cluster - Multivariate analysis Prof dr Ann Vanreusel...

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Multivariate analysis Prof dr Ann Vanreusel - Similarity (resemblance) - Clusteranalysis
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http://www.primer-e.com/ Contact Cathy at [email protected] or fax: +44 1752 837721. £240 (to £600) - - Upgrade v5 to v6 for 10 classroom seats £240 (to £600) - - Each additional 10 classroom seats v6 £440 (to £800) - - Teaching licence 4 : 10 classroom seats v6 £140 £210 £280 Upgrade v5 to v6 £280 £420 £560 Single user licence 2 : New v6 licence University licence (academic research & teaching use only) 3 Public sector licence (government research lab, museum, agency, not-for-profit organisation etc) Private sector licence (commercial corporation, consultancy etc) Prices (GB pounds, £) 1
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Gradients Î gradual changes (transition) Î Environmental conditions Î Fauna and flora Intertidal Beach gradient
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Gradients Î gradual changes (transition) Î Environmental conditions Î Fauna and flora Intertidal mudflat gradient
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¾ Why to use multivariate statistics ? site1 site2 site 3 site 4 site 5 s p e c i e s a 24100 s p e c i e s b 31100 s p e c i e s c 55221 s p e c i e s d 00346 s p e c i e s e 00152 1 2 3 4 5 Upper beach community Lower beach community Gradient in species composition Gradient in environment
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site1 site2 site 3 site 4 site 5 p e c i e s a 24100 p e c i e s b 31100 p e c i e s c 55221 p e c i e s d 00346 p e c i e s e 00152 ¾ Why to use multivariate statistics ? 1 2 3 4 5 ± To analyse the structure of large datasets with many variables ± Originally mainly used in ecology Î to look for correlation between community structure and environment Gradient in species composition Gradient in environment
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site1 site2 site 3 site 4 site 5 species a 2 4 1 0 0 species b 3 1 1 0 0 species c 5 5 2 2 1 species d 0 0 3 4 6 species e 0 0 1 5 2 ¾ Why to use multivariate statistics ? Conclusions : - High on the beach close to the vegetation, the present invertebrate community is different from the species association low on the beach near the waterline - Species a and b are characteristic for the upper beach, while species d and e are typical inhabitants for the water front line. - Species c is an indifferential (eurytopic) species and appears along the total gradient - In between, there is an intermediate (transition) community at site 3 -Species a, b are indicator species for the area with vegetation high on the beach -Species e and d are indicator species for the area largely inundated close to the water front line
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Input : taxonomic composition of different samples (sites, stations, times) Objectives – research questions : Which samples do have a (dis)similar composition of the present biological community ? To recognize (delineate) communities (over space or time) To identify gradients in communities (over space or time) To look for (cor)relations with environmental factors Which species (taxa) have a similar distribution (the same relation to the environment)?
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This note was uploaded on 05/28/2010 for the course WE BIBI010000 taught by Professor Marnikvuylsteke during the Spring '10 term at Ghent University.

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cluster - Multivariate analysis Prof dr Ann Vanreusel...

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