Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe
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...
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10527613_v27_n1_p128_Lancelotti http://hdl.handle.net/20.500.12110/paper_10527613_v27_n1_p128_Lancelotti |
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paper:paper_10527613_v27_n1_p128_Lancelotti2023-06-08T16:02:59Z Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe Roesler, Carlos Ignacio 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 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. Fil:Roesler, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10527613_v27_n1_p128_Lancelotti http://hdl.handle.net/20.500.12110/paper_10527613_v27_n1_p128_Lancelotti |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 Roesler, Carlos Ignacio Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe |
| topic_facet |
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 |
| description |
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. |
| author |
Roesler, Carlos Ignacio |
| author_facet |
Roesler, Carlos Ignacio |
| author_sort |
Roesler, Carlos Ignacio |
| title |
Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe |
| title_short |
Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe |
| title_full |
Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe |
| title_fullStr |
Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe |
| title_full_unstemmed |
Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe |
| title_sort |
rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe |
| publishDate |
2017 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10527613_v27_n1_p128_Lancelotti http://hdl.handle.net/20.500.12110/paper_10527613_v27_n1_p128_Lancelotti |
| work_keys_str_mv |
AT roeslercarlosignacio rainbowtrouteffectsonzooplanktoninthereproductiveareaofthecriticallyendangeredhoodedgrebe |
| _version_ |
1768544094767808512 |