Marine Benthic Invertebrates in Mamala Bay, Oahu, Hawaii 1994 (NODC Accession 9900151)

Metadata Updated: February 27, 2019

Planktonic larval stages of many benthic marine invertebrates are especially susceptible to environmental stress, such as the presence of pollution. Recruitment of these larvae onto the seafloor frequently controls benthic community structure. We thus evaluated larval availability and recruitment of macrobenthos over a period of 14 months at 12 stations within Mamala Bay, to assess the ecosystem impacts of major point and non-point sources of pollution. The major point source of pollution in the Bay, the Sand Island outfall, had no detectable negative impact on larval recruitment, even though the sewage plume frequently bathed our stations nearest the outfall. In contrast, larval availability and recruitment were significantly reduced at two study sites located 1 km west of the Pearl Harbor Channel (1 and 3 km offshore respectively). These two sites are likely bathed by a larval- depleted water mass whose source is not presently known. Possible sources include: 1) Pearl Harbor, whose outflow may be larval-depleted due to larval mortality caused by non-point source pollution, or the settlement of larvae inside Pearl Harbor before they are advected offshore (recruitment shadow), 2) offshore waters, or 3) coastal waters west of Pearl Harbor. It is difficult to determine the source(s) of waters bathing our offshore Pearl Harbor study sites because circulation patterns in the area are complicated by the convergence of semi-diurnal tidal flows located offshore of the area between Keehi Lagoon and the Honouliuli outfall (MB-6). The scale of hydrographic observations conducted as part of MB-6 were spatially too coarse to determine the location of the convergence therefore making it impossible to determine the source of water that most frequently bathes our western offshore Pearl Harbor study sites. Outflow from Keehi Lagoon produced a distinct, low-clarity water mass which appeared to enhance larval availability and recruitment of some taxa (especially balanomorph barnacles). Coral recruitment rates were extremely low across the bay (6 x 10-5 cm-2). Low coral recruitment rates are most likely due to inadequate larval supply since percent cover of live adult coral (coral larval source) is less than 5% throughout most of the bay. Coral recruitment rates observed in earlier studies in Maunalua Bay (located east of Diamond Head), which has similar live coral cover and few significant inputs of pollution, are also extremely low. This suggests that pollution inputs to Mamala Bay are not responsible for the observed low coral recruitment rates.

Access & Use Information

Downloads & Resources


Metadata Date June 20, 2018
Metadata Created Date February 7, 2018
Metadata Updated Date February 27, 2019
Reference Date(s) (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from NOAA CSW Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Date June 20, 2018
Metadata Created Date February 7, 2018
Metadata Updated Date February 27, 2019
Reference Date(s) (publication)
Responsible Party Department of Oceanography, University of Hawaii (Point of Contact)
Contact Email
Access Constraints Use Constraints: Dataset credit required, Access Constraints: None
Bbox East Long -157.82
Bbox North Lat 21.30
Bbox South Lat 21.25
Bbox West Long -157.98
Coupled Resource
Frequency Of Update notPlanned
Harvest Object Id a12f2670-6d3c-49ec-a78f-925173043979
Harvest Source Id 2aed8e29-fc5b-4cde-aa66-fb1118fd705e
Harvest Source Title NOAA CSW Harvest Source
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.
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 1994-02-01
Temporal Extent End 1994-08-01

Didn't find what you're looking for? Suggest a dataset here.