kurtu

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Sivaruban, T., S. Barathy, Pandiarajan Srinivasan, Rajasekaran Isack, and Bernath Rosi. "Impact of ecological attributes and feeding categorization of Ephemeroptera, Plecoptera and Trichoptera (EPT) insects in Kiliyur falls of Eastern Ghats, India." ENTOMON 45, no. 3 (2020): 171–80. http://dx.doi.org/10.33307/entomon.v45i3.548.

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Investigation on the diversity, ecology and trophic categorization of Ephemeroptera, Plecoptera and Trichoptera complex (EPT) was carried out in Kiliyur falls of the Eastern Ghats. An aggregate of 2,189 specimens belonging to 24 genera, 12 families and 3 orders were collected. Ephemeroptera was found to be high when compared to Plecoptera and Trichoptera. Baetidae was the most abundant taxa of all with presence of 5 genera and 6 species. Shannon-Weiner index and Simpson’s index were calculated and it shows that Shannon-Weiner index was elevated in the August (2.882) and declines in January (2.

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Nambiar, Kavya B., and Jyothi Miranda. "Community Structure and Diversity of Mangroves at Kannur District of Kerala, Southwest Coast of India." International Journal of Ecology and Environmental Sciences 50, no. 4 (2024): 577–83. http://dx.doi.org/10.55863/ijees.2024.0106.

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Mangrove forests are among the world’s most productive ecosystems situated at the interface between land and sea/backwaters in tropical and subtropical latitudes. Mangrove vegetation in three geographical regions of Kannur on the southwest coast of India was assessed for its community structure and diversity indices. Thirteen true mangrove species belonging to 9 genera and 7 families formed the mangrove vegetation of the region. Highest density was recorded for Acanthus ilicifolius (7953 stems/ha), followed by Rhizophora mucronata (3750 stems/ha). A. ilicifolius is the most common species with

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Bāders, Endijs, Pauls Zeltiņš, Didzis Elferts, Dainis Ruņģis, Arnis Gailis, and Āris Jansons. "Trends in genetic diversity of silver birch: Insights from varied planting scenarios." Baltic Forestry 30, no. 2 (2024): id759. http://dx.doi.org/10.46490/bf759.

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This study explores the impact of planting strategies on genetic diversity in silver birch (Betula pendula Roth) stands using simulation models. We examine the influence of different proportions of planted stands and the number of open-pollinated families on genetic diversity, focusing on the Shannon-Weiner Diversity Index and expected heterozygosity. Results indicate optimal genetic diversity increases with 50–55% planted stands. Additionally, using more families in planting enhances diversity, peaking when 30 families were used compared to five. Simulations suggest that combining natural reg

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Eugenia P. Lal, Pynkupbor Jyndiang, Somnath Sen Neelam Khare, and Afaq Majid Wani. "Phytodiversity of Threatened Ethno Medicinal Plant Species in West Khasihills District of Meghalaya, India." International Journal of Current Microbiology and Applied Sciences 10, no. 12 (2021): 139–46. http://dx.doi.org/10.20546/ijcmas.2021.1012.015.

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The exploration and survey for diversity of threatened of ethno-medicinal plant species in West Khasi Hills District of Meghalaya was conducted during 2020-2021 for 15 villages in Byrki, Pyndensohphoh, Pyndenmawbah, Marshan, Thangkhmahjah, Nongkhlaw, Nongkynjang, Nonglwai-I, Nonglwai-II, Mawthungkper, Jaidoh, Nongklung Rim, Nongklung, Marskuin and Nongjyllieh. The methodology followed the quantitative analysis and use of phytosociological aspects between the species. Quadrate size 100m2 for trees, 50m2 for shrubs and 10m2 for herbs were used and herbariums were made for every species specimen

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15

Yadav, Shailendra Kumar, Babu Ram Lamichhane, Naresh Subedi, et al. "Diversity, Abundance, and Trend of Water Birds Outside the Protected Area of Western Lowlands, Nepal." Ring 46, no. 1 (2024): 3–18. https://doi.org/10.2478/ring-2024-0001.

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Abstract Waterbirds play a vital role in balancing aquatic ecosystems. Regular studies of their conservation status are crucial. Three major wetlands: Karnali River, Geruwa River, and Badhaiya Lake were surveyed from 2011 – 2016 and 2021 to assess the species and sites’ long-term status. We counted all water birds in these areas using the point count method in Badhaiya Lake and the Line transect method for river tran-sects of Karnali and Geruwa. Shannon-Weiner diversity index, Margalef richness index, and Pilou evenness index were calculated for each year and site to understand diversity and r

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Demapitan, Marylene M., Florence Roy P. Salvaña, and Cherie Cano-Mangaoang. "Community structure and regeneration capacity of mangrove forest." Environmental and Experimental Biology 21, no. 4 (2024): 111–17. http://dx.doi.org/10.22364/eeb.21.13.

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Mangrove forests play a vital role in the environment. They provide a number of ecosystem services for supporting marine biodiversity, humans, and other living organisms inhabiting the area. This study aimed to determine the community structure and regeneration capacity of mangrove forests in Lebak, Sultan Kudarat, Philippines. Community structure was determined through relative density, relative frequency, relative dominance, and importance value. Using the center point circular plot method, 13 plots with 40 m diameter were established in two sampling sites: natural stand and reforested. Shan

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Saravanan, S., K. Ravichandran, A. Balasubramanian, and K. Paneerselvam. "Structure and Floristic Composition of Tree Diversity in Andaman Tropical Evergreen Forest of Middle Andaman, India." Indian Journal of Forestry 36, no. 2 (2013): 167–71. http://dx.doi.org/10.54207/bsmps1000-2013-uz2n91.

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A study was conducted to analyze diversity richness and correlation between different diversity richness at species level. Nine Quadrates of 10 x 10m sample plots were laid out randomly and enumerated the trees for various studies. Species wise Importance Value Index, Shannon-Weiner Index, Simpson Index were calculated. Tree density varies from 11.11 to 144.44 ha-1 with the average basal area of 608.30 m2/ha-1. The Shannon-Weiner Index (H') ranges from 0.061 to 0.314. The Simpson Index varies from 0.00021 to 0.0355. The Margalef Species Richness Index varies from 3.65 to 56.54. Further, the re

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Khitam, Abbas Merhoon, Manher Alkam Foad, and Remzi Nashaat Muhanned. "Assessment of Phytoplankton Diversity in Al-Diwaniya River, Iraq." Annual Research & Review in Biology 14, no. 2 (2017): 1–9. https://doi.org/10.9734/ARRB/2017/33228.

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<strong>Background and Aim:</strong> The present study was conducted to determine the biodiversity of the phytoplankton community in Al-Diwaniya River. <strong>Place and Duration of Study: </strong>Al-Diwaniya River in Al-Qadisiyah Province at three stations (station 1 is located to the north of the city, station 2 is located in the city center and station 3 is located south of the city) during four season of 2015. <strong>Methodology: </strong>The evaluation included biological aspects using qualitative and quantitative studies of phytoplankton, Species Richness index D, Shannon – Weiner inde

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Mojiol, Andy R. "The Effect of Urbanization on The Stand Structure of A Mangrove Forest in Likas Bay, Sabah Malaysia." HUTAN TROPIKA 18, no. 1 (2023): 1–6. http://dx.doi.org/10.36873/jht.v18i1.9699.

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The aims of this study were to determine the effect of urbanization on species composition, change to stand structure and tree species on the mangrove stand between the housing development and the river. Two (2) plots were established, with five (5) subplots each measuring 10m x 10m. Simpson’s Index, Shannon-Weiner Index, Shannon evenness and Important Value Index (IVI) were used to determine the diversity and abundance of tree species. There are 4 species found in both plots which are Avicennia alba, Avicennia marina, Rhizophora mucronata and Rhizophora apiculata. The most abundant species is

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Islam, MM, A. Hossain, and SC Mandal. "Impacts of Water Quality on Finfish and Shellfish Biodiversity in the River Meghna." Dhaka University Journal of Biological Sciences 31, no. 1 (2022): 19–27. http://dx.doi.org/10.3329/dujbs.v31i1.57913.

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Fish biodiversity largely depends on different environmental factors including water quality parameters. The current study was conducted to investigate the impacts of water quality variables on fish biodiversity at upstream and downstream of the river Meghna in dry and rainy season in 2011. Twelve water samples and 66 fish samples were collected from 2 different sampling stations of the river Meghna during the study period where 61 were finfish species and 5 were shellfish species. The number of finfish and shellfish catch at upstream in both dry and rainy seasons were significantly higher tha

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Kakoli Banerjee, Sumana Bhattacharyya,. "Shannon Weiner Index: A Proxy to Evaluate the Floral Health of Indian Sundarbans." International Journal of Innovative Research in Science, Engineering and Technology 4, no. 9 (2015): 8201–5. http://dx.doi.org/10.15680/ijirset.2015.0409027.

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Hai Ly, Nguyen Thi. "A SURVEY OF VASCULAR PLANT SPECIES IN THE DRY SEASON, CAM MOUNTAIN, AN GIANG PROVINCE." Vietnam Journal of Science and Technology 54, no. 2A (2018): 64. http://dx.doi.org/10.15625/2525-2518/54/2a/11912.

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The survey which was conducted in the dry season (from February to April) in Cam Mountain, reported 49 plant species belonged to 45 genera and 29 families. These species include 10 big wood species (G) (20.4 %), 14 small wood species (g) (28.6 %), 7 bush species (17.2 %), 9 creeper species (18.4 %) and 9 herbaceous species (18.4 %). There are 33 species used for herbal medicines, 12 species for wood fire, 11 species for fruit, 10 species for household tools and 9 species for food. Pterocarpus macrocapus Kurz is the species that listed in Viet Nam Red Data Book (2007). The average value of Marg

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Adesoye, Oluwaseun Adegbola, Adewale D. Adediran, Tolulope Oyeniyi, et al. "Implications of larval breeding sites on diversity of mosquito species in Suleja Metropolis, Northcentral Nigeria." Dutse Journal of Pure and Applied Sciences 10, no. 1a (2024): 20–28. http://dx.doi.org/10.4314/dujopas.v10i1a.3.

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Information on native mosquito species viz-a-vis the nature of their breeding sites can help determine the epidemiology of mosquito-borne diseases in an environment, hence, species of mosquito in breeding sites were surveyed in Suleja metropolis. All accessible larval habitats were surveyed between June and October, 2023 within Suleja township and New (Sabo) Gwazunu both of which are within Suleja metropolis. A total of five species: An. gambiae s.l, Cx. quinquefasciatus, Aedes albopictus, Aedes aegypti, and Cx. papiens were encountered. The mean values of larvae recovered from transient habit

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Raza, Taqi, Talha Rehman, Ahmad Nawaz, Muhammad Uamr Javed, and Sami Ullah. "Diversity and abundance of insects in cotton crop land of Punjab, Pakistan." GSC Biological and Pharmaceutical Sciences 9, no. 2 (2019): 117–25. https://doi.org/10.5281/zenodo.4283277.

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Cotton crops have central role in Pakistan’s economy. Cotton belongs to Kingdom plantae, Family Malvacea and genus Gossypium. <em>Gossypium arboretum</em> species of cotton is cultivated in Pakistan. Macro invertebrates are organisms that lack spine and large enough to seen with the naked eye. The present research is performed to check the diversity and abundance of different insects on cotton crop from two districts of province Punjab, Pakistan. Sampling was done from Multan and Faisalabad. The specimens were collected through the use of hand net bowl trap and sweep net. A tot

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Khot, Mayura, Ashok Jaiswar, and Asim Pal. "Diversity, Distribution and Checklist of Brachyuran Crabs Inhabiting Along the Mumbai and Konkan Coast of Maharashtra, India." Marine Science and Technology Bulletin 14, no. 1 (2025): 20–40. https://doi.org/10.33714/masteb.1601894.

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The present paper includes a diversity of brachyuran crabs inhabiting along intertidal and shallow subtidal regions of Mumbai and Konkan coasts of Maharashtra, India. During a survey from 2014 to 2016, a total of 55 species of crabs, belonging to 45 genera and 22 families, were recorded from these areas. According to the Shannon Weiner index (H’), the maximum diversity was recorded around Mumbai rocky shores, having mixed types of microhabitats. The values of Shannon-Weiner index (H’) varied between 2.3 and 3.0 for Mumbai as well as Jaitapur, whereas, evenness varied between 0.86 and 0.97, whi

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Makvana, Rahulkumar, and Harsh Bodh Paliwal. "Phytosociological Studies of Tree Species Biodiversity in Sabarkantha District, Gujarat." Environment and Ecology 41, no. 3B (2023): 1773–77. http://dx.doi.org/10.60151/envec/ihjm7356.

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The present work aimed to study the “Phytosociological Studies of Tree Species in Sabarkantha District, Gujarat” was conducted in the rural area 14 sites under Sabarkantha district village during the period of January to May 2022 have been presented and discussed in this chapter. Several field trips of duration 2 to 3 days were made at regular intervals to various part of Sabarkantha district, Gujarat. The study was done to assess the tree diversity ad species richness of the rural areas. A grand total 2085 tree presenting 55 species and 27 families were identified from the total area. Fabacea

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Ashraful, Md Ashraful Islam, and M. Mahfuzur Rahman. "Effects of roadside cultivation of napier grass (pennisetum purpureum schumach.) On wild natural vegetation of Kaliganj, Gazipur, Bangladesh." Bangladesh Journal of Botany 53, no. 4 (2024): 913–22. https://doi.org/10.3329/bjb.v53i4.78637.

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Effects of roadside cultivation of exotic Pennisetum purpureum on floristic composition and phytodiversity of wild vegetation in natural roadsides of Kaliganj upazila, Gazipur were studied during 2023 to 2024. A total of 117 vascular plant species comprising of 108 genera under 47 families have been recorded in natural roadside area and a total of 38 vascular plant species comprising of 36 genera under 18 families have been recorded in Pennisetum cultivated roadside area. In natural roadsides, maximum 97 species belonged to dicotyledons followed by 18 monocotyledons and 2 pteridophytic species

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Muslim, Muslim, and Mochamad Syaifudin. "Biodiversity of Freshwater Fish in Kelekar Floodplain Ogan Ilir Regency in Indonesia." Journal of Tropical Biodiversity and Biotechnology 7, no. 1 (2022): 67494. http://dx.doi.org/10.22146/jtbb.67494.

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The purpose of this study is to investigate fish biodiversity in the Kelekar floodplain. The study is explorative, with the determination of observation stations and with purposive sampling methods. Fishes were captured approximately 1.509 individuals consisting of 17 families and 24 species. The Shannon-Weiner diversity index was 2.394; 2.691; and 2.183 for station 1, 2, and 3, respectively. The Evenness index was 0.764; 0.871; and 0.806 for station 1, 2, and 3, respectively, meanwhile the highest value of Simpson’s dominance index was 0.045. The biodiversity index of the three stations was i

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Ms., Geetirekha Dutta, and Monjeet Sonowal Dr. "AQUATIC BIOINDICATORS OF LOHIT RIVER FOR WATER QUALITY ASSESSMENT." INTERNATIONAL EDUCATION AND RESEARCH JOURNAL - IERJ 10, no. 11 (2024): 23–25. https://doi.org/10.5281/zenodo.15605935.

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The study was conducted on Lohit River for consecutive two years which is transboundary to Arunachal Pradesh and Assam of India. The observations recorded seasonal variations of macroinvertebrates richness, which serves as a bioindicator. Collected macroinvertebrates falling under the phyla Arthropoda and Mollusca, revealed 13 orders, 35 families, and 38 species. The biotic indices like Shannon-Weiner diversity index, Simpson’sdiversity index, Marglef richness index, Sorensens similarity index have shown relatively better quality of water. The calculated BMWP, ASPT and FBI score highligh

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Jha, Praveen Kumar. "Diversity of Birds in the Foothills of Phulchoki Hill, Lalitpur, Nepal." Forestry: Journal of Institute of Forestry, Nepal 16 (November 30, 2019): 62–71. http://dx.doi.org/10.3126/forestry.v16i0.28354.

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Bird survey was conducted in Phulchoki hill during two different seasons in January 2018 and April 2018. The objective of the study was to identify seasonal avian diversity, and to determine relative abundance and species richness. Fixed radius point- count method was used to evaluate the bird diversity and their number. Shannon-Weiner Diversity Index was used to calculate the diversity of species during two different seasons. A total of 78 species of birds belonging to 7 orders and 24 families were recorded. Passeriformes was the most dominant order with 58 species and Sylvidae was the most d

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Llait, Christian Ofalla. "Tree Species Composition and Diversity in a Secondary Forest along the Sierra Madre Mountain Range in Central Luzon, Philippines: Implications for the Conservation of Endemic, Native, and Threatened Plants." Journal of Zoological and Botanical Gardens 5, no. 1 (2024): 51–65. http://dx.doi.org/10.3390/jzbg5010004.

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The Sierra Madre Mountain Range (SMMR) is the backbone of the Luzon Islands that contains a high concentration of highly important ecological resources distributed among the 68 protected areas therewith. The present study aimed to assess the composition and diversity of tree species in a secondary forest within the SMMR. A 2.25 km transect with 10 900-m2 plots were established to record tree species with a diameter at breast height of at least 10 cm. The findings revealed 148 individuals of trees from 38 morphospecies, 28 genera, and 20 families. Importance values unveiled the Aurora endemic M

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Indrawan, Gede Surya, Putu Angga Wiradana, I. Made Saka Wijaya, Abd Rahman As-syakur, M. Rheza Rizki Syahputra, and I. Made Sara Wijana. "Checklist, Indeks Ekologi, dan Status Konservasi Komunitas Fauna Akuatik di Kawasan Sungai Unda dan Sekitar Pantai Jumpai, Kabupaten Klungkung, Provinsi Bali." Bumi Lestari Journal of Environment 21, no. 1 (2021): 9. http://dx.doi.org/10.24843/blje.2021.v21.i01.p02.

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Aquatic organisms or nekton have an important role in supporting the stability of the aquatic environment and human life. This study aims to determine the nekton type community, ecological index, and their conservation status in the Unda River area and around Jumpai Beach, Klungkung Regency, Bali. The study was conducted in July - August 2020. The study was conducted in 2 communities, namely Macrozoobenthos and Nekton. Macrozoobenthos samples were collected using the quadratic method in the Jumpai Beach area and the direct observation method along the Unda River. Nekton communities are collect

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Fitriyyah, Ita, Mohamad Yosef Firdaus, Astuti Kusumorini, and Rahmat Taufiq Mustahiq Akbar. "Diversity of Fish Species as Bioindicators of Water Quality in The Cikapundung River, Bandung City." Jurnal Biologi Tropis 24, no. 3 (2024): 412–21. http://dx.doi.org/10.29303/jbt.v24i3.7009.

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Human activity along the river impacts the aquatic environment from biotic and abiotic factors. One indicator that can reflect the quality of the waters is fish diversity. Several studies have used fish diversity as a biological indicator to determine the quality of waters, such as lake and river waters. The purpose of this study was to determine the diversity of fish and also to determine the quality of water in the Cikapundung River, Bandung City. The method used in this study was a survey and exploration method, which involved collecting samples at five stations using umbrella traps, cast n

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Dr Shivali Kharoliwal and Dr Surabhi Shrivastava. "A Rapid Assessment of Alpha Diversity by Use of Shannon Diversity Index-A Statistical Tool." International Journal of Scientific Research in Science and Technology 12, no. 3 (2025): 1378–84. https://doi.org/10.32628/ijsrst25123154.

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The Shannon index is an information statistic index, which means it assumes all species are represented in a sample and that they are randomly sampled. Species richness, evenness, and diversity are used to compare different populations(Magurran, A. E. 2004.). This index quantifies the diversity of a community by considering both the number of species (species richness) and the evenness of their distribution(Species richness).Biodiversity indices can help prioritize conservation efforts by identifying areas of high biodiversity importance and species in need of protection(Simpson E.H. 1949) .Th

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Nazma, Khatun and Debnath Palit. "Assessment of Phytoplankton Diversity and its Role in Biomonitoring Water Quality of Pitlakes in the Raniganj Coalfield, India." Environmental Science Archives 4, no. 1 (2025): 247–56. https://doi.org/10.5281/zenodo.15269536.

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This work presents the detailed study of the composition and diversity of phytoplankton and its dynamics through different seasons in the pitlake ecosystem. Several pitlakes of Raniganj coalfield were selected for that purpose. A total of 66 species of phytoplankton belonging to 7 phyla and 10 classes of phytoplankton were recorded. Bacillariophyceae was the most prevalent class of phytoplankton, whereas Heterokontophyta was the most prevalent phylum. Several diversity indices such as Menhenik, Margalef, Dominance, Simpson, Shannon, Berger-Parker, Brillouin, and Pielou’s Evenness index w

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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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Kumaraswamy, K., M. Mamatha, D. Ravivarma, Bochu Jeevan, D. Ananda Shiny, and Madhava Rao Siripurapu. "Phytodiversity of Herbaceous Flora in the Grasslands of Jannaram Division, Kawal Tiger Reserve, Telangana, India." International Journal of Environment and Climate Change 13, no. 11 (2023): 1886–93. http://dx.doi.org/10.9734/ijecc/2023/v13i113346.

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Aims: To study the diversity and composition of herbaceous species in the grasslands of Jannaram division, Kawal Tiger Reserve, Telangana, India. Place and Duration of Study: Grasslands of Jannaram division, Kawal Tiger Reserve, Telangana, July 2022 to August 2023. Methodology: The study was carried out by laying out 223 sample plots in the Jannaram division by dividing Jannaram division into 3 ranges. The plot size was 1 x 1 m. Varied diversity indices such as Simpson, Shannon–Weiner, species evenness, and IVI were calculated according to standard formulae. Vegetation analysis and

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Chowdhury, Santanu. "Diversity, Composition and Abundance of Avian Species of Oxbow Lake and Surrounding Area in Purbasthali, West Bengal, India." International Journal of Experimental Research and Review 30 (April 30, 2023): 306–20. http://dx.doi.org/10.52756/ijerr.2023.v30.028.

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Purbasthali oxbow lake is an important habitat for thousands of migratory and resident avian species. This study aimed to determine the current status of avifaunal diversity of Purbasthali oxbow lake and its surrounding area. During this study, diversity, composition and abundance, feeding guilds and the relationship between their habitat preferences and the numbers of individuals were determined. Direct observation, line transects and point count methods were applied for bird surveys for three consecutive years from 2019 to 2022. A total of 145 species of birds were documented, belonging to 1

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Rahmawati, Yunita Fera, Rizka Apriani Putri, Tatag Bagus Putra Prakasa, Chrisshinta Iris Aedhiningtyas, and Lisa Agustina Hermawan. "Abundance and Distribution Pattern of Macroinvertebrates at Watu Lumbung Beach, Gunungkidul, Yogyakarta." Biosfer: Jurnal Tadris Biologi 15, no. 2 (2024): 293. https://doi.org/10.24042/biosfer.v15i2.21705.

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This research aimed to determine the abundance and distribution of macroinvertebrates at Watu Lumbung Beach, Gunungkidul, Yogyakarta. The study was conducted in May 2022 using the quadratic transect method with a 1x1 m plot. Sampling was carried out at two randomly selected stations. The first station was located 50 meters from the Watu Lumbung reef, while the second station was 250 meters away, resulting in a 200-meter distance between the two stations. Data analysis involved calculating the Shannon-Weiner diversity index (H'). This study identified 16 species of macroinvertebrates at Watu Lu

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Raina, Anil Kumar, and Pinki Manhas. "Composition, structure and diversity of tree species along an elevational gradient in Dudu forest range, Jammu and Kashmir, India." Journal of Applied and Natural Science 10, no. 3 (2018): 981–85. http://dx.doi.org/10.31018/jans.v10i3.1847.

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The present study has been undertaken along an altitudinal gradient (950-3500m a.s.l.) in Dudu Forest Range of Udhampur Forest Division, Jammu & Kashmir, India to understand the composition, structure and diversity of tree species along an elevation gradient in the area. Ten forest types characterised by different dominant tree species with subtropical and temperate elements of vegetation have been recognised in the area.Overall average values of diversity indices such as Margalefâ€™s Index (MI); Menhinik Index (MeI); Shannon-Weiner Index (Hâ€™) and Simpson Index (D) have been observed to

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Mascarenhas, Shalma, Linoshka Dias, Shreya Borkar, Jena Monteiro, and Sakshi Naik. "EXPLORING MOTH DIVERSITY ACROSS RURAL AND URBAN AREAS OF SOUTH GOA." ANNALS OF ENTOMOLOGY 42, no. 02 (2024): 119. https://doi.org/10.59467/ae.2024.42.119.

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The investigation aimed to comprehend moths diversity across the rural and urban areas in the Salcete Taluka of South Goa in India. Moths were documented from August 2023 to January 2024 by setting up light traps. Ahigher diversity and abundance within rural areas, hosting 510 individuals from 24 families, was reported compared to urban settings, with 366 individuals from 17 families. The families Erebidae and Crambidae emerged as the most dominant across both habitats. The Shannon-Weiner diversity index indicated that the rural areas had higher species diversity than the study sites in the ci

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Oladele, A. T., F. S. Eguakun, and U. C. Ugbaja. "Amenity trees diversity in selected tertiary institutions within Port Harcourt Metropolis, Rivers State, Nigeria." Journal of Applied Sciences and Environmental Management 24, no. 12 (2021): 2175–81. http://dx.doi.org/10.4314/jasem.v24i12.25.

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Trees are a central component of most urban communities, providing diverse benefits such as improving air quality, increasing aesthetic appeal, preventing erosion and providing habitat for wildlife. However, there is inadequate information on the distribution and diversity of these trees within our academic environments. This study investigates the distribution, frequency and species diversity of amenity trees within the main campuses of tertiary institutions in River State, Nigeria. The selected tertiary institutions are University of Port-Harcourt (Institution A) and Rivers State University

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Muhammad, A., Zara Musa, and Musa Muhammad. "BASELINE STUDY OF DIVERSITY AND INSECT SPECIES RICHNESS RECORDED IN FEDERAL UNIVERSITY DUTSIN-MA TAKE -OFF CAMPUS, KATSINA, NIGERIA." FUDMA JOURNAL OF SCIENCES 9 (May 4, 2025): 317–22. https://doi.org/10.33003/fjs-2025-09(ahbsi)-3426.

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Worldwide, University campuses are increasingly mandating ecosystem preservation and conservation into their practices. The study investigated the diversity and species richness of insects at the Take-off Campus of Federal University Dutsin-Ma, Katsina State. Two sites, the Clinic and ICT complex were chosen to reflect the level of anthropogenic disturbance. Insects were collected using the light trap methodology. Data collected was analyzed using the Shannon-Weiner diversity index, Simpson index of diversity, and Equitability Index on the PAST Program. Results showed that both locations had a

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Thoudam, Depiya, N. Rikesh, A. Radhapyari Devi, and H. Manoranjan Sharma. "Phytosociological Studies of the Flora of Dhanamanjuri University Campus in Imphal West District (Manipur), India." International Journal of Plant & Soil Science 36, no. 6 (2024): 520–32. http://dx.doi.org/10.9734/ijpss/2024/v36i64654.

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Aims: To study the life forms and biological spectrum of the vegetation of Dhanamanjuri University Campus, Manipur to determine its phytoclimate and species diversity. Study Design: The vegetation of the whole university campus was studied and the site selection was made randomly. Place and Duration of Study: Dhanamanjuri University Campus is located at the intersection of 24.82ºN Latitude and 93.94ºE Longitude. The study was carried out from March to September, 2023. Methodology: Life forms were determined in the study area after detailed floristic studies. Vegetation classification on a phys

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Sidra, Altaf. "Diversity of freshwater fishes in Poonch River Mahseer National Park, Azad Jammu and Kashmir, Pakistan." Journal of Wildlife and Ecology 5, no. 1 (2021): 26–31. https://doi.org/10.5281/zenodo.4587802.

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The Azad Jammu and Kashmir is an area of high biodiversity, but very little is known about diversity of freshwater species. This research is conducted to examine the fish diversity of Poonch River Mahseer National Park, situated in Azad Jammu and Kashmir, Pakistan. The surveys are conducted from March 2020 to December 2020. Total 33 species are documented from Poonch River Mahseer National Park. Diversity indices showed that fish diversity of the Poonch river is rich (i.e. Richness, 7.203) and diverse, (i.e. Shannon-Weiner index =3.293, Simpson index=0.955). Evenness (i.e. 0.8161) is documente

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Mbelede, K. C., Akunne, C. E., Ononye, B. U., et al. "Diversity of Insects of Two Rice (Oryza sativa L. 1787) Farms in Nnamdi Azikiwe University, Awka, Nigeria." Asian Journal of Biology 19, no. 3 (2023): 44–56. http://dx.doi.org/10.9734/ajob/2023/v19i3371.

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The recognition of insect-related damages to rice plants and the subsequent consequences for biodiversity have shown the relevance of insect communities in rice farms. This study documented the insect fauna of rice (Oryza sativa L. 1787) in two rice farms in Nnamdi Azikiwe University, Awka, Nigeria from September to November, 2022. The insects associated with the two sites were collected using handpicking, sweep net, water trap and pitfall trap methods. Data collected from the study were subjected to non-parametric t- test at 5% significant level. A total of 51,021 insects belonging to twelve

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Yadav, Anisha, Oinam Hemlata Devi, and Pulak Das. "Public Perception of Urban Green Spaces and its Tree Diversity in Delhi." Nagarlok 56, no. 2 (2024): 196–212. http://dx.doi.org/10.32381/nl.2024.56.02.5.

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The relationship between man and nature plays an important role in the everyday lives of human societies. Places like Delhi and its people face major challenges and issues of urbanisation affecting their health and well-being. Urban greens such as parks play a major role in bringing greenness into the lives of urban dwellers. Trees are seen as a major green component in the urban greens. This paper attempts to understand how public sees green spaces and their uses. Tree diversity index (The Shannon Index also known as Shannon Weiner Index, is a statistical index that measures diversity by esti

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Rosi, M. Bernath, T. Sivaruban, Srinivasan Pandiarajan, S. Barathy, and Rajasekaran Isack. "Diversity and community structure of Ephemeroptera, Plecoptera and Trichoptera insects in Kolli hills of the Eastern Ghats, India." ENTOMON 47, no. 4 (2022): 457–62. http://dx.doi.org/10.33307/entomon.v47i4.802.

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The study describes the diversity and community structure of Ephemeroptera, Plecoptera and Trichoptera (EPT) taxa present in the Puliyancholai stream of the Kolli hills, Eastern Ghats. During the six months of study 397 specimens from 11 genera under seven families were collected. Ephemeroptera was the most dominant species followed by Trichoptera and Plecoptera. Various alpha biodiversity indices showed that the Simpson’s index was maximum in October (0.878) and minimum in December (0.832). The Shannon-Weiner index was maximum in December (2.277) and minimum in January (2.151). Evenness index

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Deka, Upen, and Tapan Dutta. "Ecological investigation of Urpad beel: A major wetland of Goalpara district of Assam, India." Annals of Plant Sciences 7, no. 4 (2018): 2112. http://dx.doi.org/10.21746/aps.2018.7.4.7.

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The present investigation deals with the ecological study of Urbad beel of Goalpara district of Assam with reference to aquatic plant community. The study was carried out during the year 2016 to 2017. Diversity indices viz. Shannon-Weiner diversity index, Simpson diversity index, Menhinick diversity index and Concentration of dominance were calculated to show the plant community structure of the wetland. A total of 93 aquatic macrophytic plant species belonging to 74 genera and 45 families have been reported from the wetland. Based on IVI value, Eichhornia crassipes was the most dominant speci

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Neupane, Prashant, and Indra Prasad Subedi. "Ant diversity in Muhan Pokhari area of Shivapuri-Nagarjun National Park, Nepal." Journal of Natural History Museum 30 (December 1, 2018): 180–91. http://dx.doi.org/10.3126/jnhm.v30i0.27554.

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Ant diversity was studied in Muhan Pokhari area of Shivapuri-Nagarjun National Park (SNNP)at 1,700 m to 1,900 m asl during winter and summer seasons of 2017. Ants were collected using pitfall traps, leaf litter sampling, bait and hand collection methods along a transect of50 m in each of all 5 sites (1,700 m, 1,750 m, 1,800 m, 1,850 m and 1,900 m). Altogether 817individual ants were collected representing 5 sub-families, 16 genera and 23 morpho species. Formicinae (57.67%) was the most abundant sub-family, followed by Myrmicinae (40.39%), Pseudomyrmicinae (0.8%), Ponerinae (0.73%) and Dolichod

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