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.




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References
Arnaud PM (1974) Contribution a la bionomie marine benthique des regions antarctiques et subantarctiques. Téthys 6:467–653
Bosch I, Pearse JS, Basch LV (1990) Particulate food and growth of planktotrophic sea star larvae in McMurdo Sound, Antarctica. Antarctic J US 25:210–212
Bowden DA (2005) Benthic assemblage development and larval ecology of marine invertebrates at Adelaide Island, Antarctica. PhD thesis, The Open University
Brockington S, Peck LS, Tyler PA (2006) Gametogenesis and gonad mass cycles in the Antarctic echinoid Sterechinus neumayeri Polor Biol 17:465–468
Chiantore M, Cattaneo-Vietti R, Elia L, Guidetti M, Antonini M (2002) Reproduction and condition of the scallop Admussium colbecki (Smith 1902), the sea urchin Sterechinus neumayeri (Meissner 1900) and the sea-star Odontaster validus (Koehler 1912) at Terra Nova Bay (Ross Sea): different strategies related to inter-annual variations in food availability. Polar Biol 25:251–255
Clarke A, Harris CM (2003) Polar marine ecosystems: major threats and future change. Environ Conserv 30:1–25
Dayton PK, Robilliard GS, Paine RT (1974) Biological accommodation in the benthic community at McMurdo Sound, Antarctica. Ecol Monogr 44:105–128
Dearborn JH (1965) Ecological and faunistic investigations of the marine benthos at McMurdo Sound, Antarctica. PhD thesis, Stanford University
Dearborn JH (1977) Foods and feeding characteristics of Antarctic asteroids and ophiuroids. In: Llano GA (ed) Adaptations within Antarctic ecosystems. Proceedings of the third SCAR symposium on Antarctic biology. Gulf Publishing, Texas
Farmanfarmaian A, Giese AC, Boolootian RA, Bennett J (1958) Annual reproductive cycles in four species of west coast starfish. J Exp Zool 138:355–367
Fowler J, Cohen L, Jarvis P (1998) Practical statistics for field biology. Wiley, Chichester
Grange LJ, Tyler PA, Peck LS, Cornelius N (2004) Long-term inter-annual cycles of the gametogenic ecology of the Antarctic brittle star Ophionotus victoriae. Mar Ecol Prog Ser 278:141–155
Grant A, Tyler PA (1983a) The analysis of data in studies of invertebrate reproduction. I. Introduction and statistical analysis of gonad indices and maturity indices. Int J Invert Reprod 6:259–269
Grant A, Tyler PA (1983b) The analysis of data in studies of invertebrate reproduction. II. The analysis of oocyte size/frequency data, and comparison of different types of data. Int J Invert Reprod 6:271–283
Koehler R (1912) Echinoderms, report of the 11th expedition Antarct Francise. Mason et Cie, Paris
Manabe S, Stouffer RJ (1979) A CO2- climate sensitivity study with a mathematical model of the global climate. Nature 282:491–493
Mauzey K (1966) Feeding behaviour and reproductive cycles in Pisaster ochraceus. Biol Bull 131:127–144
McClintock JB, Pearse JS, Bosch I (1988) Population structure and energetics of the shallow-water Antarctic seastar Odontaster validus in contrasting habitats. Mar Biol 99:235–246
Meidlinger K, Tyler PA, Peck LS (1998) Reproductive patterns in the Antarctic brachiopod Liothyrella uva. Mar Biol 132:153–162
Mortensen T (1927) Handbook of echinoderms of the British Isles. University Press, Oxford
Orejas C, López-González PJ, Gili JM, Teixidó N, Gutt J, Arntz WE (2002) Distribution and reproductive ecology of the Antarctic octocoral Ainigmaptilon antarcticum in the Weddell Sea. Mar Ecol Prog Ser 231:101–114
Pain SL, Tyler PA, Gage JD (1982a) The reproductive biology of the deep-sea asteroids Benthopecten simplex (Perrier), Pectinaster filholi (Perrier) and Pontaster tenuispinus (Düben & Koren) (Phanerozonia: Benthopectinidae) from the Rockall Trough. J Exp Mar Biol Ecol 65:195–211
Pain SL, Tyler PA, Gage JD (1982b) The reproductive biology in Hymenaster membranaceus from the Rockall Trough, Northeast Atlantic ocean, with notes of H. gennaeus. Mar Biol 70:41–50
Pearse JS (1965) Reproductive periodicities in several contrasting populations of Odontaster validus Koehler, a common Antarctic asteroid. Antarct Res Ser 5:39–85
Pearse JS (1966) Antarctic asteroid Odontaster validus: constancy of reproductive periodicities. Science 152:1736–1764
Pearse JS (1969) Slow developing demersal embryos and larvae of the Antarctic seastar Odontaster validus. Mar Biol 3:110–116
Pearse JS, Bosch I (1986) Are the feeding larvae of the commonest Antarctic asteroid really demersal? Bull Mar Sci 39:477–484
Pearse JS, Cameron RA (1991) Echinodermata: Echinoidea. In: Giese AC, Pearse JS, Pearse VB (eds) Reproduction of marine invertebrates VI echinoderms and lophophorates. The Boxwood Press, Pacific Grove, California, pp 514–662
Peck LS (2005) Prospects for survival in the Southern Ocean: extreme temperature sensitivity of benthic species. R Soc Spec Iss Antarct Sci 17:497–507
Peck LS, Webb KE, Bailey DM (2004) Extreme sensitivity of biological function to temperature in Antarctic marine species. Funct Ecol 18:625–630
Peck LS, Convey P, Barnes DKA (2006) Environmental constraints on life histories in Antarctic ecosystems: tempos, timings and predictability. Biol Rev 81:75–109
Powell DK (2001) The reproductive ecology of Antarctic free-spawning molluscs. PhD thesis, University of Southampton
Smale D, Barnes DKA, Fraser KPP (2007) The influence of depth, site exposure and season on the intensity of iceberg scouring in nearshore Antarctic waters. Polar Biol 30(6):769
Stanwell-Smith D (1997) Larval ecology of benthic marine invertebrates at Signy Island, Antarctica. PhD thesis, The Open University
Stanwell-Smith D, Clarke A (1998) Seasonality of reproduction in the cushion star Odontaster validus at Signy Island, Antarctica. Mar Biol 131:479–487
Stanwell-Smith D, Peck LS (1998) Temperature and embryonic development in relation to spawning and field occurrence of larvae of three Antarctic echinoderms. Biol Bull 194:44–52
Tyler PA, Reeves S, Peck LS, Clarke A, Powell D (2003) Seasonal variation in the gametogenic ecology of the Antarctic scallop Adamussium colbecki. Polar Biol 26:727–733
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.
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Communicated by J.P. Grassle.
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Grange, L.J., Tyler, P.A. & Peck, L.S. Multi-year observations on the gametogenic ecology of the Antarctic seastar Odontaster validus . Mar Biol 153, 15–23 (2007). https://doi.org/10.1007/s00227-007-0776-z
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DOI: https://doi.org/10.1007/s00227-007-0776-z


