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Hawaiian monk seal population surpasses 1,500 for the first time in more than 20 years, NOAA says

20220414LM RN58 & PO5 D1 (63).JPG
Lesley Macpherson
Hawaiʻi Department of Land and Natural Resources
On April 14, 2022, Lesley Macpherson of the DLNR Division of State Parks documented her sixth seal birth. She recorded veteran mother RN58 give birth to PO5, the fifth pup born on O‘ahu this year.

HONOLULU — The population of endangered Hawaiian monk seals has surpassed a level not seen in more than two decades, according to federal officials.

National Oceanic and Atmospheric Administration officials this week said that the seal population has steadily increased over the past two years.

A monk seal resting on a beach in the Northwestern Hawaiian Islands.

Officials estimated the population has grown by more than 100 from 2019 to 2021, bringing the total from 1,435 to 1,570 seals. Monk seals live only in Hawaiʻi, including the uninhabited Northwestern Hawaiian Islands where most of the animals are found.

The Northwestern Hawaiian Islands are all within Papahanaumokuakea Marine National Monument, the largest protected marine area in the United States and a UNESCO World Heritage Site.

Michelle Barbieri, the lead scientist at NOAA's Hawaiian Monk Seal Research Program, said the count shows that conservation efforts have been helping. The group travels across the archipelago to provide treatment and rescue to animals in trouble.

“We are out there ourselves and working with partners to conduct life-saving interventions for seals, prioritizing females, which are going to go on to create the future generation of seals,” Barbieri said. “We're starting to really see that continued payoff of intervening to save animals' lives.”

NOAA has monitored the seal population for almost 40 years. The agency said this is the first time the population has surpassed 1,500 in more than 20 years.

The animals are listed as endangered under the Endangered Species Act and depleted under the Marine Mammal Protection Act.

Officials said that while the trend is promising, concerns remain about survivability as the low-lying islands and atolls the seals live on are threatened by rising sea levels associated with climate change.

mele exploring behind naupaka hawaiian monk seal
Hawaii Marine Animal Response
RM90 exploring on the beach around naupaka plants (Hawaiian native plant).

Some islands in the region are only a couple feet above sea level.

"Climate change is definitely something that we're really worried about," Barbieri said. “We're really seeing those impacts, we're living it now. And it has real ramifications for survival for seals.”

The islets of French Frigate Shoals are home to about 20% of the monk seals in the Northwestern Hawaiian Islands and for a long time hosted the species’ largest subpopulation.

The landmass there has shrunk for decades with some of the islands disappearing entirely.

Whaleskate Island, Trig and East Island have all washed away. Whaleskate and Trig were lost to erosion and East Island was wiped out by Hurricane Walaka in 2018.

Terrestrial habitat loss is just one of the problems facing the population. Seals are often entangled in fishing nets and other marine debris, ingest fishing hooks and some seals are targeted and killed by humans.

Monk seal populations declined for decades before the population began to recover in 2013.

Barbieri said the animals not only play a critical role in the food chain, but they're also an indicator of the overall health of the ocean.

“If we have healthy monk seals,” Barbieri said, “we know that the ecosystem that is supporting those animals is healthy and thriving.”

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