Native Hawaiian Streams & Bioassessment . Importance of streams to the Hawaiians Native stream creatures Bioassessment of Hawaiian Stream. Ancient Hawaiians placed a supreme value on water itself. The Hawaiian word for water is wai , Waiwai is the word for wealth or value.
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The Hawaiian word for water is wai,
Waiwai is the word for wealth or value.
Kumuwai means both the source of wealth as well as the source of a stream.
The translation of our concept of the watershed into Hawaiian is aina kumu wai or the land that is the source of the water.
Without clean and ample free flowing streams native plants and animals could not have survived.
Without these plants and animals, native Hawaiians could not prosper and be wealthy.
Waikaumalo Stream, Hawai\'iThe Importance of Water
2 species of crustacean (all endemic)
3 species of mollusk (all endemic).Animals Native to Hawaii
It is the most isolated landmass in the world.
The west coast of the U.S. is 2,400 miles away and Japan is 3,800 miles away
Hawaiian freshwater animals evolved from marine forms.
Isolation has resulted ina sparse freshwater fish populationGeographic Isolation
Numerous waterfalls. This feature gives the stream a steep profile.
Stream flow tracks rainfall pattern.
Freshets: short-duration, high-volume flows due to heavy rainfall
Life in Hawaiian streams have adapted to life in these highly energetic, sometimes violent, and ever changing environment .
Wailua Valley, Kaua\'iCharacteristics of Hawaiian Streams
These animals still maintain a strong dependence upon the sea.
Amphidromy: the adults live and breed in fresh water streams, while the newly hatched larvae swim out to sea and remain there for several months before returning to freshwater.
Hakalau Stream, Hawai\'iThe Mauka (mountain) to Makai (sea) Connection
The pelvic sucking disk also helps in maintaining position.
The ‘o‘opu nopili’s mouth has evolved to also act like a suction cup which aids in climbingClimbing Waterfalls
Creates physical barriers between streams and the open ocean.
Reduce available habitat and distorts the natural rhythm of water movement
Reduce flow which erodes the food base which supports native stream species in favor of less-preferred slow-water tolerant forms and other invasive species .Diversion of Water
Many of these species were intentionally released
Others were simply dumped in our streams with no thought given to possible consequences.Alien and Invasive Species
It is suggested that invasive species are transmitting parasites to native stream fishes.
How do we assess the health of our streams?Invasive Species
Riparian (streamside) vegetation is needed
Prevent the release of additional alien species into the stream
Keep the streams clean
Minimize pollutionWhat can you do?