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Are Morphometrical Approaches Appropriate to Establish Size at Maturity for Male American Lobster, Homarus Americanus ?

Are Morphometrical Approaches Appropriate to Establish Size at Maturity for Male American... 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 log-linear transformations and bivariate allometric plots as well as by multivariate Principal Components Analysis (PCA) in order to verify the validity of this approach for determining size at maturity. These analyses showed that onset of maturity cannot be detected efficiently by claw morphometry because this secondary sexual character gradually changes from early juvenile stages, contrary to what has been believed. Observation of the presence of spermatozoa in the vasa deferentia (gonadal maturity) showed that 50% gonadal maturity occurred 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. Therefore, further studies are needed to assess the behavioral maturity to determine the size at maturity for male lobsters. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Crustacean Biology Brill

Are Morphometrical Approaches Appropriate to Establish Size at Maturity for Male American Lobster, Homarus Americanus ?

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Copyright
The Crustacean Society
Subject
CONTENTS
ISSN
0278-0372
eISSN
1937-240X
DOI
10.1163/20021975-99990185
Publisher site
See Article on Publisher Site

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 log-linear transformations and bivariate allometric plots as well as by multivariate Principal Components Analysis (PCA) in order to verify the validity of this approach for determining size at maturity. These analyses showed that onset of maturity cannot be detected efficiently by claw morphometry because this secondary sexual character gradually changes from early juvenile stages, contrary to what has been believed. Observation of the presence of spermatozoa in the vasa deferentia (gonadal maturity) showed that 50% gonadal maturity occurred 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. Therefore, further studies are needed to assess the behavioral maturity to determine the size at maturity for male lobsters.

Journal

Journal of Crustacean BiologyBrill

Published: Jan 1, 2001

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