An orca swims 150 miles off Nantucket. Image: USCG
An orca swims 150 miles off Nantucket. Image: USCG

New England’s Unexpected Summer Visitors

Pure-white, Arctic-dwelling beluga whales and their black and white cousins the orcas are rarely seen in the Atlantic outside of icy polar waters.  While orcas migrate around the globe and inhabit both Arctic and Antarctic waters, belugas are usually at home only in the frozen north. Massachusetts residents, then, are unlikely to ever see these whales, but this month prospective whale watchers might get lucky. Just a few days ago, both whales were spotted in Massachusetts—quite a distance south from the whales’ usual frigid habitat.

On June 15th, a lone beluga was seen in the mouth of the Taunton River in Fall River, Massachusetts. The sighting was rare for two reasons: first for its distance from the arctic and second because belugas usually travel in pods and are rarely seen alone. This beluga, however, which appeared to be a healthy adult male, cruised around solo in the river for several days, delighting the citizens of Fall River but worrying advocates concerned for the whale’s safety. Meanwhile, on June 25th, the U.S. Coast Guard came across a pod of orcas about 150 miles off the coast of Nantucket. The picture below shows the orcas surfacing beside the CGC Campbell.

A pod of orcas seen from the CGC Campbell. Image: USCG

A pod of orcas seen from the CGC Campbell. Image: USCG

Scientists have been both pleased and puzzled by the unexpected appearances. While the sighting of such rare visitors to New England is certainly exciting, there may be an unfortunate reason for these whales’ presence here. Researchers from Mystic Aquarium suspect that both the beluga’s and the orcas’ movements may be an indication of melting Arctic ice and of the impact this environmental change has on the Arctic’s inhabitants—the whales may have been driven south in search of more abundant food. These aren’t the first polar visitors to New England this year, either—a bowhead whale was spotted in April off the coast of Cape Cod.

The verdict is still out, however, on what the connection is between melting ice and wandering whales. In the meantime, we can enjoy the rare sight of these beautiful creatures.

A diver swims past abandoned netting on the wreck of the Chester Polling.
A diver swims past abandoned netting on the wreck of the Chester Polling.
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Ghost Gear Busters!

Categories: Ocean Oddities

We’re all familiar with some of the impacts that active fishing gear can have on marine wildlife and habitat. But did you know that this gear can keep on fishing, all on its own, long after it’s lost or abandoned?

Almost anyone who’s gone diving in New England has seen lost lobster traps, lines, and pieces of nets on the ocean floor. This abandoned or lost fishing gear is just one of many types of marine debris that litter our coasts and oceans. It’s often called “ghost gear,” and it’s responsible for “ghost fishing.”

The term “ghost fishing” first gained global attention at the 16th Session of the FAO Committee on Fisheries in April 1985. In 2009, the FAO published a full study of what it calls “Abandoned, lost or otherwise discarded fishing gear.”  The report notes how difficult it is to estimate how much ghost gear is out there. But with some anecdotal reports saying New England lobster fishermen, for example, may lose around 20 percent of their pots each year, it’s likely to be a lot.

Very little of this gear is intentionally discarded by fishermen. Vandalism, gear conflicts, and tough fishing conditions are likely responsible for a large portion of gear loss, and storms and strong currents also play a big role in dislodging fishing gear. The 2004 tsunami, for example, caused a major loss of gear and a debris problem in the Indian Ocean. In the northeast, Superstorm Sandy dislodged lots of fishing gear, which NOAA is now working to map and assess.

It’s also unclear exactly how much harm all this ghost gear is causing. We know that ghost gear continues catching fish, marine mammals, and sea turtles—including endangered species—long after it is abandoned. We also know that it can physically harm fragile bottom habitat like corals and kelp and that it can carry invasive species from one region to another. In addition to these environmental issues, ghost gear can create navigational hazards and safety problems and can interact negatively with active fishing gear. Some studies have attempted to quantify the effects of certain types of gear in certain areas, but without knowing how much ghost gear is in the ocean, it’s hard to know exactly what the impacts are.

The good news is that a strong community of divers, fishermen, conservationists, and other stakeholders has formed to remove this debris from the ocean and mitigate the effects of ghost fishing. NOAA’s Marine Debris Program, created in 2006, provides technical advice and information to partner groups interested in removing marine debris. To date, it has collected more than 2.1 million pounds of gear.

Here in New England, its partner groups include Fishing for Energy, a partnership that works in two ways to mitigate the ghost fishing problem—first, by providing bins at ports for fishermen to easily dispose of derelict gear, and second, by providing funding to partnerships to remove marine debris. Recently, Fishing for Energy partnered with the Provincetown Center for Coastal Studies and fishing crews from Cape Cod to remove nearly ten tons of ghost fishing gear, including 320 lobster traps.

Other groups like the Rozalia Project for a Clean Ocean have also been working to assess and remove marine debris in the Gulf of Maine for years. You can even get involved by conducting your own debris cleanup—whether walking on the shore or diving beneath the waves—and sending in information to be added to their database.

We still have a lot to learn about what ghost gear and other debris is out there, where we can find it, and what sort of impacts it’s having on marine ecosystems. In the meantime, collaborations between all ocean users can help lessen the impacts of ghost fishing.

OnaBoat!
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A Boatful of Thankful – Mantis shrimp, Greenland Sharks, and Kids who Love the Ocean

As we approach our national day of gratitude and binge eating, I wanted to say a big heartfelt “thank you” to my muses, the ocean and the people who geek out on it. Here, in no particular order, are just some of the things in and around the sea that I am truly thankful for, and that make the ocean beat the most interesting one on the planet.

 

  • Mantis shrimp: “One of the most creatively violent animals on the planet.” If you haven’t been introduced to these little guys, or to The Oatmeal cartoon about them - now is the time.

 

  • Greenland sharks or, as they are affectionately known, “Canada’s crocodile.” Slow, small-brained, and often blind from eyeball parasites – they still manage to eat large, fast mammals. In fact, one of them took Greenland sharking to a new level recently by taking on a huge hunk of moose meat in Newfoundland. It did not go well, but fortunately some folks were there to help the shark out of its jam when the moose got stuck.  So, I’m thankful for Greenland sharks and for Newfoundlanders cause DANG that is a uniquely Canadian and impressive feat – yanking a huge hunk of moose hide out of a beached shark. A tip of the hat to you all.

 

  • Squid, cuttlefish, octopi – masters of camouflage and the creatures that make me ponder what evolution has in store for humans. If these guys figure out how to take to land I’m not sure we stand much of a chance. I know other people are worried too – because our SciFi aliens often resemble cephalopods.

 

 

 

  • Cashes Ledge. There is a place in New England that looks like a NorCal giant kelp forest, full of all the best kinds of things in the sea (including wolffish). Help us protect it!

 

  • Surfing. If you surf, you know. If you don’t, I can’t explain it without sounding like a total, well, like this guy. Just go try it. And, while we’re on the subject of surfing:

 

  • Great white sharks. They keep us on our toes. (Literally – I would rather be riding a wave then dangling my shark-bait feet in the water off my board). They also inspire awe and wonder, and really funny memes.

 

 

  • My family. They let me tell all these fantastic tales around the dinner table, help me pull out the juiciest details, and give me ideas for stories I never thought of. My kids can now beat most grownups at “ocean trivia.” Proud mom.

 

 

Mahalo to you all!

Lined Seahorse- Hippocampus erectus
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Cool Fish, Hot Water: Seahorses Swim North

Categories: Ocean Oddities

New England’s ocean is getting warmer—and the fish are headed north.

In 2012, water temperatures in the Gulf of Maine reached record high temperatures. NOAA reports that sea surface temperatures in some areas were as much as 11 degrees Fahrenheit above long-term averages, while deep waters were about 3 degrees  higher than average. Temperatures in the first half of 2013 were less extreme, but remained unusually warm. The high temperatures of the past two years aren’t a new development, either—the Gulf of Maine has experienced a long-term warming trend for well over a century.

While these balmy temperatures may be nice for swimmers and surfers, their effect on marine life might not be as positive. The impacts of climate change on the health of marine species are still uncertain, although scientists are beginning to understand how warmer temperatures cause plankton to bloom earlier, help invasive species like green crabs thrive, may cause fish to grow to smaller sizes, and push commercially important species like cod to cooler, deeper waters.

One effect of warming waters in New England has been very clear, though. As ocean temperatures around Cape Cod and in the Gulf of Maine reach record highs, fishermen have started to notice some unusual species on their lines and in their nets—species more typical of warmer waters in the mid-Atlantic or even the tropical ecosystem of the Caribbean. Over the next several posts in this series, we’ll introduce you to some of these new faces.

Our first species—perhaps the most startling example of a once-subtropical species showing up in the Gulf of Maine—is the common seahorse, Hippocampus erectus (also known as Hippocampus hudsonius). Although their range does extend as far north as Nova Scotia, these familiar fish were once only common from the Chesapeake Bay to the Venezuelan coast, and were almost never found in the Gulf of Maine. Most people probably associate these fish with snorkeling on a reef or the tropical tank at the aquarium. But last summer, at least one Maine lobsterman, David Cousens, pulled up several seahorses in his lobster traps—something he’d never seen before.

The evidence for warm-water fish species moving north isn’t just anecdotal. Several scientific studies over the past five years have shown strong evidence that fish distribution is changing in response to climate change. In 2009, scientists from the National Marine Fisheries Service tracked the center points of the populations of 36 fish stocks and found that between 1968 and 2007, nearly all of these species moved north or shifted to deeper water. In 2012, a group of scientists developed an index called the Mean Temperature of Catch, or MTC, which is calculated as the average “preferred temperature” of the species caught in an area. Worldwide, MTC has increased steadily since at least the 1970s, suggesting that global fisheries are catching more species that prefer warmer water.

Most recently, an article published in Science shows that the direction and speed at which the distribution of species changes closely tracks the direction and speed of the effects of climate change. This does not always mean that species move north—off California, for example, stronger winds have pushed cooler waters south, and fish have moved south, too—but it does mean that marine species are redistributing to follow cooler water as temperatures change. In New England, cooler waters are moving north and offshore, and that’s where the fish are headed, too.

Stay tuned over the next several weeks as we introduce you to some of the species that have started calling New England home as our water temperatures rise. These profiles will just skim the surface of the fish moving in to this region—everything from grouper to vivid tropical species like filefish has been spotted in this area in the past few years, and these changes may just be beginning. Whether a beachgoer, a diver, or a fisherman, we will all have to adapt to the changing environment and new species in the Gulf of Maine.

Blue whale with calf. Image credit Andreas Tille.
Blue whale with calf. Image credit Andreas Tille.
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Blue whale ears – more than meets the eye

What’s the first animal that comes to mind when you think of New England’s ocean? Cod? Striped bass? Maybe great white sharks? For me, lately, it’s been the biggest of all the animals that have ever existed – the blue whale. Bigger than any dinosaur that ever pounded the planet or huge ancient shark* that patrolled the warm, primordial sea, their tongues alone weigh as much as an elephant. These leviathans can weigh over 300,000 pounds. You could swim through their heart (but please don’t try).

We may not see them very often, but these endangered animals cruise by here pretty regularly. Why? They take advantage of our very productive waters to fatten up on tiny shrimp-like krill for their long migration from near the poles toward the equator.

Like some of our other, more frequently encountered leviathans, the North Atlantic right whales, blue whales head south for the winter to have their huge babies, but there’s not enough to eat down there (why do you think the water is so clear?), so they head back up when the calves are ready to travel.

Let’s talk about those huge calves for a minute. They measure over 20 feet long, drink about 150 gallons of milk each day from a mother who is on a diet (due to the poor feeding options in the warm calving grounds), and they double in length within 6 months.

That’s all pretty cool, but I know what you’re thinking – why I haven’t talked about anything weird or gross yet? Well, here it is, hot of the presses, new whale ear wax science!

Blue whales’ ears make a long, candle-stick shaped plug of wax throughout the whales lifetime (see below). Scientist are unsure of its function – it might help the whale hear better by channeling the low frequency noises they communicate with to the eardrum.

 

The whale earplug used in the study. Photo credit: Baylor.edu http://www.baylor.edu/mediacommunications/news.php?action=story&story=132825

The whale earplug used in the study. Photo credit: Baylor.edu

 

The wax has “rings” like a tree trunk. There are darker colored rings when the whale is migrating and eating very little, and lighter colored ones when the whale is feasting. This can give scientists big clues about the age of the animal when they harvest the wax from already dead animals. Already pretty interesting, right? But when two scientists at Baylor University recently dug into the biochemistry of the earplug – a novel picture started to emerge.

The wax carries a chemical record of the whale’s life, arranged by year. Hormones produced in the whale’s body are archived in the wax. So the researchers were able to put together never-before recorded pattern of yearly reproductive development and production of stress hormones. Not only that, but pollutants like mercury and pesticides can also be detected in the earplug, giving researchers an idea of what year the whale was exposed to them.

“You have this 100-year-old question: How are we impacting these animals? There is ship traffic, environmental noise, climate change and contaminants. Now, we are able to provide definitive answers by analyzing whale earwax plugs,” said Dr. Sascha Usenko, one of the scientists who developed this technique.

The best part – while the science being used to study the ear wax is new, scientists have been collecting the ear plugs for decades from animals that have been found all over the world. So, knowing the date an animal was found and its age, researchers can figure out what kinds of chemicals the animal was exposed to and possibly link this to our activities on land (for example, increased coal burning or pesticide use), helping us piece together just how much we’re changing this big pond of ours. And, hopefully, we can think even more about how to stop dumping so much ick into our air and water.

Whatever we decide to do with the knowledge – this is a huge new story about the ocean just waiting to be told, from the whales’ ears to ours.

* Please note: megalodons are very extinct, regardless of the Discovery Channels claims to the contrary.