Mycorrhizal Fungi on the Galapagos Islands

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Abstract
A study was conducted to determine the presence and distribution of vesicular-arbuscular mycorrhizal (VAM) fungi in association with plants from different plant communities on Santa Cruz Island in the Galapagos Islands. VAM fungi were present to varying degrees in the roots of at least some members of all vegetation zones sampled. In the xerophytic regions sampled, there were little if any mycorrhizal fungi in the roots of the dominant, indigenous tree species. VAM spore numbers and levels of infection were generally higher in the moister regions of the island. In the moist zones, aggressive invading plants such as Cinchona succirubra and Psidium guajava had high levels of VAM infection.