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Seasonal variability of stable isotope values and niche size in tropical calanoid copepods and zooplankton size fractions

Abstract

The seasonal variability of stable isotope values (δ15N and δ13C), ∆15N values, and niche width of calanoid copepod species, three zooplankton size fractions and seston were assessed from samples obtained monthly between January and December 2012 at a coastal sampling site in the Eastern Tropical Pacific off Mexico (19°09′03″ N, 104°44′50″ W). Twenty calanoid copepod species were analyzed, 15 of which were sampled in both the cool, productive ‘mixed’ period and the warm, oligotrophic ‘stratified’ period. While copepod δ15N and ∆15N values were higher during the mixed period, seston δ15N values did not differ between periods. The δ13C values indicated a seasonal difference between a priori-defined groups of oceanic and coastal copepod species. The seasonal variations of both the isotopic niche (Bayesian ellipses) values and Layman metrics in tropical copepods and zooplankton fractions suggested an opportunistic feeding strategy responding to the local coupled physical–biological seasonal processes. During the productive mixed period, the trophic web was more robust and stable, and a wider niche was observed. Contrary to commonly reported responses to environmental conditions, we found a more complex mesozooplankton food web during the productive period and a shorter web during the oligotrophic period, highlighting the importance of researching trophic dynamics in coastal tropical ecosystems.

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Data availability

All stable isotope data analyzed during the current study are available in the PANGAEA repository, https://doi.org/10.1594/PANGAEA.902824

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Acknowledgements

We thank crewmember A. Alvizar-Martínez for navigating the panga “Leon Marino” and his assistance with zooplankton sampling. Thanks to the reviewers who improved an earlier version of this manuscript. This project was funded by research grants from the Universidad de Guadalajara. The first author was granted a PhD scholarship (CONACyT 33487/229202). All authors are SNI fellows.

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Correspondence to Carmen Franco-Gordo.

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Kozak, E.R., Franco-Gordo, C., Godínez-Domínguez, E. et al. Seasonal variability of stable isotope values and niche size in tropical calanoid copepods and zooplankton size fractions. Mar Biol 167, 37 (2020). https://doi.org/10.1007/s00227-020-3653-7

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