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Title: The contribution of migratory mesopelagic fishes to neuston fish assemblages across the Atlantic, Indian and Pacific Oceans
Authors: Olivar, M. Pilar
González-Gordillo, J. Ignacio
Salat, Jordi
Chust, Guillem
Cózar, Andrés
Hernández-León, Santiago 
Fernández De Puelles,María Luz 
Irigoien, Xabier
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Ichthyoneuston
Oceanic realm, et al
Issue Date: 2016
Publisher: 1323-1650
Project: Expedición de Circunnavegación Malaspina 2010: Cambio Global y Exploración Del Océano Global 
"Migradores y Flujo Activo en El Océano Atlántico" 
Journal: Marine and Freshwater Research 
Abstract: Surface waters are an attractive foraging ground for small fish in the open ocean. This study aims to determine the importance of vertically migrating species in the neuston of oceanic waters across the Atlantic, Indian and Pacific Oceans and to ascertain the influence of environmental variables on their distribution patterns. Neustonic fish assemblages were primarily controlled by light. They were dominated by late-larvae and juveniles of Exocoetidae, Hemiramphidae and Scomberesocidae during the day. At night, the vertical migration of mesopelagic species changed the dominance pattern in favour of Myctophidae and Scomberesocidae. The neustonic families’ distribution was primarily related to sea surface temperatures, whereas environmental variables at deeper layers were related to mesopelagic migrating families. Canonical correspondence analysis showed a low but statistically significant contribution of several environmental variables to myctophid species composition (10%), with minimum oxygen concentrations ranking first in variance explanation followed by maximum fluorescence, sea surface temperature and 400-m temperature. Spatial autocorrelation also explained 17% of the variance, indicating the influence of other factors such as historical, demographic and dispersal constraints. The low number of myctophid species in the North Pacific Equatorial Countercurrent appears to be related to the low oxygen concentrations observed in this province.
ISSN: 1323-1650
DOI: 10.1071/MF14391
Source: Marine and Freshwater Research [ISSN 1323-1650], v. 67, p. 1114-1127
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