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Seasonal growth rates of gooseneck barnacles (Lepas spp.): Proxies for floating time of rafts in marine ecosystems

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Abstract

Gooseneck barnacles of the genus Lepas are sessile crustaceans settling and growing on free-floating substrata. They can be used as indicators for floating time of objects such as plastic, algae, airplane wrecks or human corpses. Precise estimates of floating time are only possible when accurate growth rates of Lepas are known. However, many factors modulate the growth of these crustaceans, making floating time estimates difficult. In this study, we measured growth rates of L. australis and L. anatifera in the Central Humboldt Current System over two consecutive summer and winter seasons. Growth patterns were best described by a logistic growth curve. Using the asymptotic value (maximum size) for each species and each season, we selected the linear phase of growth to fit simple predictive linear models to estimate floating time. Growth rates of L. anatifera were almost twice as high in the warmer summer months compared to the winter season suggesting that growth rates are strongly associated with temperature. Consequently, seasonal or regional growth rates are required to precisely estimate floating time of objects at sea.

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Acknowledgements

We acknowledge financial support from Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT) 1100749. Big thanks go to Germán Penna, David Jofré and Freddy Gonzalez for their assistance in the field and help with data collection as well as to Eva Rothäusler and David Jofre for their help with the map.

Funding

Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT) 1100749.

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Contributions

HG: study design, data collection, data analysis and interpretation, first draft, final draft. GLJ: mathematical models, data analysis and interpretation, contributed to first draft, final draft. APDP: data collection, contributed to first draft, final draft. JP: data collection, final draft. FT: study design, data collection, final draft. MT: funding, study design, data analysis and interpretation, contributed to first draft, final draft.

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Correspondence to Henry Goehlich.

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Financial interests: The authors declare they have no financial interests. Non-Financial interests: none; MT has served as Associate Editor for Marine Biology. All authors consent to the publication of this manuscript.

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This study did not require ethics approval.

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Responsible Editor: P. Ramey-Balci.

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Goehlich, H., Luna-Jorquera, G., Drapeau Picard, AP. et al. Seasonal growth rates of gooseneck barnacles (Lepas spp.): Proxies for floating time of rafts in marine ecosystems. Mar Biol 171, 36 (2024). https://doi.org/10.1007/s00227-023-04336-8

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  • DOI: https://doi.org/10.1007/s00227-023-04336-8

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