Aquat. Living Resour.
Volume 11, Number 6, November 1998
|Page(s)||359 - 369|
|Published online||15 November 1998|
Application of Leslie's model on a population of common dolphins (Delphinus delphis): Sensitivity study
Ifremer, Centre de Brest, DRV/RH, B.P. 70, 29280 Plouzané, France
2 ENSA, Département halieutique, 65, rue de Saint-Brieuc, 35042 Rennes, France
Revised: June 1998
Accepted: 28 October 1998
The rapid development of the albacore tuna (Thunnus alalunga) driftnet fishery in the Bay of Biscay (Atlantic ocean, France) has incited European management authorities to ask for a study of its ecological impact on populations of common dolphins and striped dolphins. A programme with onboard observers has been led during 1992 and 1993, and a sighting survey has allowed the evaluation of the abundances of fractions of populations in the studied area. For the population of common dolphins, the biological parameter estimation has allowed the building of a discrete age-structured model based on a Leslie matrix. Sensitivity studies have been conducted using four model parameters (age of first reproduction, interval between births, juvenile and adult survival rates. Results show that the increase rate of the population presents the highest sensitivity versus adult survival rate and, in second place versus the interval between births.
Key words: Linear model / common dolphin / driftnet fishery / survival rate
© Elsevier, IRD, Inra, Ifremer, Cemagref, CNRS, 1998
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.