Maggie Prevenas

April 14, 2007April 1, 2021

Maggie Prevenas, April 14, 2007

NOAA Teacher at Sea
Maggie Prevenas
Onboard US Coast Guard Ship Healy
April 20 – May 15, 2007

Mission: Bering Sea Ecosystem Survey
Geographic Region: Alaska
Date: April 14, 2007

Species Profiles

Spotted Seal

Studying the spotted seals

Today was our first close encounter with a spotted seal. Spotted seals are the most common ice seals in this area. They are known for their spicy personality.

Where do spotted seals live?

Spotted seals live along the continental shelf of the Beaufort, Chukchi, Bering, and Okhotsk Seas, south to the northern Yellow Sea and west to the Sea of Japan.

How many spotted seals are there?

There is no accurate population count at this time, but it is estimated that there are under 300,000. They are the most common ice seal up in the Bering Sea.

How can I identify a spotted seal?

Pups are white and weigh 18 to 26 pounds. This one was a bit heavier.

Spotted seals are wary and hard to get close to. Adult spotted seals are silvery-gray with dark grey on the back and covered with brown to black irregular spots. Pups are born with a white coat but molt to the adult colors after 3 or 4 months. It is believed they winter in the Bering sea. Following the ice front, they travel north in the spring and summer. They reverse the process and follow the developing ice south in the fall. Spotted seals may get to be 270 pounds, but males and females average 180 to 240 pounds. Length of grown seals is between 4.5 and 5.5 feet. Newborn pups weigh 18 to 26 pounds (8 to 12 kg) and average about 33 inches (84 cm) long.

What do spotted seals eat?

Spotted seals eat many things, depending on the season and their location, including Arctic cod, sand lance, sculpins, flatfishes, cephalopods, and a variety of shrimps.

During the first few weeks after weaning, pups seem to spend most of their time on the ice, but they do not enter the water.

How do spotted seals have their young?

Spotted sea pups are born anytime from early February to the first part of May, depending on their location. Pups are white and weigh 18 to 26 pounds. They are nursed for three to six weeks, during which time they more than double in weight. During the first few weeks after weaning, pups seem to spend most of their time on the ice, but they do not enter the water. Spotted seal pups take longer than other ice seals to learn to swim and dive! In the spring, spotted seals will form small groups of a male, female and her pup.

How long do spotted seals live? How do they die?

The life span of spotted seals is believed to be up to 35 years.

The predators of the spotted seal include the polar bear, sharks, Steller sea lions, brown bears, humans and walrus. Wolves, foxes and large birds have been known to feed on pups.

Did You Know? Spotted seal are the only seal that breeds in China!

April 13, 2007April 1, 2021

Maggie Prevenas, April 13, 2007

NOAA Teacher at Sea
Maggie Prevenas
Onboard US Coast Guard Ship Healy
April 20 – May 15, 2007

The three person crew from left, Shawn Dahle, Josh London, and Mike Cameron.

Mission: Bering Sea Ecosystem Survey
Geographic Region: Alaska
Date: April 13, 2007

Science Log: Launching the Helicopter and Zodiacs

One thing you can say about the BEST mission is that it’s full of adventure! Take today for example.

April 13 was the launch test date for the helicopter that the National Marine Mammal Lab (NOAA) uses for transects of seal populations. There was an air of excitement about the boat. The helicopter, pilot, and three-person crew were going to test out the machine and the instruments they needed. And they did.

This beautiful machine will carry up to three seal scientists to study ice seal populations.

The helicopter was a thing of beauty. It carries 600 pounds of cargo including human passengers. It is equipped with a camera that can take a picture of what is directly below the machine every two seconds. Seals missed in a count can be seen in the photos. It lifted straight up from the flight deck. No glitches. So fast. It circled over us and was gone. Zoom, zoom, and zoom.

After more than an hour, the helicopter returned to the ship. It approached from the starboard (right side) of the flight deck, slowly, slowly, and then landed as soft as a snowflake on the rough textured cement.

They waited for the blades to stop, then jumped out of the helicopter from doors in the passenger and navigator positions. They were covered from head to foot in safety gear, bundled against a potential problem. No problems surfaced.

They saw the ice boundary just 14 miles away. They saw a seal.

Being a scientist requires you to have top-level problem solving and analyzing skills. The scientific team from the National Marine Mammal Laboratory (NMML) is a great example of this skill in practice.

Michael Cameron led a team of six skilled seal experts through a practice run of a seal launch. It may sound easy, but the Healy had never launched a zodiac of the 17-foot or 14 foot variety before. A joint dry run was held to test the abilities of the Seal Team to change into survival gear and the abilities of the Coast Guard to get the zodiacs into the water. Right after breakfast, the teams made a beeline to the heliport, where the three zodiacs patiently rested. While the Coast Guard gathered together and assigned duties to the staff, the Seal Team pulled and tugged on their safety gear.

Next, the entire team got together and the Coast Guard brought up potential problem areas. The seal team regrouped for a few reminders. And the dry run began. The Coast Guard scrambled into position, using ropes, cables, and a ‘headache ball’ (a modified hook attached to a pulley). Soon the ball and hook were attached to the zodiacs’ rope harness.

The headache ball is a modified hook and pulley that is used to haul heavy objects.

A crane operator plucked the first zodiac away from its trailer cradle and gently, so gently lowered it to the icy 31-degree water.

The first two scientists, Mike Cameron the seal catcher and David Withrow the skilled driver, descended the Jacob’s Ladder. I have always known Jacob’s Ladders to be toys that you can flip over and over again by twisting your wrist. That was not this. This was not a toy. This is science!

Strong hands held the three zodiacs together.

The scientists had to descend to the zodiac along a suspended ladder. The ladder was a twisty moving thing. They were wearing bunny boots the size of watermelons on their feet. It must have been hard hanging and balancing. But they made it. Yay, they made it! But, you can count on something going wrong on a dry run. And it did.

The first zodiac had a very nice outboard motor, that wouldn’t start. David and Mike took turns pulling. And pulling. And pulling. And pulling.

David told me later in the day, that even though the motor was a bit temperamental, it was still better than some of the motors he had to work with in the past. It was David who finally started the motor. By the set of his jaw, and the strength of the pull, I could tell that pull was the one. And it was.

Off they went waiting for the other two zodiacs. Each launch of the zodiac proved faster and smoother than the previous. Soon the flotilla circled and took off flying across the water. Two short miles later, the zodiacs slid into position on the starboard side of the Healy. They reversed the process of boarding into the process of deboarding. First they stopped the motor. Then they connected the ‘headache ball’ to the rope harness.

One at a time, the driver and seal catcher climbed the ladder. After they were safe on the Healy, the skilled Coast Guard crane operator and rope tethers eased the zodiac back into her trailer cradle. Each time they pulled in a zodiac, it was smoother. At the end of the exercise, I don’t know which group had the wider smile, the six seal scientists or the Coast Guard Zodiac Crew.

April 12, 2007April 1, 2021

Maggie Prevenas, April 12, 2007

NOAA Teacher at Sea
Maggie Prevenas
Onboard US Coast Guard Ship Healy
April 20 – May 15, 2007

Mission: Bering Sea Ecosystem Survey
Geographic Region: Alaska
Date: April 12, 2007

Ship Crew

Ray Sambrotto is the PI (principal investigator) for this expedition. His job, besides doing investigations in the lab, is to coordinate the entire BEST mission. He has to meet daily with the Coast Guard Officers, check accountability and coordinate sampling, but there is a lot more. He is constantly on watch to fix potential problems that might arise. And they do arise.

Dr. Sambrotto works with two scientists, Drs. Cal Mordy and Nancy Kachel to coordinate sampling.

So we needed a point of contact, to run communication and requests between the very busy scientists and us. David Hyrenbach, from the University of Washington, is acting as our liason with the scientists on the BEST cruise. There are so many scientists and so many projects, we needed organization to help us learn who is who doing what and when and maybe why.

David Hyrenbach is our education liason.

He steered us in the direction of creating a table of rotation visits to the various scientific teams on board. We used the theme of ‘Energy and Matter Transfer Through the Ecosystem.’ We divided all the teams into where they fit in the ecosystem.

Easy enough?

But in reality, it doesn’t work that way. Some scientists might have equipment malfunction. Some might have sample contamination or lack of a sample. There are many ways things can go wrong. And they do. When that happens, they go to a holding pattern and regroup. All scientists suffer setbacks. It matters not that you have had extensive meetings, done problem solving, and communicated with everyone that needs to know. This is science. And anything that might happen will happen.

In science, you need to have a backup plan, and then another backup plan. If something happens to Plan A, continue the experiment with Plan B. If Plan B goes down, take up Plan C.

Dr. Cal Mordy was my first rotation scientist. He is testing the water for certain nutrients. The data he gets is important for many of the scientists on this mission. — Dr. Cal Mordy was my first rotation scientist. He is testing the water for certain nutrients.

Making observations from the bridge is an enjoyable task.

After all, this is science.

April 10, 2007April 1, 2021

Maggie Prevenas, April 10, 2007

NOAA Teacher at Sea
Maggie Prevenas
Onboard US Coast Guard Ship Healy
April 20 – May 15, 2007

Mission: Bering Sea Ecosystem Survey
Geographic Region: Alaska
Date: April 10, 2007

Albatross often mate for life. Photo by Maura Naughton

Species Profile: Laysan albatross: Diomedea immutabilis

One bird that we expect to find up here in the western part of the Bering Sea is the Laysan Albatross. This is one beautiful bird, large creamy white, and so elegant! It breeds in the Hawaiian Islands, mostly in the isolated Northwestern Hawaiian Islands (NWHI). My students have a great connection to the Bering Sea with this animal as it flies from those small Hawaiian islands all the way up here to find food. They will have the chance to study its diet when they dissect boluses from the chicks bred on Tern Island in the French Frigate Shoals of the NWHI archipelago later on this quarter.

Where can you find the Laysan Albatross?

The Laysan Albatross breeds on isolated islands in the central Pacific Ocean, but is found throughout the northern oceans during all times of the year. They are most commonly seen in the Bering Sea and Aleutian Islands flying low over the waves searching for food.

How large are they?

Laysan Albatrosses are among the largest of all flying birds, having a wingspread greater than 2m (6 ft), but weighing only 10 kg (22 lbs).

What do they eat?

Laysan Albatrosses are specialized feeders on schooling fish and snatch unwary victims from just under the surface. They also eat squid, flying fish eggs, and most unfortunately, lots of plastic marine debris.

What’s pelagic mean?

Birds and other animals that spend most of their lives at sea, and use land only to breed are called pelagic. Once hatched, albatrosses will return to land only to breed, the rest of their life is spent at sea.

How do they sleep?

They sometimes are seen asleep on the water but this makes them easy targets for killer whales and hunters. Most albatrosses apparently sleep while gliding in the air.

This information was copied and slightly modified from this website:

http://www.mnh.si.edu/arctic/html/albatross.html

Please visit the website and credit them correctly if you use this information.

April 9, 2007April 1, 2021

Maggie Prevenas, April 9, 2007

NOAA Teacher at Sea
Maggie Prevenas
Onboard US Coast Guard Ship Healy
April 20 – May 15, 2007

Mission: Bering Sea Ecosystem Survey
Geographic Region: Alaska
Date: April 9, 2007

Personal Log

Yesterday I boarded the ship!

It’s a big ship. And I’m learning.

I learned that many hands make light work. Ned Cokelet, one of the NOAA oceanographers, volunteered to haul us to the boat. The gear of six scientists and two teachers is voluminous. It filled up the pick-up box of a good-sized truck. We topped it off with two scientists who couldn’t fit into the inside of the cab and off we bumped. We bounced pass the airport and didn’t have to wait for airplanes crossing the road (the only stoplight in Dutch). The ride was short and we didn’t get lost.

Unloading the gear was light work. Eight people grabbing bags and shuffling up the gangplank drained the back of the pickup in short time. We learned the names of a few of the crew, essential to the upload process and began the transfer of our gear to our sleeping quarters or berths. Although the stairways were steep, to conserve space on ship, they were easy enough to navigate. Bag by bag I filled the space that would be mine for the next 33 days.

I can do this.

Much of the afternoon and evening centered in the science lab area. I sensed urgency in the scientists securing their equipment and setting up their lab gear. They used bungee cords, duct tape, rope and these little screw wires with eyehooks to secure their areas. We learned that the boat can pitch and sway in the spring seas. Anything unsecured soon becomes a flying projectile. Safety is the top priority. Unsecured gear can hurt you and others. Tie it down, tape it up, or put it away.

We watched and tried to volunteer for jobs that would make their lives easier. After a while we realized that we were taking up space and busied ourselves with our assignment, observing, taking mental notes, and writing about the expedition. We familiarized ourselves with the ships internal computer system and science public log-ins.

We posted and massaged our journals. Soon it was bedtime, but the ships scientists worked on into the night.

The scientists on board are playing in rhythm to their own music. It is a musical symphony! Sometimes one section of the orchestra will break away and so a solo, but for the most part, they play together, in melodies that support and enhance the whole. That’s what this expedition is all about. Doing research to supports the understanding of the whole ecosystem. One instrument cannot play the entire symphony. One scientist cannot do it all. It’s going to take many hands working together, insightful minds interpreting data, all listening to each other.

We can do this.

And after we learn how, I’m going to teach you. And you can tell others and show them how. So what exactly are we are trying to learn?

One ocean, one earth, one people.