caa a22 4500 445891068 CHVBK 20180317145616.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s10750-011-0784-3 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0784-3 Analysis of the reproductive strategy of Jenynsia multidentata (Cyprinodontiformes, Anablepidae) with focus on sexual differences in growth, size, and abundance [Elektronische Daten] [G. Goyenola, C. Iglesias, N. Mazzeo, E. Jeppesen] Jenynsia multidentata is one of the most abundant freshwater fishes in the subtropical region of South America and when abundant it appears to have a major impact on lake ecosystems function. We studied the life-history traits and population structure of J. multidentata in a shallow lake in Uruguay, and collected literature data along a subtropical to tropical freshwater gradient in South America. Our general focus was on reproductive strategy, particularly on sexual differences in growth, size and abundance. In Lake Blanca, we found strong reverse size dimorphism (RSD) and a feminized sex ratio. Both are attributed to sexual differences in growth patterns and longevity. RSD and a feminized sex ratio seem to characterise J. multidentata regardless of latitude, and together with other life traits such as small size, rapid growth, low age of maturity, the capacity of the females to keep sperm alive to fertilize several successive litters, high natural mortality and fertility, resistance to extreme environmental conditions and omnivory, they are indicative of high productivity to biomass ratio. The very high population growth rate helps to explain why fish removal, aiming to promote an increase in the zooplankton grazing pressure on phytoplankton, may not be a useful tool in eutrophic-turbid subtropical South American lakes. We also found that the duration of the breeding season deviated markedly with latitude, increasing towards the tropics, which may have major consequences for population growth rates and differential impact of this species on lake ecosystems in the different climate zones. Springer Science+Business Media B.V., 2011 Reproductive strategy nationallicence Reversed size dimorphism nationallicence Feminized sex ratio nationallicence Growth nationallicence Río de la Plata one-sided livebearer nationallicence Goyenola G. Ecología y Rehabilitación de Sistemas Acuáticos, Departamento de Ecología y Evolución, Centro Universitario Regional Este/Facultad de Ciencias, Universidad de la República, Maldonado, Uruguay aut Iglesias C. Ecología y Rehabilitación de Sistemas Acuáticos, Departamento de Ecología y Evolución, Centro Universitario Regional Este/Facultad de Ciencias, Universidad de la República, Maldonado, Uruguay aut Mazzeo N. Ecología y Rehabilitación de Sistemas Acuáticos, Departamento de Ecología y Evolución, Centro Universitario Regional Este/Facultad de Ciencias, Universidad de la República, Maldonado, Uruguay aut Jeppesen E. National Environmental Research Institute, Aarhus University, Vejlsøvej 25, 8600, Silkeborg, Denmark aut Hydrobiologia Springer Netherlands 673/1(2011-09-01), 245-257 0018-8158 673:1<245 2011 673 10750 https://doi.org/10.1007/s10750-011-0784-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0784-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Goyenola G. Ecología y Rehabilitación de Sistemas Acuáticos, Departamento de Ecología y Evolución, Centro Universitario Regional Este/Facultad de Ciencias, Universidad de la República, Maldonado, Uruguay aut NATIONALLICENCE 700 1- Iglesias C. Ecología y Rehabilitación de Sistemas Acuáticos, Departamento de Ecología y Evolución, Centro Universitario Regional Este/Facultad de Ciencias, Universidad de la República, Maldonado, Uruguay aut NATIONALLICENCE 700 1- Mazzeo N. Ecología y Rehabilitación de Sistemas Acuáticos, Departamento de Ecología y Evolución, Centro Universitario Regional Este/Facultad de Ciencias, Universidad de la República, Maldonado, Uruguay aut NATIONALLICENCE 700 1- Jeppesen E. National Environmental Research Institute, Aarhus University, Vejlsøvej 25, 8600, Silkeborg, Denmark aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 673/1(2011-09-01), 245-257 0018-8158 673:1<245 2011 673 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer