The research data generated for this thesis contains soil chemical data which was sampled from Broughton Island, New South Wales, Australia. Soils were analysed at the University of New England and Southern Cross University in New South Wales. The dataset was used to inform the research question how breeding seabirds affect the soil environment in terms of nutrient enrichment, carbon sequestration, and cycling of stable nitrogen and carbon isotopes. The data was used in chapters 3 and 4 in the thesis. Vegetation data used in chapter 5 was collected by the National Parks and Wildlife Service by surveying transect with plants and measuring species richness, plant cover, and height over several years of surveys.