Spatial and temporal distribution of landlocked Galaxias maculatus and Galaxias platei (Pisces, Galaxiidae) in a lake in South American Andes
JUAN PABLO BARRIGA; MIGUEL A. BATTINI; PATRICIO J, MACCHI; DANIELA MILANO; VÍCTOR E, CUSSAC
NEW ZEALAND JOURNAL OF MARINE AND FRESHWATER RESEARCH
Royal Society of New Zealand
Lugar: Wellington, New Zealand; Año: 2002 vol. 36 p. 345 - 359
Abstract Galaxiids are present in many of the Andean lakes in southern South America. We stud-ied landlocked Galaxias maculatus (Jenyns) and Galaxias platei Steindachner populations in a deep oligotrophic lake (Lake GutiÈrrez, Patagonia, Argentina). Their temporal and spatial distribution, intralacustrine movements (horizontal and vertical), and spawning periods were analysed using several sampling techniques (ichthyoplankton net, seine net, gill net, and baited benthic traps). We identified the early life stages of both species based on their morphology and otolith shape. The free embryos of both species migrate to the limnetic zone, where theycoexist as larvae, facing the same food availability and probably the same predation risk. Each species then moves on to its own juvenile and adult habitat: the littoral and benthic zone for G. maculatus and only the deeper benthic zone for G. platei. Their adult habitats and part of their spawning periods partly overlap.