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Species replacement dominates megabenthos beta diversity in a remote seamount setting

Species replacement dominates megabenthos beta diversity in a remote seamount setting
Species replacement dominates megabenthos beta diversity in a remote seamount setting
Seamounts are proposed to be hotspots of deep-sea biodiversity, a pattern potentially arising from increased productivity in a heterogeneous landscape leading to either high species co-existence or species turnover (beta diversity). However, studies on individual seamounts remain rare, hindering our understanding of the underlying causes of local changes in beta diversity. Here, we investigated processes behind beta diversity using ROV video, coupled with oceanographic and quantitative terrain parameters, over a depth gradient in Annan Seamount, Equatorial Atlantic. By applying recently developed beta diversity analyses, we identified ecologically unique sites and distinguished between two beta diversity processes: species replacement and changes in species richness. The total beta diversity was high with an index of 0.92 out of 1 and was dominated by species replacement (68%). Species replacement was affected by depth-related variables, including temperature and water mass in addition to the aspect and local elevation of the seabed. In contrast, changes in species richness component were affected only by the water mass. Water mass, along with substrate also affected differences in species abundance. This study identified, for the first time on seamount megabenthos, the different beta diversity components and drivers, which can contribute towards understanding and protecting regional deep-sea biodiversity.
2045-2322
Victorero, Lissette
b9c0ee3a-6324-4276-8f40-6156d6e81c02
Robert, Katleen
49e4bfa2-0999-41ec-b50d-65c0f8896583
Robinson, Laura F.
1c5472f3-1574-4a7a-8d1f-f9b13f6479fb
Taylor, Michelle L.
6550a70a-8217-442c-bcfb-284c1d60e7e2
Huvenne, Veerle A.I.
f22be3e2-708c-491b-b985-a438470fa053
Victorero, Lissette
b9c0ee3a-6324-4276-8f40-6156d6e81c02
Robert, Katleen
49e4bfa2-0999-41ec-b50d-65c0f8896583
Robinson, Laura F.
1c5472f3-1574-4a7a-8d1f-f9b13f6479fb
Taylor, Michelle L.
6550a70a-8217-442c-bcfb-284c1d60e7e2
Huvenne, Veerle A.I.
f22be3e2-708c-491b-b985-a438470fa053

Victorero, Lissette, Robert, Katleen, Robinson, Laura F., Taylor, Michelle L. and Huvenne, Veerle A.I. (2018) Species replacement dominates megabenthos beta diversity in a remote seamount setting. Scientific Reports, 8, [4152]. (doi:10.1038/s41598-018-22296-8).

Record type: Article

Abstract

Seamounts are proposed to be hotspots of deep-sea biodiversity, a pattern potentially arising from increased productivity in a heterogeneous landscape leading to either high species co-existence or species turnover (beta diversity). However, studies on individual seamounts remain rare, hindering our understanding of the underlying causes of local changes in beta diversity. Here, we investigated processes behind beta diversity using ROV video, coupled with oceanographic and quantitative terrain parameters, over a depth gradient in Annan Seamount, Equatorial Atlantic. By applying recently developed beta diversity analyses, we identified ecologically unique sites and distinguished between two beta diversity processes: species replacement and changes in species richness. The total beta diversity was high with an index of 0.92 out of 1 and was dominated by species replacement (68%). Species replacement was affected by depth-related variables, including temperature and water mass in addition to the aspect and local elevation of the seabed. In contrast, changes in species richness component were affected only by the water mass. Water mass, along with substrate also affected differences in species abundance. This study identified, for the first time on seamount megabenthos, the different beta diversity components and drivers, which can contribute towards understanding and protecting regional deep-sea biodiversity.

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s41598-018-22296-8 - Version of Record
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More information

Accepted/In Press date: 21 February 2018
e-pub ahead of print date: 7 March 2018

Identifiers

Local EPrints ID: 420325
URI: http://eprints.soton.ac.uk/id/eprint/420325
ISSN: 2045-2322
PURE UUID: d2b0932c-4bd5-4a21-837b-454fdec0cf9e
ORCID for Veerle A.I. Huvenne: ORCID iD orcid.org/0000-0001-7135-6360

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Date deposited: 04 May 2018 16:30
Last modified: 17 Dec 2019 01:48

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