Population structure and reproductive biology of Laetmonice producta Grube (Polychaeta, Aphroditidae) in Antarctic waters, and relationships with an endosymbiont polychaete.
The large scale-worm Laetmonice producta Grube 1877 is the most abundant aphroditid polychaete in Antarctic coastal waters. We investigated the demographic structure and some reproductive features of different L. producta populations from high-Antarctic (Weddell Sea) and Antarctic Peninsula (King Ge...
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ftunivsalento:oai:iris.unisalento.it:11587/104789 2024-04-21T07:52:46+00:00 Population structure and reproductive biology of Laetmonice producta Grube (Polychaeta, Aphroditidae) in Antarctic waters, and relationships with an endosymbiont polychaete. MICALETTO G. GAMBI MC PIRAINO, Stefano MICALETTO G., GAMBI MC Piraino, Stefano 2003 STAMPA http://hdl.handle.net/11587/104789 https://doi.org/10.1007/S00300-003-0482-3 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000183122000006 volume:26 firstpage:327 lastpage:333 numberofpages:7 journal:POLAR BIOLOGY http://hdl.handle.net/11587/104789 doi:10.1007/S00300-003-0482-3 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0038275757 Polychaete REPRODUCTION LAETMONICE SCALE WORMS info:eu-repo/semantics/article 2003 ftunivsalento https://doi.org/10.1007/S00300-003-0482-3 2024-03-28T01:39:35Z The large scale-worm Laetmonice producta Grube 1877 is the most abundant aphroditid polychaete in Antarctic coastal waters. We investigated the demographic structure and some reproductive features of different L. producta populations from high-Antarctic (Weddell Sea) and Antarctic Peninsula (King George Island) shelf bottoms, collected in summer 1996 (ANT-XIII/3, EASIZ I cruise) and autumn 2000 (ANT-XVII/3, EASIZ III cruise). L. producta in the studied geographic areas showed a wide bathymetric range (200-850 m depth), and a different size distribution pattern with depth, characterised by a reduction of large specimens in the deepest stations. The species is gonochoric, with females more abundant in specimens of larger sizes. Eggs at different stages of maturation (ranging from 40 to 320 μm in diameter) were examined in 270 individuals from different stations and size classes. Egg size showed a slightly bimodal trend, with largely overlapping egg cohorts, suggesting a continuous reproduction, and a long-lasting gametogenesis. Significant differences (Kolmogorov-Smirnov test, P<0.05) in egg-size frequency distribution were detected only when data of the two geographic areas were compared (Weddell Sea vs King George Island), and not according to stations within each area, and females' size. The two sets of geographic samples were collected in different seasons and therefore it was not possible to assess if differences observed are due to sampling time or to geographic factors. Mature spermatozoa were recognisable only in autumn male specimens from King George Island, and showed a rounded nucleus and a short conical acrosome. Occurrence of an endosymbiont polychaete, Veneriserva pygoclava meridionalis (new sub-species of Dorvilleidae), was recorded in the coelomic cavity of 163 specimens of L. producta, 125 of which were from the deepest station of the Weddell Sea (stn. 14, 850 m depth). L. producta females with and without the endosymbiont did not show differences in egg-size distribution. The reproductive ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula King George Island Weddell Sea Università del Salento: CINECA IRIS Polar Biology 26 5 327 333 |
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Open Polar |
collection |
Università del Salento: CINECA IRIS |
op_collection_id |
ftunivsalento |
language |
English |
topic |
Polychaete REPRODUCTION LAETMONICE SCALE WORMS |
spellingShingle |
Polychaete REPRODUCTION LAETMONICE SCALE WORMS MICALETTO G. GAMBI MC PIRAINO, Stefano Population structure and reproductive biology of Laetmonice producta Grube (Polychaeta, Aphroditidae) in Antarctic waters, and relationships with an endosymbiont polychaete. |
topic_facet |
Polychaete REPRODUCTION LAETMONICE SCALE WORMS |
description |
The large scale-worm Laetmonice producta Grube 1877 is the most abundant aphroditid polychaete in Antarctic coastal waters. We investigated the demographic structure and some reproductive features of different L. producta populations from high-Antarctic (Weddell Sea) and Antarctic Peninsula (King George Island) shelf bottoms, collected in summer 1996 (ANT-XIII/3, EASIZ I cruise) and autumn 2000 (ANT-XVII/3, EASIZ III cruise). L. producta in the studied geographic areas showed a wide bathymetric range (200-850 m depth), and a different size distribution pattern with depth, characterised by a reduction of large specimens in the deepest stations. The species is gonochoric, with females more abundant in specimens of larger sizes. Eggs at different stages of maturation (ranging from 40 to 320 μm in diameter) were examined in 270 individuals from different stations and size classes. Egg size showed a slightly bimodal trend, with largely overlapping egg cohorts, suggesting a continuous reproduction, and a long-lasting gametogenesis. Significant differences (Kolmogorov-Smirnov test, P<0.05) in egg-size frequency distribution were detected only when data of the two geographic areas were compared (Weddell Sea vs King George Island), and not according to stations within each area, and females' size. The two sets of geographic samples were collected in different seasons and therefore it was not possible to assess if differences observed are due to sampling time or to geographic factors. Mature spermatozoa were recognisable only in autumn male specimens from King George Island, and showed a rounded nucleus and a short conical acrosome. Occurrence of an endosymbiont polychaete, Veneriserva pygoclava meridionalis (new sub-species of Dorvilleidae), was recorded in the coelomic cavity of 163 specimens of L. producta, 125 of which were from the deepest station of the Weddell Sea (stn. 14, 850 m depth). L. producta females with and without the endosymbiont did not show differences in egg-size distribution. The reproductive ... |
author2 |
MICALETTO G., GAMBI MC Piraino, Stefano |
format |
Article in Journal/Newspaper |
author |
MICALETTO G. GAMBI MC PIRAINO, Stefano |
author_facet |
MICALETTO G. GAMBI MC PIRAINO, Stefano |
author_sort |
MICALETTO G. GAMBI MC |
title |
Population structure and reproductive biology of Laetmonice producta Grube (Polychaeta, Aphroditidae) in Antarctic waters, and relationships with an endosymbiont polychaete. |
title_short |
Population structure and reproductive biology of Laetmonice producta Grube (Polychaeta, Aphroditidae) in Antarctic waters, and relationships with an endosymbiont polychaete. |
title_full |
Population structure and reproductive biology of Laetmonice producta Grube (Polychaeta, Aphroditidae) in Antarctic waters, and relationships with an endosymbiont polychaete. |
title_fullStr |
Population structure and reproductive biology of Laetmonice producta Grube (Polychaeta, Aphroditidae) in Antarctic waters, and relationships with an endosymbiont polychaete. |
title_full_unstemmed |
Population structure and reproductive biology of Laetmonice producta Grube (Polychaeta, Aphroditidae) in Antarctic waters, and relationships with an endosymbiont polychaete. |
title_sort |
population structure and reproductive biology of laetmonice producta grube (polychaeta, aphroditidae) in antarctic waters, and relationships with an endosymbiont polychaete. |
publishDate |
2003 |
url |
http://hdl.handle.net/11587/104789 https://doi.org/10.1007/S00300-003-0482-3 |
genre |
Antarc* Antarctic Antarctic Peninsula King George Island Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula King George Island Weddell Sea |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000183122000006 volume:26 firstpage:327 lastpage:333 numberofpages:7 journal:POLAR BIOLOGY http://hdl.handle.net/11587/104789 doi:10.1007/S00300-003-0482-3 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0038275757 |
op_doi |
https://doi.org/10.1007/S00300-003-0482-3 |
container_title |
Polar Biology |
container_volume |
26 |
container_issue |
5 |
container_start_page |
327 |
op_container_end_page |
333 |
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1796935976354840576 |