Alaska
Beluga whales’ calls may get drowned out by shipping noise in Alaska’s Cook Inlet – Alaska Native News
Beluga whales are highly social and vocal marine mammals. They use acoustics to navigate, find prey, avoid predators and maintain group cohesion. For Alaska’s critically endangered Cook Inlet beluga population, these crucial communications may compete with a cacophony of noise from human activities.
New research from the University of Washington, the National Oceanic and Atmospheric Administration’s Alaska Fisheries Science Center and the Alaska Department of Fish and Game is the first to document the complex vocal repertoire of the Cook Inlet beluga whale population. It is also the first to quantify how ship noise may be masking specific beluga calls in this region.
The study, published Nov. 30 in the Journal of the Acoustical Society of America, finds 41 distinct types of calls, of which 18 are unique to this population. It also finds that commercial ship noise completely masks these whales’ most commonly used calls.
“The core critical habitat for these whales is a very noisy area. Commercial shipping, an international airport, military operations and gas and oil exploration are all concentrated there,” said lead author Arial Brewer, a doctoral student in the School of Aquatic and Fishery Sciences at the UW who did the work in collaboration with NOAA Fisheries’ Alaska Fisheries Science Center.
“A fundamental knowledge gap for the Cook Inlet beluga population is how they communicate important information. The first step is to describe their vocal repertoire,” she added. “With that information, we can begin to understand if their communication is impacted by human-caused noise.”
Twenty-one populations of belugas are recognized worldwide, including five distinct populations in Alaska. The geographically and genetically isolated Cook Inlet beluga population is the smallest, recently estimated at just 331 individuals. Cook Inlet beluga whales live exclusively in their namesake waters alongside Anchorage, the state’s largest city and busiest port.
The Cook Inlet beluga whale population was listed as endangered under the Endangered Species Act in 2008. A 2016 recovery plan ranked three threats as the highest level of concern, one being human-caused noise. Commercial shipping is the most prominent noise source within Cook Inlet, particularly in the upper inlet where most of the federally-designated critical habitat is located.
”All of that human-caused noise means the belugas may not hear critical communications from each other, such as predator alarm calls or a mother calling to her calf,” Brewer said.
While all whales are affected by noise, Cook Inlet belugas may be particularly vulnerable to noise as a stressor.
“Cook Inlet is extremely turbid year-round from glacial runoff. It looks like chocolate milk,” Brewer said. “Acoustic communication is extremely important for this population since visibility is so poor. And, unlike other, higher-Arctic beluga populations, this population is non-migratory, so they are exposed to this noise year-round.”
Cook Inlet’s extreme turbidity, dramatic tides, rapid currents and seasonal ice cover make it an extremely challenging place to study belugas. One way scientists can monitor these highly vocal whales is through sound.
The Cook Inlet Beluga Acoustics Program has been deploying bottom-mounted passive acoustic recorders to monitor belugas and human-caused noise since 2008. The study focused on recordings of beluga whale calls from 2018 to 2019.
“Until now, we did not have a quantified measure of masking by ship noise on Cook Inlet beluga communication. We knew this was a potential disturbance mechanism to focus our research efforts, but we were lacking a good understanding of what vocalizations are most important for beluga,” said co-author Manuel Castellote, a research scientist at the UW-based Cooperative Institute for Climate, Ocean and Ecosystem Studies who manages the acoustics monitoring program. “This study provides the first two steps into this direction: We now have a solid understanding of key vocalizations for this population, and how each ship transit is affecting beluga vocal exchange in the core area of their critical habitat.”
For the new study, scientists analyzed recordings at two critical habitat locations: Susitna River, just outside of Anchorage, and Trading Bay, farther out in the inlet.
They classified beluga vocalizations into three broad categories — whistles, pulsed calls and combined calls — and then further into 41 unique call types.
“I’ve spent thousands of hours listening to this population. Anytime I find a new call type, it’s really exciting,” Brewer said, “Eavesdropping on their world is really fascinating.”
The study found that the Cook Inlet beluga population, like other beluga populations, has a rich and complex repertoire. Vocal repertoire has been documented for eight of the 21 populations of belugas worldwide. Results from this study support the hypothesis that some call types are shared across populations, while others are unique.
Of the 41 types of calls the authors documented in the Cook Inlet population, 18 were not documented in any other population; 16 were documented in some but not all of the previously studied populations; and seven were common to all populations studied so far.
“Differences in vocal repertoire among different beluga populations may be driven by unique evolutionary, environmental or cultural influences,” Brewer said. “The divergence of the Cook Inlet vocal repertoire may be in part due to the population’s long-term geographic and genetic isolation.”
The researchers next looked at how the most commonly-used call types may be masked by human-caused noise. They focused on commercial ship noise, which is the most prominent noise type in Cook Inlet.
Analysis found that all seven of the most commonly-used call types in the Cook Inlet beluga vocal repertoire were partially masked by the time a commercial ship was within about 10 miles (17 kilometers) of the study site. Calls were completely masked when the vessel was closest to the site during the transit through the designated shipping lanes.
Roughly 486 commercial ships use the Port of Alaska annually, with an average of 8-10 ships coming and going per week. It is estimated that each ship passage will mask beluga communication at the study site for 1 hour and 50 minutes on average.
“Our results suggest that every time a commercial vessel transits through the Port of Alaska shipping lanes, Cook Inlet beluga communication could be heavily impacted within their core habitat,” Brewer said.
“Humans are such a visual species. It’s hard for us to comprehend how noisy it is under the surface of the ocean and how much noise impacts marine mammals such as belugas. We hope our findings will lead to further studies to better inform management about these types of human-caused impacts.”
The research was funded by NOAA Fisheries, Hilcorp Alaska LLC, Georgia Aquarium, Shedd Aquarium, the SeaWorld-Busch Gardens Conservation Fund and the H. Mason Keeler Endowed Professorship in Sports Fisheries Management at the UW.
Other co-authors are faculty members Amy van Cise and Andrew Berdahl in the UW School of Aquatic and Fishery Sciences; and Tom Gage at the Alaska Department of Fish and Game.
For more information, contact Brewer at arialb@uw.edu or Castellote at manuelcm@uw.edu.
Adapted from a NOAA feature story.
U of W
Alaska
Alaska Jewish community prepares to celebrate start of Hanukkah
ANCHORAGE, Alaska (KTUU) – Rabbi Josef Greenberg and Esty Greenberg of Alaska Jewish Campus, joined Alaska’s News Source to explain more about Hanukkah and how Anchorage can celebrate.
They will be hosting Chanukah, The Festival of Lights for “Cirque De Hanukkah,” on Sunday, Dec. 29, at 5 p.m., at the Egan Center.
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Copyright 2024 KTUU. All rights reserved.
Alaska
A Christmas & Hannukah mix of winter weather
ANCHORAGE, Alaska (KTUU) – A variety of winter weather will move through Alaska as we go through Christmas Day and the first night of Hannukah.
A high wind warning started Christmas Eve for Ketchikan, Sitka, and surrounding locations for southeast winds 30-40, gusting to 60 miles per hour. Warnings for the combination of strong winds and snow go to the west coast, western Brooks Range, and Bering Strait.
Anchorage is seeing a low-snow Christmas. December usually sees 18 inches of snow throughout the month. December 2024 has only garnered a paltry 1.5 inches. Snow depth in the city is 7 inches, even though we have seen over 28 inches for the season. A rain-snow mix is likely to hit Prince William Sound, mostly in the form of rain.
A cool-down will start in the interior tomorrow, and that colder air will slip southward. By Friday, the southcentral region will see the chances of snow increase as the temperatures decrease.
The hot spot for Alaska on Christmas Eve was Sitka with 48 degrees. The coldest spot was Atqasuk with 23 degrees below zero.
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Copyright 2024 KTUU. All rights reserved.
Alaska
Santa catches a ride with troops to bring Christmas to Alaska village
YAKUTAT, Alaska — Forget the open-air sleigh overloaded with gifts and powered by flying reindeer.
Santa and Mrs. Claus this week took supersized rides to southeast Alaska in a C-17 military cargo plane and a camouflaged Humvee, as they delivered toys to the Tlingit village of Yakutat, northwest of Juneau.
The visit was part of this year’s Operation Santa Claus, an outreach program of the Alaska National Guard to largely Indigenous communities in the nation’s largest state. Each year, the Guard picks a village that has suffered recent hardship — in Yakutat’s case, a massive snowfall that threatened to buckle buildings in 2022.
“This is one of the funnest things we get to do, and this is a proud moment for the National Guard,” Maj. Gen. Torrence Saxe, adjutant general of the Alaska National Guard, said Wednesday.
Saxe wore a Guard uniform and a Santa hat that stretched his unit’s dress regulations.
The Humvee caused a stir when it entered the school parking lot, and a buzz of “It’s Santa! It’s Santa!” pierced the cold air as dozens of elementary school children gathered outside.
In the school, Mrs. Claus read a Christmas story about the reindeer Dasher. The couple in red then sat for photos with nearly all of the 75 or so students and handed out new backpacks filled with gifts, books, snacks and school supplies donated by the Salvation Army. The school provided lunch, and a local restaurant provided the ice cream and toppings for a sundae bar.
Student Thomas Henry, 10, said while the contents of the backpack were “pretty good,” his favorite item was a plastic dinosaur.
Another, 9-year-old Mackenzie Ross, held her new plush seal toy as she walked around the school gym.
“I think it’s special that I have this opportunity to be here today because I’ve never experienced this before,” she said.
Yakutat, a Tlingit village of about 600 residents, is in the lowlands of the Gulf of Alaska, at the top of Alaska’s panhandle. Nearby is the Hubbard Glacier, a frequent stop for cruise ships.
Some of the National Guard members who visited Yakutat on Wednesday were also there in January 2022, when storms dumped about 6 feet of snow in a matter of days, damaging buildings.
Operation Santa started in 1956 when flooding severely curtailed subsistence hunting for residents of St. Mary’s, in western Alaska. Having to spend their money on food, they had little left for Christmas presents, so the military stepped in.
This year, visits were planned to two other communities hit by flooding. Santa’s visit to Circle, in northeastern Alaska, went off without a hitch. Severe weather prevented a visit to Crooked Creek, in the southwestern part of the state, but Christmas was saved when the gifts were delivered there Nov. 16.
“We tend to visit rural communities where it is very isolated,” said Jenni Ragland, service extension director with the Salvation Army Alaska Division. “A lot of kids haven’t traveled to big cities where we typically have Santa and big stores with Christmas gifts and Christmas trees, so we kind of bring the Christmas program on the road.”
After the C-17 Globemaster III landed in Yakutat, it quickly returned to Joint Base Elmendorf-Richardson in Anchorage, an hour away, because there was nowhere to park it at the village’s tiny airport. Later, it returned to pick up the Christmas crew.
Santa and Mrs. Claus, along with their tuckered elves, were seen nodding off on the flight back.
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