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Biodiversity and distribution of the genus Gromia (Protista, Rhizaria) in the deep Weddell Sea (Southern Ocean)

Biodiversity and distribution of the genus Gromia (Protista, Rhizaria) in the deep Weddell Sea (Southern Ocean)
Biodiversity and distribution of the genus Gromia (Protista, Rhizaria) in the deep Weddell Sea (Southern Ocean)
We present a survey of morphospecies of Gromia, a genus of testate protists, from bathyal and abyssal depths in the Weddell Sea and adjacent areas of the Southern Ocean. This material represents the most extensive and diverse available collection of deep-sea gromiids so far recorded. The twelve species, nine of which are undescribed, are recognized on the basis of morphological criteria, including the test size and shape, the appearance and structure of the oral capsule, and the characteristics of the test wall. Most species have a single oral capsule, which is circular in plan view with a conical nipple-like shape in lateral view. One morphospecies has three oral capsules. The appearance and structure of the wall displays great variability among Gromia species, ranging from very delicate and transparent with highly reflective highlights to relatively thick with distinct patterns of ridges covering the surface. More often, however, differences in wall structure are more subtle. Most morphospecies were distributed at bathyal depths along the continental margin, but one was sampled at »4,800 m, representing the first record of an abyssal gromiid. Concurrent with findings from other regions of the World’s oceans, the Weddell Sea gromiids were mostly found in surficial sediments in areas of elevated organic input, suggesting that deep-sea gromiids are likely to play an important role in carbon cycling in bathyal eutrophic regions through the ingestion and degradation of fresh organic matter.
0722-4060
69-81
Rothe, N.
c89f2da3-d68b-4a3a-9f96-d2212a8195b9
Gooday, A.J.
d9331d67-d518-4cfb-baed-9df3333b05b9
Cedhagen, T.
4191b595-25ab-4e65-8bbe-4bd8a3de60ea
Hughes, J.A.
285bf26c-3175-4373-8cfa-449f38b4db30
Rothe, N.
c89f2da3-d68b-4a3a-9f96-d2212a8195b9
Gooday, A.J.
d9331d67-d518-4cfb-baed-9df3333b05b9
Cedhagen, T.
4191b595-25ab-4e65-8bbe-4bd8a3de60ea
Hughes, J.A.
285bf26c-3175-4373-8cfa-449f38b4db30

Rothe, N., Gooday, A.J., Cedhagen, T. and Hughes, J.A. (2011) Biodiversity and distribution of the genus Gromia (Protista, Rhizaria) in the deep Weddell Sea (Southern Ocean). Polar Biology, 34, 69-81. (doi:10.1007/s00300-010-0859-z).

Record type: Article

Abstract

We present a survey of morphospecies of Gromia, a genus of testate protists, from bathyal and abyssal depths in the Weddell Sea and adjacent areas of the Southern Ocean. This material represents the most extensive and diverse available collection of deep-sea gromiids so far recorded. The twelve species, nine of which are undescribed, are recognized on the basis of morphological criteria, including the test size and shape, the appearance and structure of the oral capsule, and the characteristics of the test wall. Most species have a single oral capsule, which is circular in plan view with a conical nipple-like shape in lateral view. One morphospecies has three oral capsules. The appearance and structure of the wall displays great variability among Gromia species, ranging from very delicate and transparent with highly reflective highlights to relatively thick with distinct patterns of ridges covering the surface. More often, however, differences in wall structure are more subtle. Most morphospecies were distributed at bathyal depths along the continental margin, but one was sampled at »4,800 m, representing the first record of an abyssal gromiid. Concurrent with findings from other regions of the World’s oceans, the Weddell Sea gromiids were mostly found in surficial sediments in areas of elevated organic input, suggesting that deep-sea gromiids are likely to play an important role in carbon cycling in bathyal eutrophic regions through the ingestion and degradation of fresh organic matter.

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Published date: 2011
Organisations: Marine Biogeochemistry

Identifiers

Local EPrints ID: 162755
URI: http://eprints.soton.ac.uk/id/eprint/162755
ISSN: 0722-4060
PURE UUID: 97db8aae-011b-4933-8fc8-64c51dc4d812

Catalogue record

Date deposited: 26 Aug 2010 15:02
Last modified: 08 Nov 2021 18:45

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Contributors

Author: N. Rothe
Author: A.J. Gooday
Author: T. Cedhagen
Author: J.A. Hughes

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