I am doing a study focusing on analyzing differences in fish assemblages due to temperature extremes. I calculated Shannon diversity, evenness, richness, and total abundance for each year sampled. The years are grouped into 2 temperature periods essentially as well, which is what I want to overall compare.
On viewing results, there appears to be consistency across years, and when comparing the two groupings. I do have multivariate tests to follow this after for community composition, but when describing univariate results, are there any statistical tests that can be followed up with to better show there is no difference, rather than simply describing the numbers and their mean differences?
Hi Alana Barton It would be good to have more information here to be able to help more, but have you tried a GLM with both years and temperatures included in the model? Perhaps you'd also need to add an interaction effect between temperature and year (as from what you said there's seems to be an interaction). Further explanatory variables could be added to the model if you have measured them.
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