Effect of Didymosphenia geminata coverage on the phytobenthic community in an Andean basin of Chile
Abstract Background: The invasive diatom Didymosphenia geminata (Lyngbye) M. Schmidt has received considerable attention in recent years due to its rapid geographic expansion and massive proliferation, which have altered habitat availability for benthic species and triggered negative effects on str...
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Sociedad de Biología de Chile
2018
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oai:scielo:S0716-078X20180001002092019-06-20Effect of Didymosphenia geminata coverage on the phytobenthic community in an Andean basin of ChileFigueroa,FabiánPedreros,PabloCruces,FabiolaAbdala-Díaz,RobertoHernández,VíctorBecerra,JoséUrrutia,Roberto Rock snot Freshwater microalga Algal bloom Stream habitat Abstract Background: The invasive diatom Didymosphenia geminata (Lyngbye) M. Schmidt has received considerable attention in recent years due to its rapid geographic expansion and massive proliferation, which have altered habitat availability for benthic species and triggered negative effects on stream ecosystems. We evaluated the changes in the community structure of phytobenthos caused by the temporal variation in D. geminata coverage, in addition to the environmental variables correlated with the temporal variation of this invasive microalga in the Andean sector of the Biobio River basin, Chile. Methods: Environmental parameters were measured during the austral summer of 2014-2015, when phytobenthos samples were collected and used to develop a relative abundance matrix of taxa by calculating species richness and Shannon diversity. Multivariate techniques were used to establish the relationships among environmental variables, including D. geminata coverage, and the phytobenthic community. Results: Massive proliferation of D. geminata occurs during summer (December-January). According to multiple regression analysis, electrical conductivity, temperature and total phosphorus were the variables that best explained the variation in D. geminata coverage. When D. geminata coverage was over 50%, phytobenthic species richness was significantly higher than at the uninvaded site, without a significant change in Shannon diversity. In addition, the % coverage of this invasive microalga and total phosphorus concentration were variables that differentiated phytobenthic communities among the study sites. Conclusions: Environmental factors such as conductivity, temperature and total phosphorus concentration influenced the temporal variability of D. geminata mats. In addition, the massive growth of this invasive diatom caused a higher species richness without altering Shannon diversity. Our results suggest that the spatio-temporal variability of D. geminata correlated with environmental variables will help predict the habitat suitability of this alga in other Andean rivers and allow a better understanding of ecological habitat alterations.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.91 20182018-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2018000100209en10.1186/s40693-018-0080-y |
| institution |
Scielo Chile |
| collection |
Scielo Chile |
| language |
English |
| topic |
Rock snot Freshwater microalga Algal bloom Stream habitat |
| spellingShingle |
Rock snot Freshwater microalga Algal bloom Stream habitat Figueroa,Fabián Pedreros,Pablo Cruces,Fabiola Abdala-Díaz,Roberto Hernández,Víctor Becerra,José Urrutia,Roberto Effect of Didymosphenia geminata coverage on the phytobenthic community in an Andean basin of Chile |
| description |
Abstract Background: The invasive diatom Didymosphenia geminata (Lyngbye) M. Schmidt has received considerable attention in recent years due to its rapid geographic expansion and massive proliferation, which have altered habitat availability for benthic species and triggered negative effects on stream ecosystems. We evaluated the changes in the community structure of phytobenthos caused by the temporal variation in D. geminata coverage, in addition to the environmental variables correlated with the temporal variation of this invasive microalga in the Andean sector of the Biobio River basin, Chile. Methods: Environmental parameters were measured during the austral summer of 2014-2015, when phytobenthos samples were collected and used to develop a relative abundance matrix of taxa by calculating species richness and Shannon diversity. Multivariate techniques were used to establish the relationships among environmental variables, including D. geminata coverage, and the phytobenthic community. Results: Massive proliferation of D. geminata occurs during summer (December-January). According to multiple regression analysis, electrical conductivity, temperature and total phosphorus were the variables that best explained the variation in D. geminata coverage. When D. geminata coverage was over 50%, phytobenthic species richness was significantly higher than at the uninvaded site, without a significant change in Shannon diversity. In addition, the % coverage of this invasive microalga and total phosphorus concentration were variables that differentiated phytobenthic communities among the study sites. Conclusions: Environmental factors such as conductivity, temperature and total phosphorus concentration influenced the temporal variability of D. geminata mats. In addition, the massive growth of this invasive diatom caused a higher species richness without altering Shannon diversity. Our results suggest that the spatio-temporal variability of D. geminata correlated with environmental variables will help predict the habitat suitability of this alga in other Andean rivers and allow a better understanding of ecological habitat alterations. |
| author |
Figueroa,Fabián Pedreros,Pablo Cruces,Fabiola Abdala-Díaz,Roberto Hernández,Víctor Becerra,José Urrutia,Roberto |
| author_facet |
Figueroa,Fabián Pedreros,Pablo Cruces,Fabiola Abdala-Díaz,Roberto Hernández,Víctor Becerra,José Urrutia,Roberto |
| author_sort |
Figueroa,Fabián |
| title |
Effect of Didymosphenia geminata coverage on the phytobenthic community in an Andean basin of Chile |
| title_short |
Effect of Didymosphenia geminata coverage on the phytobenthic community in an Andean basin of Chile |
| title_full |
Effect of Didymosphenia geminata coverage on the phytobenthic community in an Andean basin of Chile |
| title_fullStr |
Effect of Didymosphenia geminata coverage on the phytobenthic community in an Andean basin of Chile |
| title_full_unstemmed |
Effect of Didymosphenia geminata coverage on the phytobenthic community in an Andean basin of Chile |
| title_sort |
effect of didymosphenia geminata coverage on the phytobenthic community in an andean basin of chile |
| publisher |
Sociedad de Biología de Chile |
| publishDate |
2018 |
| url |
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2018000100209 |
| work_keys_str_mv |
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