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Titre du document / Document title

Molting and Growth in Relation to Form Alternations in the Male Spiny-Cheek Crayfish Orconectes limosus

Auteur(s) / Author(s)

BURIC Miloš ; KOUBA Antonin ; KOZAK Pavel ;

Résumé / Abstract

Morphological changes associated with form alternations in the male spiny-cheek crayfish Orconectes limosus are described with new findings and explanations of existing equivocalness. Males were observed for 10 mo (from Feb. to Nov. 2008). Most males (84.4%) underwent 2 molts, with a 1 mo interval between molts. A small proportion (8.9%) (with a higher initial size than those that molted twice) molted once, without a form alternation. A smaller proportion (6.7%) (with a higher initial size than those that molted either once or twice) did not molt at all. Molting began after water temperatures were at least 16°C for 2 mo. Form I gonopods were longer, wider, and more robust than form II gonopods, which were similar to those of juveniles, in addition to possessing wider protopodites and shorter endopodites. Chelae of form I males were longer and wider than those in form II males. Juveniles had shorter and narrower chelae. The chelae and abdomen of form I males were more robust than those of form II males and juveniles, which did not differ. A change of body ratios did not occur in crayfish which molted once without a form alternation. Negative allometric growth of chela length (ChL) and width (ChW), and abdominal width (AbW) was observed after the molt in form II. The body size increased more at the 1st molt (to form II), than at the 2nd molt back to form I. ChL, ChW, and weight (W) increments were 3 (ChL) and 4 times (ChW and W) that of body-size increments and were dramatically higher than at the previous molt. Form alternation seemed to have a function of allowing the effective utilization of resources through which males could increase in size and be attractive to females.

Revue / Journal Title

Zoological studies    ISSN  1021-5506 

Source / Source

2010, vol. 49, no1, pp. 28-38 [11 page(s) (article)]

Langue / Language


Editeur / Publisher

Academia Sinica, Taipei, TAIWAN, PROVINCE DE CHINE  (1994) (Revue)

Mots-clés d'auteur / Author Keywords

Invasive species




Intra-sex dimorphism




Localisation / Location

INIST-CNRS, Cote INIST : 14980, 35400018183765.0050

Nº notice refdoc (ud4) : 22507775

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