Hi Chris -

We have d34S values over +22 in jellyfish mesoglea from a broad spatial band across the North Sea i.e. not a few random values. Samples all run by Rona in East Kilbride. Katie St John Glew’s paper with CNS isoscapes for UK shelf seas is just in press with Methods Ecol Evol, so should be available pretty soon. We don’t have fish from the same sites in the North Sea with the very high d34S values,  but cod muscle so far analysed from sites around the N Atlantic gets up to +20, and looks to be between 2-4 per mille lower than jellyfish mesoglea from similar locations.


Clive Trueman
Marine Isotope Ecology
University of Southampton

From: Stable Isotope Geochemistry <[log in to unmask]> on behalf of Christian Dietz <[log in to unmask]>
Reply-To: Stable Isotope Geochemistry <[log in to unmask]>
Date: Tuesday, 11 December 2018 02:01
To: "[log in to unmask]" <[log in to unmask]>
Subject: Re: [ISOGEOCHEM] Marine d34S question

Hi Chris, 
we found values up to +21 for d34S (quite upper limit) in a variety of antarctic sealife, such as Sea Ice Algae, Pycnogonida, Nudibranchia, Holothuria, Gastropods, Asteroidae.
Not in fish (<18 permil), bivalves or phytoplancton though.
Run on pyrocube with Isoprime100 in CNS mode.

On Sat, 8 Dec 2018 at 01:09, Chris Harrod <[log in to unmask]> wrote:
Hi folks

We've been running CNS on our new Pyro Cube/visION machine and have been really impressed with the results.
The last batch of marine fish livers however include values >21 ‰, which (possibly reflecting my ignorance of all things d34S) I thought was the upper limit for marine-derived S.

Although I think it is likely teething problems with us and the machine, I wondered if anyone in IsoGeochem land has seen d34S values in fish etc higher than 21 ‰? We are in a rather odd location (Humboldt Current), with lots of upwelling/productivity so strange things do happen here biologically that often have big isotopic impacts and turn established norms on their head.


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Professor Chris Harrod
(Fish & Aquatic Ecology)

Email: [log in to unmask]
Twitter: @chris_harrod
HarrodLab: Fish and Stable Isotope Ecology Laboratory
Instituto de Ciencias Naturales Alexander von Humboldt,
Universidad de Antofagasta,
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