(1975) Vegetational changes in the Galápagos Islands during the period 1966–73. (1989) The slow recovery of Opuntia megasperma on Espanola. (1981) Population fluctutations, tree rings and climate. Reunión del Consejo Ejecutivo de la Fundación Charles Darwin, Octubre 25 de 1990. (1990) The dynamics of Scalesia cordata (Asteraceae) in different habitats in Sierra Negra, Isabela, Galápagos. (1984) The giant tortoises: A natural history disturbed by Man. (1990) Bermanent vegetation quadrats in Galápagos.
Noticias de Galápagos 24, 26–8.Īdsersen, H. As a management experiment aimed at conserving the biological diversity of Pinta, it is proposed to reintroduce giant tortoises to the island, preceded and accompanied by a careful long-term monitoring of vegetational changes.Īdsersen, H. It is suggested that the absence of herbivores (the Pinta subspecies of giant tortoise is practically extinct, and feral goats were finally eradicated in 1990) in the long term may lead to decreased diversity in the vegetation of Pinta. After the elimination of large numbers of goats, Scalesia, Opuntia and Bursera were recovering rapidly, but the patterns of regeneration differed in accordance with differences in longevity, growth and seedling establishment. galapageia (Cactaceae) were close to a complete collapse, while stands of Bursera graveolens (Burseraceae) apparently were able to persist for a longer time. hopkinsii (Asteraceae) and Opuntia galapageia var. Data on vegetational changes on Pinta Island, Galápagos, collected during the period 1970–1988, show that feral goats have had a destructive impact on the vegetation.
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