ArticlePloS one2026
Intrinsic over extrinsic: Species identity shapes spatial and interannual Mg/Ca patterns in Arctic marine calcifiers.
Article in PloS one, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Marine calcifiers incorporate magnesium into their calcium carbonate skeletons through processes influenced by both ambient environmental conditions and species-specific physiological regulation. As a result, their carbonate structures can serve as valuable archives of past and present oceanic conditions, provided that biological controls are explicitly considered. This study investigated how skeletal magnesium-to-calcium (Mg/Ca) ratios vary in space and time among three Arctic benthic invertebrates differing in phylogeny, evolutionary history, and biomineralization strategy: the barnacle Semibalanus balanoides, the spirorbid Paradexiospira violacea, and the bryozoan Harmeria scutulata. Mg/Ca ratios were quantified using inductively coupled plasma atomic emission spectroscopy (ICP-AES) across three Svalbard fjords and over a four-year temporal interval (2006-2009). Kruskal-Wallis analyses revealed that species identity was the dominant factor controlling Mg/Ca ratios among the studied taxa. S. balanoides exhibited the lowest values of mean Mg/Ca ratios but highly variable (mean = 35.2 mmol/mol ± 16.8 SD), whereas P. violacea (62.5 mmol/mol ± 14.3) and H. scutulata (65.3 mmol/mol ± 14.1) showed higher and more consistent Mg/Ca ratio. Significant differences in Mg/Ca ratios were observed among sites for all species, following a consistent Hornsund < Kongsfjorden < Isfjorden pattern. However, the magnitude of site-level variability in Mg/Ca differed among species, confirming that species-specific physiological controls exert a stronger influence on skeletal Mg incorporation than external, site-specific environmental conditions. In Isfjorden, interannual trends in Mg/Ca between 2006 and 2009 were found to be species-specific but non-significant for all species. Weak, negative, and statistically significant relationships with bottom-water temperatures in Isfjorden was found only in P. violacea. Overall, these results highlight the predominant role of intrinsic biological controls over ambient environmental conditions in shaping skeletal Mg/Ca ratios and underscore the importance of species-resolved approaches when applying geochemical proxies in rapidly changing Arctic ecosystems.
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