INVESTIGADORES
DIEGUEZ Maria Del Carmen
artículos
Título:
Fishless shallow lakes of Southern Patagonia as habitat for waterbirds at the onset of trout aquaculture
Autor/es:
LANCELOTTI, J.L., POZZI, L.M., YORIO, P.M., DIEGUEZ, M.C. AND M.A. PASCUAL
Revista:
AQUATIC CONSERVATION-MARINE AND FRESHWATER ECOSYSTEMS
Editorial:
Wiley InterScience
Referencias:
Año: 2009 vol. 19 p. 497 - 505
ISSN:
1052-7613
Resumen:
shallow fishless lakes that are prime habitat for many species of waterbirds, including some considered ‘nearthreatened’. In recent years, several lakes have been stocked with trout which has created uncertainty about thepotential effects on the recipient ecosystem.2. Limnological and topographical analyses were performed in a group of 32 lakes of the Strobel Meseta inorder to characterize and classify individual lakes of the meseta based on their limnological and topographicfeatures, analyze the association between lake type and use by aquatic birds in general and by the endemichooded grebe (Podiceps gallardoi) in particular, and evaluate the overlap between trout aquaculture and criticalhabitat for waterbirds.3. The lakes were classified by multivariate analyses into four characteristic types: turbid, high conductivitylakes (T), small vegetated lakes (SV) and larger lakes which were subdivided into either vegetated (LV) orunvegetated (LU). In general, macrophyte cover was the main classificatory variable, whereas conductivity, pH,surface, and depth contributed moderately. Large vegetated lakes were generally found to be important forwaterbirds and provided critical habitat for the hooded grebe, whereas trout farmers largely favoured largeunvegetated lakes. However, since some large vegetated lakes have already been stocked, there is some level ofgeographical overlap between waterbird habitat and trout farming.4. The existence of some level of spatial segregation between production and critical waterbird habitat affordsopportunities for designing a spatially-based management system for trout aquaculture.Copyright r 2008 John Wiley & Sons Ltd.Received 4 April 2008; Revised 27 August 2008; Accepted 22 September 2008KEY WORDS: waterbird assemblages; hooded grebe; trout aquaculture; Strobel Meseta lakes; Patagonia; lake classification