Age Determination of Rocky Mountain Ridged Mussels (Gonidea angulata) in the Okanagan Basin, Canada

Author:

Grant Paul1ORCID,Wade Joy1,Lewis Todd R.2ORCID,Castañeda Rowshyra A.1,Branquinho Emma1,MacConnachie Sean1,Wischniowski Stephen1,Campbell Barbara1

Affiliation:

1. Fisheries and Oceans Canada, Sidney, BC V8L 5T5, Canada

2. UWE Bristol—Frenchay Campus, Coldharbour Ln, Bristol BS16 1QY, UK

Abstract

Freshwater ecosystems and the biodiversity they support are facing unprecedented threats, exemplified by broad declines of freshwater mussels within a global biodiversity hotspot. The Rocky Mountain Ridged Mussel (Gonidea angulata) is an at-risk species in Canada, with limited information on population age structure. Maximum age of the species was found to be 50 years, by counting winter annuli and validated by isotopic oxygen analysis. Employing a Bayesian Generalized Linear Mixed Model (GLMM), results showed mussels from river habitat were predicted to have faster growth rates than mussels from lake habitats, highlighting the impact of local environmental conditions, including temperature variations, primary productivity, and water quality, on mussel growth dynamics. Of concern was the limited evidence of juvenile recruitment, with the majority of specimens potentially representing an ageing population. This pattern potentially signals an early warning of impending population decline. Our results underscore the necessity of monitoring age structure as a vital component of assessing population health of freshwater mussels and the importance of understanding local environmental conditions when determining age.

Funder

Fisheries and Oceans Canada

Publisher

MDPI AG

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