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Abstract:

Aquaculture in arid Patagonia is potentially affecting the hooded grebe (Podiceps gallardoi), a critically endangered endemic waterbird. Exotic rainbow trout (Oncorhynchus mykiss) were stocked from 1994 in naturally fishless lakes, the primary reproductive habitat of this grebe. Trout and grebes are visual predators, whose diets overlap. Consequently, trout could reduce the abundance of prey of the hooded grebe. This study compared the size distribution and abundance of the pelagic zooplankton fraction preyed upon by trout in four fishless lakes and three lakes stocked with trout, including vegetated and unvegetated lakes. The mean size of Daphnia spp. was 45% and 35% larger in fishless lakes than in stocked lakes, for unvegetated and vegetated lakes, respectively. Boeckella spp. were larger in fishless than in stocked vegetated lakes. Fishless and stocked lakes had highly contrasting biomasses of large pelagic crustaceans. Amphipods were absent from the water column of all stocked lakes analysed, and were abundant in fishless lakes. Parabroteas sarsi was absent from the two large unvegetated lakes, stocked with trout. These shifts in the abundance and size spectrum of the zooplankton may reflect competition between trout and hooded grebe, affecting the survival of the latter species. The current conservation status of this rare aquatic bird demands the application of management tools to reduce the detrimental effects of aquaculture on their primary reproductive habitat. Copyright © 2016 John Wiley & Sons, Ltd. Copyright © 2016 John Wiley & Sons, Ltd.

Registro:

Documento: Artículo
Título:Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe
Autor:Lancelotti, J.; Marinone, M.C.; Roesler, I.
Filiación:Instituto Patagónico Para el Estudio de los Ecosistemas Continentales, Centro Nacional Patagónico (CENPAT-CONICET), Puerto Madryn, Chubut, Argentina
Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
Laboratorio de Ecología y Comportamiento Animal-Proyecto Macá Tobiano, Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA-CONICET), Facultad de Ciencias Exactas y Naturales, Argentina
Palabras clave:alien species; aquaculture; birds; endangered species; fish; lake; abundance; crustacean; endangered species; endemic species; invasive species; lake ecosystem; niche overlap; pelagic environment; salmonid culture; size distribution; survival; water column; waterfowl; zooplankton; Patagonia; Amphipoda; Aves; Boeckella; Crustacea; Daphnia; Oncorhynchus mykiss; Podiceps gallardoi; Podicipedidae; Salmonidae
Año:2017
Volumen:27
Número:1
Página de inicio:128
Página de fin:136
DOI: http://dx.doi.org/10.1002/aqc.2629
Título revista:Aquatic Conservation: Marine and Freshwater Ecosystems
Título revista abreviado:Aquatic Conserv. Mar. Freshw. Ecosyst.
ISSN:10527613
CODEN:AQCOE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10527613_v27_n1_p128_Lancelotti

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Citas:

---------- APA ----------
Lancelotti, J., Marinone, M.C. & Roesler, I. (2017) . Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe. Aquatic Conservation: Marine and Freshwater Ecosystems, 27(1), 128-136.
http://dx.doi.org/10.1002/aqc.2629
---------- CHICAGO ----------
Lancelotti, J., Marinone, M.C., Roesler, I. "Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe" . Aquatic Conservation: Marine and Freshwater Ecosystems 27, no. 1 (2017) : 128-136.
http://dx.doi.org/10.1002/aqc.2629
---------- MLA ----------
Lancelotti, J., Marinone, M.C., Roesler, I. "Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe" . Aquatic Conservation: Marine and Freshwater Ecosystems, vol. 27, no. 1, 2017, pp. 128-136.
http://dx.doi.org/10.1002/aqc.2629
---------- VANCOUVER ----------
Lancelotti, J., Marinone, M.C., Roesler, I. Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe. Aquatic Conserv. Mar. Freshw. Ecosyst. 2017;27(1):128-136.
http://dx.doi.org/10.1002/aqc.2629