Spatial resolution of shell microchemistry for tracking dispersing pelagic mussels in a large open embayment in northern New Zealand

Wenjie Wu; Carolyn J. Lundquist; Andrew G. Jeffs

doi:10.1071/MF24065

RESEARCH ARTICLE (Open Access)

Previous Next Contents Vol 76(1)

Spatial resolution of shell microchemistry for tracking dispersing pelagic mussels in a large open embayment in northern New Zealand

Wenjie Wu

^A ^* , Carolyn J. Lundquist ^B ^C and Andrew G. Jeffs ^A ^D

+ Author Affiliations

- Author Affiliations

^A Institute of Marine Science, The University of Auckland, Auckland, New Zealand.

^B School of Environment, The University of Auckland, Auckland, New Zealand.

^C National Institute of Water and Atmospheric Research (NIWA), Hamilton, New Zealand.

^D School of Biological Sciences, The University of Auckland, Auckland, New Zealand.

^* Correspondence to: wenjie.wu@auckland.ac.nz

Handling Editor: Richard Marchant

Marine and Freshwater Research 76, MF24065 https://doi.org/10.1071/MF24065

Submitted: 25 March 2024 Accepted: 17 December 2024 Published: 16 January 2025

© 2025 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Context

The effectiveness of using shell microchemistry methods for reconstructing the pelagic dispersal of shell-forming marine organisms relies on the existence of sufficient spatial variability and temporal stability in the microchemical composition of coastal waters.

Aims

This study aimed to determine whether shell microchemistry methods can reliably infer pelagic dispersal of green-lipped mussel (Perna canaliculus) across a large and well-mixed embayment in New Zealand.

Methods

Isotopes of 12 chemical elements (⁷Li, ²⁷Al, ⁵⁹Co, ⁶⁰Ni, ⁶³Cu, ⁶⁶Zn, ⁸⁸Sr, ¹³⁸Ba, ¹³⁹La, ¹⁴⁰Ce, ²⁰⁸Pb and ²³⁸U) were assessed from juvenile mussel shells grown in situ from 22 sites for two consecutive periods of ~5 weeks.

Key results

There was sufficient spatial variability in measured shell element concentrations to support microchemical atlases that are capable of distinguishing among regions within this large embayment, with 73% assignment accuracy. However, the temporal variability in the microchemical signatures is such that they would need to be sampled contemporaneously with animal samples to be effective for distinguishing pelagic dispersal of mussels in the embayment.

Conclusions

The shell microchemistry shows sufficient spatio-temporal resolution for reliably inferring pelagic dispersal of this economically and ecologically important mussel species over a large embayment. Sufficient resolution at such large scale may come from unique hydro-geological inputs.

Implications

This study confirms the feasibility of shell microchemistry method in tracking pelagic dispersal of marine organisms across a large well-mixed embayment, offering insights to improve accuracy and reduce costs for future research.

Keywords: coastal-water chemistry, estuaries, freshwater inflows, green-lipped mussel, LA-ICP-MS, larval mussel dispersal, Perna canaliculus, shell microchemistry.

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