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Domoic acid in a marine pelagic food web: Exposure of southern right whales Eubalaena australis to domoic acid on the Península Valdés calving ground, Argentina.

Authors
  • D'Agostino, Valeria C1
  • Degrati, Mariana2
  • Sastre, Viviana3
  • Santinelli, Norma3
  • Krock, Bernd4
  • Krohn, Torben4
  • Dans, Silvana L2
  • Hoffmeyer, Mónica S5
  • 1 Centro para el Estudio de Sistemas Marinos (CESIMAR), CCT CENPAT, CONICET, Boulevard Brown 2915, U9120ACV Puerto Madryn, Chubut, Argentina. Electronic address: [email protected] , (Argentina)
  • 2 Centro para el Estudio de Sistemas Marinos (CESIMAR), CCT CENPAT, CONICET, Boulevard Brown 2915, U9120ACV Puerto Madryn, Chubut, Argentina; Universidad Nacional de la Patagonia, San Juan Bosco, Boulevard Brown 3150, U9120ACV Puerto Madryn, Chubut, Argentina. , (Argentina)
  • 3 Facultad de Ciencias Naturales, Universidad Nacional de la Patagonia San Juan Bosco, Roca 115, 1er Piso, U9100AQC Trelew, Argentina. , (Argentina)
  • 4 Alfred Wegener Institut-Helmholtz Zentrum für Polar- und Meeresforschung, Chemische Ökologie, Am Handelshafen 12, 27570 Bremerhaven, Germany. , (Germany)
  • 5 Instituto Argentino de Oceanografía (IADO), CONICET-Bahía Blanca, Camino La Carrindanga Km 7.5, B8000FWB Bahía Blanca, Argentina; Facultad Regional Bahía Blanca, Universidad Tecnológica Nacional, 11 de Abril 461, B8000LMI Bahía Blanca, Argentina. , (Argentina)
Type
Published Article
Journal
Harmful algae
Publication Date
Sep 01, 2017
Volume
68
Pages
248–257
Identifiers
DOI: 10.1016/j.hal.2017.09.001
PMID: 28962985
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The gulfs that surround Península Valdés (PV), Golfo Nuevo and Golfo San José in Argentina, are important calving grounds for the southern right whale Eubalaena australis. However, high calf mortality events in recent years could be associated with phycotoxin exposure. The present study evaluated the transfer of domoic acid (DA) from Pseudo-nitzschia spp., potential producers of DA, to living and dead right whales via zooplanktonic vectors, while the whales are on their calving ground at PV. Phytoplankton and mesozooplankton (primary prey of the right whales at PV and potential grazers of Pseudo-nitzschia cells) were collected during the 2015 whale season and analyzed for species composition and abundance. DA was measured in plankton and fecal whale samples (collected during whale seasons 2013, 2014 and 2015) using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). The genus Pseudo-nitzschia was present in both gulfs with abundances ranging from 4.4×102 and 4.56×105 cell l-1. Pseudo-nitzschia australis had the highest abundance with up to 4.56×105 cell l-1. DA in phytoplankton was generally low, with the exception of samples collected during a P. australis bloom. No clear correlation was found between DA in phytoplankton and mesozooplankton samples. The predominance of copepods in mesozooplankton samples indicates that they were the primary vector for the transfer of DA from Pseudo-nitzschia spp. to higher trophic levels. High levels of DA were detected in four whale fecal samples (ranging from 0.30 to 710μgg-1 dry weight of fecal sample or from 0.05 and 113.6μgg-1 wet weight assuming a mean water content of 84%). The maximum level of DA detected in fecal samples (710μg DA g-1 dry weight of fecal sample) is the highest reported in southern right whales to date. The current findings demonstrate for the first time that southern right whales, E. australis, are exposed to DA via copepods as vectors during their calving season in the gulfs of PV. Copyright © 2017 Elsevier B.V. All rights reserved.

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