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Physiological and morphological assessments suggest opposite structural allocation strategies between closely related invasive clams

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Abstract

Respiration is a central physiological function related to the rates of energy acquisition, transformation, and use by organisms, while allometric relationships provide insight into patterns of allocation of that energy. To assess life strategy differences between closely related invasive species, we measured oxygen consumption rates, tissue mass, shell mass, and gill area of Corbicula fluminea and Corbicula largillierti clams. We compared patterns of metabolic scaling between the two species using model II regressions. Although oxygen consumption rates were strongly associated with gill area in both species, C. fluminea had consistently higher metabolic rates, shell thickness, and shell mass, but a lower tissue-to-shell mass ratio, than C. largillierti. These differences were more marked among small individuals. Our results suggest opposite structural allocation strategies between the two species. Corbicula fluminea invests more energy in the development of thicker shells in early life stages, which can be subsidized by higher metabolic rates than C. largillierti. By contrast, C. largillierti allocates more energy to tissue mass production. These differences may play a role in explaining contrasting competitive and colonization abilities and geographical distribution patterns between both species in invaded areas.

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Data availability

Row data generated in this survey are available from the Zenodo Digital Repository. https://doi.org/10.5281/zenodo.3542117 (Hünicken et al., 2019).

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Acknowledgements

We thank Erik Thuesen from The Evergreen State College for technical advice, and the Lacustrine Police of Cabra Corral Reservoir, Salta for granting access to the samples. We also thank two anonymous reviewers and Nicolás Bonel from CERZOS-CONICET for critical comments on an earlier draft of this article, and Ken Toyama from the University of Toronto for his help with JN analyses.

Funding

This research was funded by research grants from the Argentine Agencia Nacional de Promoción Científica y Tecnológica PICT 2015-3513 to E.M.P. and PICT 2016-0631 to F.S., and a PhD fellowship from CONICET to L.A.H.

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  1. Leandro A. Hünicken

    Present address: Centro de Investigación Aplicada y Transferencia Tecnológica en Recursos Marinos ‘‘Almirante Storni’’, Güemes 1030, R8520CXV, San Antonio Oeste, Río Negro, Argentina

Authors and Affiliations

  1. Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’, Av. Ángel Gallardo 470, C1405DJR, Buenos Aires, Argentina

    Leandro A. Hünicken & Esteban M. Paolucci

  2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina

    Leandro A. Hünicken & Esteban M. Paolucci

  3. Instituto para el estudio de la Biodiversidad de Invertebrados, Facultad de Ciencias Naturales, Universidad Nacional de Salta, Av. Bolivia 5150, A4408FVY, Salta, Argentina

    Leandro A. Hünicken & Francisco Sylvester

  4. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Salta, Argentina

    Francisco Sylvester

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All authors conceived the idea and designed the methodology used. LAH and FS collected the experimental organisms. LAH conducted laboratory procedures, led data analysis, and writing with supervision by FS and EMP. All authors contributed to the final version of the manuscript. FS and EMP provided funding acquisition, project administration, and resources.

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Hünicken, L.A., Sylvester, F. & Paolucci, E.M. Physiological and morphological assessments suggest opposite structural allocation strategies between closely related invasive clams. Hydrobiologia 849, 2859–2875 (2022). https://doi.org/10.1007/s10750-022-04906-9

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