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Effects of size and sex on swimming performance and metabolism of invasive mosquitofish Gambusia holbrooki

In freshwater ecosystems, abiotic factors such as flow regime and water quality are considered important predictors of ecosystem invasibility. The aim of this study was to investigate the critical swimming capacity and metabolism of the eastern mosquitofish, Gambusia holbrooki, focusing on sex and size effects, to evaluate the influence of water flow on its invasive success. Specimens of mosquitofish were captured from the Ter Vell lagoon (L’Estartit, north-eastern Spain) in July 2014, and we measured the critical swimming speed (Ucrit) and oxygen consumption of individual fish (30 females and 30 males) using a mini swim tunnel. The mean Ucrit of this poeciliid fish was estimated at 14.11 cm·s-1 (range = 4.85-22.26), which is lower than that of many other fishes of similar size and confirms that this species is limnophilic and its invasive success might be partially explained by hydrologic alterations. However, the Ucrit and maximal metabolic rate vary markedly with fish size and sex, with males having much higher values for the same body mass, and thus probably being more resistant to strong water flows. Multiple regression models illustrate that multivariate analyses might increase the predictive power and understanding of swimming performance and metabolic traits, compared to results from conventional simple regressions

This research was supported by the Spanish Ministry of Economy and Competitiveness (project CGL2013-43822-R), the Government of Catalonia (ref. 2014 SGR 484), the European Commission (COST Action TD1209) and the Brazilian Ministry of Education (CAPES, ref. 88881.068352/2014-01). P.S. and Y.L. benefitted from fellowships from the European Commission (Erasmus Mundus Partnership ‘Techno’, 204323-1-2011-1-FR-EMA21)

© Ecology of Freshwater Fish, 2016, vol.26, núm. 3, p. 424-433

Consejo Superior de Investigaciones Científicas (CSIC)

Manager: Ministerio de Economía y Competitividad (Espanya)
Author: Srean, Pao
Almeida, David
Rubio Gracia, Francesc Manel
Luo, Yiping
Luo, Yiping
García-Berthou, Emili
Date: 2016 January 1
Abstract: In freshwater ecosystems, abiotic factors such as flow regime and water quality are considered important predictors of ecosystem invasibility. The aim of this study was to investigate the critical swimming capacity and metabolism of the eastern mosquitofish, Gambusia holbrooki, focusing on sex and size effects, to evaluate the influence of water flow on its invasive success. Specimens of mosquitofish were captured from the Ter Vell lagoon (L’Estartit, north-eastern Spain) in July 2014, and we measured the critical swimming speed (Ucrit) and oxygen consumption of individual fish (30 females and 30 males) using a mini swim tunnel. The mean Ucrit of this poeciliid fish was estimated at 14.11 cm·s-1 (range = 4.85-22.26), which is lower than that of many other fishes of similar size and confirms that this species is limnophilic and its invasive success might be partially explained by hydrologic alterations. However, the Ucrit and maximal metabolic rate vary markedly with fish size and sex, with males having much higher values for the same body mass, and thus probably being more resistant to strong water flows. Multiple regression models illustrate that multivariate analyses might increase the predictive power and understanding of swimming performance and metabolic traits, compared to results from conventional simple regressions
This research was supported by the Spanish Ministry of Economy and Competitiveness (project CGL2013-43822-R), the Government of Catalonia (ref. 2014 SGR 484), the European Commission (COST Action TD1209) and the Brazilian Ministry of Education (CAPES, ref. 88881.068352/2014-01). P.S. and Y.L. benefitted from fellowships from the European Commission (Erasmus Mundus Partnership ‘Techno’, 204323-1-2011-1-FR-EMA21)
Format: application/pdf
ISSN: 0906-6691 (versió paper)
1600-0633 (versió electrònica)
Document access: http://hdl.handle.net/10256/13007
Language: eng
Publisher: Consejo Superior de Investigaciones Científicas (CSIC)
Collection: MINECO/PE 2014-2016/CGL2013-43822-R
Reproducció digital del document publicat a: http://dx.doi.org/10.1111/eff.12286
Articles publicats (D-CCAA)
Is part of: © Ecology of Freshwater Fish, 2016, vol.26, núm. 3, p. 424-433
Rights: Tots els drets reservats
Subject: Invasions biològiques
Biological invasions
Animals invasors
Introduced organisms
Ecologia d’aigua dolça
Freshwater ecology
Peixos d’aigua dolça
Freshwater fishes
Gambusia holbrooki
Eastern mosquitofish
Title: Effects of size and sex on swimming performance and metabolism of invasive mosquitofish Gambusia holbrooki
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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