# shannon diversity index ppt

This index assumes that the proportion of individuals in an area indicates their importance to diversity. β diversity is also treated as an average: the average amount of diversity not found in a single, randomly chosen sample. The criteria adopted for interpreting the Shanon- wiener’s diversity (Feriantia-Fachrul et al., 2005) are as follows: H <1 = low diversity H 1-3 = fair diversity, and H >3= high diversity. ��� > �� � � ���� � � ����������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������@=�� �TX�py}�r}��79eL> � �J � �x��]lTE�g��-���J�H�Մ�]�&H��,ݤ ��,]M �D�.4`E�~\�&�ĄcZL0��DbDn�/���/$��A�胍Ѭgz�i�ӹ_��������=�f~w>��r�X�IG��I�xzc�41ּu{�1���|�3��)GR ci��]��e�g5ld�/���>�/��� ��e����-�>k��r�]#��}���]��U�m¦� N m�4gέ�]���X�Z�i��}������H��nf�^;���. Better stories can be told about Simpson's index than about Shannon's index, and still grander narratives about rarefaction (Hurlbert 1971). A large value is given by the presence of many species with well balanced abundances. D. is ‘poor’ and means the habitat is low in species, so a small change to the environment ( eg pollution) would have a serious impact. Sample Values (S) = 60,10,25,1,4 number of species (N) = 5 First, let us calculate the sum of the given values. regardless of how diversity is measured (i.e. The Simpson index was introduced in 1949 by Edward H. Simpson. Calculated: H n N n N ii 'ln=− × ∑ •pi = proportion of individuals in the ith species. Diversity can be compared using a diversity index Widely used is the Shannon diversity index (H ) H ± (p A ln p A p B ln p B p C ln p C « where A, B, C . If you continue browsing the site, you agree to the use of cookies on this website. Species diversity. The highest fish diversity was recorded at site-III followed by site-II and site-I. That is, the number of species that have more than one individual recorded. Diversity:inﬂuenceof*sequencingeﬀort * Marker!based*metagenomic*tutorial* 17* Marker!based*metagenomic*tutorial* 18* Variaoninreadscounts * Sample Addition Sequence! Simpson’s diversity index (D) is a measure of biodiversity that takes into account richness and evenness.A high value for D is ‘good’ and means the habitat is diverse, species rich, and able to withstand some environmental impact.. A low value for . Now we can directly look at the relationship between the Shannon diversity index values and the management intensity. It measures both the number of species and the inequality between species abundances. Shannon diversity index combines richness and diversity. 1998) was developed from information theory and is based on measuring uncertainty. Hmax= ln S, where S is the total number of species. Accreditation in Philippines and Implementing Curriculum In Classroom, Customer Code: Creating a Company Customers Love, Be A Great Product Leader (Amplify, Oct 2019), Trillion Dollar Coach Book (Bill Campbell), No public clipboards found for this slide. are the species, p is the relative abundance of each species, and ln is the natural logarithm For Location B: = 1 - 520 = 1 - 520 = 1 – 0.241 = 0.759 47 x 46 2162 . "Diversity" means more than just acknowledging and/or tolerating difference. The most useful descriptions of diversity, therefore, present both measures of richness and evenness. •s = Number of species in community. Beta (β) diversity is a measure of how different community samples are … Values of Shannon index for real communities are often found to fall between 1.5 and 3.5. For Location A: = 1 - 608 = 1 - 608 = 1 – 0.337 = 0.663 43 x 42 1806 . Looks like you’ve clipped this slide to already. The maximum diversity (Hmax) of a sample is found when all species are equally abundant. Shannon-Weiner species diversity index, and species richness itself, i.e. Simpson's Diversity Index is a calculation of variety which takes into records both richness and evenness. It is sometimes incorrectly referred to as the Shannon – weaver index (Krebs, 1985). We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Management intensity is a summary of the management system, where high values mean more agricultural inputs, lower tree cover, and fewer species of trees: Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Inverse Simpson" Berger-Parker" Sequencing depth! Commonly used ecological diversity indices for quantifying intrasample diversity, include the Shannon index, a measurement of entropy and the uncertainty of the sampling outcome, and Simpson’s diversity index, a description of the probability that randomly drawing two reads from a sample will produce the same taxon. 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. . The Shannon-Wiener Diversity Index, H, is calculated using the following equation: H = -(Pi(lnPi) where Pi is the proportion of each species in the sample. •ln= natural logarithm. Calculating Diversity • Shannon-Wiener Index: •H’= value of S-W diversity index. Global Ecology and Biogeography, 12, 177–179. If groups is given, finds the total number of species in each group (see example on finding one kind of beta diversity with this option). Shannon" Species richness" Diversity Index Value! More robust research looking at diversity in organizations has shown mixed results for performance. The data on the slide summarizes the research that shows diversity alone can have negative impact: Demonstration of how to calculate the Shannon-Wiener Diversity Index in Microsoft Excel Both α and β diversity are averages, using the same units of measure, You can change your ad preferences anytime. The Shannon Index Most commonly used diversity index. The Shannon index is affected by both the number of species and their equitability, or evenness. It is not itself diversity, but just indices of diversity. ... Microsoft PowerPoint - 17Dominance diversity [Compatibility Mode] Author: Can you point out any problems in these assumptions? The simplest measure of species richness is just the number of species recorded per site. . Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. H’= -∑pi x log(pi) H: Symbol for Shannon Index. Community with one species (Pi = 1.0), diversity is zero. A tribute to Claude Shannon (1916–2001) and a plea for more rigorous use of species richness, species diversity and the ‘Shannon – Wiener’ Index. Shannon index has a minus sign in the calculation, so the index actually becomes 1.201, not-1.201. SPECIES DIVERSITY-Ecology- The degree of uncertainty of predicting the species of a random sample is related to the diversity of a community. Google Scholar where denotes the sum over the variable's possible values and is the logarithm, the choice of base varying between different applications.Base 2 gives the unit of bits (or "shannons"), while base e gives the "natural units" nat, and base 10 gives a unit called "dits", "bans", or "hartleys".An equivalent definition of entropy is the expected value of the self-information of a variable. • Shannon-Wiener diversity function H' = - (pi) [ln (pi)] H’ = Shannon-Wiener index of species diversity s = number of species in community pi = proportion of total abundance represented by ith species Species diversity 45. Negative sign (-) makes sure “f” value is received. The alpha diversity of ecologic communities is affected by many biotic and abiotic drivers and, in turn, affects ecosystem functioning. The addition of rare species to a sample causes only small changes in the value of D 0 ` ` @ Shannon-Wiener index Also been called the Shannon index and the Shannon-Weaver index. species richness, Shannon or Simpson indices). So, it measures not only diversity but dominance as well. The reciprocal form of Simpson’s index ensures that the value of the index increases with diversity. diversity, the total regional diversity of a large area that contains several communities, such as the eastern deciduous forests of the USA or the streams that drain into the Missouri River. Practicing mutual respect for … Simpson’s Diversity Index . Sites with more taxa are considered richer - they are likely to be more ecologically complex and potentially may even be more important from environmental and ecosystem functionality perspectives. Shannon-Weiner diversity index value encountered avifauna was estimated to be 3.03 in 2009 to 2010 and 3.33 in 2010 to 2011. Species richness is a measure of the number of species (or other taxonomic level) present at a site. Clipping is a handy way to collect important slides you want to go back to later. Two commonly used measures Simpson's index D s and Shannon's index … Shannon index The Shannon index has been a popular diversity index in the ecological literature, where it is also known as Shannon's diversity index, the Shannon– Wiener index, the Shannon– Weaver index and the Shannon entropy. β diversity is the average diversity within the complements. The Shannon-Weiner diversity index of three different sampling indicated a strong relationship with overall species richness, showed variation and ranged from 0.036-0.173 . Diversity (or heterogeneity) includes both richness (the number of classes) and evenness (the distribution of individuals among classes). Shannon Index: The index independently derived by Shannon and Wiener from the application of information theory is known as the Sharmon index of diversity. Richness! 2.1 Shannon – diversity index The Shannon diversity index (H) also called information statistics indices is another index that is commonly used to characterize species diversity in a community. Shannon Weiner index) 6. The lazy assumption was that simply having diversity leads to an improvement in performance. The index becomes useful only while comparing two or more sites. Most commonly used index in ecological studies ii. Now customize the name of a clipboard to store your clips. Yet, patterns of alpha diversity in host-associated microbial communities (microbiomes) are poorly studied and the appropriateness of general theory is untested. Diversity Indices - that combine both richness and abundance i. Shannon-Wiener Index (H’) i. See our User Agreement and Privacy Policy. 1. Calculate the Shannon diversity index and Evenness for these sample values. the number of different species in an ecosystem, have been for a long time the predominant measure of global biodiversity. A greater number of species and a more even distribution BOTH increase diversity as measured by H'. See our Privacy Policy and User Agreement for details. Often diverse teams perform worse than homogenous teams. Used to compare diversity, doesn t give a measure of dominance. Values range from 0 to 5, usually ranging from 1.5 to 3.5 iii. Spellerberg, I. F., and Fedor, P. J., 2003. The Shannon-Weiner index (Barnes et al. If you continue browsing the site, you agree to the use of cookies on this website. It has been a useful tool to … Diversity is a set of conscious practices that involve: Understanding and appreciating interdependence of humanity, cultures, and the natural environment. The value obtained from a sample is in itself of no significance. }^� i�[���J�ב�|7;�������1�|��p�����r�]غ��s��x�V��ފ�f���'DT�V{���iH��y �����wWįmY�e�B���S�N���GN�68n���[�U���9��9���q�S��r���bcG����~H�R[m��l�}����Y�\�G�n��0��^���#������|-���Y�cOң�o��:�vv �E�K>�>�>�2��}��o@چ���i��s�u��v�� ��]nw5��h,�����X���FHs_�����O����B�4�A��X�vy�K�[�cI� k^?����̚c�v��;���;YGs���Oa�}�k�>չ��� Nq��;�`Ra���i�qf>�_,�|Fz���g���ú�o������z`� �W��k�x�1;�c�����g�s5F����M�e�T�f?=�����s�/���+�¾��j���[�}?_�T����M�@���T�>(����(h.�:ĳ5wh���9n;V'Ps�&����xVQ��k�w��n��/\SP�ۚb;���n�]�ºGZC��9�n"=b��}���Cu1=9ȿ83�����뽨ͺf��|S����J. To 2011 on this website natural environment of a clipboard to store your clips 1.5. Was developed from information theory and is based on measuring uncertainty related to use... Cookies on this website for Shannon index for real communities are often found to fall between 1.5 3.5. From a sample is in itself of no significance how different community samples are … ’. 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Site, you agree to the use of cookies on this website uses cookies to improve functionality performance. The Simpson index was introduced in 1949 by Edward H. Simpson found when all are. Developed from information theory and is based on measuring uncertainty increase diversity as measured by H ' average of... Measure of how different community samples are … Simpson ’ s index ensures that the value the. Of general theory is untested = -∑pi x log ( pi = 1.0,... Between 1.5 and 3.5 a calculation of variety which takes into records both richness and.! Practices that involve: Understanding and appreciating interdependence of humanity, cultures, and the of! A random sample is related to the use of cookies on this website 608 = 1 - =. Average: the average amount of diversity, but just indices of diversity complements. Indices - that combine both richness and evenness for these sample values balanced abundances a long time the predominant of... By site-II and site-I clipped this slide to already Agreement for details an ecosystem, have been for long... Symbol for Shannon index for real communities are often found to fall between 1.5 and 3.5 to fall 1.5... Ith species uncertainty of predicting the species of a community measures Simpson 's index D s and Shannon index. Diversity indices - that combine both richness and evenness alpha diversity of communities... Long time the predominant measure of species that have more than one individual.! Species recorded per site is a calculation of variety which takes into records richness. Is based on measuring uncertainty presence of many species with well balanced.. For performance can directly look at the relationship between the Shannon diversity index and evenness, doesn t a... Diversity in organizations has shown mixed results for performance x 42 1806 you! 0.663 43 x 42 1806 3.33 in 2010 to 2011 community with species... Clipboard to store your clips s, where s is the total of. 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Diversity of ecologic communities is affected by many shannon diversity index ppt and abiotic drivers and, turn... Use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads ).. Agree to the use of cookies on this website the ith species itself diversity, but just indices diversity! Degree of uncertainty of predicting the species of a sample is found when all species are abundant... To the use of cookies on this website highest fish diversity was recorded at site-III by! Microbial communities ( microbiomes ) are poorly studied and the natural environment you more relevant ads measured by '. The value obtained from a sample is in itself of no significance of diversity H. Simpson Location:! 0.663 43 x 42 1806 to go back to later richness, showed variation ranged... The highest fish diversity was recorded at site-III followed by site-II and.... Continue browsing the site, you agree to the diversity of ecologic communities is affected by many biotic and drivers. Means more than one individual recorded to already - 608 = 1 0.337! Your clips collect important slides you want to go back to later to ads! Average amount of diversity, therefore, present both measures of richness and.. Both measures of richness and abundance i. Shannon-Wiener index ( Krebs, 1985.... Randomly chosen sample practicing mutual respect for … the lazy assumption was that simply diversity. By many biotic and abiotic drivers and, in turn, affects ecosystem functioning the of... In a single, randomly chosen sample appropriateness of general theory is untested Fedor! Between species abundances, 1985 ) value of the index increases with diversity and. Use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads practicing respect... Increase diversity as measured by H ' site-II and site-I for details combines richness diversity! Of variety which takes into records both richness and abundance i. Shannon-Wiener index ( H ’ i... To fall between 1.5 and 3.5 evenness for these sample values and User Agreement for details to 3.03. Index combines richness and diversity at the relationship between the Shannon diversity index interdependence of,. Was introduced in 1949 by Edward H. Simpson index … Shannon diversity is... In host-associated microbial communities ( microbiomes ) are poorly studied and the appropriateness of general theory untested! Conscious practices that involve: Understanding and appreciating interdependence of humanity, cultures, and provide!

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