Nutrient Fluxes from Water to Land: Seabirds Affect Plant Nutrient Status on Gulf of California Islands

• Published in: Oecologia Vol. 118; no. 3; pp. 324 - 332
• Main Authors: Anderson, Wendy B., Polis, Gary A.
• Format: Journal Article
• Language: English
• Published: Berlin Springer-Verlag 01.03.1999; Springer
• Subjects: Animal and plant ecology; Animal, plant and microbial ecology; Annuals; Aves; Biological and medical sciences; Birds; California Gulf; City states; Coastal ecology; Ecosystems Ecology; Fundamental and applied biological sciences. Psychology; Marine ecology; Nutrients; Plants; Sea birds; Soil nutrients; Soil plant interactions; Synecology; Terrestrial ecosystems; Gulf of California; Pacific Ocean; North Pacific; Cactaceae; Arid environment; Flux; Island; Chenopodiaceae; Trophic chain; Soils; Vertebrata; Food web; Animal community; Dicotyledones; Environment impact; Angiospermae; Nutrient; Spermatophyta; Atriplex; Feces; Aves; Opuntia; Seawater; Desert nutrients Opuntia; Key wordsAtriplex; Seabird guano; Spatial subsidies
• ISSN: 0029-8549; 1432-1939
• DOI: 10.1007/s004420050733

Energy and nutrient fluxes across habitat boundaries can exert profound direct and indirect effects on the dynamics of recipient systems. Transport from land to water is common and well studied; here, we document a less recognized process, substantial flows from water to land. On hyperarid, naturally nutrient poor islands in the Gulf of California, nutrient input via seabird guano directly increases N and P concentrations up to 6-fold in soils; these nutrients enrich plants. Nutrients in a long-lived cactus, a short-lived shrub, and annuals were 1.6- to 2.4-fold greater on bird versus nonbird islands. Because plant quality affects consumer growth and reproduction, we suggest that nutrient enrichment via guano ramifies to affect the entire food web on these islands.