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Lessons from a Tsunami in Hawai’i

A tsunami strikes Hawaiian islands with globally important seabird species; scientists can study its effects to better understand imminent ecological threats presented by sea level rise.

Earthquake-generated tsunamis can cause sudden flooding in coastal areas and islands. Damage to human health and infrastructure caused by past tsunamis is well-documented–but what happens to the affected region’s wildlife? In a study published in the journal “Ecology and Evolution” researchers traced the impact of the Tōhoku tsunami of March 2011 on island seabirds. The tsunami crashed ashore the some of the world’s largest remaining seabird nesting areas on Midway Atoll and Laysan Island in Hawai’i.

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Critically Endangered Laysan Ducks, also known as the Laysan Teal on Midway Atoll. Credit: Island Conservation

The tsunami struck at night and during peak nesting season for many internationally important seabirds. Twenty-three species of seabird were impacted by sudden flooding. On Laysan Island, the habitat loss caused by flooding negatively impacted the Endangered Laysan Duck. This Hawai’i-endemic bird is sensitive to ecosystem changes, and cannot pick up and move because it does not migrate or live anywhere else in the world. Scientists estimated that more than 275,000 nests belonging to Black-footed Albatross were also flooded and a large number of Near-threatened Laysan Albatross chicks were lost during the 2011 tsunami.

island-conservation-preventing-extinctions-Laysan-Albatross-seabird-species

Laysan Albatross chick on Midway Atoll. Credit: Island Conservation

Sea level rise will likely increase the frequency and intensity of sudden flooding events; understanding how native island species will fare is critical. John Klavitter, co-author on the study and manager for the U.S. Fish and Wildlife said:

We can better understand where the populations are most vulnerable to flooding, what proportions of the seabird populations are most vulnerable, and where restoration and invasive predator management may achieve the most long-term value.

Many seabird species living on islands are already struggling to survive. Native species will have lowered resilience against sea level rise if they have low populations due to invasive predators. However, it is difficult to predict exactly what will happen to island seabirds when sea level rise occurs.

A tsunami, although catastrophic, offers a meager silver lining in that it can help scientists further understand the unsettling reality many seabird species will continue to face. In this study researchers provide insight into potential long-term threats and the climate change resilience of Hawaiian seabirds. Scientists hope the information can help in the planning of restoration and conservation efforts on Midway Atoll and Laysan.

Sudden flooding events are predicted to increase. Protecting native seabirds from invasive species and discovering new ways to protect them from rising seas can support the mission of preventing extinctions.

Featured photo: Brown Noddies on Midway Atoll. Credit: Gregg Howald/Island Conservation
Source: U.S. Geological Survey

About John Brodie

John has recently received scholarship to enroll with Prescott College to study Marine Conservation via the Kino Bay Center in the Gulf of California. A storytelling career started while living in Sweden, searching for surf in the Baltic Sea. His writing and photography have since evolved into contributions in support of sustainable material efforts within the surf industry, publishing work with Patagonia and developing content for many-alike. New to Island Conservation, John is thrilled to join the communications team and to share the stories about saving island species from extinction. When not writing, you can find John and his dog surfing and camping along the West Coast.

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