logo2004.jpg (16388 bytes)CORE NEWS Online

A Word From the Director

First, apologies are in order for the tardiness of this issue! To make up for it, we’ve created a double-issue packed with really interesting articles written by most of our staff and interns! In this issue, you will learn about the varied subject ranging from the microscopic causes of "red tide" to the incredibly interesting way that whales are able to stay under water for prolonged periods! We hope you will enjoy this newsletter.

If you have seen past issues of CORE News, you will notice a format change in that the list of Members and Whale Sponsors is missing in this issue. Those lists will now only be featured once per year to allow for more room for pertinent articles about CORE and whales.

Members will receive reminders about renewing their memberships and our whale sponsors can find the expiration date for their adoptions on the mailing label of this newsletter. If you are due to renew, please refer to the order form on the last page! Whale sponsors can see updates on their whale’s sightings in 2005 on our upcoming redesigned website - it should be up and running by the end of March...Rest assured, Badge, Shark, Owl and Sockeye are all doing very well and were all sighted several times in 2005!

For those of you who know CORE, you will be eager to read about the incredible new program developed by our talented Education Coordinator, Jess Taylor. The Seaside Naturalist Program is offered North Shore communities every 1st and 3rd Mondays from May through October! It is designed for children of all ages (adults enjoy it immensely, too!) Our first program last year was a smashing success!

Also of note was our wonderful fundraiser evening cruise which happened last September! Many, many thanks to all of the wonderful people who donated prizes for the auction, as well as those who participated in the cruise! We were able to raise a little over $2000 during this event! We will be doing another fundraiser evening cruise this summer - please keep watch on our website and in our summer newsletter for the date!

The staff of CORE would like to offer a giant thank you to Jerry & Carol Hill of the Yankee Fleet. Not only did they donate the beautiful Yankee Freedom for the evening cruise, they were nice enough to donate prizes for the auction! In addition, the Hills donated the start-up funding for the Seaside Naturalist program! We are truly grateful for their continued support of all of our programs.

Thanks are in order, as well, to Robin and Chuck McCann whose generosity seems utterly boundless! Not only does Robin create and donate the gorgeous stained-glass windows for our yearly raffles - replete with printed raffle tickets - they’ve also donated a badly needed computer. On top of all that, Chuck created a brand new, very useful database for our center. All of their efforts are beyond appreciated!

For those of you who tried participating in our research trips last season, you know Mother Nature had other plans for all of us! We were all very disappointed that these trips were cancelled, but safety is always, of course, our main concern. We have two trips slated for the 2006 season - let’s hope for good weather and calm seas this year! Dates and prices are in the side bar to the right...

Lastly, the entire staff of CORE would like to extend our sincere thanks to all of you who continue to support our ever expanding scope of research and education programs. With your donations, we have significantly increased our community outreach as well as better equip our office and acquire research gear for the boat and office. Thanks again to all of you!

 

Rare Whale Sightings ~ By Sarah Podleski, CORE Staff Scientist

During the summer of 2005 there was a preponderance of Northern Right Whale sightings in our study area. These individuals are members of a surviving population of approximately 300 animals, making them the most critically endangered species of baleen whale in the world.

It is quite unusual to sight these whales in the waters of Stellwagen Bank National Marine Sanctuary during the midsummer. These animals are very highly specialized predators, feeding only on a specific type of zooplankton called copepods; scientific name Calanus, and only copepods that are large enough to get caught in their baleen. During the spring and summer of 2005, there had been a noted lack of Calanus in Cape Cod Bay in recent months. It is possible that the Northern Right Whales are entering our study area to the North in search of suitable food.

During an August whale watch, 5-6 individuals were sighted together in the sanctuary against an eerie backdrop; the Boston skyline. Less than a mile from the animals a tremendous tug and barge was passing by. The whales were casually unaware of the fact that they were crossing into Boston shipping lanes.

Ship strikes are the number one cause of Northern Right Whale mortality. Encounters with vessels over 100 feet in length are almost always fatal, either through instantaneous shattering of the spine or through blood loss and secondary infections. Smaller vessels can also cause major injuries, which are unfortunately on the rise. This highlights the need for immediate, accurate, and widely broadcast reports of Right Whale sightings; which can be achieved by contacting the U.S. Coast Guard.

Federal guidelines have been put in place for all mariners to follow in order to cause the least possible disturbances to the whales. It would be prudent of all seafarers to familiarize themselves with these laws and also with the appearance and behavior of these and all whales that they may encounter. These whales are endangered due to hunting by humans and it is now our moral and legal responsibility to protect the few remaining individuals. For information on whale watching guidelines, visit www.nmfs.noaa.gov/pr  

Endangered Species Act – At Risk of Extinction? ~ By Deanna Leonard, Assistant Director

The Endangered Species Act (ESA) of 1973 is by far the most contentious environmental statute enacted during the Nixon administration. Its mandate to not only protect imperiled plants and animals, but to conserve their critical habitats clashes with the goals of wealthy landowners, industrialists, and commercial developers. The act has always had its opposition and the petition to weaken it has always been strong, but with the shifting political agendas of the Bush administration, a new brew of legislation threatens to severely cripple the power of the ESA and eventually do away with the landmark law.

Currently over 1,200 U.S. species and 550 foreign species are listed as either threatened or endangered. Once listed, some of the most significant protection comes from protecting "critical habitats" - the homes of the animals enlisted. The act also requires the development and implementation of recovery plans, which identify a wide range of actions to help recover a species. These can include reintroduction of a species into formerly occupied habitats; land management; landowner agreements that preserve or enhance habitats; captive breeding; habitat restoration; population assessments; research, and public education. Since enacted, the law has played a major role in preventing the extinction of hundreds of species of plants and animals in the United States. 99% of the species listed remain on the planet today and 68% are either stable or improving.

Designated the "Threatened and Endangered Species Recovery Act of 2005," the draft bill would impose a bureaucratic overlay to reduce the effectiveness of the ESA. Essentially, the bill changes the mission of the act by redefining critical habitat, cutting scientists out of important wildlife decisions, and undercutting the use of the best science in accessing species’ protection. It would also weaken enforcement of the act by narrowing the reach of the law in controlling agencies like the Forest Service, and allowing exemptions of federal actions which are currently subject to review. Even more dramatic is the section of the bill that obligates a "sunset clause," meaning all provisions of the ESA will be removed by October 2015, essentially killing the act itself.

Habitat degradation is the primary reason for most species becoming endangered yet this new legislation places major restrictions on mapping the territory that is essential for the recovery of endangered species. It restricts critical habitat to areas currently occupied by a species and doesn’t allow inclusion of its historic range. It also short changes the long term goals of complete recovery of a species by settling for the lesser goal of keeping the current rate of decline from getting any worse.

Despite the aggressive nature of legislation, these recent attacks on the 32 year old law may not have the impact that was expected. Advocates of the ESA are fighting back to strengthen and maintain protection for endangered species. In 2003, a national campaign was created with the aim of defending the ESA. Designated the Unified Endangered Species Campaign, the working group consists of 6 environmental groups who are committed to preserving America’s natural heritage. They are: the Center for Biological Diversity; Earthjustice, Endangered Species Coalition; National Wildlife Federation; Natural Resources Defense Council; and Sierra Club. The campaign also works to support the efforts of hundreds of other nonprofit organizations working on Endangered Species issues.

The Endangered Species Coalition has been touring the critical habitats of many endangered species around the country and inviting reporters to attend to bring attention to the current political situation. Included in their tour was a visit to the Stellwagen Bank National Marine Sanctuary here in Massachusetts Bay in May. They used the trip to demonstrate the success of the ESA, interviewing CORE researchers about the recovering whale populations in the Atlantic and the significance of the sanctuary designation back in 1992. They also emphasized the recovered Pacific gray whale population as an example of the law’s success. Hopefully, through extensive grassroots work, education, discussions with lawmakers, and the dissemination of information, the campaign will ensure that the Act itself as well as the species it protects, can be passed on safely into the future.

In 1973 the people of this country took arms in a battle to create the ESA and the people won. Today that victory is being challenged and for those who still believe in those goals, the onus is on us to fight again and carry forth that same dedication in protecting the essential landmark law that so many daringly fought to create.

Diving Adaptations of Whales ~ By Jamie Gibbon, CORE Staff Scientist

When the ancestors of modern whales entered the sea 50 million years ago they faced a considerably different environment from their previous home on land. Their prey now lived where they could not breathe, at depths where sunlight doesn’t penetrate and temperatures drop dramatically. They had to adjust to moving in water, diving to incredible depths while going long periods without air, and avoiding the dangers of nitrogen poisoning that could be fatal. They developed several physiological adaptations that allow them to flourish in the vast ocean habitat

Modern whales have lost all unnecessary appendages that would slow them down while traveling in water. In place of legs, extensions of fibrous elastic tissue form the flukes of a powerful tail. External ears are also lost, while the genitalia are tucked inside for streamlining. Hair does little for warmth in water and reduces drag, so all but a few sensory hairs remain.

The density and buoyancy properties of water do away with the size limitations, while the immense body size of modern whales also provides a very small surface area to volume ratio which allows them to slip through the water more easily. Telescoping of the skull moves the nostrils far back on a whale’s head, making breathing at the surface much more efficient while swimming. All of these adaptations provide a sleek shape which allows whales to travel faster and better through the water.

Whales also have a thick layer of blubber that surrounds their bodies which has three main purposes, the first is another adaptation that reduces drag. The whale’s skin and blubber are not firmly attached, allowing the blubber to shift and change form, further streamlining the whale while swimming. Blubber also provides valuable insulation, important to the survival of warm blooded mammals in cold water. Diving to depths where the water temperature is just above freezing, the thick fat layer of prevents heat loss and conserves energy. Lastly, the blubber is made up of high-energy lipids that provide a large enough food store to take care of the whale’s energetic needs during their yearly migration and fasting period. Imagine being able to go six to seven months without any food at all!

Because a whale’s dive may last up to an hour and take them thousands of feet below the surface, they must take enough oxygen with them. While whales have proportionally smaller lungs than other mammals, they can exchange up to 90% of their lungs’ volume with each breath, compared to only 15% for humans. Additionally, whale have larger and many more red blood cells than other mammals, which allows them to store more oxygen. They also have up to ten times more myoglobin than terrestrial mammals. Myoglobin is the protein that stores oxygen in the muscles. The extremely high level in whales allows their muscles to work much more efficiently.

During a deep dive, oxygen is conserved by a slowed heart rate and controlled blood flow. Oxygenated blood is directed only to vital organs such as the heart and brain during a dive. To counteract the effects of nitrogen poisoning, also called the "bends," any extra air remaining in the lungs is forced into the trachea, where nitrogen gas and other gasses cannot be absorbed into the blood.

While all whales have the special adaptations described above, Sperm Whales, the champion divers of the sea, have a few special features that allow them to dive to depths of up to 10,000 feet and stay submerged for up to two hours at a time. Their breathing pattern is one of these important features. Sperm whales will return after their dives and float on the surface while they take a breath every ten to twenty seconds. After recharging for up to an hour, they will dive again.

The second is its very unique spermaceti organ that is found only in the head of the Sperm Whale. This organ is composed of layers of muscle sandwiched between layers of oil filled connective tissues. In adult Sperm Whales, this organ can hold up to four tons of oil.

The organ is surrounded by blood vessels and nasal passages. Scientists believe that the whale can change the temperature of the oil by altering the flow of blood and water around the Spermaceti. If the oil is surrounded by cold water from the nasal passage, it cools and becomes denser, allowing the whale to sink. If it is exposed to warm blood flow, the oil becomes more buoyant, allowing the whale to rise to the surface. This is likely how these whales dive to such incredible depths in pursuit of their favorite prey, the giant squid.

Red Tide: The Skinny ~ Carrie Swail, 2005 CORE Intern

The nor’easters that hit in mid-May of 2005 may have been bad for whale watching but scientists believe they were good for stirring up lots of nutrients. Unfortunately, this stirring may have contributed to the spread of the worst red tide outbreak in New England in decades. The outbreak began in the Gulf of Maine in May and spread to Massachusetts and Cape Cod Bays. While this meant bad news for shell fishermen from Maine to Cape Cod, CORE interns seized the opportunity to educate the public about red tide.

Red tide is a common name for a phenomenon where phytoplankton or unicellular algae grow rapidly forming dense sometimes visible patches near the surface of the water. Contrary to its name, a red tide may color the water red, brown, pink, violet, orange, yellow or green depending on the color of the phytoplankton. Red tides are commonly caused by types of phytoplankton known as dinoflagellates and diatoms.

Not all phytoplankton blooms are harmful but the name "red tide" is used to refer to ones that are. Scientists prefer the term "harmful algal blooms." What makes red tides harmful is that some species of phytoplankton produce biotoxins, which are naturally occurring toxins. At low levels these toxins are harmless, but during a red tide bloom the biotoxin reaches high levels that can be toxic to both marine life and humans. We are potentially exposed to these toxins by eating shellfish. Shellfish are filter feeders, which filter the plankton out of the water and concentrate the biotoxins in their bodies. People are warned to stay away from shellfish during red tides, including mussels, oysters, and clams (scallops and lobsters are OK because we don’t eat the bodies).

The red tide that was affecting New England waters this summer was caused by a dinoflagellate called Alexandrim fundyense. This particular species of phytoplankton produces a biotoxin by the name of saxitoxin which is responsible for Paralytic Shellfish Poisoning. Paralytic Shellfish Poisoning or PSP can cause tingling or numbness in the face, nausea, vomiting and diarrhea. In severe cases there can be muscular paralysis leading to difficulty breathing and possibly even death.

Yes, red tides can affect marine mammals, specifically whales, although the one we are experienced in 2005 does not. Whales feed either directly on plankton or fish that feed on plankton, passing the biotoxins on up the food chain. There are known cases of whale deaths being linked to biotoxins produced by phytoplankton. For example, in 1988, brevetoxin, produced by the dinoflagellate Gymnodinium brevis, was thought to be the cause of the deaths of several hundred Atlantic bottlenose dolphins and almost 30 humpback whales. Whales are thought to be particularly susceptible to biotoxins for two reasons. First, during a dive the blood is concentrated in the heart and brain and away from the liver and kidney where the toxins could be excreted. Second, even a slight period of disorientation, caused by the toxin affecting the nervous system, can be enough to keep a whale from surfacing for a breath, causing it to drown.

As for the red tide in the Gulf of Maine, according to scientists from Woods Hole Oceanographic Institute (WHOI) who were monitoring the status of the outbreak, the levels of the harmful algae in Massachusetts Bay decreased and slowly shellfish beds were reopened. This was certainly good news to shellfishermen who lost an estimated $3 million per week due to the closures.