A comparative study of the morphology, distribution and ecology of Amblystegium tenax and A-fluviatile in Belgium.

Citation
A. Vanderpoorten et A. Empain, A comparative study of the morphology, distribution and ecology of Amblystegium tenax and A-fluviatile in Belgium., BELG J BOT, 132(1), 1999, pp. 3-12
Citations number
31
Language
FRANCESE
art.tipo
Article
Categorie Soggetti
Plant Sciences
Journal title
BELGIAN JOURNAL OF BOTANY
ISSN journal
0778-4031 → ACNP
Volume
132
Issue
1
Year of publication
1999
Pages
3 - 12
Database
ISI
SICI code
0778-4031(1999)132:1<3:ACSOTM>2.0.ZU;2-T
Abstract
A revision of the Belgian material of Amblystegium fluviatile and A. tenax was undertaken. A determination key and distribution maps are provided. A. fluviatile was observed in 158 IFBL squares, A. tenax in 87. The most impor tant distribution area of A. fluviatile are the phytogeographical districts "Ardennais" and "Mosan", that of A. tenax is the "Mosan". Both are rare in the other districts and absent from the "Maritime". 3/4 of the observation s of these two species were made after 1980. A. fluviatile grows in waters less rich in dissolved minerals (median of the observations of total hardne ss of about 30 degrees F in A. tenax and 10 degrees F in A. fluviatile), of lower trophic level (median of the observations of N-NH4+ concentrations o f ca 0.25 mg/l in A. tenax and of about 0.09 mg/l in A. fluviatile) and les s loaded in heavy metals (median of the observations of Zn concentrations o f about 100 mu g/l in A. tenax and of about 25 mu g/l in A. fluviatile). Bo th species include populations exhibiting a large tolerance to water pollut ion. A. tenax and A. fluviatile were found in rivers with maxima of N-NH4up to 9 and 6 mg/l, respectively. The polluo-tolerance of these species and their spread in Belgium are discussed.