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Hawaiian High Islands Ecoregion
This page last revised 05 December 2007 -- S.M.Gon III

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Worlds wettest regionsOne of the world's wettest regions lies in the Kaua'i montane system.

‘I‘iwi, a native honeycreeper
The 'i'iwi (Vestiaria coccinea) is abundant in the forests of the Kaua'i Conservation Area.

Rare natural community
The flora of Kaua'i boasts a high percentage of island-level endemism.

lobeliad, Kanaele
Kaua‘i Lobelia in Hawaiian Lowland Bog.

Kaua‘i Conservation Area Profile

Major Habitat Type: Tropical Moist Forest(Oceania Realm)

Stratification Unit:Kaua‘i (comprised of the islands of Kaua‘i and Ni‘ihau: islands of similargeological age). Kaua‘i Island in particular is noted for a high level of botanical endemism.

Island: Kaua‘i; the fourth largestisland of the archipelago, ca 5.5 million years old, maximum elevation 1598 m(5,243 ft), comprised of a single native-dominated landscape.

Significance: The Kaua‘i Conservation Area's ecological systems range from lowland to montaneelevations. The remote summit area maintains high viability systems, is animportant watershed, and provides stable habitat for native forest birds, and manynatural communities and species.  No other conservation area in Hawaii contains as many endemic species of flowering
plants (383 species). Kaua‘i also has a significant number ofviable, endemic bird species (12 species) and natural community types(36 types). 

ConservationStatus: The Kaua‘i Conservation Area is protected and managed by acombination of private and public protected areas, including the Kuia StateNatural Area Reserve, the Alaka‘i Wilderness Preserve, the State Forest ReserveSystem, and the state Conservation District. In late 2007, TNC's Wainiha Preserve was established within The Kaua‘i Watershed Alliance (KWA).The KWA is comprised of the above lands and selected lands ownedand/ormanaged by Kamehameha Schools; Princeville Corporation; Departmentof Water of the County of Kaua‘i; Kaua‘i Ranch, LLC; LihueLand Company; McBryde Sugar Company, Ltd.; State Department of Land andNatural Resources; Grove Farm Company, Incorporated; and Ben A. DyreFamily Limited Partnership. KWA drafted a management plan that implementsfencing, ungulate control, and weed control, ignoring land jurisdictionboundaries. The Nature Conservancy  coordinates plan implementation as a major action of its Kaua‘i strategies.

For more detailed information, contact the Kaua‘i Program of The Nature Conservancy of Hawai‘i.

lowland wet forest
Lowland Wet Forest, Lumaha‘i Valley, Northern Kaua‘i

Continuous Perennial Stream, Wainiha Valley
Hawaiian Continuous Perennial Stream, Wainiha Valley, Kaua'i




Conservation Targets:

Ecological Systems: Sixecological systems of Kaua‘i were selected as conservationtargets, each bearing nested natural communities and species (discussedbelow).

System Size Condition LC Overall
Montane Wet GOOD VERY GOOD VERY GOOD VERY GOOD
Montane Mesic FAIR FAIR GOOD FAIR
Lowland Wet VERY GOOD POOR FAIR FAIR
Lowland Mesic GOOD FAIR FAIR FAIR
Dry Cliff FAIR FAIR GOOD FAIR
Wet Cliff FAIR VERY GOOD VERY GOOD GOOD
Kaua'i Lowland Dry Systems have POOR viability and are not  included.

Natural Communities:

  • Continuous Perennial Stream Community
Selected stream occurrences: Kaua‘i bears manyhigh quality streams, and the four streams selected: Lumaha‘i, Limahuli, Waimea, and Hanakāpī‘ai Streams are among thelargest and highest quality streams on the island (Hawai‘i Stream As­ses­s­ment 1991). Eachbears a rich complement of native macrofauna and high volume, high qualitywater in a channel with high structural heterogeneity.

Special Ecological Features:

  • Forest Bird Concentration
The Kaua‘i Forest Bird Concentration is one ofthe most significant in the archipelago, bearing eight avian species, including fivetaxa endemic to the island, and two endangered species.
  • Waterbird Concentration
The Kaua‘i Waterbird Concentration is defined as fivecore wetlands and at least seven of nine wetland sites identified by the USFWSWaterbird Recovery Plan (2005). These include coastal, riverine, and uplandsites largely outside of the ecological system targets.

Nested Targets:

  • Natural Communities:
‘Ōhi‘a/Uluhe Lowland Wet Forest
‘Ōhi‘a/Mixed Shrub Lowland Wet Forest
‘Ōhi‘a/Mixed Shrub Montane Wet Forest
‘Ōhi‘a/‘Ōlapa Montane Wet Forest
Koa/‘Ōhi‘a Montane Mesic Forest
Kaua‘i Diverse Mesic Forest
Hawaiian Montane Bog
Hawaiian Lowland Bog
Mixed Fern/Shrub Wet Cliff Community
Mixed Shrub Dry Cliff Community

  • Native species:

There are manyconstituent native species that comprise the natural communities of the ConservationArea. Highlights include over 80 rare/endangered plant species, 383 endemicplant species, and an untold number of endemic invertebrate species likelynumbering in the thousands.

Major Threats:Uncontrolledferal ungulates (primarily pigs, goats, deer); and a large variety ofinvasivealien plants, particularly following hurricane ‘Iniki in 1991.Noteably, Kaua‘i is the only major island without mongoose (Herpestes auropunctatus), an important alien predator of native birds.
Thenative-dominated ecological systems of Kaua‘i  occupy itsremote and largely trackless central region, extending downward into areas (pink) converted into anthropogenic andalien-dominated regions.












Kaua'i SU

The conservation portfolio for the Island of Kaua'i includes the majority of  native-dominatedecological systems (dark green), and four occurrences of the Hawaiian continuous perennialstreams (Hanakāpī'ai, Limahuli, Lumaha'i, and Waimea) shown in light blue. Portfolio for the Island of Kaua'i
A crosssection of the Island of Kaua‘i indicates the variety of moistureand elevation conditions present: a montane wet summit plateau isflanked by both lowland wet (east) and mesic to dry systems (west). elevation and moisture settings of Kaua‘i