Life history, population dynamics and production of eastern mosquitofish, Gambusia holbrooki (Pisces, Poeciliidae), in rice fields of the Lower Mondego River Valley, West Portugal.

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dc.contributor.authorCabral, João Alexandre
dc.contributor.authorMarques, João Carlos
dc.date.accessioned2015-03-17T15:48:50Z
dc.date.available2015-03-17T15:48:50Z
dc.date.issued1999
dc.description.abstractThe introduced population of Gambusia holbrooki from the rice fields of the lower Mondego River Valley, Portugal, was studied for 15 months, relating their life cycle and population dynamics with its production, in order to assess the role of the species in the energy flow and secondary production in this type of agro-ecosystem. Two main annual cohorts (1995 and 1996 cohorts) were identified. The females outnumbered males and the average female/male-ratio was 4. The inspection of ovary developmental stages of this viviparous fish, revealed that the most important reproductive period was between April and August. The first recruits were recorded in June and were present thereafter until October. Males from the parental cohort died before August, whereas parental females could survive until October. Mean adjusted fecundity (number of embryos divided by female standard length) peaked in July 1996 (0.95) and in June 1997 (1.05). Females reached greater sizes, had a higher growth rate and lived longer than males. Annual production was estimated at 3.101 g×m–2×year–1 (ash-free dry weight, AFDW), the average biomass at 2.896 g×m–2 (AFDW), and the P/B ratio was 1.071. A conjugation of life history, population dynamics, production and ecological traits (e.g. fast growth, reduced longevity, viviparity, high productivity, an intermediate position in food chain, and no special habitat requirements for reproduction) clearly show that the populations of G. holbrooki, introduced into rice fields all over the world, may play an important role in the structure and functioning of the biological communities of these important agro-ecosystems.pt
dc.identifier.citationCabral J. A. and Marques J. C., 1999pt
dc.identifier.otherdoi: 10.1016/S1146-609X(99)00102-2
dc.identifier.urihttp://hdl.handle.net/10348/4332
dc.language.isoengpt
dc.peerreviewedyespt
dc.relation.ispartofCITAB - Centro de Investigação e de Tecnologias Agro-Ambientais e Biológicaspt
dc.relation.ispartofseries20;6
dc.rightsrestricted accesspt
dc.subjectMosquitofishpt
dc.subjectGambusia holbrookipt
dc.subjectPoeciliidaept
dc.subjectGrowthpt
dc.subjectReproductionpt
dc.subjectPopulation dynamicspt
dc.subjectProductionpt
dc.titleLife history, population dynamics and production of eastern mosquitofish, Gambusia holbrooki (Pisces, Poeciliidae), in rice fields of the Lower Mondego River Valley, West Portugal.pt
dc.typejournal articlept
degois.publication.firstPage607pt
degois.publication.lastPage620pt
degois.publication.locationÉditions scientifiques et médicales Elsevier SASpt
degois.publication.titleActa Oecologicapt
dspace.entity.typePublicationen
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