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

THE ACTIVITY RHYTHM OF BERRIED AND UNBERRIED FEMALES OF NEPHROPS NORVEGICUS (DECAPODA, NEPHROPIDAE)

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

Females of the Norway lobster, Nephrops norvegicus are usually excluded from behavioural research based on the assumption that their reproductive cycle alters the results. A seasonal fluctuation in the sex ratio of commercial catches suggests that females do not emerge from their burrows when berried. Burrow emergence (i.e., catches) and feeding rhythms of berried and unberried females were compared with data on their endogenous locomotor activity rhythm. Catch data and the percentage of empty stomachs already published for a population dwelling on the continental slope (400-430 m) in the western Mediterranean were reprocessed focusing on data for berried and unberried females in October, a month that falls within the breeding season of N. norvegicus in the study area. Catches for both groups significantly increased at daytime, when both displayed the lowest percentages of empty stomachs (i.e., diurnal feeding pattern). To assess the occurrence of alterations in endogenous locomotor patterns depending on the presence of eggs, locomotor rhythms of berried and unberried females were studied under conditions of constant darkness in the laboratory. All individuals showed endogenous circadian and nocturnal locomotion. Taken together, these data suggest that feeding, burrow emergence, and endogenous locomotion rhythms are not inhibited in berried females. A reduction in the duration and range of emergence (i.e., doorkeeping) is hypothesized as the basis for the reported fluctuations in the sex ratio in commercial catches.

Affiliations: 1: Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta 37-49, E-08003 Barcelona, Spain;.932309555;, Fax: +34, Email: jaguzzi@cmima.csic.es; 2: Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta 37-49, E-08003 Barcelona, Spain

Sign-in

Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Create email alert
  • 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