Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Astaxanthin in Calanus pacificus: Assessment of Pigment-Based Measures of Omnivory

Andrew R. Juhl, Mark D. Ohman and Ralf Goericke
Limnology and Oceanography
Vol. 41, No. 6 (Sep., 1996), pp. 1198-1207
Stable URL: http://www.jstor.org/stable/2838603
Page Count: 10
  • More info
  • Cite this Item
Astaxanthin in Calanus pacificus: Assessment of Pigment-Based Measures of Omnivory
Preview not available

Abstract

We investigated the suitability of the pigments astaxanthin and canthaxanthin as biomarkers for measuring the contribution of microzooplankton prey to copepod diets. Identification and quantification of pigments of the marine planktonic copepod Calanus pacificus and heterotrophic protists were made using reverse-phase HPLC with a photodiode array detector. Astaxanthin content in the body tissues of C. pacificus declined significantly within 2 h after the onset of starvation. The esterified and unesterified pigment fractions behaved differently, with the unesterified fraction initially increasing in starved animals. Tissue astaxanthin content of C. pacificus increased by 50% in 24 h when fed the cryptomonad alga Rhodomonas sp. Such rapid changes in copepod body tissue pigments in response to starvation of feeding would lead to large errors in pigment-based measures of omnivory. Furthermore, neither astaxanthin nor canthaxanthin could be detected in any extract of six species of cultured and one species of field-collected heterotrophic marine protists. Although a variety of carotenoids were found in protist extracts, no single pigment was common to all heterotrophic protists.

Page Thumbnails

  • Thumbnail: Page 
1198
    1198
  • Thumbnail: Page 
1199
    1199
  • Thumbnail: Page 
1200
    1200
  • Thumbnail: Page 
1201
    1201
  • Thumbnail: Page 
1202
    1202
  • Thumbnail: Page 
1203
    1203
  • Thumbnail: Page 
1204
    1204
  • Thumbnail: Page 
1205
    1205
  • Thumbnail: Page 
1206
    1206
  • Thumbnail: Page 
1207
    1207