Contents
Academic literature on the topic 'Shannon index'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Shannon index.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Shannon index"
1
Tian, Yuan, та Gang Fu. "Quantifying Plant Species α-Diversity Using Normalized Difference Vegetation Index and Climate Data in Alpine Grasslands". Remote Sensing 14, № 19 (2022): 5007. http://dx.doi.org/10.3390/rs14195007.
Full textAbstract:
Quantitative plant species α-diversity of grasslands at multiple spatial and temporal scales is important for investigating the responses of biodiversity to global change and protecting biodiversity under global change. Potential plant species α-diversity (i.e., SRp, Shannonp, Simpsonp and Pieloup: potential species richness, Shannon index, Simpson index and Pielou index, respectively) were quantified by climate data (i.e., annual temperature, precipitation and radiation) and actual plant species α-diversity (i.e., SRa, Shannona, Simpsona and Pieloua: actual species richness, Shannon index, Simpson index and Pielou index, respectively) were quantified by normalized difference vegetation index and climate data. Six methods (i.e., random forest, generalized boosted regression, artificial neural network, multiple linear regression, support vector machine and recursive regression trees) were used in this study. Overall, the constructed random forest models performed the best among the six algorithms. The simulated plant species α-diversity based on the constructed random forest models can explain no less than 96% variation of the observed plant species α-diversity. The RMSE and relative biases between simulated α-diversity based on the constructed random forest models and observed α-diversity were ≤1.58 and within ±4.49%, respectively. Accordingly, plant species α-diversity can be quantified from the normalized difference vegetation index and climate data using random forest models. The random forest models of plant α-diversity build by this study had enough predicting accuracies, at least for alpine grassland ecosystems, Tibet. The proposed random forest models of plant α-diversity by this current study can help researchers to save time by abandoning plant community field surveys, and facilitate researchers to conduct studies on plant α-diversity over a long-term temporal scale and larger spatial scale under global change.
2
Levykh, Alyona Yuryevna, and Stepan Leonidovich Boldyrev. "Structure and factors of forest birds diversity forming in the Ishim river area (Russia)." Samara Journal of Science 7, no. 2 (2018): 81–87. http://dx.doi.org/10.17816/snv201872116.
Full textAbstract:
The paper studies the relationship between specific parameters of habitats (the forest area along the route, the average age of the forest, the closure of the crowns, the condition of the crowns, the type of anthropogenic impact, the stage of vegetative succession, the wetting of the forest), the abundance of birds, Shannon and Simpsons indices of the species diversity of forest ornithocenosis. This study is based on the materials of field bird records conducted in the seasons of 2014-2016 on 28 permanent routes in the forest habitats of the Ishim River area (Russia). A statistically significant effect of the anthropogenic impact on the Shannon diversity index and the significant influence of the plant succession stage on Shannons species diversity index and the abundance of birds have been established by the method of one-way analysis of variance using the nonparametric Kraskel-Walliss criterion. It is shown that the maximum value of Shannons index of variety is characteristic for the ornithocenosis of recreational forests; the one close to the maximum is in forests in which grazing is carried out. In the course of plant succession, there is initially an insignificant increase in the total abundance of birds, then a significant decrease in it, as well as a sharp decrease of Shannons diversity index. The obtained results show that the anthropogenic load in form of cattle grazing and recreation conditions an increase in forest habitats heterogeneity and thereby contributes to an increase in bird species diversity.
3
Fu, Yelin, Ming Wang, and Kin Keung Lai. "A Modified Nature Publishing Index via Shannon Entropy." Discrete Dynamics in Nature and Society 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/640924.
Full textAbstract:
This paper develops a Shannon Entropy approach based only on the number of papers published to propose scientific institution rankings. A simple and efficient approach with weight restrictions is employed to derive the score under specific preferences. The importance degrees for each preference are determined using the concept of Shannon Entropy. Finally, a weighted linear combination of different lexicographic preferences with subjective perceptions between the corrected count and the number of articles criteria is proposed. An application to Asia-Pacific ranking of the Nature Publishing Index is to illustrate the effectiveness of our proposed method.
4
Konopiński, Maciej K. "Shannon diversity index: a call to replace the original Shannon’s formula with unbiased estimator in the population genetics studies." PeerJ 8 (June 29, 2020): e9391. http://dx.doi.org/10.7717/peerj.9391.
Full textAbstract:
Background The Shannon diversity index has been widely used in population genetics studies. Recently, it was proposed as a unifying measure of diversity at different levels—from genes and populations to whole species and ecosystems. The index, however, was proven to be negatively biased at small sample sizes. Modifications to the original Shannon’s formula have been proposed to obtain an unbiased estimator. Methods In this study, the performance of four different estimators of Shannon index—the original Shannon’s formula and those of Zahl, Chao and Shen and Chao et al.—was tested on simulated microsatellite data. Both the simulation and analysis of the results were performed in the R language environment. A new R function was created for the calculation of all four indices from the genind data format. Results Sample size dependence was detected in all the estimators analysed; however, the deviation from parametric values was substantially smaller in the derived measures than in the original Shannon’s formula. Error rate was negatively associated with population heterozygosity. Comparisons among loci showed that fast-mutating loci were less affected by the error, except for the original Shannon’s estimator which, in the smallest sample, was more strongly affected by loci with a higher number of alleles. The Zahl and Chao et al. estimators performed notably better than the original Shannon’s formula. Conclusion The results of this study show that the original Shannon index should no longer be used as a measure of genetic diversity and should be replaced by Zahl’s unbiased estimator.
5
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.
Full textAbstract:
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 diversity (D) index was more suited for determining species diversity. The Shannon-Weiner index value calculated for different transects not only represent the species richness but also the species evenness in each transect. The potential application of forest diversity can be used a mechanism for forest management. The methodology will retrofit better policy implementation for maintaining the health of forest species in Mahavir Swami Wildlife Sanctuary and can be applied on other reserve forest of socio-ecological significance.
6
Kares, Yohaneta, Deidy Y. Katili, and Marnix L. Langoy. "Keanekaragaman Amphibi Di Areal Persawahan Kota Tondano Kabupaten Minahasa Provinsi Sulawesi Utara." Jurnal MIPA 8, no. 3 (2019): 135. http://dx.doi.org/10.35799/jmuo.8.3.2019.26158.
Full textAbstract:
Persawahan merupakan habitat yang baik bagi kehidupan amphibi. Amphibi memiliki fungsi ekologis sebagai penyeimbang ekosistem dan sebagai bioindikator lingkungan. Penilitian ini bertujuan untuk menganalisis keanekaragaman amphibi di areal persawahan Boleuvard Kota Tondano berdasarkan nilai indeks Shannon-Wiener. Penelitian ini menggunakan metode Line Transect yang dilaksanakan pada bulan Januari-Desember 2018. Nilai indeks keanekaragaman Shannon-Wiener pada transek satu H’ 0,782, transek dua H’1,208 dan transek tiga H’ 1,139. Berdasarkanhasilpenelitianterdapat lima spesies yang ditemukanya itu Bufo melanostictus, Rana cancrifora, Rana chalconota, Fejevarya limnocharis, dan Hylarana nicobariensis. Berdasarkan kategori indeks Shannon-wiener keanekaragaman amphibi di areal persawahan Tondano termasuk dalam kategori sedangRice fields are good habitat for amphibian life. Amphibians have an ecological function as a counterweight to ecosystems and as an environmental bioindicator. This research tries to analyze the amphibians in the Boleuvard rice field area of Tondano City based on the Shannon-Wiener index value. This study uses the Path Transect method which was carried out in January - December 2018. The index value of the Shannon-Wiener contribution to habitatone H '0,782, habitat two H'1,208 and habitat three H' 1,139. Based on the results of the study found five species found, namely Bufo melanostictus, Rana cancrifora, Rana chalconota, Fejevarya limnocharis, and Hylarana nicobariensis. Based on the Shannon-wiener index category the various amphibians in the Tondano rice field area are included in the medium category
7
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.
Full textAbstract:
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 index, Evenness Index (J), Shannon and Weaver diversity index (H), Simpson’s Index of Dominance (D) and phytoplankton,
8
NAYAK, Ananya, and Sunanda SASMAL. "Post-monsoon bird assemblages in rural and riverine environments of Northern Howrah, West Bengal, India: A spatio-temporal approach." Notulae Scientia Biologicae 14, no. 1 (2022): 11078. http://dx.doi.org/10.15835/nsb14111078.
Full textAbstract:
The primary goal of this study was to evaluate avian assemblages in four different land types (Wetland Associated Bamboo Forest, Agricultural Land, Wetland Associated Agricultural Land and Riverside Agricultural Land) located in a flood prone area of South Bengal during the post monsoon months of 2020. Surveys were conducted for 48 days in a land type and time dependent manner to explore the changes in abundance, dominance, evenness and species richness. A total of 18654 observations belonging to 16 orders, 44 families, 70 genera and 81 species were recorded. Despite having lowest total count and third species rich area, Bamboo Forest emerged as the most diverse area with the highest Shannon index (3.37), Evenness index (0.4616) and lowest dominance index (0.06108). Bamboo forests exhibited the maximum values of Simpson 1-D (0.9389), Brillouin index (3.312), Menhinick Index (1.261), Equitability (0.8134) and alpha diversity (Fisher’s alpha 11.74). Having maximum number of species occurrence (69), Riverside agricultural land was found to be the least diverse land type (Shannon index 2.847) showing highest value of dominance (0.1203). December attracted the most diverse (Shannon index 3.474) bird community and October showed the lowest value of Shannon index (2.919) with maximum value of dominance (0.123). We conclude that protection of natural habitats like bamboo forests, wetland and tree cover in small villages and proper management of agricultural lands is necessary for promoting species diversity and evenness in a rural environment.
9
Nielsen, Frank. "On a Variational Definition for the Jensen-Shannon Symmetrization of Distances Based on the Information Radius." Entropy 23, no. 4 (2021): 464. http://dx.doi.org/10.3390/e23040464.
Full textAbstract:
We generalize the Jensen-Shannon divergence and the Jensen-Shannon diversity index by considering a variational definition with respect to a generic mean, thereby extending the notion of Sibson’s information radius. The variational definition applies to any arbitrary distance and yields a new way to define a Jensen-Shannon symmetrization of distances. When the variational optimization is further constrained to belong to prescribed families of probability measures, we get relative Jensen-Shannon divergences and their equivalent Jensen-Shannon symmetrizations of distances that generalize the concept of information projections. Finally, we touch upon applications of these variational Jensen-Shannon divergences and diversity indices to clustering and quantization tasks of probability measures, including statistical mixtures.
10
Deksne, Rasma, Margarita Božko, Jekaterina Kuzmina, and Andris Linužs. "Ecological Quality Analysis of the Rezekne River after Zooplankton." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 1 (August 6, 2015): 17. http://dx.doi.org/10.17770/etr2013vol1.802.
Full textAbstract:
During seasonal studies 2012 (August/October), samples of zooplankton were collected and analyzed according standard method. Chemical quality of the Rezekne River's water investigated. Changes of quantitative and qualitative characteristics, saprobity index, species diversity (Shannon- Wiener index) and Renkonen index were employed for the analysis of zooplankton community structure in the Rezekne River. The Rezekne River saprobity varies from o – saprobity to β – mesosaprobity. The lowest ecological quality was determined in the leg of the Rezekne River in the territory of Rezekne city, which characterises with decrease in the total zooplankton abundance and species diversity according to Shannon - Wiener index, increase of saprobity.