Abundance and distribution of feral pigs at Hakalau Forest National Wildlife Refuge, 2010-2013

Technical Report HCSU-045
By: , and 



The Hakalau Forest Unit of the Big Island National Wildlife Refuge Complex has intensively managed feral pigs (Sus scrofa) and monitored feral pig presence with surveys of all managed areas since 1988. Results of all available data regarding pig management activities through 2004 were compiled and analyzed, but no further analyses had been conducted since then. The objective of this report was to analyze recent feral ungulate surveys at the Hakalau Forest Unit to determine current pig abundance and distribution. Activity indices for feral pigs, consisting of the presence of fresh or intermediate sign at 422 stations, each with approximately 20 sample plots, were compiled for years 2010–2013. A calibrated model based on the number of pigs removed from one management unit and concurrent activity surveys was applied to estimate pig abundance in other management units. Although point estimates appeared to decrease from 489.1 (±105.6) in 2010 to 407.6 (±88.0) in 2013, 95% confidence intervals overlapped, indicating no significant change in pig abundance within all management units. Nonetheless, there were significant declines in pig abundance over the four-year period within management units 1, 6, and 7. Areas where pig abundance remained high include the southern portion of Unit 2. Results of these surveys will be useful for directing management actions towards specific management units.

Study Area

Publication type Report
Publication Subtype Organization Series
Title Abundance and distribution of feral pigs at Hakalau Forest National Wildlife Refuge, 2010-2013
Series title Technical Report
Series number HCSU-045
Year Published 2013
Language English
Publisher Hawaii Cooperative Studies Unit - University of Hawaii at Hilo
Publisher location Hilo, HI
Contributing office(s) Pacific Island Ecosystems Research Center
Description iii, 9 p.
Time Range Start 2010-01-01
Time Range End 2013-12-31
Country United States
State Hawai'i
City Hilo
Other Geospatial Hakalau Forest National Wildlife Refuge
Google Analytic Metrics Metrics page
Additional publication details