Marine debris accumulation in the Northwestern Hawaiian Islands: an examination of rates and processes.
Large amounts of derelict fishing gear accumulate and cause damage to shallow coral reefs of the Northwestern Hawaiian Islands (NWHI). To facilitate maintenance of reefs cleaned during 1996-2005 removal efforts, we identify likely high-density debris areas by assessing reef characteristics (depth, benthic habitat type, and energy regime) that influence sub-regional debris accumulation. Previously cleaned backreef and lagoonal reefs at two NWHI locations were resurveyed for accumulated debris using two survey methods. Accumulated debris densities and weights were found to be greater in lagoonal reef areas. Sample weight-based debris densities are extrapolated to similar habitats throughout the NWHI using a spatial 'net habitat' dataset created by generalizing IKONOS satellite derivatives for depth and habitat classification. Prediction accuracy for this dataset is tested using historical debris point data. Annual NWHI debris accumulation is estimated to be 52.0 metric tonnes. For planning purposes, individual NWHI atolls/reefs are allotted a proportion of this total.
Dameron
Oliver J
OJ
Joint Institute of Marine and Atmospheric Research and NOAA Fisheries Pacific Islands Fisheries Science Center, 1125B Ala Moana Boulevard, Honolulu, HI 96814, USA. oliver.dameron@noaa.gov
Parke
Michael
M
Albins
Mark A
MA
Brainard
Russell
R
D017753:Ecosystem; D004784:Environmental Monitoring; D040362:Geographic Information Systems; D005843:Geography; D006254:Hawaii; D009792:Oceans and Seas; D012307:Risk Factors; D017215:Satellite Communications; D013997:Time Factors; D014876:Water Pollution / Q000032:analysis*