Gibbs J. P., Marquez C., Sterling E. J., The role of endangered species reintroduction in ecosystem restoration: Tortoise-cactus interactions on Española Island, Galápagos, Restoration Ecology, 2008, 16(1):88-93, doi: 10.1111/j.1526-100X.2007.00265.x
A field analysis of the relationship between giant tortoises and tree-like prickly pears on Española in the Galápagos. Plant distribution, developmental classes, fruiting, woody vegetation and tortoise faeces are used to assess population recruitment after restoration measures.