If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

Influence of physicochemical factors on the distribution and biomass of invasive mussels (Dreissena polymorpha and Dreissena bugensis) in the St. Lawrence River

$50.00 plus tax (Refund Policy)

Buy Article:

Abstract:

Twenty sites along the St. Lawrence River were sampled to determine if the distribution and abundance of invasive mussels (zebra mussel (Dreissena polymorpha) and quagga mussel (Dreissena bugensis)) are explained by physicochemical variables. Calcium concentration, substrate size, and depth independently explained significant proportions of variation in biomass for both species. Zebra mussel populations occurred at calcium levels as low as 8 mg Ca·L–1, but quagga mussels were absent below 12 mg Ca·L–1, suggesting that they have higher calcium requirements. Both species increased in biomass with increasing substrate size but displayed contrasting patterns with depth. Using combinations of these environmental variables, we developed stepwise multiple regression models to predict zebra mussel biomass and quagga mussel biomass. The zebra mussel model included calcium concentration, substrate size, and depth (r2 = 0.36, P < 0.0001), while the quagga mussel model included only substrate size and depth (r2 = 0.32, P < 0.0001). These results suggest that dreissenid mussel abundance (and correlated impacts) will vary predictably across environmental gradients, but the same predictive model will not be accurate for both species.

Nous avons échantillonné 20 sites le long du Saint-Laurent pour voir s'il est possible d'expliquer la répartition et l'abondance des moules envahissantes (la moule zébrée (Dreissena polymorpha) et la moule quagga (Dreissena bugensis)) d'après les variables physico-chimiques. Les concentrations de calcium, la taille du substrat et la profondeur expliquent de façon indépendante des portions importantes de la variation en biomasse des deux espèces. Les populations de moules zébrées se retrouvent à des concentrations de calcium aussi faibles que 8 mg Ca·L–1, mais les moules quagga sont absentes aux concentrations inférieures à 12 mg Ca·L–1, ce qui indique que ces dernières ont des besoins plus élevés en calcium. Les biomasses des deux espèces augmentent en fonction de la taille du substrat, mais elles suivent des patrons différents en fonction de la profondeur. En combinant ces variables du milieu, nous avons mis au point des modèles de régression multiple pas à pas pour prédire les biomasses des moules zébrées et des moules quagga. Le modèle des moules zébrées comprend les concentrations de calcium, la taille du substrat et la profondeur (r2 = 0,36, P < 0,0001) et celui de la moule quagga contient seulement la taille du substrat et la profondeur (r2 = 0,32, P < 0,0001). Ces résultats indiquent que l'abondance des bivalves dreissénidés et les impacts reliés varient de façon prédictive le long de gradients de l'environnement, mais qu'un même modèle prédictif ne peut être précis pour les deux espèces.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: September 1, 2005

More about this publication?
  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Terms & Conditions
  • Sample Issue
  • Reprints & Permissions
  • ingentaconnect is not responsible for the content or availability of external websites
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more