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

Diffusion of American lobster (Homarus americanus) in Northumberland Strait, Canada

$50.00 plus tax (Refund Policy)

Buy Article:

Abstract:

We tested the hypothesis that American lobster (Homarus americanus) movement can be described as diffusion. In 2001 and 2002, 3689 lobsters, captured by experimental trap and trawl surveys, were tagged and released in Northumberland Strait, Canada. Recaptures (n = 413) were reported by roughly 200 commercial fishermen, up to 3 years after release. Only six lobsters, all females, were recaptured more than once. Recapture rates were marginally higher for males (male 12%, female 10%) and varied with area of release (range: 5%–12%) and the fishing gear used for tagging (trap 12%, trawl 11%). Maximum and mean displacements between release and recapture were 58.3 and 12.3km, respectively. The positive linear correlation between mean square displacement (MSD) and time between release and recapture provides evidence for diffusion. We calculate a diffusion coefficient (D) of 13km2·week–1; there was no difference in D between sexes. A power analysis showed that MSD is underestimated at small sample sizes. There were insufficient data to test for differences in D associated with sexual maturity or shell hardness at time of release. During the summer in Northumberland Strait, the lobster population spreads about 20km. The demographic consequences of seasonal diffusion of lobster warrant study.

Nous évaluons l’hypothèse selon laquelle les déplacements du homard d’Amérique (Homarus americanus) peuvent être interprétés comme des diffusions. En 2001 et 2002, nous avons marqué et relâché 3689 homards capturés lors d’inventaires au casier expérimental et au chalut dans le détroit de Northumberland. Les recaptures (n = 413) ont été signalées par environ 200 pêcheurs commerciaux, jusqu’à 3 ans après la libération. Seuls six homards, tous femelles, ont été capturés plus d’une fois. Les taux de recapture étaient légèrement plus élevés chez les mâles (mâles 12%, femelles 10%) et variaient en fonction du point de libération (étendue: 5–12%) et l’engin de pêche utilisé lors du marquage (casier 12%, chalut 11%). Les distances maximale et minimale des déplacements entre la libération et la recapture étaient respectivement de 58,3 et 12,3 km. La corrélation linéaire positive entre le déplacement moyen au carré (MSD) et le temps entre la libération et la recapture est une indication de diffusion. Nous calculons que le coefficient de diffusion (D) est de 13km2·semaine–1, sans différence de D entre les sexes. Une analyse de puissance montre que MSD est sous-estimé dans les petits échantillons. Il n’y a pas suffisamment de données pour tester les différences de D associées à la maturité sexuelle ou à la dureté de la carapace au moment de la libération. Durant l’été dans le détroit de Northumberland, la population de homards s’étend d’environ 20 km. Il y aurait intérêt à étudier les conséquences de cette diffusion saisonnière des homards.

Document Type: Research Article

Publication date: April 1, 2009

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