Abstract
Laternula elliptica is a key bivalve species and widely distributed around the Antarctic continent. This bivalve has been the study subject in several studies centered on ecological, physiological, biochemical, and behavioral patterns. However, little is known about the chemistry and the biomechanical properties of the shells of this mollusk. Here, we present the first report of the intra-population variability in the organic composition and mechanical properties of L. elliptica shells. Further, we analyze different morphological traits and their association with the metabolism of a population of L. elliptica from King George Island, Western Antarctic Peninsula. The summer metabolic rates and the hepatosomatic index values indicate good health conditions of this clam’s population. Shell periostracum chemistry is quite similar to bivalves from temperate regions, but the relative amount of protein increased ca. five-fold in shells of L. elliptica. The microhardness is approximately 32% lower than in bivalves from temperate regions. Our characterization of the L. elliptica shells suggests that periostracum chemistry could be specially fitted to avoid shell carbon exposure to dissolution (e.g., in corrosive acidified seawater). In contrast, the reduction in shell hardness may result from prioritizing behavioral (burial) and shell repairing strategies to confront biological (predators) and physical disturbances (e.g., ice scouring). Similar studies in other Antarctic mollusks will help understand the role of shell structure and function in confronting projected climate changes in the Antarctic ocean.
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Acknowledgements
We thank the members of the Chilean Antarctic Institute (INACH) station at Professor Escudero for support during the practical aspects of the work. We are also thankful to the editor, Elizabeth Harper, Roger Mann, and an anonymous review for very constructive comments on the manuscript. This work was supported by project INACH RT_ 08-16 to MAL, NAL and MJP. MAL, NAL, RGH, JFV and ARN also acknowledge the support of PIA ANID ACT-172037 for international collaborative studies. RGH acknowledges the support of ANID Grant No. PAI77190031. Further support by the ANID – Millennium Science Initiative Program – Code ICN2019_015 to MAL and NAL is greatly appreciated.
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MAL, RGH, NAL, MJP, and LR conceived and designed research. RGH, MAL, IB, CU, and CG conducted experiment and analyses. JFV, ARN contributed with analytical tools. RGH, NAL, MAL, and MJP analyzed data. RGH, MAL, NAL, and MJP wrote the manuscript. All authors read and approved the manuscript.
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Supplementary file1 (PNG 45 KB) Relation between body mass (wet tissue weight) and metabolic rate in Laternula elliptica from Fildes Bay, King George Island, Antarctic region.
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García-Huidobro, M.R., Poupin, M.J., Urrutia, C. et al. An intrapopulational study of organic compounds and biomechanical properties of the shell of the Antarctic bivalve Laternula elliptica (P. P. King, 1832) at King George Island. Polar Biol 44, 1343–1352 (2021). https://doi.org/10.1007/s00300-021-02882-9
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DOI: https://doi.org/10.1007/s00300-021-02882-9