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dc.contributor.author
Sahade, Ricardo Jose
dc.contributor.author
Servetto, Natalia
dc.contributor.author
Torre, Luciana
dc.date.available
2016-11-03T20:45:55Z
dc.date.issued
2013-07
dc.identifier.citation
Sahade, Ricardo Jose; Servetto, Natalia; Torre, Luciana; Reproductive biology of the Antarctic "sea pen" Malacobelemnon daytoni (Octocoralia, Pennatulacea, Kophbelemnidae); Norwegian Polar Institute; Polar Research; 32; 7-2013; 1-11
dc.identifier.issn
1751-8369
dc.identifier.uri
http://hdl.handle.net/11336/7954
dc.description.abstract
The reproductive biology of the sea pen Malacobelemnon daytoni was studied at Potter Cove, South Shetland Islands, where it is one of the dominant species in shallow waters. Specimens collected at 1522 m depth were examined by histological analysis. M. daytoni is gonochoristic and exhibited a sex ratio of 1:1. Oocyte sizes (300 mm) and the absence of embryos or newly developed larvae in the colonies suggest that this species can have lecithotrophic larvae and experience external fertilization. This life strategy is in line with other members of the group and supports the hypothesis that this could be a phylogenetically fixed trait for pennatulids. It was observed that oocytes were<br />generated by gastrodermic tissue and released to the longitudinal canal. Thereafter, they migrate along the canal until they reach maturity and are released by autozooids at the top of the colonies. This striking feature has not yet been reported for other pennatulaceans. Mature oocytes were observed from colonies of 15 mm in length, suggesting that sexual maturity can be reached rapidly. This is contrary to what is hypothesized for the vast majority of Antarctic benthic invertebrates, namely that rates of activities associated with development, reproduction and growth are almost universally very slow. This strategy may also explain the ecological success of M. daytoni in areas with high ice impact as in the shallow waters of Potter Cove.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Norwegian Polar Institute
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc/2.5/ar/
dc.subject
Antarctica
dc.subject
Benthic Community
dc.subject
Pennatulacea
dc.subject
Reproduction
dc.subject
Oogenesis
dc.subject.classification
Biología Marina, Limnología
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Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Reproductive biology of the Antarctic "sea pen" Malacobelemnon daytoni (Octocoralia, Pennatulacea, Kophbelemnidae)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-11-02T18:11:26Z
dc.journal.volume
32
dc.journal.pagination
1-11
dc.journal.pais
Noruega
dc.description.fil
Fil: Sahade, Ricardo Jose. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
dc.description.fil
Fil: Servetto, Natalia. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
dc.description.fil
Fil: Torre, Luciana. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Cordoba. Instituto de Diversidad y Ecologia Animal; Argentina
dc.journal.title
Polar Research
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://dx.doi.org/10.3402/polar.v32i0.20040
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.polarresearch.net/index.php/polar/article/view/20040


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