Ecological parameter: pH (preferendum) according to Tachet

Parameter group: habitat related parameters

Explanation:
This trait provides information on the tolerance of invertebrates to low pH values, describing their sensitivity to natural or anthropogenic stream acidification (e.g. the consequence of acid rain due to dissolved acidic gases - sulfur dioxic, nitrogen oxide - in rainwaters). Six categories are defined.

Tachet, H., Bournaud, M., Richoux, P. & Usseglio-Polatera, P. (2010): Invertébrés d'eau douce - systématique, biologie, écologie. CNRS Editions, Paris, 600 p.

Type of assignment: affinity score assignment system (0 to 3)
A description of the coding system can be found here  Abbreviations/Coding Systems

Additional information:
Note that several classifications of the Tachet database are on higher taxonomic level than on species level. To display them in the list please enable "include higher taxonomic units" in the "advanced search".

Abbreviations:

Category name:	Abbreviations:	Explanation:
<= 4	<= 4	pH less than 4
> 4 - 4.5	> 4-4.5	pH between 4 and 4.5
> 4.5 - 5	> 4.5-5	pH between 4.5 and 5
> 5 - 5.5	> 5-5.5	pH between 5 and 5.5
> 5.5 - 6	> 5.5-6	pH between 5.5 and 6
> 6	> 6	pH greater than 6

Assigned taxa for each higher systematic unit:

Taxagroup	Number of assigned taxa / total number of taxa - percentage
Bivalvia	3 / 77 - 3.8%
Bryozoa	6 / 19 - 31.5%
Coelenterata	2 / 13 - 15.3%
Coleoptera	52 / 2678 - 1.9%
Crustacea	11 / 270 - 4%
Diptera (excl. Chironomidae)	2 / 2404 - 0%
Ephemeroptera	16 / 353 - 4.5%
Gastropoda	15 / 241 - 6.2%
Heteroptera	10 / 124 - 8%
Hirudinea	10 / 68 - 14.7%
Kamptozoa	1 / 1 - 100%
Lepidoptera	4 / 19 - 21%
Nemertini	1 / 1 - 100%
Odonata	17 / 174 - 9.7%
Oligochaeta	16 / 240 - 6.6%
Planipennia	1 / 12 - 8.3%
Plecoptera	9 / 576 - 1.5%
Polychaeta	1 / 13 - 7.6%
Porifera	3 / 12 - 25%
Trichoptera	38 / 1439 - 2.6%
Turbellaria	4 / 61 - 6.5%