Data from: Effects of mistletoe (Phoradendron villosum) on California oaks

Mistletoes are a widespread group of plants often considered to be hemiparasitic, having detrimental effects on growth and survival of their hosts. We studied the effects of the Pacific mistletoe Phoradendron villosum, a member of a largely autotrophic genus, on three species of deciduous California oaks. We found no effects of mistletoe presence on radial growth or survivorship and detected a significant positive relationship between mistletoe and acorn production. This latter result is potentially explained by the tendency of Phoradendron villosum to be present on larger trees growing in nitrogen-rich soils or, alternatively, by a preference for healthy, acorn-producing trees by birds that potentially disperse mistletoe. Our results indicate that the negative consequences of Phoradendron presence on their hosts are negligible—this species resembles an epiphyte more than a parasite—and outweighed by the important ecosystem services mistletoe provides.Koenig_etal1,csvAcorn production, DBH, mean mistletoe abundance, and dendrometer growth by tree and year (one record for each year)Koenig_etal1.csvKoenig_etal2.csvMean acorn production, DBH, mean mistletoe abundance, and survival of trees (one record for each tree)Koenig_etal3.csvMean acorn production, DBH, mean mistletoe abundance, and ecological variables (one record for each tree)Funding provided by: National Science FoundationCrossref Funder Registry ID: http://dx.doi.org/10.13039/100000001Award Number: DEB-125639