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• W2019456074 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 15–22 m depth were examined by histological analysis. M. daytoni is gonochoristic and exhibited a sex ratio of 1:1. Oocyte sizes (>300 µm) 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 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.Keywords: Antarctica; benthic communities; Pennatulacea; reproduction; oogenesis(Published: 6 August 2013)Citation: Polar Research 2013, 32, 20040, http://dx.doi.org/10.3402/polar.v32i0.20040" @default.
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• W2019456074 date "2013-01-01" @default.
• W2019456074 modified "2023-10-17" @default.
• W2019456074 title "Reproductive biology of the Antarctic “sea pen” <i>Malacobelemnon daytoni</i> (Octocorallia, Pennatulacea, Kophobelemnidae)" @default.
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• W2019456074 doi "https://doi.org/10.3402/polar.v32i0.20040" @default.
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