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Reproductive morphology of the deep-sea protobranch bivalves Yoldiella ecaudata, Yoldiella sabrina, and Yoldiella valettei (Yoldiidae) from the Southern Ocean

Reproductive morphology of the deep-sea protobranch bivalves Yoldiella ecaudata, Yoldiella sabrina, and Yoldiella valettei (Yoldiidae) from the Southern Ocean
Reproductive morphology of the deep-sea protobranch bivalves Yoldiella ecaudata, Yoldiella sabrina, and Yoldiella valettei (Yoldiidae) from the Southern Ocean
The protobranch bivalves of the Southern Ocean are poorly understood ecologically, despite their high abundances in soft sediments from the shelf to the deep sea. The subclass has a long evolutionary history pre-dating the formation of the polar front, and knowledge of their reproductive biology is key to understanding better their successful radiation into the Southern Ocean, and within deep-sea basins. In this study we for the first time investigate the reproductive morphology of three deep-water protobranchs; Yoldiella ecaudata from 500 m in the Amundsen Sea; Y. sabrina from between 200 and 4730 m in the Amundsen Sea, Scotia Sea, and South Atlantic; and Y. valettei from 1000 m in the Scotia Sea. All three species demonstrate evidence of lecithotrophic larval development with maximum oocyte size of 130.4 µm, 187.9 µm, and 120.6 µm in Y. ecaudata, Y. sabrina, and Y. valettei, respectively, further supported by prodissoconch I measurements. There is evidence for simultaneous hermaphroditism in Y. valettei. Asynchronous oocyte development within specimens of Y. ecaudata and Y. valettei is described, and also between populations of Y. sabrina separated by depth. The reproductive characteristics, comparable to those of North Atlantic deep-sea protobranch species, are discussed in the context of the cold thermally-stable conditions prevailing on the deep-Antarctic continental shelf and deep sea. The requirement for reclassification of this complex subclass is also discussed in relation to observed soft anatomy and shell characteristics.
0722-4060
1383-1392
Reed, Adam
ec734ee2-469c-4259-91d6-4abcfbe65e3b
Morris, J.P.
7060ae12-d0fd-41a5-89df-83870b59be31
Linse, K.
00b1d953-ff94-4bb7-ab13-041497c5083c
Thatje, S.
f1011fe3-1048-40c0-97c1-e93b796e6533
Reed, Adam
ec734ee2-469c-4259-91d6-4abcfbe65e3b
Morris, J.P.
7060ae12-d0fd-41a5-89df-83870b59be31
Linse, K.
00b1d953-ff94-4bb7-ab13-041497c5083c
Thatje, S.
f1011fe3-1048-40c0-97c1-e93b796e6533

Reed, Adam, Morris, J.P., Linse, K. and Thatje, S. (2014) Reproductive morphology of the deep-sea protobranch bivalves Yoldiella ecaudata, Yoldiella sabrina, and Yoldiella valettei (Yoldiidae) from the Southern Ocean. Polar Biology, 37, 1383-1392. (doi:10.1007/s00300-014-1528-4).

Record type: Article

Abstract

The protobranch bivalves of the Southern Ocean are poorly understood ecologically, despite their high abundances in soft sediments from the shelf to the deep sea. The subclass has a long evolutionary history pre-dating the formation of the polar front, and knowledge of their reproductive biology is key to understanding better their successful radiation into the Southern Ocean, and within deep-sea basins. In this study we for the first time investigate the reproductive morphology of three deep-water protobranchs; Yoldiella ecaudata from 500 m in the Amundsen Sea; Y. sabrina from between 200 and 4730 m in the Amundsen Sea, Scotia Sea, and South Atlantic; and Y. valettei from 1000 m in the Scotia Sea. All three species demonstrate evidence of lecithotrophic larval development with maximum oocyte size of 130.4 µm, 187.9 µm, and 120.6 µm in Y. ecaudata, Y. sabrina, and Y. valettei, respectively, further supported by prodissoconch I measurements. There is evidence for simultaneous hermaphroditism in Y. valettei. Asynchronous oocyte development within specimens of Y. ecaudata and Y. valettei is described, and also between populations of Y. sabrina separated by depth. The reproductive characteristics, comparable to those of North Atlantic deep-sea protobranch species, are discussed in the context of the cold thermally-stable conditions prevailing on the deep-Antarctic continental shelf and deep sea. The requirement for reclassification of this complex subclass is also discussed in relation to observed soft anatomy and shell characteristics.

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Published date: 2014
Organisations: Ocean and Earth Science

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Local EPrints ID: 365475
URI: http://eprints.soton.ac.uk/id/eprint/365475
ISSN: 0722-4060
PURE UUID: a5ccafa6-f99c-476b-aad2-d37b91311252

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Date deposited: 05 Jun 2014 15:32
Last modified: 16 Jul 2019 21:04

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Author: Adam Reed
Author: J.P. Morris
Author: K. Linse
Author: S. Thatje

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