Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

The giants of the phylum Brachiopoda : a matter of diet?

Angiolini, Lucia and Crippa, Gaia and Azmy, Karem and Capitani, Giancarlo and Confalonieri, Giorgia and Della Porta, Giovanna and Griesshaber, Erika and Harper, David A. T. and Leng, Melanie J. and Nolan, Leah and Orlandi, Marco and Posenato, Renato and Schmahl, Wolfgang W. and Banks, Vanessa J. and Stephenson, Michael H. (2019) 'The giants of the phylum Brachiopoda : a matter of diet?', Palaeontology., 62 (6). pp. 889-917.

Abstract

The species of the brachiopod Gigantoproductus are giants within the Palaeozoic sedentary benthos. This presents a dilemma as living brachiopods have low‐energy lifestyles. Although brachiopod metabolic rates were probably higher during the Palaeozoic than today, the massive size reached by species of Gigantoproductus is nevertheless unusual. By examining the diet of Gigantoproductus species from the Visean (Mississippian, Carboniferous) of Derbyshire (UK), we seek to understand the mechanisms that enabled those low‐metabolism brachiopod species to become giants. Were they suspension feeders, similar to all other brachiopods, or did endosymbiosis provide a lifestyle that allowed them to have higher metabolic rates and become giants? We suggest that the answer to this conundrum may be solved by the identification of the biogeochemical signatures of symbionts, through combined analyses of the carbon and nitrogen‐isotopic compositions of the occluded organic matrix within their calcite shells. The shells are formed of substructured columnar units that are remarkably long and a few hundreds of microns wide, deemed to be mostly pristine based on multiple analyses (petrography, cathodoluminescence (CL), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM)); they contain occluded organic fractions detected by TEM, nuclear magnetic resonance (NMR) and gas chromatography mass spectrometry (GC‐MS) analyses. We conclude that the gigantic size reached by the species of Gigantoproductus is probably the result of a mixotroph lifestyle, by which they could rely on the energy and nutrients derived both from photosymbiotic microbes and from filtered particulate food.

Item Type:Article
Full text:(AM) Accepted Manuscript
Download PDF
(7653Kb)
Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1111/pala.12433
Publisher statement:This is the peer reviewed version of the following article: Angiolini, Lucia, Crippa, Gaia, Azmy, Karem, Capitani, Giancarlo, Confalonieri, Giorgia, Della Porta, Giovanna, Griesshaber, Erika, Harper, David A. T., Leng, Melanie J., Nolan, Leah, Orlandi, Marco, Posenato, Renato, Schmahl, Wolfgang W., Banks, Vanessa J. & Stephenson, Michael H. (2019). The giants of the phylum Brachiopoda: a matter of diet? Palaeontology 62(6): 889-917 which has been published in final form at https://doi.org/10.5061/dryad.m42t6tm. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Date accepted:19 February 2019
Date deposited:25 June 2019
Date of first online publication:10 June 2019
Date first made open access:10 June 2020

Save or Share this output

Export:
Export
Look up in GoogleScholar