NOAA releases draft proposal to expand Thunder Bay National Marine Sanctuary

June 14, 2013

Just below the surface of Lake Huron, a diver photographs the German freighter Nordmeer, which ran aground in 1966 and eventually sank in 40 feet of water. The relatively shallow depth of the wreck site provides divers more time to explore the twisted steel hull.

Download here (Credit: NOAA, Thunder Bay NMS.)

NOAA today released for public comment a draft environmental impact statement (DEIS) and proposed rule for expanding the boundaries of Thunder Bay National Marine Sanctuary in Lake Huron from its current 448 square miles to 4,300 square miles.

The proposed expansion is based on several years of research by NOAA and its scientific partners as well as public input, and would include protection of an additional 47 known historic shipwrecks.

During the process to review the sanctuary’s management plan in 2006, NOAA received comments expressing interest in expanding the sanctuary’s boundary to include the waters adjacent to Alcona and Presque Isle counties in Michigan. Specifically, several local government and non-governmental organizations passed resolutions or submitted written letters of support for boundary expansion.

Additionally, in 2007, the Thunder Bay Sanctuary Advisory Council adopted a resolution supporting expanded boundaries. NOAA held three public scoping meetings on this topic in April 2012.

“The proposal to expand the sanctuary is the result of a collaborative effort that involved considerable input from all sectors of the local community,” said Jeff Gray, sanctuary superintendent. “We welcome further public review and comment as we go forward with the important job of managing this special place which is important to the regional economy and protects world-class historical and recreational shipwreck sites.”

With its heavy-duty windlass still on deck and anchor chains and rudder still in place, the E.B. Allen presents a vivid image of a typical nineteenth-century Great Lakes schooner. The Allen sank in 1871 after a collision with another vessel.

Download here (Credit:NOAA, Thunder Bay NMS)

The sanctuary’s Great Lakes Visitor Center has become a major tourist destination and economic stimulant in the region. According to a 2005 study on total visitor spending in the region, the sanctuary impacts $92 million in sales, $35.8 million in personal income to residents, and 1,704 jobs.

One of 14 sites managed by NOAA’s Office of National Marine Sanctuaries, Thunder Bay sanctuary currently protects 45 nationally significant shipwrecks. Research indicates that as many 100 shipwreck sites are yet to be discovered in northern Lake Huron. Through increased tourism and related business development, the sanctuary is working with various partners to encourage sustainable tourism in the region, and foster a broader awareness of the Great Lakes and their rich maritime heritage.

The DEIS and proposed rule are available for download at thunderbay.noaa.gov. All comments must be received by August 13. Written comments should be sent by mail to: Jeff Gray, Sanctuary Superintendent, Thunder Bay National Marine Sanctuary, 500 West Fletcher Street, Alpena MI 49707.

Comments may also be submitted electronically via the Federal eRulemaking Portal http://www.regulations.gov. Under document type, select “Proposed Rule,” under Keyword or ID, type in NOAA-NOS-2012-0077. The documents are also available for review at the Thunder Bay National Marine Sanctuary’s headquarters office in Alpena.

Public hearings will be held at the following locations:

July 15, Presque Isle District Library, Rogers City Location, 181 East Erie Street, Rogers City, Mich.July 16, Great Lakes Maritime Heritage Center, 500 W. Fletcher Street, Alpena, Mich.July 17, Alcona County Library, Harrisville Branch, 312 W. Main, Harrisville, Mich.

Thunder Bay National Marine Sanctuary, designated in 2000, spans 448 square miles in northern Lake Huron. Jointly managed by NOAA and the state of Michigan, the sanctuary’s mission is to preserve nationally-significant shipwrecks and other maritime heritage resources through resource protection, education and research. Well-preserved by Lake Huron’s cold, fresh water, these shipwrecks span 150 years of Great Lakes maritime history.

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Research reveals bottom feeding techniques of tagged humpback whales in Stellwagen Bank National Marine Sanctuary

Contact: Vernon Smith, 301-713-7248
Anne Smrcina, 781-545-8026 x204 Research reveals bottom feeding techniques of tagged humpback whales in Stellwagen Bank National Marine Sanctuary

New NOAA-led research on tagged humpback whales in Stellwagen Bank National Marine Sanctuary reveals a variety of previously unknown feeding techniques along the seafloor. Rather than a single bottom feeding behavior, the whales show three distinct feeding approaches: simple side-rolls, side-roll inversions, and repetitive scooping.

A recently published paper, in the journal Marine Mammal Science, indicates that bottom side-roll techniques are common in Stellwagen Bank National Marine Sanctuary and the Great South Channel study area, a deep-water passage between Nantucket, Mass. and Georges Bank-further southeast.

The study further states that the observed feeding behavior also leads to vulnerability to entanglement in bottom set fishing gear, an issue which is a major mortality factor for the species. This finding reaffirms a NOAA Fisheries regulation that mandates the use of sinking line between fishing traps used in the lobster fishery as a way of reducing entanglements.

The new findings follow earlier NOAA-led studies detailing so-called "bubble net" feeding behaviors near and at the surface. Bubble net feeding is a behavior in which humpback whales corral and contain fish into a small area by trapping them in nets of air bubbles so they can more efficiently scoop them up in their large filter-feeding mouths.The behaviors are used by individual animals and as part of coordinated feeding behaviors involving two or more animals.

"Tagging technology is allowing us to observe whales underwater, much as land-based biologists study animal subjects in their specific environments," said David Wiley, sanctuary research coordinator and a co-author on the paper. "The data have allowed us to detect new feeding techniques as well as nuances in those behaviors. We have determined that bottom feeding is a much more commonly used technique than the more well known bubble net behaviors."

Bottom side-rolling feeding was previously hypothesized from observations of scars on the jaws of humpback whales and from earlier tagging projects. In the recent studies, researchers showed that this behavior happens for extensive periods of time at or near the seafloor, that it occurs in the presence of concentrations of sand lance (a preferred prey fish), and that the behavior is accompanied by the expansion of the animal's ventral (throat) pleats.

Information was collected through the use of DTAGs (synchronous motion and acoustic recording tags) and Crittercam™, National Geographic Society's underwater video and audio recording system.

Humpback whale with a scrape on its rostrum. Scientists say injuries such as this one are sometimes a result from bottom-feeding. (Credit: NOAA/Stellwagen Bank National Marine Sanctuary )"By visualizing the data with TrackPlot, we can actually see how the whale moves underwater and this enables us to discover different kinds of foraging behaviors," said lead author Colin Ware of the University of New Hampshire's Center for Coastal and Ocean Mapping. TrackPlot is a custom software tool for DTAG data that produces a ribbon-like image in three dimensions. "With these 3-D visualizations, we can follow the path of the whale from surface to seafloor along with all of the pitch, roll and heading changes while underway. By adding Crittercam video, we now get a more complete understanding of these various bottom feeding techniques," Ware said.

A side-roll is defined as a roll of between 45 and 135 degrees from a normal orientation along the seafloor - the most common version uses a 90 degree roll with a downward head pitch of about 30 degrees, which matches favorably with earlier speculative sketches of bottom feeding. A side-roll inversion involves rolls that continue past the 135 degree orientation position. One humpback used a technique that employed a repetitive sequence of moves approximately every 20 feet during which the animal rolled from a 90 degree position to an inverted position, with some 10 to 17 of these "scoops" per dive.

The whale's body orientation during bottom side-roll feeding is depicted in this computer-generated image. (Credit: Colin Ware, University of New Hampshire Center for Coastal and Ocean Mapping)Sand lance, also known as sand eels, tend to burrow into the sandy sediments at night or form nighttime horizontal schools close to the seafloor. In addition, Crittercam footage indicates that sand lance can form dense mats along the seabed during the day. The side roll feeding technique with extended pleats emphasizes width rather than height, resulting in more efficient feeding when encountering prey at or near the seafloor. Coordinated feeding may also help cluster prey or simply ensure that it does not escape. Crittercam footage also showed for the first time a head-to-head orientation for two animals that were side-rolling at the seafloor.

While this humpback bottom feeding behavior occurs at relatively slow speeds, it does involve the expansion of ventral pleats, which was once thought to require high speeds, as in lunging. The researchers theorize that humpback side rolls may be similar to the feeding technique of gray whales in the Pacific. The three types of bottom feeding techniques may be due to different prey distributions or may just reflect individual preferences between whales. In this 3D computer visualization, the roller coaster-like movement of a tagged humpback whale in Stellwagen Bank National Marine Sanctuary is captured over a nearly two-hour period. The whale traveled at depths ranging from 30 to 150 feet deep. The red and blue triangles along the ribbon show the whale's powerful fluke, or tail fin strokes that propel it through the water. The yellow sections along the ribbons indicate where bottom side-roll feeding occurs. (Credit: Colin Ware, University of New Hampshire Center for Coastal and Ocean Mapping)

Funding and additional support came from NOAA Office of National Marine Sanctuaries, NOAA Office of Marine and Aviation Operations, NOAA-University of New Hampshire Center for Coastal and Ocean Mapping, Office of Naval Research, National Oceanographic Partnership Program, Duke University Marine Laboratory, National Geographic Society, International Fund for Animal Welfare, Pacific Life Foundation and the Volgenau Foundation.

Designated in 1992, Stellwagen Bank National Marine Sanctuary encompasses 842 square miles of ocean, stretching between Cape Ann and Cape Cod offshore of Massachusetts. Renowned for its scenic beauty and remarkable productivity, the sanctuary supports a rich diversity of marine life including endangered great whales, seabirds, more than 60 species of fishes and hundreds of marine invertebrates.

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