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EcoHealth

, Volume 6, Issue 2, pp 279–286 | Cite as

Influence of Catastrophic Climatic Events and Human Waste on Vibrio Distribution in the Karnaphuli Estuary, Bangladesh

  • Rubén J. LaraEmail author
  • Sucharit B. Neogi
  • Mohammad S. Islam
  • Zahid H. Mahmud
  • Shinji Yamasaki
  • Gopinath B. Nair
Original Contribution

Abstract

Vibrios are bacteria of marine and estuarine origin that can cause human diseases, such as cholera, and also affect aquatic organisms. The impact of storm-driven changes in salinity and suspended particulate matter (SPM) on cultivable Vibrio counts (CVC) and distribution in Karnaphuli estuary, Bangladesh, was compared before and after a strong cyclone in mid May 2007 and after a monsoon landslide a month later. CVC were higher (~103 colony forming units—cfu/ml) at estuary’s mouth (salinity 20–15 parts per thousand, ppt) and steeply declined landwards. CVC and their proportion of total aerobic bacteria were highest after the cyclone and also increased after the landslide, likely due to higher SPM loads. The cyclone did not significantly change previous fecal coliform abundance, contrasting with the ten times increase after the landslide. Sewage input enhanced CVC near the point sources. CVC and salinity correlated highly significantly at salinities <10 ppt; however, at higher values dispersion increased, probably due to the effect of sediment resuspension on CVC. Cyclone or heavy rainfall-mediated turbidity changes jointly with salinity gradients can significantly influence abundance and distribution of estuarine vibrios. Extended salt intrusion and higher turbidities in tropical estuaries by stronger and more frequent storms and deforestation-derived erosion could favor Vibrio growth, with increasing risks for aquatic resources and human health in the coastal zone.

Key words

storms tropical estuaries vibrio salinity turbidity sediment 

Notes

Acknowledgements

This work was funded by the grant LA 868/5-1 from DFG/BMZ, Germany. We thank the Environmental Microbiology Laboratory of ICDDR, B, specially Iqbal Zahid, Sumi Akter, Md. Motin, Md. Hafiz Uddin, Partho Gope, and Debashish Paul for their support during sample collection and processing, and Dieter Peterke (ZMT) for his technical assistance.

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Copyright information

© International Association for Ecology and Health 2009

Authors and Affiliations

  • Rubén J. Lara
    • 1
    Email author
  • Sucharit B. Neogi
    • 2
    • 3
  • Mohammad S. Islam
    • 3
  • Zahid H. Mahmud
    • 3
  • Shinji Yamasaki
    • 2
  • Gopinath B. Nair
    • 4
  1. 1.Leibniz Zentrum für Marine TropenökologieBremenGermany
  2. 2.Graduate School of Life and Environmental SciencesOsaka Prefecture UniversitySakaiJapan
  3. 3.International Centre for Diarrhoeal Disease Research, BangladeshDhakaBangladesh
  4. 4.National Institute of Cholera and Enteric DiseasesKolkataIndia

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