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This page last revised 05 AUG 2012 - S Gon III
TNC Action Sites
Maps & Figures
Typical lava setting of anchialine pools.
Older pools develop wetland vegetation.
Many pools were used for potable water.
In the Hawaiian High Islands ecoregion, anchialine pools have been reported from five islands -- Hawaiʻi, Maui, Molokaʻi, Oʻahu, and Kahoʻolawe. The island of Hawai`i clearly supports the majority of the state's anchialine resources: a total of more than 460 pools in about 80 sites have been identified on the ground, and an additional 54 sites (about 170 pools) have been viewed or photographed from the air.
This agrees with another published conservative estimate of 600-650 pools for this island. On the other islands, an additional 15 sites have been reported. However, very few (such as ʻĀhihi-Kīnaʻu, Maui and Lua o Palahemo, Hawaiʻi) have been systematically surveyed.
Threats to Anchialine Pools
Threats to anchialine pools include contamination of water sources, introduction of alien species, especially alien fish, and direct modification of substrate or filling. However, the effects of these changes are difficult to monitor. There are relatively few protected examples of anchialine pools, but some are present in ʻĀhihi-Kīnaʻu Natural Area Reserve (Maui), Manukā Natural Area Reserve (Hawaiʻi), and Hawaiʻi Volcanoes National Park.
Alien fish can greatly disrupt anchialine pools by suppressing native invertebrates, adding nutrients, and triggering large changes in algal communities.
Anchialine Pools of the Ecoregional Portfolio
The vast majority of anchialine pools in the ecoregion occur on the island of Hawai'i. Because of the limited number of anchialine pools found on other islands, all of them are included in the coastal portfolio.
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|Anchialine pools (in red dots) of the Hawaiian High Islands Ecoregion and aquifers with pools (in blue) are depicted below. |
Anchialine pools on O'ahu and selected aquifers with pools
Anchialine pools on Moloka'i and selected aquifers with pools
Anchialine pools on Kaho'olawe
Anchialine pools on Hawai'i island and selected aquifers with pools
Anchialine pools on Maui and selected aquifers with pools
Anchialine pools statewide
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