Deposition of Cryptosporidium oocysts in streambeds

Kristin E. Searcy, Aaron I. Packman, Edward R Atwill, Thomas Harter

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

The transfer of Cryptosporidium oocysts from the surface water to the sediment beds of streams and rivers influences their migration in surface waters. We used controlled laboratory flume experiments to investigate the deposition of suspended Cryptosporidium parvum oocysts in streambeds. The experimental results demonstrate that hydrodynamic interactions between an overlying flow and a sediment bed cause oocysts to accumulate in the sediments and reduce their concentrations in the surface water. The association of C. parvum with other suspended sediments increased both the oocysts' effective settling velocity and the rate at which oocysts were transferred to the sediment bed. A model for the stream-subsurface exchange of colloidal particles, including physical transport and physicochemical interactions with sediment grains, accurately represented the deposition of both free C. parvum oocysts and oocysts that were attached to suspended sediments. We believe that these pathogen-sediment interactions play an important role in regulating the concentrations of Cryptosporidium in streams and rivers and should be taken into consideration when predicting the fate of pathogens in the environment.

Original languageEnglish (US)
Pages (from-to)1810-1816
Number of pages7
JournalApplied and Environmental Microbiology
Volume72
Issue number3
DOIs
StatePublished - Mar 2006

Fingerprint

Cryptosporidium
Oocysts
stream channels
oocysts
Cryptosporidium parvum
sediments
sediment
surface water
suspended sediment
Rivers
pathogen
Water
flume experiment
settling velocity
pathogens
river
Hydrodynamics
hydrodynamics
rivers

ASJC Scopus subject areas

  • Environmental Science(all)
  • Biotechnology
  • Microbiology

Cite this

Deposition of Cryptosporidium oocysts in streambeds. / Searcy, Kristin E.; Packman, Aaron I.; Atwill, Edward R; Harter, Thomas.

In: Applied and Environmental Microbiology, Vol. 72, No. 3, 03.2006, p. 1810-1816.

Research output: Contribution to journalArticle

Searcy, Kristin E. ; Packman, Aaron I. ; Atwill, Edward R ; Harter, Thomas. / Deposition of Cryptosporidium oocysts in streambeds. In: Applied and Environmental Microbiology. 2006 ; Vol. 72, No. 3. pp. 1810-1816.
@article{2bb1db0a711c4cdc994ffe0bc8708337,
title = "Deposition of Cryptosporidium oocysts in streambeds",
abstract = "The transfer of Cryptosporidium oocysts from the surface water to the sediment beds of streams and rivers influences their migration in surface waters. We used controlled laboratory flume experiments to investigate the deposition of suspended Cryptosporidium parvum oocysts in streambeds. The experimental results demonstrate that hydrodynamic interactions between an overlying flow and a sediment bed cause oocysts to accumulate in the sediments and reduce their concentrations in the surface water. The association of C. parvum with other suspended sediments increased both the oocysts' effective settling velocity and the rate at which oocysts were transferred to the sediment bed. A model for the stream-subsurface exchange of colloidal particles, including physical transport and physicochemical interactions with sediment grains, accurately represented the deposition of both free C. parvum oocysts and oocysts that were attached to suspended sediments. We believe that these pathogen-sediment interactions play an important role in regulating the concentrations of Cryptosporidium in streams and rivers and should be taken into consideration when predicting the fate of pathogens in the environment.",
author = "Searcy, {Kristin E.} and Packman, {Aaron I.} and Atwill, {Edward R} and Thomas Harter",
year = "2006",
month = "3",
doi = "10.1128/AEM.72.3.1810-1816.2006",
language = "English (US)",
volume = "72",
pages = "1810--1816",
journal = "Applied and Environmental Microbiology",
issn = "0099-2240",
publisher = "American Society for Microbiology",
number = "3",

}

TY - JOUR

T1 - Deposition of Cryptosporidium oocysts in streambeds

AU - Searcy, Kristin E.

AU - Packman, Aaron I.

AU - Atwill, Edward R

AU - Harter, Thomas

PY - 2006/3

Y1 - 2006/3

N2 - The transfer of Cryptosporidium oocysts from the surface water to the sediment beds of streams and rivers influences their migration in surface waters. We used controlled laboratory flume experiments to investigate the deposition of suspended Cryptosporidium parvum oocysts in streambeds. The experimental results demonstrate that hydrodynamic interactions between an overlying flow and a sediment bed cause oocysts to accumulate in the sediments and reduce their concentrations in the surface water. The association of C. parvum with other suspended sediments increased both the oocysts' effective settling velocity and the rate at which oocysts were transferred to the sediment bed. A model for the stream-subsurface exchange of colloidal particles, including physical transport and physicochemical interactions with sediment grains, accurately represented the deposition of both free C. parvum oocysts and oocysts that were attached to suspended sediments. We believe that these pathogen-sediment interactions play an important role in regulating the concentrations of Cryptosporidium in streams and rivers and should be taken into consideration when predicting the fate of pathogens in the environment.

AB - The transfer of Cryptosporidium oocysts from the surface water to the sediment beds of streams and rivers influences their migration in surface waters. We used controlled laboratory flume experiments to investigate the deposition of suspended Cryptosporidium parvum oocysts in streambeds. The experimental results demonstrate that hydrodynamic interactions between an overlying flow and a sediment bed cause oocysts to accumulate in the sediments and reduce their concentrations in the surface water. The association of C. parvum with other suspended sediments increased both the oocysts' effective settling velocity and the rate at which oocysts were transferred to the sediment bed. A model for the stream-subsurface exchange of colloidal particles, including physical transport and physicochemical interactions with sediment grains, accurately represented the deposition of both free C. parvum oocysts and oocysts that were attached to suspended sediments. We believe that these pathogen-sediment interactions play an important role in regulating the concentrations of Cryptosporidium in streams and rivers and should be taken into consideration when predicting the fate of pathogens in the environment.

UR - http://www.scopus.com/inward/record.url?scp=33644943755&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33644943755&partnerID=8YFLogxK

U2 - 10.1128/AEM.72.3.1810-1816.2006

DO - 10.1128/AEM.72.3.1810-1816.2006

M3 - Article

C2 - 16517626

AN - SCOPUS:33644943755

VL - 72

SP - 1810

EP - 1816

JO - Applied and Environmental Microbiology

JF - Applied and Environmental Microbiology

SN - 0099-2240

IS - 3

ER -