The University of Southampton
University of Southampton Institutional Repository

Satellite to Seafloor - The Global Biogeography of the Elasipodid Holothurians

Satellite to Seafloor - The Global Biogeography of the Elasipodid Holothurians
Satellite to Seafloor - The Global Biogeography of the Elasipodid Holothurians
Knowledge of the environmental factors driving species distributions in the deep-sea is essential for a better understanding of the biogeography of the abyssal benthos. Differences in the niches of elasipodid holothurians appear to exist at the level of species, genera and family. This study analysed the global distributions of elasipodid holothurians from records collected from online Natural History Collection databases, cruise reports and published literature.

A comparison of the distribution of four families of elasipodid holothurians, in relation to seven abiotic environmental factors found the families Psychropotidae and Elpidiidae to have the most different environmental distributions. POC flux, intra-annual seasonality and inter-annual variability in POC flux were the best explanatory factors for differences between the families. The Elpidiidae were generally found in areas with greater temporal variability. The potential for biogeographic schemes based upon the ecology of the upper ocean to inform management decisions for the deep sea was also investigated. Results suggest that Longhurst’s ‘case models’ are more closely linked to the distribution of species and genera than Longhurst’s biomes. Results also confirmed that provinces from the same ocean and latitude were more similar in terms of species composition, but that historical factors were equally capable of explaining the observed patterns and must be taken into account.

Population genetic studies of two species of Elasipodida; Psychropotes longicauda and Oneirophanta mutabilis were conducted using CO1 and 16S molecular markers. Multiple sympatric lineages were found in the Indian, Pacific and Atlantic Oceans in both species. Differences between sympatric lineages were greater than geographic differences within lineages. The potential for speciation in the Antarctic or Southern Ocean before multiple northwards dispersal events is considered the most plausible explanation for the observed patterns. Oceanic gyres therefore do not appear to be barriers to dispersal in these species.

The distributions of the elasipodid holothurians are therefore thought to be controlled by a combination of life-history, dispersal ability, temporal and quantitative variations in food supply and competitive interactions as well as historical processes relating to centres of origin for particular genera.
Ross, Elizabeth Jane
03461000-248a-4b8b-a235-02b0b0712f21
Ross, Elizabeth Jane
03461000-248a-4b8b-a235-02b0b0712f21
Billett, David S.M.
aab439e2-c839-4cd2-815c-3d401e0468db

(2012) Satellite to Seafloor - The Global Biogeography of the Elasipodid Holothurians. University of Southampton, Ocean and Earth Science, Doctoral Thesis, 346pp.

Record type: Thesis (Doctoral)

Abstract

Knowledge of the environmental factors driving species distributions in the deep-sea is essential for a better understanding of the biogeography of the abyssal benthos. Differences in the niches of elasipodid holothurians appear to exist at the level of species, genera and family. This study analysed the global distributions of elasipodid holothurians from records collected from online Natural History Collection databases, cruise reports and published literature.

A comparison of the distribution of four families of elasipodid holothurians, in relation to seven abiotic environmental factors found the families Psychropotidae and Elpidiidae to have the most different environmental distributions. POC flux, intra-annual seasonality and inter-annual variability in POC flux were the best explanatory factors for differences between the families. The Elpidiidae were generally found in areas with greater temporal variability. The potential for biogeographic schemes based upon the ecology of the upper ocean to inform management decisions for the deep sea was also investigated. Results suggest that Longhurst’s ‘case models’ are more closely linked to the distribution of species and genera than Longhurst’s biomes. Results also confirmed that provinces from the same ocean and latitude were more similar in terms of species composition, but that historical factors were equally capable of explaining the observed patterns and must be taken into account.

Population genetic studies of two species of Elasipodida; Psychropotes longicauda and Oneirophanta mutabilis were conducted using CO1 and 16S molecular markers. Multiple sympatric lineages were found in the Indian, Pacific and Atlantic Oceans in both species. Differences between sympatric lineages were greater than geographic differences within lineages. The potential for speciation in the Antarctic or Southern Ocean before multiple northwards dispersal events is considered the most plausible explanation for the observed patterns. Oceanic gyres therefore do not appear to be barriers to dispersal in these species.

The distributions of the elasipodid holothurians are therefore thought to be controlled by a combination of life-history, dispersal ability, temporal and quantitative variations in food supply and competitive interactions as well as historical processes relating to centres of origin for particular genera.

PDF
Ross, Elizabeth_PhD_Thesis.pdf - Other
Download (11MB)

More information

Published date: 1 September 2012
Organisations: University of Southampton, Ocean and Earth Science

Identifiers

Local EPrints ID: 359067
URI: http://eprints.soton.ac.uk/id/eprint/359067
PURE UUID: 4c24f677-a318-44b7-96c9-5fb235f28786

Catalogue record

Date deposited: 23 Oct 2013 13:36
Last modified: 18 Jul 2017 03:23

Export record

Contributors

Author: Elizabeth Jane Ross
Thesis advisor: David S.M. Billett

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×