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A Survey of Selected Coral and Fish Assemblages Near the Waianae Ocean Outfall, Oahu, Hawaii, 1990-1999 (NODC Accession 0000794)

Metadata Updated: May 10, 2024

During 1990-1999, coral growth and fish abundance were monitored at stations located at and in the vicinity of the Waianae Ocean Outfall. Comparisons of results with fish surveys showed no significant differences in the species composition or relative abundances of fish populations at Station W-2 (the sunken ship Mahi), which is located 1.2 km south of the diffuser. Fish abundance and species richness increased at Station W- 3, which is located at the diffuser, from 1990 to 1995, decreased in 1996, and increased again in 1997 through 1999. At Station WW, an inshore station located 0.8 km from shore, fish were abundant and speciose on the armor rock covering the pipeline. The fish species seen inshore are comparable to fish species seen in similar (boulder) natural biotopes around Hawaii. There were no significant differences in total mean coral cover at selected quadrats from 1994 to 1999 at Station W-2. However, there was a significant increase (approximately 8%) in total mean coral cover at this station from 1991 to 1999. At the diffuser, corals were seen growing on the diffuser pipe and on the riser discharge ports. In 1986, when the diffuser began operation at a discharge rate of 1.5 mgd (0.07 m3/s), no corals were seen at this location. At inshore station WW, corals off the pipeline were sparsely distributed but were numerous and thriving on the armor rock over the pipeline. In 1998 the inshore transect (Alpha), off the armor rock, was covered (30%) with the alga Dictyopteris plagiogramma; however, in 1999 it disappeared. This seaweed was also abundant at this location in 1995, 1996, and 1997. The water was clear at all stations surveyed (13 to 20 m horizontal visibility), and the surrounding sediments were clean and white. No significant deleterious effect due to outfall operation and discharge were seen on the biological community at the stations surveyed. The increase in fish diversity and abundance at the diffuser since 1997 may be due to natural fluctuations in abundance or to environmental conditions suitable to the fish populations living there.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Date May 6, 2024
Metadata Created Date May 10, 2024
Metadata Updated Date May 10, 2024
Reference Date(s) (publication)
Frequency Of Update annually

Metadata Source

Harvested from CoRIS FGDC Metadata

Additional Metadata

Resource Type Dataset
Metadata Date May 6, 2024
Metadata Created Date May 10, 2024
Metadata Updated Date May 10, 2024
Reference Date(s) (publication)
Responsible Party Leeward Community College (Point of Contact)
Contact Email
Guid gov.noaa.crcp:fgdcmetadata_0000794
Access Constraints Use Constraints: Dataset credit required, Access Constraints: None
Bbox East Long -158.26
Bbox North Lat 21.43
Bbox South Lat 21.41
Bbox West Long -158.28
Coupled Resource
Frequency Of Update annually
Harvest Object Id b4923cfa-b521-404e-a44e-0e2e717272cd
Harvest Source Id d96f14c5-3e35-4b0a-a3b8-9392afeb50fa
Harvest Source Title CoRIS FGDC Metadata
Licence NOAA makes no warranty regarding these data,expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA, NESDIS, NODC and NCDDC cannot assume liability for any damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function on a particular system.
Lineage
Metadata Language eng; USA
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-158.28, 21.41], [-158.26, 21.41], [-158.26, 21.43], [-158.28, 21.43], [-158.28, 21.41]]]}
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 1990-10-20
Temporal Extent End 1999-08-31

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