caa a22 4500 445891416 CHVBK 20180317145617.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10750-010-0458-6 doi (NATIONALLICENCE)springer-10.1007/s10750-010-0458-6 Extensive diel fish migrations in a deep ultraoligotrophic lake of Patagonia Argentina [Elektronische Daten] [Magalí Rechencq, Alejandro Sosnovsky, Patricio Macchi, Pablo Alvear, Pablo Vigliano] Andean Patagonian lakes are ultraoligotrophic, highly transparent water bodies with very low densities of organisms at the different levels of their trophic food webs. Little is known about spatial distribution and habitat use by fish in these lakes. Hydroacoustic and active sampling techniques were used to study the distribution, composition, and displacement of organisms in an Andean lake throughout the diel cycle on two different moon phase days. Sound scattering layers (SSLs) were found both in the near-shore and pelagic habitats at different times of the day. These SSLs, formed by galaxiid larvae and adults, underwent displacement during the time periods of dawn and dusk, giving rise to the redistribution of organisms in the different habitats. The organisms show high sensitivity to light intensity, displaying different behaviors depending on moon phases. Extensive diel vertical migrations show that the deep pelagic habitats provide diurnal refuge for native galaxiids in Andean Patagonian lakes. Due to the high densities of galaxiid larvae and adults, it is likely that diel migrations generate an active flow of energy and matter between habitats, which could have a profound influence on whole lake dynamics. Springer Science+Business Media B.V., 2010 Diel migration nationallicence Ultraoligotrophic lake nationallicence Habitat coupling nationallicence Patagonia nationallicence Highly transparent lake nationallicence Fish behavior nationallicence Rechencq Magalí Grupo de Evaluación y Manejo de Recursos Ícticos (GEMARI), Centro Regional Universitario Bariloche (CRUB), Universidad Nacional del Comahue (UNCo), Quintral 1250, 8400, S. C. de Bariloche, Rio Negro, Argentina aut Sosnovsky Alejandro Grupo de Evaluación y Manejo de Recursos Ícticos (GEMARI), Centro Regional Universitario Bariloche (CRUB), Universidad Nacional del Comahue (UNCo), Quintral 1250, 8400, S. C. de Bariloche, Rio Negro, Argentina aut Macchi Patricio Grupo de Evaluación y Manejo de Recursos Ícticos (GEMARI), Centro Regional Universitario Bariloche (CRUB), Universidad Nacional del Comahue (UNCo), Quintral 1250, 8400, S. C. de Bariloche, Rio Negro, Argentina aut Alvear Pablo Grupo de Evaluación y Manejo de Recursos Ícticos (GEMARI), Centro Regional Universitario Bariloche (CRUB), Universidad Nacional del Comahue (UNCo), Quintral 1250, 8400, S. C. de Bariloche, Rio Negro, Argentina aut Vigliano Pablo Grupo de Evaluación y Manejo de Recursos Ícticos (GEMARI), Centro Regional Universitario Bariloche (CRUB), Universidad Nacional del Comahue (UNCo), Quintral 1250, 8400, S. C. de Bariloche, Rio Negro, Argentina aut Hydrobiologia Springer Netherlands 658/1(2011-01-01), 147-161 0018-8158 658:1<147 2011 658 10750 https://doi.org/10.1007/s10750-010-0458-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0458-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rechencq Magalí Grupo de Evaluación y Manejo de Recursos Ícticos (GEMARI), Centro Regional Universitario Bariloche (CRUB), Universidad Nacional del Comahue (UNCo), Quintral 1250, 8400, S. C. de Bariloche, Rio Negro, Argentina aut NATIONALLICENCE 700 1- Sosnovsky Alejandro Grupo de Evaluación y Manejo de Recursos Ícticos (GEMARI), Centro Regional Universitario Bariloche (CRUB), Universidad Nacional del Comahue (UNCo), Quintral 1250, 8400, S. C. de Bariloche, Rio Negro, Argentina aut NATIONALLICENCE 700 1- Macchi Patricio Grupo de Evaluación y Manejo de Recursos Ícticos (GEMARI), Centro Regional Universitario Bariloche (CRUB), Universidad Nacional del Comahue (UNCo), Quintral 1250, 8400, S. C. de Bariloche, Rio Negro, Argentina aut NATIONALLICENCE 700 1- Alvear Pablo Grupo de Evaluación y Manejo de Recursos Ícticos (GEMARI), Centro Regional Universitario Bariloche (CRUB), Universidad Nacional del Comahue (UNCo), Quintral 1250, 8400, S. C. de Bariloche, Rio Negro, Argentina aut NATIONALLICENCE 700 1- Vigliano Pablo Grupo de Evaluación y Manejo de Recursos Ícticos (GEMARI), Centro Regional Universitario Bariloche (CRUB), Universidad Nacional del Comahue (UNCo), Quintral 1250, 8400, S. C. de Bariloche, Rio Negro, Argentina aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 658/1(2011-01-01), 147-161 0018-8158 658:1<147 2011 658 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer