Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2024-12-28T17:08:16.102Z Has data issue: false hasContentIssue false
  • English
  • Français

Geographical variations in carbon and nitrogen stable isotope ratios in squid

Published online by Cambridge University Press:  01 August 2000

Noriyuki Takai ,
Sayaka Onaka ,
Yuzuru Ikeda ,
Akihiko Yatsu ,
Hideaki Kidokoro  and
Wataru Sakamoto
Noriyuki Takai
Affiliation:
Center for Ecological Research, Kyoto University, Otsu 520-2113, Japan Chugoku National Industrial Research Institute, Agency of Industrial Science and Technology, Kure 737-0197, Japan. E-mail: takai@cniri.go.jp
Sayaka Onaka
Affiliation:
Center for Ecological Research, Kyoto University, Otsu 520-2113, Japan Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
Yuzuru Ikeda
Affiliation:
Center for Ecological Research, Kyoto University, Otsu 520-2113, Japan Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan Brain Science Institute, The Institute of Physical and Chemical Research (RIKEN), Wako 351-0198, Japan.
Akihiko Yatsu
Affiliation:
Center for Ecological Research, Kyoto University, Otsu 520-2113, Japan National Research Institute of Far Seas Fisheries, Fisheries Agency, Shimizu 424-8633, Japan
Hideaki Kidokoro
Affiliation:
Center for Ecological Research, Kyoto University, Otsu 520-2113, Japan Japan Sea National Fisheries Research Institute, Fisheries Agency, Niigata 951-8121, Japan
Wataru Sakamoto
Affiliation:
Center for Ecological Research, Kyoto University, Otsu 520-2113, Japan Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
Get access Rights & Permissions [Opens in a new window]

Abstract

The magnitude of geographical variations of stable isotope ratios of carbon and nitrogen was examined in ten squid species captured in seven areas of the world's oceans. The average of all 139 squid was −17.4±1.4‰ for δ13C and 11.6±1.6‰ for δ15N. The δ13C of squid showed a clear-cut negative correlation with the latitude of the sampling locations, reflecting the well-known latitudinal characteristics of phytoplankton δ13C, while squid δ,15N did not correlate with the latitude significantly. The δ15N reflected the regional characteristics of nitrogen metabolism such as denitrification and N2 fixation, and it was conspicuous in the intraspecific variation in Sthenoteuthis oualaniensis ranging from 10.0±1.5‰ off Japan to 16.3±0.6‰ off Peru in the Pacific Ocean. Significant isotopic variations were also found in the local area among the five species off Japan in the Pacific Ocean and among the three species in the Japan Sea. Attention must be paid to the isotopic variations of primary producers as well as those of squid in examining the trophic positions of squid.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 80 , Issue 4 , August 2000 , pp. 675 - 684
Copyright
2000 Marine Biological Association of the United Kingdom

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)