{"type": "FeatureCollection", "features": [{"id": "10.5061/dryad.54ht3", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:21:24Z", "type": "Dataset", "title": "Data from: Effects of plant diversity on the concentration of secondary plant metabolites and the density of arthropods on focal plants in the field", "description": "Open Access1. The diversity of the surrounding plant community can directly affect  the abundance of insects on a focal plant as well as the size and quality  of that focal plant. However, to what extent the effects of plant  diversity on the arthropod community on a focal plant are mediated by host  plant quality or by the diversity of the surrounding plants remains  unresolved. 2. In the field, we sampled arthropod communities on focal  Jacobaea vulgaris plants growing in experimental plant communities that  were maintained at different levels of diversity (1, 2, 4 or 9 species)  for three years. Focal plants were also planted in plots without  surrounding vegetation. We recorded the structural characteristics of each  of the surrounding plant communities as well as the growth, and primary  and secondary chemistry (pyrrolizidine alkaloids, PAs) of the focal plants  to disentangle the potential mechanisms causing the diversity effects. 3.  Two years after planting, the abundance of arthropods on focal plants that  were still in the vegetative stage decreased with increasing plant  diversity, while the abundance of arthropods on reproductive focal plants  was not significantly affected by the diversity of the neighbouring  community. The size of both vegetative and reproductive focal plants was  not significantly affected by the diversity of the neighbouring community,  but the levels of PAs and the foliar N concentration of vegetative focal  plants decreased with increasing plant diversity. Structural equation  modelling revealed that the effects of plant diversity on the arthropod  communities on focal plants were not mediated by changes in plant quality.  4. Synthesis. Plant quality can greatly influence insect preference and  performance. However, under natural conditions the effects of the  neighbouring plant community can overrule the plant quality effects of  individual plants growing in those communities on the abundance of insects  associated to this plant.", "keywords": ["Phytochemistry", "Jacobaea vulgaris", "plant\u2013herbivore interactions", "plant quality", "insect community", "plant species richness", "Verwerkte data", "phytochemistry", "Processed data", "15. Life on land", "plant-herbivore interactions", "biodiversity"], "contacts": [{"organization": "Kostenko, O., Mulder, P.P.J., Courbois, Matthijs, Bezemer, T.M.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5061/dryad.54ht3"}, {"rel": "self", "type": "application/geo+json", "title": "10.5061/dryad.54ht3", "name": "item", "description": "10.5061/dryad.54ht3", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5061/dryad.54ht3"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2016-01-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Phytochemistry&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Phytochemistry&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Phytochemistry&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Phytochemistry&offset=1", "hreflang": "en-US"}], "numberMatched": 1, "numberReturned": 1, "distributedFeatures": [], "timeStamp": "2026-05-26T12:05:42.541626Z"}