Skip navigation
SuUB logo
DSpace logo

  • Home
  • Institutions
    • University of Bremen
    • City University of Applied Sciences
    • Bremerhaven University of Applied Sciences
  • Sign on to:
    • My Media
    • Receive email
      updates
    • Edit Account details

Citation link: https://nbn-resolving.de/urn:nbn:de:gbv:46-diss000115923
00011592.pdf
OpenAccess
 
copyright

The Cephalopod Dosidicus gigas of the Humboldt Current System Under the Impact of Fishery and Environmental Variability


File Description SizeFormat
00011592.pdf5.57 MBAdobe PDFView/Open
Other Titles: Der Tintenfisch Dosidicus gigas des Humboldstromsystems unter dem Einfluss von Fischerei und Umweltvariabilität
Authors: Keyl, Friedemann 
Supervisor: Wolff, Matthias
1. Expert: Wolff, Matthias
Experts: Brey, Thomas
Abstract: 
Marine organisms are influenced by environmental variability and fishery and cephalopods are especially plastic in their response to exogenous factors. Underlying mechanisms of interactions are often unclear and complex. The ommastrephid jumbo squid (Dosidicus gigas) is an important component in the ecosystems of the Eastern Pacific Ocean and like other cephalopods rapidly changes abundances of its populations and their size structure. Results of the present work show that the morphological and life history traits of D. gigas respond highly variable to changing environmental conditions. Fishery impacts indirectly and rather positive through the reduction of competitors and predators. A synchronous change in the state of expression of traits occurred after the strong La Nina/El Nino-sequence 1996 to 1998. The elevated energetic requirements of the new states compared to those before the shift lead to the conclusion that the changes in traits follow an energy optimization strategy that allows jumbo squid to adjust to changing availability of prey and emphasize either in survival of the population or the increase of individual fitness.
Keywords: jumbo squid; Dosidicus gigas; environmental variability; population dynamics; population structure; life history traits; energy optimization strategy; fishery
Issue Date: 20-May-2009
Type: Dissertation
Secondary publication: no
URN: urn:nbn:de:gbv:46-diss000115923
Institution: Universität Bremen 
Faculty: Fachbereich 02: Biologie/Chemie (FB 02) 
Appears in Collections:Dissertationen

  

Page view(s)

398
checked on May 10, 2025

Download(s)

213
checked on May 10, 2025

Google ScholarTM

Check


Items in Media are protected by copyright, with all rights reserved, unless otherwise indicated.

Legal notice -Feedback -Data privacy
Media - Extension maintained and optimized by Logo 4SCIENCE