Management

Graphic saying "The Plans"

Hawaiʻi Coastal Resilience at PRiMO 2020

Hawaiʻi Sea Grant helped to organize an interactive session for the 2020 PRiMO Conference on coastal resilience planning across the islands. Come inside to read about the event from the perspective of one of our Grau Fellows!
Small plants are growing in numerous pots in a laboratory setting

Vulnerability of Coastal Ecosystems to Increased Salinity from Climate Change

PI: Kasey Barton
Critical Hawaiian coastal habitats are at risk from climate change impacts, particularly sea-level rise, which threaten protective coastal plant species. This work examines the salinity tolerance of native, and invasive, coastal plants to identify those in need of greater management and conservation action.
A water hazard sign sits near a beach

Tracking groundwater nutrients using novel tracers to inform coastal watershed management in South Kohala, Hawaiʻi

PI: Henrietta Dulai
Using a combination of nitrogen isotopes and microcontaminants as source tracers, this project aims to identify pathways of groundwater flow to the coastline along South Kohala, Hawaiʻi, tracing sources of groundwater contaminants and excess nutrients. Managers can use results to improve wastewater management and improve coral reef resilience.
A split image with the left showing a researcher adding dye to the top of a cesspool, and the right showing a natural rock-enclosed pool dyed green.

Identifying hot spots of sewage pollution in Hilo, Hawaiʻi

PI: Tracy Wiegner
Hawaiʻi banned new cesspools in 2015, but groundwater contamination from the remaining 8700 cesspools in the Hilo area is a continuing concern. This work will use dye tracer studies to track cesspool outflows and use sewage indicators to establish contaminant sources to coastal groundwaters to inform future management decisions.
Map view image showing 2/3 of pond-ringing mangrove removed between 2007 and 2017 and project sampling sites

Microbial biogeochemical cycling across a chronosequence of mangrove introductions across Hawaiʻi

PI: Rosanna Alegado
Invasive mangroves harm Hawaiian coastal ecosystems, choking native plants, providing footholds for invasives, and generating leaf litter mounds inedible to Hawaiian species. This study investigates whether microbial communities can evolve to tackle the detritus and examines the resilience of our coastal ecosystems to mangrove invasion.
Against the backdrop of the Pali mountainscape, a long line of volunteers prepare to plant

Enhancing social-ecological resilience and ecosystem services through restoration of coastal agroforestry systems

PI: Leah Bremer
Using ongoing restoration efforts at Heʻeia, Oʻahu, this research examines the ecological, economic, and cultural benefits of coastal agroforestry restoration in order to produce state-wide recommendations for prime locations to enhance biodiversity and ecosystem services of high interest to agencies, funding sources, and communities.
A view back towards land across the fishpond showing a cluster of trees on the shoreline next to a denuded area of very few mangrove trees

Effects of watershed restoration to traditional Hawaiian land use practices on health of nearshore coral reef ecosystems

PI: Robert Toonen
Reimplementation of traditional practices in the Heʻeia ahupuaʻa, in addition to invasive mangrove removal, has been predicted to support improvements to the coastal ecosystems of Kānoʻohe Bay. This study will examine effects on water quality and changes to coral reef health, in response to restoration efforts.
On a rocky shoreline, one student crouches next to a bucket while another stands ready to write on a clipboard

Differentiating treated and untreated wastewater contamination in a tropical coastal community using microbial community genomics

PI: Craig Nelson
There is growing concern that coastal ecosystems are threatened by sewage contamination of groundwaters. Using genomic methods, this project will examine the bacterial populations in the Keaukaha area of Hawaiʻi Island, to differentiate sources of contamination, and aid in management efforts to ameliorate sewage leakage.
Map view of coastline with super-composed thermal data showing locations of groundwater entry of ocean

Collaborative Study of Groundwater Transport Paths and Discharge Loads of Wastewaters and Other Land-Uses that Impact the Ewa Coastal Zones of West Oahu

PI: Craig Glenn
On-site sewage disposal systems threaten groundwater quality via the release of untreated sewage effluent to the environment. This work plans to use remote sensing techniques with field studies to establish groundwater flow paths and contaminant transport around Ewa Beach, Oʻahu, to aid in future remediation strategizing.