Item talk:Q269927

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   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "Temporal dynamics of leafy spurge (Euphorbia esula) and two species of flea beetles (Aphthona spp.) used as biological control agents",
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       "value": 70027078
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       "value": "10.1016/S1049-9644(03)00156-7",
       "url": "https://doi.org/10.1016/S1049-9644(03)00156-7"
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       "value": "10499644"
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   "journal": {
     "@type": "Periodical",
     "name": "Biological Control",
     "volumeNumber": "29",
     "issueNumber": "2"
   },
   "inLanguage": "en",
   "isPartOf": [
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       "@type": "CreativeWorkSeries",
       "name": "Biological Control"
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   "datePublished": "2004",
   "dateModified": "2019-10-24",
   "abstract": "The goal of this study was to evaluate the biological control program of\u00a0leafy spurge\u00a0(Euphorbia esula) in a large natural area, Theodore Roosevelt National Park, western North Dakota, USA.\u00a0Aphthona lacertosa\u00a0and\u00a0Aphthona nigriscutis\u00a0have been released at more than 1800 points in the 18,600-ha South Unit of the park beginning in 1989; most releases have occurred since 1994. We established permanent vegetation plots throughout the infested area of the park and determined\u00a0stem\u00a0counts and\u00a0biomass\u00a0of leafy spurge and abundance of the two\u00a0flea beetle\u00a0species at these plots each year from 1999 to 2001. Both biomass and stem counts declined over the 3 years of the study. Both species of flea beetle are well established within the park and have expanded into areas where they were not released.\u00a0A. nigriscutis\u00a0was more abundant than\u00a0A. lacertosa\u00a0in the\u00a0grassland\u00a0areas we surveyed, but in all other habitats abundances were similar. Using structural equation models, only\u00a0A. lacertosa\u00a0could be shown to have a significant effect on counts of mature stems of leafy spurge.\u00a0A. nigriscutis\u00a0numbers were positively correlated with stem counts of mature stems. Previous year\u2019s stem counts had the greatest influence on change in stem counts over each 2-year time step examined with structural equation models.",
   "description": "8 p.",
   "publisher": {
     "@type": "Organization",
     "name": "Elsevier"
   },
   "author": [
     {
       "@type": "Person",
       "name": "Grace, J.B.",
       "givenName": "J.B.",
       "familyName": "Grace",
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         "value": "0000-0001-6374-4726",
         "url": "https://orcid.org/0000-0001-6374-4726"
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       "name": "Larson, D. L.",
       "givenName": "D. L.",
       "familyName": "Larson",
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         "value": "0000-0001-5202-0634",
         "url": "https://orcid.org/0000-0001-5202-0634"
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       "affiliation": [
         {
           "@type": "Organization",
           "name": "Northern Prairie Wildlife Research Center",
           "url": "https://www.usgs.gov/centers/northern-prairie-wildlife-research-center"
         }
       ]
     }
   ],
   "funder": [
     {
       "@type": "Organization",
       "name": "National Wetlands Research Center",
       "url": "https://www.usgs.gov/centers/wetland-and-aquatic-research-center"
     }
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       "name": "United States",
       "url": "https://geonames.org/4074035"
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       "name": "North Dakota"
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