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Title: Trophic position of lanternfishes (Pisces: Myctophidae) of the tropical and equatorial Atlantic estimated using stable isotopes
Authors: Olivar, M Pilar
Bode, Antonio
López-Pérez, Cristina
Hulley, P Alexander
Hernández León, Santiago Manuel 
Editors: Anderson, Emory
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Diet
Mesopelagic fish
Trophic relationships
Issue Date: 2019
Project: "Migradores y Flujo Activo en El Océano Atlántico" 
Biomasa y Flujo Activo en la Zona Batipelágica 
Journal: ICES Journal of Marine Science 
Abstract: Lanternfishes (Myctophidae) constitute the most important component of the daily vertically migrating mesopelagic fish community. This research addresses the estimation of the trophic position and diet of myctophids using stable isotope analyses. Fishes were collected across the central Atlantic, from a very productive zone influenced by the Mauritanian upwelling to the western oligotrophic equatorial waters. The survey also encompassed a zone of low oxygen concentration in the mesopelagic layers. Determinations of δ13C and δ15N values were made on the 20 most frequent and abundant myctophids, from small-sized species (e.g. Notolychnus valdivae) to larger ones (e.g. Myctophum punctatum). Isotope analyses on the seston and several plankton groups were also performed to assess the influence of zonal differences in trophic position (TP) calculations, and to use as food sources in diet estimations. Myctophids displayed a narrow range of trophic positions, being greater than 2 and less than 4, except for N. valdiviae (TP = 1.7). Comparisons of diets estimated through an isotopic mixing model differentiated the smallest species, with a strong seston signature (Diogenichthys atlanticus and N. valdiviae), from the Diaphus species of medium sizes, (D. brachycephalus, D. holti, and D. rafinesquii), which feed on prey of higher TP values.
ISSN: 1054-3139
DOI: 10.1093/icesjms/fsx243
Source: ICES Journal of Marine Science [ISSN 1054-3139], v. 76 (3), p. 649-661
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