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Marine Biology

, Volume 153, Issue 1, pp 15–23 | Cite as

Multi-year observations on the gametogenic ecology of the Antarctic seastar Odontaster validus

  • Laura J. Grange
  • Paul A. Tyler
  • Lloyd S. Peck
Research Article

Abstract

This study reports the first multi-year observations on the reproductive patterns for an Antarctic predator/scavenger, Odontaster validus (Koehler 1912). Seastars were collected monthly from a shallow site (15–20 m depth) near the British Antarctic Survey (BAS) Rothera Research Station (Adelaide Island, 67°34′S 68°08′W) from July 1997 to January 2001. Reproductive condition, oocyte size frequencies and spermatogenesis were examined in at least ten seastars each month using histological and image analysis techniques. Gonad indices (GI) and pyloric caeca indices (PI) were also examined in the same samples. Female and male GIs varied seasonally, in parallel with a reduction in the proportion of large oocytes and mature sperm in the gonad in August to mid-October following winter spawning. Despite there being remarkable consistency in the timing of spawning from year to year, differences in the reproductive condition of individuals were apparent. Patterns in the digestive tissues also varied with season, peaking in December and reaching a minimum in February in two of the three study years. This weaker annual pattern may partly reflect the varied diet of this predator/scavenger species, which is not directly dependant on the timing and magnitude of the annual phytoplankton bloom. Pooled oocyte size distributions and residual analysis suggested that oogenesis progressed over 18–24 months, with the largest of the two size classes (maximum diameter = 183 μm) being spawned annually. This pattern of oocyte growth and spawning was previously reported in the early 1960s for an O. validus population from McMurdo Sound, which lies south of Rothera by 10° latitude. The extremely catholic diet of this predator/scavenger suggests the reproductive patterns of the seastar will be less susceptible to changes in food supply compared to polar suspension feeders or deposit feeders.

Keywords

Reproductive Condition Reproductive Pattern Pyloric Caecum Gonad Index Oocyte Growth 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We wish to thank the British Antarctic Survey Rothera Dive Team for collecting O. validus and the marine assistants, A. Chapman, J. Beaumont and R. Piper for preserving specimens. Special thanks must also go to B. Murphy and A. Leach for completing a proportion of the required histology. We acknowledge grants to L.J.G. from the Natural Environmental Research Council (NER/S/A/2001/06366) and the Antarctic Funding Initiative through the Collaborative Gearing Scheme. Diving was also supported by the NERC National Diving Facility at Oban.

Supplementary material

227_2007_776_MOESM1_ESM.doc (6.2 mb)
Appendix 1 (DOC 6321 kb).
227_2007_776_MOESM2_ESM.doc (20 kb)
Appendix 2 (DOC 19 kb).
227_2007_776_MOESM3_ESM.doc (20 kb)
Appendix 3 (DOC 19 kb).
227_2007_776_MOESM4_ESM.doc (130 kb)
Appendix 4 (DOC 130 kb).

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Laura J. Grange
    • 1
  • Paul A. Tyler
    • 1
  • Lloyd S. Peck
    • 2
  1. 1.School of Ocean and Earth ScienceUniversity of Southampton, NOCSouthamptonUK
  2. 2.British Antarctic SurveyCambridgeUK

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