Comanaging fresh produce for nature conservation and food safety

Daniel S. Karp, Sasha Gennet, Christopher Kilonzo, Melissa Partyka, Nicolas Chaumont, Edward R Atwill, Claire Kremen

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

In 2006, a deadly Escherichia coli O157:H7 outbreak in bagged spinach was traced to California's Central Coast region, where >70% of the salad vegetables sold in the United States are produced. Although no definitive cause for the outbreak could be determined, wildlife was implicated as a disease vector. Growers were subsequently pressured to minimize the intrusion of wildlife onto their farm fields by removing surrounding noncrop vegetation. How vegetation removal actually affects foodborne pathogens remains unknown, however. We combined a fine-scale land use map with three datasets comprising ∼250,000 enterohemorrhagic E. coli (EHEC), generic E. coli, and Salmonella tests in produce, irrigation water, and rodents to quantify whether seminatural vegetation surrounding farmland is associated with foodborne pathogen prevalence in California's Central Coast region. We found that EHEC in fresh produce increased by more than an order of magnitude from 2007 to 2013, despite extensive vegetation clearing at farm field margins. Furthermore, although EHEC prevalence in produce was highest on farms near areas suitable for livestock grazing, we found no evidence of increased EHEC, generic E. coli, or Salmonella near nongrazed, seminatural areas. Rather, pathogen prevalence increased the most on farms where noncrop vegetation was removed, calling into question reforms that promote vegetation removal to improve food safety. These results suggest a path forward for comanaging fresh produce farms for food safety and environmental quality, as federal food safety reforms spread across ∼4.5 M acres of US farmland.

Original languageEnglish (US)
Pages (from-to)11126-11131
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume112
Issue number35
DOIs
StatePublished - Sep 1 2015

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Food Safety
Enterohemorrhagic Escherichia coli
Salmonella
Disease Outbreaks
Escherichia coli
Disease Vectors
Escherichia coli O157
Spinacia oleracea
Livestock
Vegetables
Rodentia
Farms
Water

Keywords

  • Agriculture
  • Biodiversity
  • Disease ecology
  • E. Coli
  • Foodborne pathogens

ASJC Scopus subject areas

  • General

Cite this

Comanaging fresh produce for nature conservation and food safety. / Karp, Daniel S.; Gennet, Sasha; Kilonzo, Christopher; Partyka, Melissa; Chaumont, Nicolas; Atwill, Edward R; Kremen, Claire.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, No. 35, 01.09.2015, p. 11126-11131.

Research output: Contribution to journalArticle

Karp, Daniel S. ; Gennet, Sasha ; Kilonzo, Christopher ; Partyka, Melissa ; Chaumont, Nicolas ; Atwill, Edward R ; Kremen, Claire. / Comanaging fresh produce for nature conservation and food safety. In: Proceedings of the National Academy of Sciences of the United States of America. 2015 ; Vol. 112, No. 35. pp. 11126-11131.
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