Cookies Policy
X
Cookie Policy

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

ECDYSONES IN THE MATURATIONAL MOULT OF JUVENILE FEMALES OF THE SPIDER CRAB, LIBINIA EMARGINATA LEACH, 1815 (DECAPODA, MAJIDAE)

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
MyBook is a cheap paperback edition of the original book and will be sold at uniform, low price.

Buy this article

Price:
$30.00+ Tax (if applicable)
Add to Favorites

image of Crustaceana

In this study we examined the role of ecdysteroids in the differentiational moult and in sexual maturation of juvenile female Libinia emarginata, using eyestalk ablation and radioimmunoassay. In eyestalk intact control animals, the ecdysteroids increased significantly in the hemolymph, from 11.26 ng/ml at the beginning of the experiment to 89.68 ng/ml by 68 days (7 days before moulting). In eyestalk ablated animals the ecdysteroids rose to 148.30 ng/ml by 20 days under our rearing conditions and moulting occurred 30 days after the beginning of the experiment. Ecdysteroids accumulated in the fresh ovaries prior to moulting, increasing from 30.38 ng/g at day 1 to 296.01 ng/g in control animals by day 73 (2 days prior to moulting). In ablated females they increased in a similar manner reaching 321.2 ng/g 10 days prior to moulting. All ablated juvenile females moulted into juveniles, while all controls moulted into adults. Our results suggest that in addition to regulating moulting, ecdysteroids may play a role in the morphological changes involved with maturation since eyestalk ablated animals remained juvenile. spider crabs has been related to degeneration of the Y-organs in species such as Maja squinado (Herbst, 1788) (cf. Carlisle, 1957) and Acanthonyx lunulatus (Risso, 1816) (cf. Chaix et al., 1976). Female spider crabs undergo a differentiational moult from the juvenile form to the adult, after which they become anecdysic. The morphology affected by the differentiational moult is the shape of the abdomen. In immature females the abdomen is narrow and does not completely cover the sternites; in adults it is broadly oval and completely covers the ventral surface between the walking legs. The maximum carapace length (CL) of immature females found in wild populations is 60 mm (15). Mature females exceed 40 mm CL, so, in the 40- 60 mm range, females may be mature or immature.

En este estudio se examino el rol de los ecdisteroides en la muda de diferenciacion y la maduracion sexual de las hembras juveniles de Libinia emarginata utilizando ablacion peduncular y radioinmunoensayo. En animales peduncularmente intactos o controles los ecdisteroides incrementaron significativamente en la hemolinfa, de 11.26 ng/ml al principio del experimento a 89.68 ng/ml a los 68 doas (7 d oas antes de mudar). En animales epedunculados los ecdisteroides alcanzaron 148.30 ng/ml tras 20 doas de cultivo y mudaron a los 30 d oas desde el inicio del experimento. Los ecdisteroides acumulados en los ovarios de animales controles antes de mudar, incrementaron de 30.38 ng/g el primer doa a 296.01 ng/g despu es de 73 doas de cultivo (2 d oas antes de mudar). En las hembras epedunculadas incrementaron de manera similar alcanzando 321.20 ng/g 10 doas antes de mudar. Todas las hembras juveniles epedunculadas mudaron en juveniles, mientras que todas las controles mudaron en adultos. Nuestros resultados sugieren que adem as de regular la muda, los ecdisteroides puden jugar un papel en los cambios morfologicos relacionados con la maduracion ya que los animales epedunculados permanecieron juveniles.

Loading

Article metrics loading...

/content/journals/10.1163/156854099503311
1999-03-01
2015-03-06

Sign-in

Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to email alerts
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Name:*
    Email:*
    Your details
    Name:*
    Email:*
    Department:*
    Why are you recommending this title?
    Select reason:
     
     
     
     
    Other:
     
    Crustaceana — Recommend this title to your library

    Thank you

    Your recommendation has been sent to your librarian.

  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation