Are morphometrical approaches appropriate to establish size at maturity for male American lobster, Homarus americanus?

Citation
Gy. Conan et al., Are morphometrical approaches appropriate to establish size at maturity for male American lobster, Homarus americanus?, J CRUS BIOL, 21(4), 2001, pp. 937-947
Citations number
39
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Aquatic Sciences
Journal title
JOURNAL OF CRUSTACEAN BIOLOGY
ISSN journal
0278-0372 → ACNP
Volume
21
Issue
4
Year of publication
2001
Pages
937 - 947
Database
ISI
SICI code
0278-0372(200111)21:4<937:AMAATE>2.0.ZU;2-T
Abstract
Study on the size at maturity of male American lobster (Homarus americanus) has traditionally been done based on a linear relationship between chelae size vs. body size assuming that a sharp change in slope occurs at onset of maturity. We analyzed this sexual dimorphism by standard loglinear transfo rmations and bivariate allometric plots as well as by multivariate Principa l Components Analysis (PCA) in order to verify the validity of this approac h for determining size at maturity. These analyses showed that onset of mat urity cannot be detected efficiently by claw morphometry because this secon dary sexual character gradually changes from early juvenile stages, contrar y to what has been believed. Observation of the presence of spermatozoa in the vasa deferentia (gonadal maturity) showed that 50% gonadal maturity occ urred at 49.8 mm of carapace length for male lobster from the southern Gulf of St. Lawrence. However, gonadal maturity does not necessarily correspond to the ability to mate (behavioral maturity) in many crustacean species. T herefore, further studies are needed to assess the behavioral maturity to d etermine the size at maturity for male lobsters.