Giant sponge grounds of Central Arctic seamounts are associated with extinct seep life


Contact
Autun.Purser [ at ] awi.de

Abstract

The Central Arctic Ocean is one of the most oligotrophic oceans on Earth because of its sea- ice cover and short productive season. Nonetheless, across the peaks of extinct volcanic seamounts of the Langseth Ridge (87°N, 61°E), we observe a surprisingly dense benthic biomass. Bacteriosponges are the most abundant fauna within this community, with a mass of 460 g C m−2 and an estimated carbon demand of around 110 g C m−2 yr−1, despite export fluxes from regional primary productivity only sufficient to provide <1% of this required carbon. Observed sponge distribution, bulk and compound-specific isotope data of fatty acids suggest that the sponge microbiome taps into refractory dissolved and particulate organic matter, including remnants of an extinct seep community. The metabolic profile of bacter- iosponge fatty acids and expressed genes indicate that autotrophic symbionts contribute significantly to carbon assimilation. We suggest that this hotspot ecosystem is unique to the Central Arctic and associated with extinct seep biota, once fueled by degassing of the volcanic mounts.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Helmholtz Cross Cutting Activity (2021-2027)
N/A
Research Networks
Peer revision
Peer-reviewed, Web of Science / Scopus
Publication Status
Published
Eprint ID
55672
DOI 10.1038/s41467-022-28129-7

Cite as
Morganti, T. M. , Slaby, B. M. , de Kluijver, A. , Busch, K. , Hentschel, U. , Middelburg, J. J. , Mollenhauer, G. , Dannheim, J. , Rapp, H. T. , Purser, A. and Boetius, A. (2022): Giant sponge grounds of Central Arctic seamounts are associated with extinct seep life , Nature Communications, 13 (638) . doi: 10.1038/s41467-022-28129-7


Download
[thumbnail of s41467-022-28129-7.pdf]
Preview
PDF
s41467-022-28129-7.pdf

Download (12MB) | Preview

Share


Citation

Geographical region

Research Platforms

Campaigns
PS > 101

Funded by
info:eu-repo/grantAgreement/EC/FP7/679849


Actions
Edit Item Edit Item