Hydrological regulation of Vibrio dynamics in a tropical monsoonal estuary: a classification and regression tree approach.
Identifieur interne : 000028 ( Main/Exploration ); précédent : 000027; suivant : 000029Hydrological regulation of Vibrio dynamics in a tropical monsoonal estuary: a classification and regression tree approach.
Auteurs : Kiran Krishna [Inde] ; Vipindas Puthiya Veettil [Inde] ; Abdulaziz Anas [Inde] ; Shanta Nair [Inde]Source :
- Environmental science and pollution research international [ 1614-7499 ] ; 2020.
Abstract
Dynamics of Vibrio populations in aquatic environments are of concern, as they encompass members pathogenic to humans as well as marine flora and fauna. Spatiotemporal distribution of its culturable abundance for a range of physicochemical and biological parameters in the Cochin estuary (CE), one of the largest tropical monsoonal estuary along the southwest coast of India, witnessed a proliferation of this bacterial group (707 ± 196 CFU ml-1) in downstream stations during a relative dry period. The study for the first time employed classification and regression tree (CART) along with multiple linear regression (MLR) based approaches to explore the nonlinear and linear interactions, respectively, among environmental variables regulating Vibrio abundance in CE. Both the techniques were on consensus to ascertain salinity as the primary determinant of Vibrio dynamics, during the entire sampling period regardless of the seasons, viz., dry and wet. Nevertheless, CART outperformed MLR in performance index, suggesting that in a dynamic system like estuaries, usage of the latter is limited by complex nonlinear relationships among environmental variables. According to CART, Vibrio proliferation observed in downstream stations of the estuary (salinity ≥ 13.4 psu) during a relative dry period was driven by eutrophication (dissolved inorganic phosphate ≥ 1.48 μM L-1) associated with reduced flushing resulting in an oxygen-limited environment (dissolved oxygen < 4.56 ml L-1), wherein phytoplankton production diverts to support microbes. Our results imply that anthropogenic activities and sea level rise in future may prompt Vibrio proliferation, to be a concern for public health and impinge on fisheries yield from tropical estuaries.
DOI: 10.1007/s11356-020-10486-9
PubMed: 32820445
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National Institute of Oceanography, Kochi, Kerala, 682018, India. krishna.kiran@nio.org.</nlm:affiliation><country xml:lang="fr">Inde</country><wicri:regionArea>Regional Centre, CSIR - National Institute of Oceanography, Kochi, Kerala, 682018</wicri:regionArea><wicri:noRegion>682018</wicri:noRegion></affiliation></author><author><name sortKey="Veettil, Vipindas Puthiya" sort="Veettil, Vipindas Puthiya" uniqKey="Veettil V" first="Vipindas Puthiya" last="Veettil">Vipindas Puthiya Veettil</name><affiliation wicri:level="1"><nlm:affiliation>Regional Centre, CSIR - National Institute of Oceanography, Kochi, Kerala, 682018, India.</nlm:affiliation><country xml:lang="fr">Inde</country><wicri:regionArea>Regional Centre, CSIR - National Institute of Oceanography, Kochi, Kerala, 682018</wicri:regionArea><wicri:noRegion>682018</wicri:noRegion></affiliation><affiliation wicri:level="1"><nlm:affiliation>National Centre for Polar and Ocean Research, Headland Sada, Vasco-da-Gama, Goa, 403804, India.</nlm:affiliation><country xml:lang="fr">Inde</country><wicri:regionArea>National Centre for Polar and Ocean Research, Headland Sada, Vasco-da-Gama, Goa, 403804</wicri:regionArea><wicri:noRegion>403804</wicri:noRegion></affiliation></author><author><name sortKey="Anas, Abdulaziz" sort="Anas, Abdulaziz" uniqKey="Anas A" first="Abdulaziz" last="Anas">Abdulaziz Anas</name><affiliation wicri:level="1"><nlm:affiliation>Regional Centre, CSIR - National Institute of Oceanography, Kochi, Kerala, 682018, India.</nlm:affiliation><country xml:lang="fr">Inde</country><wicri:regionArea>Regional Centre, CSIR - National Institute of Oceanography, Kochi, Kerala, 682018</wicri:regionArea><wicri:noRegion>682018</wicri:noRegion></affiliation></author><author><name sortKey="Nair, Shanta" sort="Nair, Shanta" uniqKey="Nair S" first="Shanta" last="Nair">Shanta Nair</name><affiliation wicri:level="1"><nlm:affiliation>CSIR - National Institute of Oceanography, Dona Paula, Goa, 403004, India.</nlm:affiliation><country xml:lang="fr">Inde</country><wicri:regionArea>CSIR - National Institute of Oceanography, Dona Paula, Goa, 403004</wicri:regionArea><wicri:noRegion>403004</wicri:noRegion></affiliation></author></analytic><series><title level="j">Environmental science and pollution research international</title><idno type="eISSN">1614-7499</idno><imprint><date when="2020" type="published">2020</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Dynamics of Vibrio populations in aquatic environments are of concern, as they encompass members pathogenic to humans as well as marine flora and fauna. Spatiotemporal distribution of its culturable abundance for a range of physicochemical and biological parameters in the Cochin estuary (CE), one of the largest tropical monsoonal estuary along the southwest coast of India, witnessed a proliferation of this bacterial group (707 ± 196 CFU ml<sup>-1</sup>) in downstream stations during a relative dry period. The study for the first time employed classification and regression tree (CART) along with multiple linear regression (MLR) based approaches to explore the nonlinear and linear interactions, respectively, among environmental variables regulating Vibrio abundance in CE. Both the techniques were on consensus to ascertain salinity as the primary determinant of Vibrio dynamics, during the entire sampling period regardless of the seasons, viz., dry and wet. Nevertheless, CART outperformed MLR in performance index, suggesting that in a dynamic system like estuaries, usage of the latter is limited by complex nonlinear relationships among environmental variables. According to CART, Vibrio proliferation observed in downstream stations of the estuary (salinity ≥ 13.4 psu) during a relative dry period was driven by eutrophication (dissolved inorganic phosphate ≥ 1.48 μM L<sup>-1</sup>) associated with reduced flushing resulting in an oxygen-limited environment (dissolved oxygen < 4.56 ml L<sup>-1</sup>), wherein phytoplankton production diverts to support microbes. Our results imply that anthropogenic activities and sea level rise in future may prompt Vibrio proliferation, to be a concern for public health and impinge on fisheries yield from tropical estuaries.</div></front></TEI><pubmed><MedlineCitation Status="Publisher" Owner="NLM"><PMID Version="1">32820445</PMID><DateRevised><Year>2020</Year><Month>08</Month><Day>21</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1614-7499</ISSN><JournalIssue CitedMedium="Internet"><PubDate><Year>2020</Year><Month>Aug</Month><Day>21</Day></PubDate></JournalIssue><Title>Environmental science and pollution research international</Title><ISOAbbreviation>Environ Sci Pollut Res Int</ISOAbbreviation></Journal><ArticleTitle>Hydrological regulation of Vibrio dynamics in a tropical monsoonal estuary: a classification and regression tree approach.</ArticleTitle><ELocationID EIdType="doi" ValidYN="Y">10.1007/s11356-020-10486-9</ELocationID><Abstract><AbstractText>Dynamics of Vibrio populations in aquatic environments are of concern, as they encompass members pathogenic to humans as well as marine flora and fauna. Spatiotemporal distribution of its culturable abundance for a range of physicochemical and biological parameters in the Cochin estuary (CE), one of the largest tropical monsoonal estuary along the southwest coast of India, witnessed a proliferation of this bacterial group (707 ± 196 CFU ml<sup>-1</sup>) in downstream stations during a relative dry period. The study for the first time employed classification and regression tree (CART) along with multiple linear regression (MLR) based approaches to explore the nonlinear and linear interactions, respectively, among environmental variables regulating Vibrio abundance in CE. Both the techniques were on consensus to ascertain salinity as the primary determinant of Vibrio dynamics, during the entire sampling period regardless of the seasons, viz., dry and wet. Nevertheless, CART outperformed MLR in performance index, suggesting that in a dynamic system like estuaries, usage of the latter is limited by complex nonlinear relationships among environmental variables. According to CART, Vibrio proliferation observed in downstream stations of the estuary (salinity ≥ 13.4 psu) during a relative dry period was driven by eutrophication (dissolved inorganic phosphate ≥ 1.48 μM L<sup>-1</sup>) associated with reduced flushing resulting in an oxygen-limited environment (dissolved oxygen < 4.56 ml L<sup>-1</sup>), wherein phytoplankton production diverts to support microbes. 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