dc.contributor.author Albuquerque, Rui dc.contributor.author Bode, Antonio dc.contributor.author González-Gordillo, Juan Ignacio dc.contributor.author Duarte, Carlos M. dc.contributor.author Queiroga, Henrique dc.date.accessioned 2021-02-22T08:29:19Z dc.date.available 2021-02-22T08:29:19Z dc.date.issued 2021-01-25 dc.date.submitted 2020-09-14 dc.identifier.citation Albuquerque, R., Bode, A., González-Gordillo, J. I., Duarte, C. M., & Queiroga, H. (2021). Trophic Structure of Neuston Across Tropical and Subtropical Oceanic Provinces Assessed With Stable Isotopes. Frontiers in Marine Science, 7. doi:10.3389/fmars.2020.606088 dc.identifier.issn 2296-7745 dc.identifier.doi 10.3389/fmars.2020.606088 dc.identifier.uri http://hdl.handle.net/10754/667566 dc.description.abstract The marine neuston, organisms living in the vicinity of the ocean surface, is one of the least studied zooplankton groups. Neuston occupies a restricted ecological niche and is affected by a wide range of endogenous and exogenous processes while also being a food source to zooplankton fish migrating from the deep layers and seabirds. In this study, the neustonic communities were characterized along the Malaspina global expedition sampling tropical and subtropical oceanic provinces using stable carbon and nitrogen isotopes to explore their trophic structure and relationships with environmental variables. The differences in stable isotopes mirrored the patterns in environmental characteristics of each province. High δ$^{13}$C values were associated with atmospheric carbon inputs, while the presence of dinoflagellates, coccolithophorids, and upwelling influence is related to low δ$^{13}$C values. Similarly, provinces presenting high δ$^{15}$N values were associated with denitrification and nitrate diffusive fluxes, whereas the presence of low δ$^{15}$N is attributable to nitrogen supplied through N2 fixation by diazotrophs. Neuston showed a large overlap among the isotopic niches of four functional groups, with chaetognaths and detritivores generally exhibiting a smaller degree of overlap compared to carnivores and omnivores/herbivores. These results support the hypothesis of a common trophic structure in the neuston community across the ocean. However, the size of the niche, small in coastal areas and those influenced by upwelling and large in oligotrophic regions, and their overlap, low in more productive provinces and high in oligotrophic provinces, may be associated with food availability. Small trophic niches are associated with a dominance of specialized over-opportunistic feeding in productive environments. dc.description.sponsorship We are grateful to all participants in the Malaspina expedition for their collaboration in plankton sampling and to A.F. Lamas for lab assistance with sample preparation. We also acknowledge the reviewers for their constructive comments and inputs which helped to improve this manuscript. Funding. This research was supported by project Malaspina-2010 (CSD2008-00077) funded by program CONSOLIDER-INGENIO 2010 (Ministerio de Ciencia e Innovación, Spain), by grant IN607A 2018/2 of the Axencia Galega de Innovación (GAIN, Xunta de Galicia, Spain). Thanks are also due to FCT/MCTES for the financial support to CESAM (UIDP/50017/2020+UIDB/50017/2020), through national funds. RA was supported by a Ph.D. fellowship funded by FCT (PD/BD/113483/2015). dc.publisher Frontiers Media SA dc.relation.url https://www.frontiersin.org/articles/10.3389/fmars.2020.606088/full dc.rights This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. dc.rights.uri https://creativecommons.org/licenses/by/4.0/ dc.title Trophic Structure of Neuston Across Tropical and Subtropical Oceanic Provinces Assessed With Stable Isotopes dc.type Article dc.contributor.department Biological and Environmental Science and Engineering (BESE) Division dc.contributor.department Marine Science Program dc.contributor.department Red Sea Research Center (RSRC) dc.identifier.journal Frontiers in Marine Science dc.eprint.version Publisher's Version/PDF dc.contributor.institution Departamento de Biologia, CESAM – Centro de Estudos do Ambiente e do Mar, Universidade de Aveiro, Aveiro, Portugal dc.contributor.institution Instituto Español de Oceanografía, Centro Oceanográfico de A Coruña, A Coruña, Spain dc.contributor.institution Instituto Universitario de Investigación Marina (INMAR), Campus de Puerto Real dc.identifier.volume 7 kaust.person Duarte, Carlos M. dc.date.accepted 2020-12-15 dc.identifier.eid 2-s2.0-85100690754 refterms.dateFOA 2021-02-22T08:30:17Z
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