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Why is collinearity in ordination a problem?

1 message · Victoria June Ord

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Dear All
 
Looking at examples from Alain Zuur's 'Analysing Ecological Data'- it is apparent that collinearity is considered an issue in ordination.  Could someone explain why that is?
 
Also is this only the case with a particular format of variable i.e. ordinal but not quantative? 
Or only with unconstrained vs. constrained ordination?
 
Many thanks in advance
 
Victoria
 
Victoria. J. Ord
IRES 
School of Biology
Devonshire Building
Newcastle University 
NE1 7RU 
+44 (0191) 2464813