Use of LANDSAT MSS Imagery and Soil Type in a Geographic Information System to Assess Site‐Specific Risk of Fascioliasis on Red River Basin Farms in Louisiana

  • MALONE J
  • FEHLER D
  • LOYACANO A
 et al. 
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Abstract

A geographic information system (GIS) was constructed in an ERDAS
environment using maps of soil types from the USDA Soil Conservation
Service, LANDSAT satellite multispectral scanner data (MSS), boundaries
for 25 study farms, and slope and hydrologic features shown in a
two-quadrangle (USGS, 7.5') area in the Red River Basin near Alexandria,
Louisiana. Fecal sedimentation examinations were done in the fall
of 1989, spring of 1990, and fall and winter of 1990-1991 on 10-16
random samples per herd. Fecal egg shedding rates for F. hepatica
ranged from 10-100% prevalence and 0.3-21.7 eggs per two grams of
feces (EP2G). For Paramphistomum spp., a rumen fluke also transmitted
by F. bulimoides but not affected by flukicides, egg shedding rates
ranged from 10-91% prevalence and 0.1-42.8 EP2G. Soil types present
ranged from sandy loams to hydric, occasionally flooded clays. Herd
Paramphistomum spp. egg shedding rates increased with the proportion
of hydric clays present, adjusted for slope and major hydrologic
features. F. hepatica infection intensity followed a similar trend,
but were complicated by differing treatment practices. Results suggest
that earth observation satellite data and soil maps can be used,
with an existing climate forecast based on the Thornthwaite water
budget, to develop a second generation model that accounts for both
regional climate variation and site-specific differences in fascioliasis
risk based on soils prone to snail habitat.

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Authors

  • JOHN B. MALONE

  • DENNIS P. FEHLER

  • ALVIN F. LOYACANO

  • STANLEY H. ZUKOWSKI

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