Multi-year observations on the gametogenic ecology of the Antarctic seastar Odontaster validus
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 Isl...
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Language: | English |
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2007
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Online Access: | https://eprints.soton.ac.uk/49923/ https://eprints.soton.ac.uk/49923/1/Grangeetal2007OdontaserRep.pdf http://www.springerlink.com/content/g69385143663v657/?p=52c6a771b99e4347984297087d87c90d&pi=2 |
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ftsouthampton:oai:eprints.soton.ac.uk:49923 2023-07-30T03:55:29+02:00 Multi-year observations on the gametogenic ecology of the Antarctic seastar Odontaster validus Grange, L.J. Tyler, P.A. Peck, L.S. 2007-11 text https://eprints.soton.ac.uk/49923/ https://eprints.soton.ac.uk/49923/1/Grangeetal2007OdontaserRep.pdf http://www.springerlink.com/content/g69385143663v657/?p=52c6a771b99e4347984297087d87c90d&pi=2 en eng https://eprints.soton.ac.uk/49923/1/Grangeetal2007OdontaserRep.pdf Grange, L.J., Tyler, P.A. and Peck, L.S. (2007) Multi-year observations on the gametogenic ecology of the Antarctic seastar Odontaster validus. Marine Biology, 153 (1), 15-23. (doi:10.1007/s00227-007-0776-z <http://dx.doi.org/10.1007/s00227-007-0776-z>). Article PeerReviewed 2007 ftsouthampton https://doi.org/10.1007/s00227-007-0776-z 2023-07-09T20:54:29Z 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. Electronic supplementary material The online version of this article (doi:10.1007/s00227-007-0776-z) contains supplementary material, which is available ... Article in Journal/Newspaper Adelaide Island Antarc* Antarctic British Antarctic Survey McMurdo Sound University of Southampton: e-Prints Soton Antarctic The Antarctic McMurdo Sound Rothera ENVELOPE(-68.130,-68.130,-67.568,-67.568) Adelaide Island ENVELOPE(-68.914,-68.914,-67.762,-67.762) Rothera Research Station ENVELOPE(-68.129,-68.129,-67.566,-67.566) Marine Biology 153 1 15 23 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
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. Electronic supplementary material The online version of this article (doi:10.1007/s00227-007-0776-z) contains supplementary material, which is available ... |
format |
Article in Journal/Newspaper |
author |
Grange, L.J. Tyler, P.A. Peck, L.S. |
spellingShingle |
Grange, L.J. Tyler, P.A. Peck, L.S. Multi-year observations on the gametogenic ecology of the Antarctic seastar Odontaster validus |
author_facet |
Grange, L.J. Tyler, P.A. Peck, L.S. |
author_sort |
Grange, L.J. |
title |
Multi-year observations on the gametogenic ecology of the Antarctic seastar Odontaster validus |
title_short |
Multi-year observations on the gametogenic ecology of the Antarctic seastar Odontaster validus |
title_full |
Multi-year observations on the gametogenic ecology of the Antarctic seastar Odontaster validus |
title_fullStr |
Multi-year observations on the gametogenic ecology of the Antarctic seastar Odontaster validus |
title_full_unstemmed |
Multi-year observations on the gametogenic ecology of the Antarctic seastar Odontaster validus |
title_sort |
multi-year observations on the gametogenic ecology of the antarctic seastar odontaster validus |
publishDate |
2007 |
url |
https://eprints.soton.ac.uk/49923/ https://eprints.soton.ac.uk/49923/1/Grangeetal2007OdontaserRep.pdf http://www.springerlink.com/content/g69385143663v657/?p=52c6a771b99e4347984297087d87c90d&pi=2 |
long_lat |
ENVELOPE(-68.130,-68.130,-67.568,-67.568) ENVELOPE(-68.914,-68.914,-67.762,-67.762) ENVELOPE(-68.129,-68.129,-67.566,-67.566) |
geographic |
Antarctic The Antarctic McMurdo Sound Rothera Adelaide Island Rothera Research Station |
geographic_facet |
Antarctic The Antarctic McMurdo Sound Rothera Adelaide Island Rothera Research Station |
genre |
Adelaide Island Antarc* Antarctic British Antarctic Survey McMurdo Sound |
genre_facet |
Adelaide Island Antarc* Antarctic British Antarctic Survey McMurdo Sound |
op_relation |
https://eprints.soton.ac.uk/49923/1/Grangeetal2007OdontaserRep.pdf Grange, L.J., Tyler, P.A. and Peck, L.S. (2007) Multi-year observations on the gametogenic ecology of the Antarctic seastar Odontaster validus. Marine Biology, 153 (1), 15-23. (doi:10.1007/s00227-007-0776-z <http://dx.doi.org/10.1007/s00227-007-0776-z>). |
op_doi |
https://doi.org/10.1007/s00227-007-0776-z |
container_title |
Marine Biology |
container_volume |
153 |
container_issue |
1 |
container_start_page |
15 |
op_container_end_page |
23 |
_version_ |
1772813692023341056 |