Another one bites the dust!

A mere 26 days after re deploying Metis with a new cable and hydrophone, and hearing fantastic whale song, the hydrophone once again was preyed upon! Is is really hard to tell if it is a shark or a barracuda, non-the-less, we are not sure why this is happening. The sea surface temperature has been about the same (78.8°F). We have had a Wave Glider equipped the same way, in these same waters every winter season for years, and never experienced this. This time we have a little audio to go with it. While there is no Jaws music in the background, it does sound like a freight train hit the hydrophone.

P.S. Europa is still happily cruising along and about 400 NM away from Isla Clarión, Mexico. More on this in our next blog.

Hydrophone cable with several rake marks.

Take a look and listen at the audio and spectrogram below of the exact time when the hydrophone got bitten off!

Clear Humpback Whale Song followed by either a shark or a barracuda biting off the hydrophone

The Sound of Silence

Each year, we have made significant improvements to the audio quality of our HUMPACS payload.

From the first year HUMPACS EAST in 2018 to HUMPACS WEST in 2019, we dropped the hydrophone mount ~4” to help isolate it from the sub. This dramatically improved the amount of noise we were getting from the rudder and the wing stops and even allowed us to not have to filter out so much of the rudder noise (see our Can You Hear Me Now blog).

For HUMPACS PMNM 2020, we again made more improvements, this time to the sub itself, by adding washers and high-density rubber pads to strategic locations (see our Europa Arrives in the PMNM blog).

For HUMPACS MEXICO 2021, we again mitigated more of the self-noise sub sounds which has significantly improved our audio quality.

Here is an example spectrogram of what the whales sounded like from the improved system as Europa left Puako for HUMPACS MEXICO. We are thrilled with the quality!

Hawaiian Archipelago

Aloha everyone,

As 2020 comes to an end, we wanted to present the preliminary report by Dr. Marc Lammers of our Wave Glider Mission through the PMNM.

Have a safe and joyous holiday!

“November 6, 2020

Dr. Marc Lammers, Research Coordinator at NOAA's Hawaiian Islands Humpback Whale National Marine Sanctuary

This presentation describes recent fluctuations in the presence of humpback whales in Hawaiʻi over the past several years and the science being conducted to understand these trends. Dr. Marc Lammers discusses the application of novel tools to understand the occurrence of humpback whales in remote habitats, including the use of a Wave Glider and machine learning algorithms to detect the presence of whales in the Papahānaumokuākea Marine National Monument.

This presentation is part of the Kauai Ocean Discovery speaker series that is celebrating November, which is Ho`i Koholā (Return of Humpback Whale Month).”

Reference:

https://sanctuaries.noaa.gov/education/teachers/occurrence-humpback-whales-through-acoustics.html

Humpback Chronicles

Aloha everyone!

We thought you might enjoy the most recent episode of Whale Trust’s Humpback Chronicles (episode 30), produced by Flip Nicklin and starring our very own Beth Goodwin.

Beth gives a nice rundown of what a Wave Glider is, how it works, and some history of how we at Jupiter Research Foundation have used it to listen to, and detect, humpback whales.

She also tells the stories of our three HUMPACS missions, and the amazing results that came from each mission.

Then Beth gives insight into what the future might hold for continued missions down the road.

Enjoy!

For Whale Trust and Flip Nicklin’s entire library of Humpback Chronicles, click here.

Also, they welcome any questions that you might have. Send your questions to:

humpbacks@whaletrust.org

Europa's Voyage

Below are two time lapse videos of Europa’s Voyage through The Papahānaumokuākea Marine National Monument. We had two cameras taking pictures from sunrise to sunset approximately every 1.5 to 3 hours.

The first video is from a camera mounted on the back end of the float. At the beginning of the journey you’ll see some ti leaves on the float. This was part of Europa’s blessing before embarking on her voyage through the PMNM. As you can see, Europa experienced some rough seas, beautiful sunrises and sunsets, full moons, and calm days with an occasional booby resting on the warm solar panels.

The second video is from a camera mounted in the float looking down at the sub and umbilical. You’ll note that the sub moves around quite a bit. There were times when the umbilical had slack and the wings were fully rotated up or down, indicating rough seas. Occasionally, fish even gathered around the sub.

Please enjoy the videos.

Land Ho, Land Ho!

Europa has finally made it home and was safely recovered March 14th. This type of survey throughout the pristine Papahānaumokuākea Marine National Monument has been the first of its kind. We are very proud of the mission and collaboration with the Navy and NOAA Sanctuary. Thank you all for following Europa’s journey.

Europa’s course navigating outside of the 200’ depth contour (red circles) throughout the PMNM

Europa lays eyes on the Kohala Coast and Mauna Kea on the Big Island

Europa with view of Mauna Kea: Land Ho!

View of Europa from the May Maru

Europa, moments before recovery on the May Maru

Given the current Covid-19 pandemic, Europa follows appropriate bio-security protocol

She's not sure about coming to shore after her journey in the pristine, uninhabited, PMNM. Please stay safe!

Recovery crew: Beth, Maya, and Jessica (from left to right)

Homeward Bound

Europa is on her way home after successfully surveying The Papahānaumokuākea National Marine Monument. As she exited the monument, she concluded with a cross through, and circle around, Middle Bank.

We expect to recover her in Puako sometime in the next 5-7 days, but the journey is not over yet. For this last leg, Europa has been faced with strong winds and high seas, as well as had to dodge a number of cargo and passenger vessels.

Today, a passenger vessel from the Bahamas, headed to Oahu, passed behind her. The vessel’s name was Europa, a good omen we hope!

The entire team from Jupiter, NOAA and the Navy anxiously await her recovery.

Stay tuned!

Europa passing through, and then circling, Middle Bank at the end of her PMNM journey.

A look at all of the marine traffic that Europa is avoiding on her way back home to Puako. Each of those yellow and red dots represent a cluster of vessel breadcrumbs.

Europa vessel that passed by our wave glider Europa earlier today.

Sunrise from Europa in some heavy seas.

Moonrise (supermoon) from Europa with waves crashing.

Half Way Mark - Lisianski and Neva Shoals

We are happy to report that we have continued to hear humpback whales and other species as we passed the North Hampton Seamounts and Neva Shoals at the very north end of our voyage. Of note, the Sea Surface Temperatures (SST) continued to drop. Last night we rounded the north end of Lisianski Island and are now officially headed back down the other side of the chain making our way back home. Below are some pictures from Europa, as well as a couple of audio files from her voyage to the north end of the chain.

A booby catching a ride on Europa

A beautiful sunset seen from Europa

Located 208 kilometers (129 miles) northwest from Laysan is the island commonly known as Lisianski. Another name for Lisianski is Papa‘āpoho. It is a combination of two words. Papa means a reef, flat surface, or foundation and ‘āpoho means depression, hollow, or pitted. Combined, they describe the depression between two tall sand dunes which may have once been the location of a lake similar to the one on Laysan.

About 20 million years ago, geologic forces raised the tip of a huge coral bank above sea level. Today, Lisianski Island is 1.5 square kilometers (381 acres), about the size of Honolulu. While its land mass is relatively small, Lisianski’s coral reef, known as Neva Shoals, is massive at 310,000 acres or 1,254.5 square kilometers, an area nearly the size of O‘ahu.

The first western explorer to reach the island was the Russian Captain Yuri Feodorovich Lisyansky in 1805. The captain ran aground in his ship, the Neva, after which the shoal to the south was named. Various ships visited Lisianski throughout the 1800s to harvest fish, turtles, guano, beche-de-mer (sea cucumbers), sharks, and seals. During this period rats and mice arrived on Lisianski in the 1800s as accidental introductions, and rabbits were purposely introduced by humans as a food source. These mammals consumed most of the vegetation and negatively impacted the terrestrial ecology. Captain John Paty claimed the island for the Kingdom of Hawai‘i on behalf of Kamehameha IV on May 10, 1857. In 1890, the North Pacific Phosphate and Fertilizer Company acquired a twenty-year lease to mine the island for guano. From 1904 to 1909 Japanese feather poachers harvested birds from the island. This activity was stopped after Lisianski became part of the Hawaiian Islands Bird Reservation in 1909.

Today, Hawaiian monk seals and green sea turtles are common visitors to Lisianski's sandy white beaches. Migratory shorebirds seen on the island include the kolea (golden plover), ulili (wandering tattler), and kioea (bristle-thighed curlew). Nearly three-fourths of the Bonin petrels nesting in Hawai’i make this island their home. In some years, more than a million sooty terns visit Lisianski.

Photo by: Greg McFall/NOAA Office of National Marine Sanctuaries, 2011

Coral and giant trevally / ulua aukea (Caranx ignobilis) at Lisianski Island in Papahānaumokuākea Marine National Monument.

Reef fishes of the nearshore waters are abundant and diverse. Researchers have found predators near Lisianski's reefs, such as sharks, to be very aggressive. Even ulua (Trevally jacks) will harass divers and small boats. The reefs of Lisianski and surrounding Neva Shoals are called "coral gardens" by some scientists because of their abundance of coral and the variety of growth forms assumed by their colonies, including structures resembling spires, castles, and a variety of other shapes.

Aloha Raita Bank and Maro Reef

Europa has endured some strong winds and high seas the last few days as a cold front has moved from west to east across the chain. The sea surface temperature has also dropped a bit as we keep heading NW. We were a bit nervous as Europa tracked close to Maro Reef in search of humpbacks. Previous research has indicated that humpback whales frequent the waters surrounding Maro Reef. Humpbacks at Raita Bank have not been previously reported, possibly due to limited survey effort. Europa’s survey has confirmed an abundance of singing humpbacks as well as other odontocetes around Maro Reef and we are happy to report that Europa heard a fair number of humpbacks off Raita Bank as well. Again, this shows the enormous potential autonomous vehicles could have for studying whales in remote areas.

Picture of Europa’s course over the last two days. The red lines demark the 200’ depth line. We have defined this as our “exclusion zone” or safety margin. Alarms will be sent to our piloting team should Europa cross the line. As you can see, she is traveling quite close to shallow waters!

There are approximately 30 submerged banks in the Northwestern Hawaiian Islands. Up until recently very little was known about the banks beyond that they were shield volcanoes formed at the hotspot. Some scientists believe that many of the banks act as ‘stepping stones’ for marine organisms to migrate in the region. The bank areas provide extensive habitat for bottomfish and a few are known to provide foraging habitat for endangered Hawaiian monk seals. Large precious corals, such as gold, pink and black are also found in the deep waters of the banks. Unlike shallow reef corals which are able to harness sunlight as an energy source due to photosynthesizing symbiotic dinoflagellates in their tissues, deep-water precious corals live in near-total darkness and are completely dependent upon capturing plankton from the water column with their tentacles.

Raita Bank is just west of Gardner Pinnacles. The crest, or top, of Raita Bank is about 60 feet from the ocean surface. Bottom habitats of relatively shallow banks such as Raita tend to be barren when compared with more sheltered coral reef environments. Recent surveys revealed less than 1% live coral cover in the shallow portions of Raita Bank, with the bottom scoured by wave action and strong currents. Raita is one of the larger banks in the NWHI, and there is much yet to be discovered about this area.

Maro Reef spans 50 kilometers in length and 30 kilometers in width. Maro Reef is almost completely submerged with very few areas above sea level. The Hawaiian name for Maro Reef is Nalukākala. This name, translated as wave (nalu) and surf comber; to form combers; to blow in gusts (kākala), references the rough seas encountered here.

Maro Reef was named for the Nantucket whaling ship Maro which was the first American whaler to cross the mid-Pacific. This atoll is a hazard for navigators because the lack of visible landmarks makes it difficult to avoid grounding a ship on shallow areas of the reef. On October 8, 1957, the oil tanker USNS Mission San Miguel ran aground while running at full speed and sank here.

Photo by: Greg McFall/NOAA Office of National Marine Sanctuaries

A banded spiny lobster / ula (Panulirus marginatus) and a black spiny urchin / wana (Echinothrix diadema) at Maro Reef in Papahānaumokuākea Marine National Monument.

Maro, or Nalukākala, has the largest extent of coral reef habitat in Papahānaumokuākea and is one of the most ecologically rich locales in the Northwestern Hawaiian Islands. The shallow waters consist of patch reefs and elongate structures called spur and groove formations. The reefs support numerous butterflyfish and surgeonfish species. Grey reef sharks, galapagos sharks, whitetip reef sharks, trevally, jacks, and other apex predators are also numerous. Sharks and other apex predators play an important role in maintaining balance within marine ecosystems by regulating the populations of other species lower in the food chain. In the Hawaiian culture, manō are honored as akua (gods) and ‘aumakua (family guardians).

Feelin' Groovy

Europa has completed about one-third of her voyage north as she continues to cruise across deep ocean basins between the shallow banks, islands and atolls of PMNM. We monitor her health and download audio files and pictures of the sub daily. So far, we have posted some pretty interesting audio files. Below are some pictures of Europa’s sub showing the umbilical with tension and some slack. We painted one side of the umbilical so that we can tell if it gets any twist. Looking pretty straight now!!

Europa sub (PMNM)

Europa sub (PMNM)

Meanwhile, back in Puako, we were able to capture some pretty cool pictures off our Wave Glider, Metis, which is towing a hydrophone and streaming live whale song off Puako. These are of a bottlenose dolphin swimming around the sub, perhaps just curious or trying to catch one of the many fish that hang out around the vehicle. Something very similar has likely happened to Europa while transecting the environmentally rich waters of PMNM. Our hope is to get lucky enough to capture some images like these off Europa during her voyage.

Metis sub (Puako)

Metis sub (Puako)

Metis sub (Puako)

Metis sub (Puako)

Take a look and listen to the audio we captured at the moment when the bottlenose dolphin is hanging out with Metis.

Spectrogram of audio clip below

Bottlenose dolphin with humpback whales chorusing in the background