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Spatio temporal population dynamics of the invasive diatom Didymosphenia geminata in central-southern Chilean rivers

Authordc.contributor.authorMontecino Banderet, Senta Viviana 
Authordc.contributor.authorMolina Paredes, María Ximena 
Authordc.contributor.authorBothwell, M. 
Authordc.contributor.authorMuñoz, P. 
Authordc.contributor.authorCarrevedo Goyra, María Laura 
Authordc.contributor.authorSalinas, F. 
Authordc.contributor.authorKumar, S. 
Authordc.contributor.authorCastillo, M. L. 
Authordc.contributor.authorBizama, Gustavo 
Authordc.contributor.authorBustamante Araya, Ramiro 
Cita de ítemdc.identifier.citationScience of the Total Environment 568 (2016) 1135–1145es_ES
Abstractdc.description.abstractWe document the distribution of Didymosphenia geminata in central-southern Chilean rivers and identify the chemical and physical factors associated with its presence/absence (p/a). Repeated surveys in five successive years provided evidence that D. geminata could be nearing a biogeographic equilibrium in the region. D. geminata databases from extensive biological and environmental surveys in 187 rivers, within ten catchments, south of 38 degrees S commenced in November 2010 and ran through May 2013. In addition, data from two other field surveys were used. The sites evenly distributed latitudinally were climatically characterized. The recent sampling program, following a published species distribution model, was designed to explore D. geminata distribution within thirteen catchments (34 degrees S-48 degrees S). An extensive river survey in 2014 (spring-summer) and in 2015 (autumn) included the p/a, and relative abundance of D. geminata cells in phytobenthos and in the drift. These p/a results showed that the probability of re-encountering D. geminata cells at sites where the species was previously found was significantly high while the probability of finding D. geminata cells at sites previously without the species was significantly low. This suggests that the distribution of D. geminata cells among suitable habitats was nearing completion. The relative abundance of D. geminata cells in the phytobenthos versus in the drift indicates seasonality with higher proportion of cells in the phytobenthos during the spring-summer than during the autumn. During the final surveys, principal component analysis of chemical and physical characteristics of rivers showed significant differences between rivers with and without D. geminata. Based on our observations of the distribution of D. geminata cells among rivers with suitable habitat conditions and the fluctuating rate of spread between rivers, we conclude that D. geminata is probably in the ending stage of its spatial demographic expansion in Chile surmounting the different barriers of the invasive process. (C) 2016 Elsevier B.V. All rights reservedes_ES
Patrocinadordc.description.sponsorshipUndersecretary of Fisheries SUBPESCA 2014-58 FIPA CORFO 11BPC10019INNOVA Institute of Ecology and Biodiversity (IEB), Chile ICM PO5-002es_ES
Type of licensedc.rightsAttribution-NonCommercial-NoDerivs 3.0 Chile*
Link to Licensedc.rights.uri*
Sourcedc.sourceScience of the Total Environmentes_ES
Keywordsdc.subjectAquatic invasionses_ES
Keywordsdc.subjectClimatic nichees_ES
Keywordsdc.subjectSpecies distribution modelses_ES
Keywordsdc.subjectPhytobenthonic diatoms and drifting algaees_ES
Títulodc.titleSpatio temporal population dynamics of the invasive diatom Didymosphenia geminata in central-southern Chilean riverses_ES
Document typedc.typeArtículo de revistaes_ES
Indexationuchile.indexArtículo de publicación ISIes_ES

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Attribution-NonCommercial-NoDerivs 3.0 Chile
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Chile