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

Ragosta G, Evensen C, Atwill ER, Walker M, Ticktin T, Asquith A, Tate KW - Ecohealth (2010)

Bottom Line: 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).Reducing riparian canopy cover is associated with Enterococcus increases in stream water, suggesting that decreasing riparian vegetation density could increase fecal bacteria surface runoff.

View Article: PubMed Central - PubMed

Affiliation: Surfing Medicine International 501(c)(3), 5-5785A Kuhio Highway, Hanalei, HI 96714, USA. surfingmedicine@gmail.com

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.

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Predicted geometric mean Enterococcus (MPN/100 ml) concentrations as a function of canopy cover % and month with salinity set as 0.1 ppt.
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Fig3: Predicted geometric mean Enterococcus (MPN/100 ml) concentrations as a function of canopy cover % and month with salinity set as 0.1 ppt.

Mentions: Month (P = 0.041), canopy cover % (P = 0.006), and salinity (P = 0.004) were associated with the geometric mean of Enterococcus (MPN/100 ml) in water samples (Table 3). Each unit decrease in salinity (ppt) was associated with a 68.2 MPN/100 ml increase in the geometric mean of Enterococcus in-stream water concentrations (Table 3). Each 1% decrease in riparian canopy cover was associated with a 4.6 MPN/100 ml increase in the geometric mean of Enterococcus in water samples (Fig. 3). The linear mixed effects regression describing these relationships can be evaluated by comparison of predicted versus observed geometric mean per month of Enterococcus in water samples (Fig. 4). The predictive accuracy of the model decreased as the geometric mean of Enterococcus in-stream water concentrations increased (Fig. 4).Table 3


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

Ragosta G, Evensen C, Atwill ER, Walker M, Ticktin T, Asquith A, Tate KW - Ecohealth (2010)

Predicted geometric mean Enterococcus (MPN/100 ml) concentrations as a function of canopy cover % and month with salinity set as 0.1 ppt.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2914289&req=5

Fig3: Predicted geometric mean Enterococcus (MPN/100 ml) concentrations as a function of canopy cover % and month with salinity set as 0.1 ppt.
Mentions: Month (P = 0.041), canopy cover % (P = 0.006), and salinity (P = 0.004) were associated with the geometric mean of Enterococcus (MPN/100 ml) in water samples (Table 3). Each unit decrease in salinity (ppt) was associated with a 68.2 MPN/100 ml increase in the geometric mean of Enterococcus in-stream water concentrations (Table 3). Each 1% decrease in riparian canopy cover was associated with a 4.6 MPN/100 ml increase in the geometric mean of Enterococcus in water samples (Fig. 3). The linear mixed effects regression describing these relationships can be evaluated by comparison of predicted versus observed geometric mean per month of Enterococcus in water samples (Fig. 4). The predictive accuracy of the model decreased as the geometric mean of Enterococcus in-stream water concentrations increased (Fig. 4).Table 3

Bottom Line: 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).Reducing riparian canopy cover is associated with Enterococcus increases in stream water, suggesting that decreasing riparian vegetation density could increase fecal bacteria surface runoff.

View Article: PubMed Central - PubMed

Affiliation: Surfing Medicine International 501(c)(3), 5-5785A Kuhio Highway, Hanalei, HI 96714, USA. surfingmedicine@gmail.com

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.

Show MeSH
Related in: MedlinePlus