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:LFCav6 (2020)  -  DOI: https://doi.org/10.3354/meps13315

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Effect of diet on breeders and inheritance in syngnathids: application of isotopic experimentally derived data to field studies

Miquel Planas1,*, Alexandro Chamorro1, Alex Paltrinieri1,2, Sara Campos1, Arturo Jiménez1, Killian Nedelec1,3, Jorge Hernández-Urcera1

1Department of Ecology and Marine Resources, Instituto de Investigaciones Marinas (CSIC), 36208 Vigo, Spain
2Dipartimento di Scienze della Vita e dell’Ambiente, Università Politecnica delle Marche, 60131 Ancona, Italy
3Ecole Supérieure d’Agriculture (ESA), 49000 Angers, France
*Corresponding author:

ABSTRACT: Syngnathids are vulnerable ovoviviparous fishes in which males undergo repeated brooding within a reproductive season. The isotopic effects of diet on both breeders (pooled sexes) and parent-egg transmission have been demonstrated in a few fish species but never in syngnathids. Quantifying isotopic changes due to diet is necessary to assess parent-newborn conversions and to estimate accurate trophic enrichment factors (TEF). We assessed the isotopic (δ13C and δ15N) effects of 3 experimental diets on TEFs in seahorse Hippocampus guttulatus breeders and isotopic inheritance. Our results suggest that H. guttulatus follows an income-capital continuum pattern for parent-egg transmission. The isotopic variability in diets for breeders and the resulting experimentally derived TEFs were compared with fixed TEFs from reviews to estimate their impact on the relative contribution of potential prey sources in syngnathids from the Cíes archipelago (Atlantic Islands National Park, NW Spain). We estimated source contributions using stable isotope mixing models (SIMMs) by combining prey sources into ecologically informative groups and incorporating informative priors. We demonstrate that (1) most frequently used TEFs from reviews might not be suitable for all fish species, particularly syngnathids, and (2) dietary source variability has a great effect on source contribution estimates. This study is also the first to provide specific TEFs for syngnathids.


KEY WORDS: Stable isotopes · Diet · Trophic enrichment factor · Inheritance · Syngnathidae · Prey sources · Cíes archipelago



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Cite this article as: Planas M, Chamorro A, Paltrinieri A, Campos S, Jiménez A, Nedelec K, Hernández-Urcera J (2020) Effect of diet on breeders and inheritance in syngnathids: application of isotopic experimentally derived data to field studies. Mar Ecol Prog Ser :LFCav6. https://doi.org/10.3354/meps13315

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