New Paper Shows Invasive Species Removal is a Nature-Based Solution for Climate Resilience
Island Conservation and partners have published a new paper quantifying ecosystem resilience on restored islands!
Restoring islands for nature and people worldwide.
Published on
August 6, 2019
Written by
Wieteke Holthuijzen
Photo credit
Wieteke Holthuijzen
Mention of Midway Atoll brings to mind myriads of birds. But, there’s more to Midway.
Known as Pihemanu (“loud din of birds” in Hawaiian), Midway Atoll National Wildlife Refuge is a bustling (and noisy) spectacle of seabird life. Midway holds the title as the world’s largest albatross colony, with more than 1.5 million albatross packed on its three tiny islands including 73% of the world’s Laysan Albatross population and more than one-third of the global Black-footed Albatross population. For 9 months of the year, albatross dominate and manage to occupy every bit of inhabitable space. But, both above and below, birdlife abounds. Bonin Petrels and Wedge-tailed Shearwaters /ʻUaʻu Kani build extensive, maze-like burrows underground while Red-footed Boobies /‘A and Great Frigatebirds /‘Iwa nest overhead in trees and shrubs.
In addition to albatross, more than 20 other bird species use Midway for nesting, including two federally-listed species: the Critically Endangered Short-tailed Albatross and Laysan Duck. Currently surviving in only three populations in the Northwestern Hawaiian Islands, Laysan Ducks have been pushed to the point of extinction several times, but have miraculously survived and recovered thanks to critical efforts by scientists and conservationists. In 2004-2005, 42 ducks were translocated to Midway to serve as a back-up population. Since then, Midway’s Laysan Duck population has soared to several hundred.
Since 1986, when Midway was designated as a Refuge, the atoll entered a new era of restoration and revitalization. Now, the migrations and breeding cycles of birds, seals, turtles, and flowering sequence of the islands’ plant life define the seasons on Midway.
Although birds inhabited Midway for centuries in isolation, birds have (more recently) shared the atoll with humans. Along with humans came the accidental introduction of invasive rats and mice which threatened native seabird populations. In 1995, conservationists removed invasive rats and effectively protected Midway’s wildlife. That was, until 2015 when researchers discovered that invasive mice were attacking adult and juvenile albatross.
To only meet Midway’s wildlife would ignore an equally interesting and biodiverse segment of the onshore ecosystem, a unique assemblage of biota brought to the atoll by wind and waves (and later, people). More than 160 plant species occur on the atoll, but only two dozen or so are considered native, or at least indigenous to the Hawaiian archipelago. Among gently sloping dunes, one can spot these low-growing forbs and patches of dense grasses. Bunchgrass / ʻEmoloa / Kāwelu (Eragrostis variabilis), a robust grass endemic to the Hawaiian Islands, is now one of the most common native plants across the atoll landscape, often used as a “warrior species” for erosion control and dune stabilization. Other notable species include abundant and densely growing coastal shrub Naupaka (Scaevola taccada), which encircles the islands; ‘Ilima (Sida fallax), which means “yellow” in Hawaiian, a low-growing plant with small bright golden flowers; and the perennial Sea Purslane / ʻĀkulikuli (Sesuvium portulacastrum), a pioneer species, growing on sunny, windy, sandy beaches, and coastal coralline areas.
These species provide important ecosystem services (such as soil stabilization and flooding control), as well as important nesting and foraging habitat for a variety of wildlife. But not all plants are so helpful. Golden Crown-beard (Verbesina encelioides) was and continues to be Midway’s Most Wanted. A notorious invasive species, Golden Crown-beard once carpeted the islands with chest-high, impenetrable thickets. Through concerted control efforts by USFWS staff, volunteers, and contractors, Golden Crown-beard now only covers about 1% of the atoll—another step towards restoring Midway as a robust seabird island ecosystem.
Today, one of the leading threats to Midway’s plant and animal biodiversity is the presence of invasive mice. In 2015, predatory, invasive mice began to attack and even kill adult and juvenile Laysan Albatross, putting the global population at risk. The U.S. Fish and Wildlife Service, the Papahānaumokuākea Marine National Monument, Island Conservation, and other partners are going to remove invasive mice in July 2020. We have already secured 85% of the funds necessary to save Midway, but we need your help with the remaining 15%.
Check out other journal entries we think you might be interested in.
Island Conservation and partners have published a new paper quantifying ecosystem resilience on restored islands!
Climate Week NYC: what is it and why is it important? Read on to find out why Island Conservation is attending this amazing event!
With sea levels on the rise, how are the coastlines of islands transforming? Read on to find out how dynamic islands really are!
Three Island-Ocean Connection Challenge projects in the Republic of the Marshall Islands bring hope for low-lying coral atolls!
A new article in Caribbean Ornithology heralds the success of one of our most exciting restoration projects: Desecheo Island, Puerto Rico!
Part 2 of filmmaker Cece King's reflection on her time on Juan Fernandez Island in Chile, learning about conservation and community!
Read about Nathaniel Hanna Holloway's experience doing marine monitoring in the Galápagos!
Part 1 of filmmaker Cece King's reflection on her time on Juan Fernandez Island in Chile, learning about conservation and community!
Read the account of citizen scientist Jim Torgerson's journey to Kamaka to help save Polynesian Storm-petrels!
Join us in celebrating the most amazing sights from around the world by checking out these fantastic conservation photos!