Are there hot spots for Elliptio complanata in the shallow littoral zone of a large Canadian Shield lake?

$50.00 plus tax (Refund Policy)

Buy Article:

Abstract:

The variability in habitat conditions in large lake basins may provide areas favourable for unionid recruitment and growth. Here we test whether the distribution, body size, and growth rate of Elliptio complanata differ between upwind and downwind sites in a 5.8 km long lake basin. We measured density and morphological characteristics of E. complanata at nine upwind and nine downwind sites. We also measured growth rates and stable isotope (13C, 15N) signatures at three upwind and three downwind sites. We found no difference in density or body size of E. complanata between upwind and downwind sites, despite clear differences in water temperature and food availability. Contrary to our expectations, the growth rate of E. complanata was higher (by 62%) at upwind sites. The reason for this difference is uncertain, but higher shell erosion and a negative relationship between 13C and C/N ratio suggest that E. complanata may be more stressed at downwind sites. The 15N of E. complanata did not differ systematically between upwind and downwind sites, but increased with increasing body size. It would therefore be prudent to standardize the size of E. complanata used to measure the baseline of lake food webs.

La variabilité des conditions d'habitat dans les grands bassins lacustres peut créer des zones favorables au recrutement et à la croissance des unionidés. Nous vérifions ici si la répartition, la taille corporelle et le taux de croissance d'Elliptio complanata diffèrent entre les sites au vent et les sites sous le vent dans un bassin lacustre de 5,8 km de longueur. Nous avons mesuré la densité et les caractéristiques morphologiques d'E. complanata à neuf sites au vent et à neuf sites sous le vent, de même que les taux de croissance et les signatures d'isotopes stables (13C, 15N) à trois sites au vent et trois sites sous le vent. Il n'y a pas de différence de densité ni de taille chez E. complanata entre les sites au vent et sous le vent, malgré des différences évidentes de température de l'eau et de disponibilité de nourriture. Contrairement à nos prévisions, le taux de croissance d'E. complanata est plus élevé (de 62 %) aux sites au vent. La raison de cette différence est incertaine, mais l'érosion plus grande de la coquille et la relation négative entre 13C et le rapport C/N laissent croire qu'E. complanata est peut-être plus stressé aux sites sous le vent. Il n'y a pas de différence systématique de 15N chez E. complanata entre les sites au vent et sous le vent, mais 15N augmente en fonction de la taille du corps. Il serait donc prudent de standardiser la taille d'E. complanata pour établir les valeurs de base danétude des réseaux trophiques des lacs.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: September 1, 2006

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