Fatty acid trophic markers and trophic links among seston, crustacean zooplankton and the siphonophore <em>Nanomia cara</em> in Georges Basin and Oceanographer Canyon (NW Atlantic)

Sergio Rossi; Marsh J. Youngbluth; Charles A. Jacoby; Francesc Pagès; Xènia Garrofé

doi:10.3989/scimar.2008.72n2403

Autores/as

Sergio Rossi Institut de Ciència i Tecnologia Ambientals, Universitat Autònoma de Barcelona
Marsh J. Youngbluth Harbor Branch Oceanographic Institution, Fort Pierce, Florida
Charles A. Jacoby Department of Fisheries and Aquatic Sciences, University of Florida
Francesc Pagès Institut de Ciències del Mar (CSIC), Barcelona
Xènia Garrofé Institut de Ciències del Mar (CSIC), Barcelona

DOI:

https://doi.org/10.3989/scimar.2008.72n2403

Palabras clave:

ácidos grasos, relaciones tróficas, sifonóforos, Golfo del Maine

Resumen

En este estudio se utilizaron las concentraciones de ácidos grasos (expresadas como porcentajes) para identificar posibles relaciones tróficas entre el seston, el estadio V (copepoditos) de Calanus finmarchicus, los adultos del eufáusido Meganyctiphanes norvegica, y el sifonóforo fisonecto Nanomia cara en Georges Basin y el cañón submarino Oceanographer durante Septiembre de 2003. En ambos lugares el seston era muy refractario y compuesto básicamente por ácidos grasos saturados. El fitoplancton no contribuyó de forma significativa a la composición de ácidos grasos del seston o de niveles tróficos superiores. Sólo cuatro ácidos grasos [14:0, 16:0, 16:1 (n–7) y 18:1 (n–7)] se transfirieron potencialmente del seston a C. finmarchicus o M. norvegica, lo que sugiere una débil conexión trófica entre estos eslabones de la cadena. Los ácidos grasos transferidos de las dos especies de zooplancton crustáceo a N. cara incluyen los mismos descritos más arriba y otros tres ácidos grasos poliinsaturados [20:3 (n–6), 20:5 (n–3) y 22:6 (n–3)] encontrados en concentraciones relativamente elevadas en ambos crustáceos. Además, tanto el 18:1 (n–9) (encontrado en elevadas concentraciones en M. norvegica) y los 18:0 y 18:2 (n–6) (encontrados en bajas concentraciones en ambas especies de crustáceos) se transfieren a N. cara. Los ácidos grasos demuestran ser una herramienta útil para identificar conexiones tróficas en N. cara.

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