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Vulnerability of pejerrey Odontesthes bonariensis populations to climate change in pampean lakes of Argentina

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Abstract:

The vulnerability of the pejerrey Odontesthes bonariensis population in Lake Chasicó was assessed under different climate change conditions. During the sampling period, the water temperature was adequate for fish reproduction and to sustain an adequate sex ratio. Climate-driven higher temperatures, however, may severely distort population structure and cause drastic reduction or local extinction of stocks. Lake Chasicó can be classified as eutrophic with clear waters and cyanobacteria that regularly cause fish mortality were identified as Nodularia spumigena and Oscillatoria sp. Global warming may strengthen the effects of eutrophication (e.g. toxic blooms or anoxia). Since many Cyanophyta species tolerate higher temperatures better than other algae, toxic blooms could increase. Furthermore, cyanobacteria have low nutritional value and could decouple the low-diversity food web. Lake Chasicó has currently the salinity optimum (c. 20) for the development of the early life-history stages of O. bonariensis. Climate change, however, is likely to amplify the intensity of droughts or inundations. Floods can endanger O. bonariensis development due to its sub-optimal growth at low salinity and droughts could increase lake salinity and also temperature and nutrient concentration. In order to reduce some of the effects of climate change on the O. bonariensis population in Lake Chasicó, integrated basin management based on an eco-hydrological approach is proposed.

Keywords: Cyanophyta; climate scenarios; eutrophication; reproductive dysfunctions

Document Type: Regular Paper

DOI: http://dx.doi.org/10.1111/j.1095-8649.2010.02750.x

Affiliations: 1: Environmental Chemistry, Universidad Nacional del Sur, Av. Alem 1253, B8000CPB Bahía Blanca, Argentina 2: Marine Biosciences, Tokyo University of Marine Science and Technology, Konan 4-5-7 Minato-ku, Tokyo, Japan 3: Ecological Chemistry, Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany 4: Zooplankton Ecology and Taxonomy Laboratory, Biological Oceanography, Instituto Argentino de Oceanografía, Florida 8000. E1, B8000FWB Bahía Blanca, Argentina 5: Phycology and Mycology Laboratory, Universidad Nacional del Sur, San Juan 670, 8000 Bahía Blanca, Argentina 6: Wetland Biogeochemistry, Leibniz Center for Tropical Marine Ecology, Fahrenheitstrasse 6, 28359 Bremen, Germany

Publication date: November 1, 2010

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