Effects of Water Removal on a Hawaiian Stream Ecosystem

dc.contributor.author Kinzie, Robert A. en_US
dc.contributor.author Chong, Charles en_US
dc.contributor.author Devrell, Julia en_US
dc.contributor.author Lindstrom, Dan en_US
dc.contributor.author Wolff, Reuben en_US
dc.date.accessioned 2012-05-08T21:59:59Z
dc.date.available 2012-05-08T21:59:59Z
dc.date.issued 2006-01 en_US
dc.description v. ill. 23 cm. en_US
dc.description Quarterly en_US
dc.description.abstract A 3-year study of Wainiha River on Kaua‘i, Hawai‘i, was carried out to determine the impact that water removal had on key stream ecosystem parameters and functions. The study area included a diversion dam for a hydroelectric plant that removes water at an elevation of 213 m and returns it to the stream about 6 km downstream at an elevation of 30 m. There were two highelevation sites, one with undiverted flow and one with reduced flow, and two low-elevation sites, one with reduced flow and one with full flow restored. Monthly samples were taken of instream and riparian invertebrates and plants. When samples from similar elevations were compared, dewatered sites had lower concentrations of benthic photosynthetic pigments than full-flow sites, and benthic ash-free dry mass (AFDM) was higher at the two low-elevation sites regardless of flow. Benthic chlorophyll a (chl a) and AFDM were higher in summer months than in the winter. Benthic invertebrate abundance was highest at the full-flow, low-elevation site and benthic invertebrate biomass was highest at the full-flow, high-elevation site. Season had only marginal effects on abundance and biomass of benthic invertebrates. Diversity of benthic invertebrates was higher at the more-downstream sites. Abundance of drifting invertebrates was highest at the site above the diversion dam and generally higher in winter than in summer months. Biomass of drifting invertebrates was also highest at the above-dam site but there was little seasonal difference. Almost all parameters measured were lowest at the site just downstream of the diversion dam. The biotic parameters responded only weakly to flows that had occurred up to 1 month before the measurements were made. Flow, elevation, and season interact in complex ways that impact ecosystem parameters and functions, but water diversion can override all these environmental factors. en_US
dc.format.extent 48 p. en_US
dc.identifier.citation Kinzie RA, Chong C, Devrell J, Lindstrom D, Wolff R. Effects of Water Removal on a Hawaiian Stream Ecosystem. Pac Sci 60(1): 1-48. en_US
dc.identifier.issn 0030-8870 en_US
dc.identifier.uri http://hdl.handle.net/10125/22546
dc.language.iso en-US en_US
dc.publisher Honolulu, University of Hawaii Press en_US
dc.relation.ispartofseries vol. 60, no.1 en_US
dc.subject.lcsh Natural history--Periodicals. en_US
dc.subject.lcsh Science--Periodicals en_US
dc.subject.lcsh Natural history--Pacific Area--Periodicals. en_US
dc.title Effects of Water Removal on a Hawaiian Stream Ecosystem en_US
dc.type Article en_US
dc.type.dcmi Text en_US
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