Physical microhabitat requirements of freshwater pearl mussels, Margaritifera margaritifera (L.)

Citation
Lc. Hastie et al., Physical microhabitat requirements of freshwater pearl mussels, Margaritifera margaritifera (L.), HYDROBIOL, 429(1-3), 2000, pp. 59-71
Citations number
37
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Aquatic Sciences
Journal title
HYDROBIOLOGIA
ISSN journal
0018-8158 → ACNP
Volume
429
Issue
1-3
Year of publication
2000
Pages
59 - 71
Database
ISI
SICI code
0018-8158(200006)429:1-3<59:PMROFP>2.0.ZU;2-J
Abstract
The spatial distribution patterns of freshwater pearl mussels, Margaritifer a margaritifera (L.), in the River Kerry, north-western Scotland were inves tigated, together with their relationships to a number of physical paramete rs (distance from nearest bank, mean water depth, mean current velocity, su bstratum descriptors, aquatic vegetation cover). The mussels exhibited a hi ghly contagious, non-random spatial distribution pattern. Adult and juvenil e M. margaritifera were found to have broadly similar habitat 'preferences' , although adults were found over a wider range of physical conditions. Bas ed on computed habitat suitability curves, optimum water depths of 0.3-0.4 m and optimum current velocities of 0.25-0.75 ms(-1) at intermediate water levels were observed. River bed substratum characterisitics appear to be th e best physical parameters for describing M. margaritifera habitat. Boulder -stabilised refugia, which contain enough sand for burrowing, are ideal mic rohabitats for juvenile mussels. Adults are able to tolerate silty or muddy conditions for unknown lengths of time, but juveniles are never found in t his type of habitat. Substratum-based discriminant function models were use d to predict the presence or absence of mussels, with a success rate of 76- 92%.