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Academic literature on the topic 'Shannon's Diversity Index'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 June 2025

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Journal articles on the topic "Shannon's Diversity Index"

1

Guiaşu, Radu Cornel, and Silviu Guiaşu. "Conditional and Weighted Measures of Ecological Diversity." International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 11, no. 03 (2003): 283–300. http://dx.doi.org/10.1142/s0218488503002089.

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Shannon's entropy and Simpson's index are the most used measures of species diversity. As the Simpson index proves to be just an approximation of the Shannon entropy, conditional Simpson indices of diversity and a global measure of interdependence among species are introduced, similar to those used in the corresponding entropic formalism from information theory. Also, since both the Shannon entropy and the Simpson index depend only on the number and relative abundance of the respective species in a given ecosystem, the paper generalizes these indices of diversity to the case when a numerical weight is attached to each species. Such a weight could reflect supplementary information about the absolute abundance, the economic significance, or the conservation value of the species.
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2

Cheng-Wen, Shen, Huang Yi-Huan, Huang Jian-An, Luo Jun-Wu, Liu Chun-Lin, and Liu De-Hua. "RAPD analysis on genetic diversity of typical tea populations in Hunan Province." Chinese Journal of Agricultural Biotechnology 5, no. 1 (2008): 67–72. http://dx.doi.org/10.1017/s147923620800199x.

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AbstractGenetic diversity and genetic variation of 240 adult plants of four tea populations in Hunan – Camellia sinensis var. sinensis, C. sinensis var. assamica cv. Duntsa, C. ptilophylla and C. sinensis var. assamica cv. Jianghua – were studied by rapid amplification of polymorphic DNA (RAPD) markers. The results showed 226 loci using 21 random primers (10 bp), of which 201 (88.9%) were polymorphic. The genetic diversity analysis indicated that Shannon's index was 0.43; 74.7% of which was within-population genetic diversity while 25.3% was among-population variation. The gene diversity indexes of total populations (HT), within populations (HS) and among populations (HST) were, respectively, 0.37, 0.28 and 0.09. The coefficient of gene differentiation (GST) among populations was 0.23, indicating a 76.7% variation within populations and 23.3% among populations. These results displayed a rich within-population genetic variation, as in Shannon's diversity index. Interpopulation gene flow (Nm) was 0.74, which indicates the limited genetic exchange between populations.
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3

Zhou, Ke, and Miao Miao Yan. "The Ineffectiveness of Landscape Diversity Index in Biocontrol: An Evidence from Small Scale Farmland." Applied Mechanics and Materials 295-298 (February 2013): 2675–78. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.2675.

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Landscape diversity index behaves ineffective in small scale farmland. The correlation coefficients between Shannon's diversity index as well as Simpson's diversity index with the population density of ladybeetles are negative. This result is opposite with the results from large scale farmland in developed countries. Landscape pattern has significant influence on the population density of ladybeetles. Especially the cotton/wheat relay intercrops have significant influence on the population density of ladybeetles. Besides grassland are also beneficial to the population density of ladybeetles.
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4

Łagód, Grzegorz, Mariola Chomczyńska, Agnieszka Montusiewicz, Jacek Malicki, and David Stransky. "Methods Applied for Measurement and Visualization of Changes in Biodiversity." Ecological Chemistry and Engineering S 21, no. 4 (2015): 593–604. http://dx.doi.org/10.1515/eces-2014-0042.

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Abstract The article presents the possible methods for determining biological or statistically significant differences between taxocenoses compared with respect to biodiversity. To obtain a complete description of biological differences between the compared hypothetical communities, the following indices were calculated: S (taxon richness), H (the Shannon index), Hmax (the maximum value of the Shannon index for the richness of taxa represented by the same number of individuals), Vd (a percentage value of covering the structural capacity of community, “evenness deficiency”), E (the MacArthur index - a taxon number (S) in a community for which the observed value of H equals Hmax), and Ps (a taxon richness shortage in percents). Moreover, a graphic profile method (Дд, Tj, and Lj profiles) was used for comparing the diversity of the communities. To obtain information about statistically significant differences in biodiversity between the analysed communities, rarefaction curves were applied. The curves are based on the null models and the Monte Carlo method. The rarefaction method resulted in determination of the statistical significance of the differences between taxon richness and Shannon's index values for the compared communities. The Vd and Ps indices and the profile method allowed concluding about the significance of the biological differences between taxocenoses, even when their values of Shannon's H indices were numerically similar.
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5

Lee, Tsung Hung. "Ecological patterns of distribution on gradients of elevation and species diversity of snakes in southern Taiwan." Amphibia-Reptilia 26, no. 3 (2005): 325–32. http://dx.doi.org/10.1163/156853805774408522.

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AbstractThe study was conducted in southern Taiwan, along a road traversing the study area from 287 to 1680 m a.s.l. from May to October 2003 to investigate the distribution patterns and species diversity of the snakes. A total of 69 individual snakes belonging to 16 species were recorded. The Shannon's index and evenness index of the full study area were 2.4337 and 0.8777, respectively. Moreover, evenness index was 401 to 700 m > 1001 to 1300 m > 701 to 1000 m > 1301 to 1600 m altitudinal zone. The Shannon's index, DMG, and the reciprocal form of the Berger-Parker index (1/d) were 1001 to 1300 m > 401 to 700 m > 701 to 1000 m > 1301 to 1600 m altitudinal zone. Thirty-seven snakes were found in natural forest, 12 in plantation forest, 8 in secondary forest, and 12 in agricultural lands. I concluded that the highest species richness and diversity are found in mid-altitudinal mountains in southern Taiwan.
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6

Beisel, Jean-Nicolas, and Jean-Claude Moreteau. "A simple formula for calculating the lower limit of Shannon's diversity index." Ecological Modelling 99, no. 2-3 (1997): 289–92. http://dx.doi.org/10.1016/s0304-3800(97)01954-6.

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7

Fang, Gang, Jian Yong Chen, Juan Yang, Qiang Zhao, and Hai Min Su. "Dynamic Changes Analysis of Dangshan Landscape Pattern." Advanced Materials Research 356-360 (October 2011): 2870–73. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.2870.

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The article takes 2 TM images as the data source, supported by the Fragstats 3.3 and the ENVI 4.7 softwares, two remote sensing images are classified by the support vector machine method, selects the number of patches (NP), edge density (ED), patches density (PD), landscape shape index (LSI), perimeter area fractal dimension (PAFRAC), interspersion juxtaposition index (IJI), patch cohesion index (COHESION), Shannon's diversity index (SHDI), Shannon's evenness index (SHEI) and contagion index (CONTAG), using the landscape ecological principles and methods, analyzes the dynamic changes of Dangshan landscape patter in 1987-2009, with a view to Dangshan county land resources of reasonable planning and using, management, sustainable utilization, and the landscape pattern optimization configuration, provides the theory foundation and scientific basis.
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8

Sari, Indah Fitri, Nuning Nurcahyani, M. Kanedi, and Tugiyono Tugiyono. "Bird Species Diversity in Liwa Botanical Garden, West Lampung." Jurnal Ilmiah Biologi Eksperimen dan Keanekaragaman Hayati 7, no. 1 (2020): 1–6. http://dx.doi.org/10.23960/jbekh.v7i1.5.

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The diversity of bird species can reflect the high biodiversity of an area. it means that birds can be used as a bio-indicator of environmental quality. Determining the quality and level ofenvironmental damage can be seen from the diversity of bird species in the region. Environmental quality will be better if the diversity of bird species in the region is diverse.Birds have an important role in protecting the ecosystem in the Liwa Botanical Garden. The presence of birds in the Liwa Botanical Garden has not been well identified. Therefore thisresearch needs to be done. This research was conducted on 12 October 2019 to 20 October 2019 in the Liwa Botanical Garden, West Lampung. Data collection of bird species isconducted in the morning at 06.30.00-08.30 West Indonesia Time and afternoon at 16.30-18.00 West Indonesia Time, with a combination of the count point and the transect method then all encounters with birds are recorded and identified directly at the study site. After the birds are identified, data is processed to find out Shannon's level index and diversity index. The species diversity index uses the Shannon and Weiner formula. The level of diversity is determined based on the species diversity index. The results showed that there were 15 bird species with a total of 466 individuals with a moderate diversity index and an evenness index indicating a distressed community.
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9

Holland, David N., Robert J. Lilieholm, David W. Roberts, and J. Keith Gilless. "Economic trade-offs of managing forests for timber production and vegetative diversity." Canadian Journal of Forest Research 24, no. 6 (1994): 1260–65. http://dx.doi.org/10.1139/x94-165.

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Three indices of forest stand structural and compositional diversity were incorporated into a linear programming timber harvest scheduling model to examine the trade-offs between managing stands for timber production and biodiversity objectives. The indices, based on Shannon's diversity index, characterized stand species diversity, basal area diversity, and vertical crown diversity. While harvest-level objectives were often compatible with the maintenance of vegetative diversity, the maximization of present net value was accompanied by substantial reductions in all three measures of diversity.
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10

Liang, Yu, Jian Liu, Shu Ping Zhang, Shu Jun Wang, Wei Hua Guo, and Ren Qing Wang. "Genetic diversity of the invasive plant Coreopsis grandiflora at different altitudes in Laoshan Mountain, China." Canadian Journal of Plant Science 88, no. 4 (2008): 831–37. http://dx.doi.org/10.4141/cjps07020.

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In order to understand the relationship between genetic diversity and the invasiveness of exotic plants, genetic diversity was studied in the invasive plant Coreopsis grandiflora Hogg. at different altitudes in Laoshan Mountain, Northern China. Coreopsis grandiflora has produced a great deal of damage in Laoshan Mountain. Its genetic diversity was examined using 16 random amplified polymorphic DNA (RAPD) primers, and 125 bands were collected from all individuals. The mean percentage of polymorphic loci (P%) was 39.54%, and the total percentage of polymorphic loci (P%) was 86.40%. The mean Shannon's Information index (H0) was 0.2326 and the mean Nei's genetic diversity (H) was 0.1596. These results indicated a comparatively high genetic diversity in C. grandiflora in Laoshan Mountain. The genetic differentiation among populations (GST) was 0.3948, indicating that most genetic diversity occurs within populations. On the whole, the abundance and the genetic diversity of C. grandiflora decreased with increasing altitude. The high genetic diversity may be related to the invasion of C. grandiflora in Laoshan Mountain. Key words: Biological invasions, Coreopsis grandiflora Hogg., genetic distance, genetic diversity, random amplified polymorphic DNA (RAPD), sexual reproduction, Shannon’s information index
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