Abstract:
:Pither & Aarssen (2005) propose a null model approach to assess the proportion of niche specialist taxa along ecological gradients. They apply this methodology to a large data set of lacustrine diatom assemblages and conclude that a majority of the taxa are generalists on a pH gradient. This conflicts with previous work, which shows that many diatom taxa have a statistically significant relationship with pH. We demonstrate the methods used by Pither & Aarssen (2005) have a high Type II error for rare taxa, and that this problem is compounded by the non-uniform sampling of the pH gradient which effectively precludes acid-lake specialist diatoms from being recognized as such. We re-analyse the data used by Pither & Aarssen (2005) and show that most of the diatoms have a statistically significant relationship with pH, and we thus refute their conclusions that few diatom species are specialists.
journal_name
Ecol Lettjournal_title
Ecology lettersauthors
Telford RJ,Vandvik V,Birks HJdoi
10.1111/j.1461-0248.2005.00875.xsubject
Has Abstractpub_date
2006-04-01 00:00:00pages
E1-5; discussion E6-12issue
4eissn
1461-023Xissn
1461-0248pii
ELE875journal_volume
9pub_type
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