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Fledgling seabirds in Hawaii are easy prey for tiger sharks

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Fledgling seabirds in Hawaii are easy prey for tiger sharks


A tiger shark lunges out of the water to grab a young albatross. A new study has revealed that fledgling seabirds attract tiger sharks during the summer at Hawaii’s French Frigate Shoals. Image via Joe Spring/ NOAA/ University of Hawaii Manoa.

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  • Tiger sharks gather around Hawaii’s French Frigate Shoals in summer to prey on newly fledged seabirds, a new study has revealed.
  • The influx of tiger sharks pushes smaller shark species to change where and how they hunt.
  • Seasonal seabird movements strongly influence the balance of the entire local shark ecosystem.

When seabirds fledge, northwestern Hawaii shark ecosystems are disrupted

There are several shark species that patrol the waters of the French Frigate Shoals atoll in northwestern Hawaii. In December 2025, scientists reported that the population of tiger sharks surges during the summer in some areas of the atoll. That’s because those sharks are opportunistically preying on newly fledged seabirds, primarily albatross chicks. Moreover, that high seasonal influx of tiger sharks forces smaller sharks in those waters to change the way they use their habitat.

Chloé Blandino, at the Hawaii Institute of Marine Biology Shark Lab, is the lead author of the paper on this study. She said in a statement:

We discovered that tiger sharks gather around small islands in summer to hunt fledgling seabirds, which, in turn, forces other smaller sharks to adjust their habitat use. It’s a clear example of how a seasonal food source can influence habitat use by an entire predator community.

The researchers published their findings in the peer-reviewed journal Ecosphere on December 2, 2025.

Tiger sharks go after young seabirds

The French Frigate Shoals in northwestern Hawaii is a crescent-shaped barrier reef with small sandy islands. These tiny islands provide critical habitat for seabirds, green sea turtles, and Hawaiian monk seals. The seabirds include species like albatrosses, tropicbirds and terns.

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Blue ocean with a crescent-shaped atoll and some clouds.
This image of the French Frigate Shoals in the northwestern Hawaiian Islands was captured by an astronaut in 2003. It shows the crescent shaped reef hugging a lagoon with small sandy islands. Image via NASA.

During the summer, tiger sharks converge in the atoll waters to prey on fledgling seabirds. These young birds, which hatched just months earlier, are just learning to fly. As a result, they have not yet become adept at avoiding predators.

Tracking shark behavior

The researchers targeted three species known to frequent the atoll waters: tiger sharks (Galeocerdo cuvier), Galapagos sharks (Carcharhinus galapagensis), and gray reef sharks (Carcharhinus amblyrhynchos).

They surgically inserted acoustic transmitters in the sharks, each one emitting a unique coded signal. Their work followed careful animal handling protocols that University of Hawaii researchers developed to minimize harm to the sharks.

In addition, the researchers installed underwater receivers to pick up sounds from each shark’s transmitter. These receivers were placed in habitats occupied by the sharks: near coral reefs, as well as in deep and shallow lagoon areas. As a result, when a shark swam near a receiver, the signal from its transmitter was picked up, recording a timestamped location for the animal. This allowed the scientists to track each shark’s movement.

Blue ocean with a crescent-shaped atoll. It is marked with blue, yellow, and red dots within circles and oblongs of dotted lines.
Another image of the French Frigate Shoals, marked with the locations of acoustic receivers. Yellow dots indicate the locations of receivers in the shallow lagoon area and near small sandy islands. Blue dots are for receivers at the deep parts of the lagoon. And red dots are receivers near the coral reef. The dotted boundaries are data analysis regions used by the scientists. Image via Blandino, C. A., et al./ Ecosphere (CC BY 4.0)

Extra influx of tiger sharks affects other sharks

For two years, the scientists tracked 128 sharks at the French Frigate Shoals. Their data revealed interesting information about the sharks’ movements.

They found that tiger sharks are more abundant in the shallow lagoon of the atoll in summer, around the time that albatross chicks are fledging. They were taking advantage of easy prey since the chicks were not yet adept fliers.

Moreover, the summer influx of tiger sharks also affected the dynamics of the atoll’s shark community. Grey reef sharks, which are smaller than tiger sharks, moved out of the lagoon areas occupied by tiger sharks. They retreated to waters near the reef to primarily hunt fish. Meanwhile, Galapagos sharks changed the timing of their hunts in some places. They also preyed on monk seal pups, avoiding albatross chicks.

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Towards the end of summer, surviving fledgling seabirds, along with their parents, dispersed farther out to sea. With no more easy prey to take down, most tiger sharks moved out of the shallow lagoon, and the other sharks returned to their usual ecological niches.

Seabirds have a big impact on shark population

Carl Meyer, also at the Hawaii Institute of Marine Biology Shark Lab, is a paper co-author. He and his colleagues noted that if the birds lost their habitat to adverse weather, it would have a significant effect on the shark community, the Hawaiian monk seals, and of course, the seabirds themselves.

Two seals on a beach looking at two sharks in shallow water.
Two Hawaiian monk seal pups watching two Galapagos sharks swimming in shallow water at Trig Island in the French Frigate Shoals. Image via Carl Meyer/ University of Hawaii Manoa.

Meyer commented:

This study highlights the far-reaching impact of seabirds, showing they can shape the movements of top predators like tiger sharks, which then ripple through the entire food web. Understanding these predator-prey links is crucial for managing Hawaii’s marine ecosystems.

Bottom line: When seabirds fledge at the French Frigate Shoals atoll of northwestern Hawaii, tiger sharks move in to prey on the fledgling seabirds, disrupting shark populations in the area.

Source: Seabirds mediate intraguild and competitive interactions in a shark community

Via University of Hawaii Manoa

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Read more: Teenage Greenland sharks’ hangout spot revealed in new study

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Paid parking lots debate continues – Hawaii Tribune-Herald

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Paid parking lots debate continues – Hawaii Tribune-Herald






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PHOTOS: 4 ways locals celebrated July 4 this year

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PHOTOS: 4 ways locals celebrated July 4 this year


HONOLULU (KHON2) — Various celebrations — beyond the usual fireworks and barbecues — marked the U.S.’s 250th anniversary on Independence Day.

From regatta to an annual Japanese tradition on Oʻahu, here’s four other events that took place on this July 4.

84th Regatta

To start off the morning, the 84th Walter J. Macfarlane Memorial Canoe Regatta was held at Waikiki Beach.

“Today there’s a swell. It’s not huge, but it’s not flat, so I mean it’s like a perfect requirement day, there’s excitement, there’s enough activity to keep it, first the variable, and keep everybody on their toes, and it makes for close races,” said Jim Foti with the Lanikai Canoe Club.

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Canoe paddlers of all ages hit the water for a full day of racing.

“We have had some really fun races this morning,” said Siana Austin Hunt, president of the Oahu Hawaiian Canoe Racing Association. “Our kids did really well. We also had some great finishes with a lot of crews finishing on the same wave.”

The regatta is a tradition that is recognized as the longest-running outrigger canoe races in the world.

America250

Kapiolani Park served as the backdrop for America’s once-in-a-lifetime celebration commemorating 250 years. The free event brought families together for food, music, performances and special recognition for our military and veterans.

America250 event in Kapiolani Park on July 4, 2026.

“There’s a lot of people that’s been going around the different booths and the different venues and enjoying themselves, listening to the music every hour on the hour, and at the same time they’re looking at some of the auditory, tasting the various different types of food, and just enjoying yourself and relaxing,” said Lynn Mariano, commissioner of Hawaii America250 Commission.

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La Hoʻihoʻi Ea

While many celebrated Independence Day, others gathered at Iolani Palace to reflect on a different perspective of Hawaiʻi’s history into statehood.

The event highlighted La Hoʻihoʻi Ea, or Sovereignty Restoration Day, which commemorates the history of the Hawaiian Kingdom and encouraged a discussion about Hawaiian sovereignty and self-determination.

“We’re here to reclaim our place to retell our stories and to resound the message of Hawaiian sovereignty restoration,” said Imai Winchester, lead organizer for La Hoʻihoʻi Ea.

The free event included cultural performances, music, educational exhibits, speakers and family activities. It was the first of a month-long series of events that will lead up to a celebration on July 26 at Thomas Square.

Organizers said it’s an opportunity to learn, reflect and celebrate Hawaiian identity.

Mōʻiliʻili Summer Fest

An annual Japanese tradition fell on the 4th of July this year. The popular Mōʻiliʻili Summer Fest drew in thousands to the Old Varsity Theater parking lot on University Avenue.

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Now in its 13th year, the event prides itself on having one of Honolulu’s largest bon dances — and no obon festival is complete without taiko drums and andagi.

One of the booths was prepared to sell thousands of the deep-fried treat, with proceeds supporting Hawaii’s young athletes.

The festival is held every first Saturday of July.



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First Alert Forecast: Classic Hawaii trade wind weather

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First Alert Forecast: Classic Hawaii trade wind weather


HONOLULU (HawaiiNewsNow) – Partly to Mostly Sunny skies with windward and mauka showers drifting leeward at times. Most of the rainfall will be light and in the overnight to early morning hours with an increasing trend on Tuesday and stronger trends on Thursday and Friday; which is good because we need to beneficial rainfall.

View the latest weather conditions here.

Trade winds will continue blowing from the east all week while a high-pressure system sits north of Hawaii, keeping conditions mostly stable. On Tuesday, a weak weather system moving in from the east will bring some extra showers across the islands, but nothing major. A more significant system arrives Thursday through Friday—it’s actually the leftover remains of a tropical cyclone—and will bring noticeably heavier rain, especially on the windward sides of the islands (the sides facing the trade winds) and on mountain slopes, with humidity increasing as well. The highest rainfall will happen Thursday through Friday, though overall rainfall amounts will stay limited due to large-scale stability in the atmosphere.

A Small Craft Advisory now in effect for all Hawaiian waters (a warning for smaller boats to be cautious). A new long-period swell from the south-southwest is already moving in and will boost south shore surf heights to near-High Surf Advisory levels through Monday before gradually fading. East-facing shores will remain rough and choppy throughout the week from the strong winds, while north-facing shores will stay relatively flat. These windy conditions and Small Craft Advisories will continue through the entire week.

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Download the HNN Weather app from the Apple App Store or Google Play for the latest updates from your First Alert Weather Team: chief meteorologist Jennifer Robbins, meteorologist Drew Davis, and weather anchors Guy Hagi, Ben Gutierrez, and Billy V.

Download HNN’s weather app for everything you need to plan your day.(Hawaii News Now)

Copyright 2026 Hawaii News Now. All rights reserved.



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