Pacific Island Ecosystems Research Center

Data and Tools

Filter Total Items: 100
Date published: March 18, 2019

Vegetation and ‘ōhi‘a mortality data collected during the 2016 survey of lower Puna, Hawai`i

Vegetation and ‘ōhi‘a mortality data collected during the 2016 survey of lower Puna District, Hawai`i. Data were collected at points along rural highways, secondary roads and residential streets where trained observers recorded the vegetation within a 50 m radius using the Jacobi (1989) rapid assessment. This description included tree crown cover, tree height, tree...

Date published: March 18, 2019

Point transect distance data from 2003 and 2016 surveys of lower Puna, Hawai`i

Point transect distance sampling data collected during the 2003 to 2016 surveys of lower Puna District, Hawai`i. Data were collected at points along rural highways, secondary roads and residential streets where trained observers recorded the detection type (heard, seen, or heard then seen) and horizontal distance (exact distance in m) from the station center point to individual birds detected...

Date published: March 18, 2019

Lower Puna, Hawai`i Island, bird and habitat surveys of 2003 and 2016

The newly identified rapid ‘ohi‘a death (ROD; Metrosideros polymorpha) originated in the lower Puna district and its distribution has spread across Hawai‘i Island. As ROD expands it is expected that the loss of the dominant tree species will adversely affect bird populations. This project is a first attempt to describe the relationship between the impacts of ROD...

Date published: January 1, 2019

Polyethylene Particle Detection (counts) during Environmental Sampler Comparison

We designed two new samplers for monitoring airborne particulates, including fungal and fern spores and plant pollen, that rely on natural wind currents (Passive Environmental Sampler) or a battery operated fan (Active Environmental Sampler). Both samplers are modeled after commercial devices such as the Rotorod® and the Burkard® samplers, but are more economical and require...

Date published: January 1, 2019

Ohia Dieback Study - Hawaii Island Canopy Status Assessment Table, 1977 - 2015

We analyzed very-high-resolution imagery to assess status of Metrosideros polymorpha forests across an 83,603 hectare study area that experienced extensive canopy dieback in the 1970s on the eastern side of the island of Hawaii. Using GIS we generated 1170 virtual vegetation plots with a 100 m radius; 541 plots in areas mapped in 1977 with trees dead or mostly defoliated (dieback), and 629...

Date published: January 1, 2019

Map of study area for canopy status assessment in 2015

This dataset describes the boundary of the study area used to analyze regeneration and change in status of native ohia forests in the wet habitat on the eastern side of the island of Hawaii. This area includes forests that were heavily impacted by landscape-level canopy dieback in the 1970s as well as forests that were not affected with tree canopy death or defoliation.

Date published: January 1, 2019

Ohia Dieback Study - 1977 Ground Survey Plot Locations

This data set provides the locations of the ground-based vegetation plots that have been used to assess the status of the ohia forests on the eastern side of the island of Hawaii following a landscape-level canopy dieback event that occurred in this area in the 1970s. These plots have been resurveyed several times and the results summarized by Boehmer et al. 2013.

Date published: January 1, 2019

Ohia Dieback Study - Dieback Model Results Table

Several previously published reports and geographic information system (GIS) data layers were used to code information on site attributes for each assessment plot using the spatial join tool in ArcMap. This information was used for an analysis of dieback and non-dieback habitat characteristics. The results of this analysis are presented in this table which depicts the probability of heavy to...

Date published: January 1, 2019

Ohia Dieback Study - Canopy Status Accuracy Assessment

This data set includes an accuracy assessment of the repeatability of identifying heavy to severe tree canopy dieback in virtual plots located within the Ohia Dieback 83,603 hectare study area.

Date published: January 1, 2019

Map of canopy dieback on Hawaii Island in 1977

This shapefile describes the canopy status and distribution of of ohia (Metrosideros polymorpha) forests on the eastern side of the island relative to a landscape-scale canopy dieback that impacted this area in the 1970s.

Date published: January 1, 2019

Hawaii Island Regeneration of Metrosideros polymorpha forests since landscape-level canopy dieback in the 1970s

We analyzed very-high-resolution imagery to assess status of Metrosideros polymorpha forests across an 83,603-hectare study area that experienced extensive canopy dieback in the 1970s on the eastern side of the island of Hawaii. Using GIS we generated 1,170 virtual vegetation plots with a 100-m radius; 541 plots in areas mapped in 1977 with trees dead or mostly defoliated (dieback), and 629...

Date published: January 1, 2019

Sphere Particle Measurements During Sampler Comparison

We designed two new samplers for monitoring airborne particulates, including fungal and fern spores and plant pollen, that rely on natural wind currents (Passive Environmental Sampler) or a battery operated fan (Active Environmental Sampler). Both samplers are modeled after commercial devices such as the Rotorod® and the Burkard® samplers, but are more economical and require...