Causal connections between water quality and land use in a rural tropical island watershed

Rural tropical island watershed analysis

Guy Ragosta, Carl Evensen, Edward R Atwill, Mark Walker, Tamara Ticktin, Adam Asquith, Kenneth W. Tate

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We examined associations between riparian canopy cover, presence or absence of cattle, rainfall, solar radiation, month of year, dissolved oxygen, turbidity, salinity, and Enterococcus concentrations in riparian surface soils with Enterococcus geometric mean in-stream water concentrations at Waipā watershed on the north side of the Hawaiian island Kaua'i. Each 1% decrease in riparian canopy cover was associated with a 4.6 most probable number (MPN)/100 ml increase of the geometric mean of Enterococcus in stream water (P < 0.05). Each unit decrease in salinity (ppt) was associated with an increase of Enterococcus by 68.2 MPN/100 ml in-stream water geometric mean concentrations (P < 0.05). Month of year was also associated with increases in stream water Enterococcus geometric mean concentrations (P < 0.05). Reducing riparian canopy cover is associated with Enterococcus increases in stream water, suggesting that decreasing riparian vegetation density could increase fecal bacteria surface runoff.

Original languageEnglish (US)
Pages (from-to)105-113
Number of pages9
JournalEcoHealth
Volume7
Issue number1
DOIs
StatePublished - Aug 2010

Fingerprint

Water Quality
Enterococcus
Islands
watershed
water quality
land use
Water
canopy
Salinity
water
salinity
riparian vegetation
turbidity
cattle
solar radiation
dissolved oxygen
soil surface
analysis
runoff
Soil

Keywords

  • Enterococci
  • streams
  • tropical islands

ASJC Scopus subject areas

  • Ecology
  • Health, Toxicology and Mutagenesis

Cite this

Causal connections between water quality and land use in a rural tropical island watershed : Rural tropical island watershed analysis. / Ragosta, Guy; Evensen, Carl; Atwill, Edward R; Walker, Mark; Ticktin, Tamara; Asquith, Adam; Tate, Kenneth W.

In: EcoHealth, Vol. 7, No. 1, 08.2010, p. 105-113.

Research output: Contribution to journalArticle

Ragosta, Guy ; Evensen, Carl ; Atwill, Edward R ; Walker, Mark ; Ticktin, Tamara ; Asquith, Adam ; Tate, Kenneth W. / Causal connections between water quality and land use in a rural tropical island watershed : Rural tropical island watershed analysis. In: EcoHealth. 2010 ; Vol. 7, No. 1. pp. 105-113.
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