Information

Ecological parameter:  longitudinal distribution according to Tachet

Parameter group: region related parameters

Explanation:
The trait describes the longitudinal distribution of aquatic invertebrates, ranging from the source (crenon) to the lower part of large rivers (metapotamon) and estuaries. Water bodies not directly connected to the main stream (e.g. lakes, ponds, pools, disconnected side-arms, marshes, temporary waters) are summarised in the "outside river system" category. Eight 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.

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	Abbreviation	Explanation
crenon	cr	spring region
epirithron	er	upper-trout region
metarithron	mr	lower-trout region
hyporithron	hr	grayling region
epipotamon	ep	barbel region
metapotamon	mp	bream region
estuary	est	brackish water region
outside river system	out	outside river system

Assigned taxa for each higher systematic unit

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