| Autor: |
Sarmiento-Lezcano AN; Instituto de Oceanografía y Cambio Global, IOCAG, Palmas de Gran Canaria, Unidad Asociada ULPGC-CSIC, Campus de Taliarte, Universidad de Las, 35214 Telde, Spain., Couret M; Instituto de Oceanografía y Cambio Global, IOCAG, Palmas de Gran Canaria, Unidad Asociada ULPGC-CSIC, Campus de Taliarte, Universidad de Las, 35214 Telde, Spain., Lombarte A; Institut de Ciències del MarCSIC, Passeig Marítim 37-49, 08003 Barcelona, Spain., Olivar MP; Institut de Ciències del MarCSIC, Passeig Marítim 37-49, 08003 Barcelona, Spain., Landeira JM; Instituto de Oceanografía y Cambio Global, IOCAG, Palmas de Gran Canaria, Unidad Asociada ULPGC-CSIC, Campus de Taliarte, Universidad de Las, 35214 Telde, Spain., Hernández-León S; Instituto de Oceanografía y Cambio Global, IOCAG, Palmas de Gran Canaria, Unidad Asociada ULPGC-CSIC, Campus de Taliarte, Universidad de Las, 35214 Telde, Spain., Tuset VM; Instituto de Oceanografía y Cambio Global, IOCAG, Palmas de Gran Canaria, Unidad Asociada ULPGC-CSIC, Campus de Taliarte, Universidad de Las, 35214 Telde, Spain. |
| Abstrakt: |
Most mesopelagic fishes perform large diel vertical migrations from the deep-sea zone to the surface. Although there is a trade-off between a higher food availability at the upper layers and an energy cost and predation risk, incursion towards the surface also implies a transport by currents, where the fish are exposed to a stranding risk on the coast. Here, we reported the first documented stranding of mesopelagic fishes along the southeast shore of Gran Canaria Island. Our study hypothesized that (1) the influence of the Canary Current, (2) the dominant incidence of the Trade Winds during summer, and (3) the presence of an upwelling filament coupled with an anticyclonic eddy south of Gran Canaria Island were the causative mechanisms of the strandings. Diaphus dumerilii (Myctophidae family) was the main species found as observed from an external morphological analysis using traditional taxonomy. The otolith contour analysis suggested the presence of other Diaphus spp. and Lobianchia dofleini . Nevertheless, the otolith morphological features described in the literature suggested that all the specimens were actually D. dumerelii . Errors in the identification were mainly due to the high intraspecific variability found in the otolith morphology. Even so, two patterns of oval and elliptic shapes were described with significant differences in its morphometry. |
