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Filters: Tags: HawaiiRegion (X) > partyWithName: Susan M. Stedman (X)

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Major population centers exist on most of the islands, particularly on O’ahu which has a densely populated urban core. Urban sprawl increased by 76,000 acres from 1982 to 2012, which equals about two percent of Hawaii’s land mass. Urbanization results in physical loss of aquatic habitat as well as polluted runoff and altered hydrology. The Hawaiian Department of Health in 2015 listed sediment, nutrients, and bacteria as the most common threats to aquatic ecosystems and human health and that the vast majority of impaired sites are marine areas. Development contributes excessive sedimentation through improperly constructed roads and drainage systems, poor construction practices, and to nutrient loading through landscape...
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Several species of riparian plants including the non-native red mangrove ( Rhizophora mangle) and hau bush ( Hibiscus tiliaceus) proliferated along lower stream channels and estuary banks, disrupting energy flow in affected systems (a key fish habitat process). These invasive plants excessively shade estuarine shorelines, add large amounts of decomposing leaf litter that reduces water quality, create physical barriers to fish and invertebrate migration, and displace native fish and bird species. A pilot project in Wai ‘Opae, Hawai’i evaluated if red mangrove could be controlled and ultimately eradicated 20 acres of this plant. A cooperative Partnership project was initiated in 2015 to remove a large stand of invasive...
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Almost 46 percent of the land in Hawaii is agricultural and includes most of coastal Kaua’i, western Maui, and the perimeter of the island of Hawai’i, which are areas assessed to be at high risk of aquatic habitat degradation. The dominant agricultural products are corn, vegetables, nuts, potted and landscape plants, and cattle. Poor farming practices lead to excessive sedimentation due to open, cultivated soil being exposed to erosion from rainfall and cattle overgrazing and trampling stream banks. The United States Department of Agriculture reported that nearly 5 tons/acre of soil eroded from agricultural land in Hawaii during 2012, an amount that is similar to Central Midwest. Sediment transported from agricultural...
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Human-caused modifications to surface and ground water systems throughout Hawaii have drastically altered natural hydrologic regimes (a key fish habitat process), which in turn have profoundly limited the distribution and population sizes of native aquatic fauna. Most water for cities comes from wells, although stream water is used in Upper and East Maui. However, smaller communities and agriculture often rely on surface water obtained through diversions. Irrigation systems have been built to support the cultivation of row crops, such as corn, tomatoes, sugar cane, and nut trees. They transfer large volumes of water from natural watercourses and groundwater and into networks of ditches, tunnels, flumes, reservoirs,...
    map background search result map search result map Description of Agriculture as a Human Activity Affecting Fish Habitat in Hawaii Description of Reduced Water Flows as a Human Activity Affecting Fish Habitat in Hawaii Description of Urban Land Use as a Human Activity Affecting Fish Habitat in Hawaii Description of Invasive Vegetation as a Human Activity Affecting Fish Habitat in Hawaii Description of Agriculture as a Human Activity Affecting Fish Habitat in Hawaii Description of Reduced Water Flows as a Human Activity Affecting Fish Habitat in Hawaii Description of Urban Land Use as a Human Activity Affecting Fish Habitat in Hawaii Description of Invasive Vegetation as a Human Activity Affecting Fish Habitat in Hawaii