Productivity of forest birds at Hakalau Forest NWR

Technical Report HCSU-056
By: , and 



Hawai‘i has some of the most endangered avian species in the world, which face numerous threats from habitat loss, disease, climate change, and introduced species. This report details the results of a two-year productivity study of all forest bird species at Hakalau National Wildlife Refuge, Hawai‘i Island. We found and monitored nests from seven native species and three common non-native species of forest birds at three sites across the refuge. In addition to gathering important baseline information on productivity of forest birds, we examined differences in productivity between years, sites, and as a function of nest height. The weather differed greatly between the two years, with much more rain occurring in 2014. The daily survival rate (DSR) of nests was found to have an inverse relationship with the amount of rainfall, and accordingly was much lower in 2014 compared to 2013. Nest success was lower at a regenerating forest site compared with mature rainforest, indicating negative environmental factors affecting nest success may be exacerbated in reforested areas which have lower canopies. Nest success was also impacted by nest height, with a positive relationship in the drier 2013, and a negative relationship in 2014 for the canopy nesting honeycreepers. The large difference in weather and DSR between years illustrates the need for long term demographic studies that can capture the vital rates of this community of birds.

Study Area

Publication type Report
Publication Subtype Other Report
Title Productivity of forest birds at Hakalau Forest NWR
Series title Technical Report
Series number HCSU-056
Year Published 2014
Language English
Publisher University of Hawaii at Hilo
Contributing office(s) Pacific Island Ecosystems Research Center
Description iii., 21 p.
Country United States
State Hawaii
Other Geospatial Hakalau Forest National Wildlife Refuge
Online Only (Y/N) N
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
Additional publication details