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Showing posts with label marine mammal. Show all posts
Showing posts with label marine mammal. Show all posts

Monday, February 20, 2012

Manatee Mania

 
 I last visited the manatee of Crystal River, Florida in 2010.  It was an especially hard year for them with horrific cold snaps that left many dead from cold-stress syndrome.  This year has been far more forgiving.  From the archive: Magic Number for Manatees

The area is growing - a new boardwalk allows visitors to view the manatee resting in the springs without the need to get wet.  A visitors center with lots of educational exhibits is being planned. There was more monitoring, lots of gentle corrections ("I'm sorry but no, you can't hug the manatee back.") and tons of happy visitors. 

And how do the manatee feel about all of this attention?  Well, the numbers utilizing Kings Bay are on the rise.  U.S. Fish and Wildlife Service has established a seasonal refuge (Nov-March) with key areas of Kings Bay cordoned off just for manatee: no fishing, no scuba, no boats and no swimming. 

The increase numbers of manatee also bear an increase number of scars.  With so many manatee in the water at one time it's easy to see how they come into conflict with boats.  We witnessed one pontoon boat collide with a manatee in a side channel - luckily the boat was going very slowly and the manatee showed no signs of serious injury but the strike could have been avoided. 

  1. Wear polarized sunglasses while operating a boat so you can more easily see manatee in the water.
  2. Manatee like to feed on shallow sea grass beds - use a pole, paddle or a trolling motor to avoid pinning them.
  3. Slow down!! Idle speeds are your friend in manatee zones.  Believe the signs.
  4. Check around your motor before starting your engine. Manatee like to rest in the shade of boats.
  5. Do not feed manatee.  It encourages them to approach boats and not everyone is going to be as nice about it.
  6. Don't pollute - fishing lines and plastic bags  can cause no end of trouble with unsuspecting marine life.
 
Scars from an encounter with a boat motor

Sunday, February 6, 2011

Northern Elephant Seals prepare for Valentine's Day

A bull seal showing the wounds from a recent fight
A young male comes ashore to test the Alpha bull
No trip down the coast would be complete without a stop to check in on the Northern Elephant Seals (Mirounga angustirostris).  In early December the large males begin to arrive on the beaches, establishing their territory and sizing up the competition.  The battles are fierce and bloody but rarely deadly and to the victor go the spoils.  The 'Alpha' bull gets the privilege of mating with all of the females of his harem which can consist of anywhere from 30 to 100 females.
The intruder is chased off by the Alpha
Females arrive on the beaches mid to late December and give birth to the next generation.  These pups are jet black earning them the nickname "black coats".  Approximately 75 pounds at birth, the pups nurse on fat-rich milk for 25-28 days.  Incredibly they can reach between 250-350 pounds in this short time period!  Once they are weaned they lose their black coat, molting into a silver gray.

Females bear one pup but orphaned pups take advantage where ever they can
After weaning her pup, Mom mates with the alpha bull (Valentine's Day usually falls at the height of the mating season - fancy that!) and then abandons the pups to learn to fend for themselves.  They spend the next few weeks climbing through sand dunes, chewing on everything they find, playing in tide pools and eventually taking to the sea as they learn what it means to be a seal. 
Black coat preparing to nurse
Mother and black coat pup bask in the morning sun

Where to view North Elephant Seals:
Año Nuevo State Park: Reservations required

Piedras Blancas, San Simeon
Walkways open to the public year round and admission free

The Marine Mammal Center
Marin Headlands near Sausalito
Rescue and rehabilitation
Open to the public 10am - 5pm daily
Free admission


A bull issuing his trade-mark battle-call


Thursday, March 4, 2010

The Magic Number for Manatees: 68

The Florida Manatee (Trichechus manatus latirostris) is a sub-subspecies of the West Indian Manatee that is found in lakes, rivers, estuaries, springs, lagoons... well basically any water source that is more than 3 feet deep in Florida. Fresh, brackish or salt makes no matter to them.

Manatee Facts:
Length 10-13 feet (3.0m-3.9m)
Weigh 1,000-3,500 pounds (453.6 kg-1,588 kg)
At birth:
3-4 feet (0.9-1.2 m) long
60-70 pounds (27.2-31.8 kg)
Calves gain approximately 700 pounds (318 kg) during their first year of life.
Males reach sexual maturity between 6-9 years
Females mature 5-9 years
Lifespan: 60 years or more

Like any good Floridian, what the Florida Manatee DOES care about is the temperature. If the water drops below a cool 68 degrees Fahrenheit they head for the nearest spring or power plant to warm up. This year has been especially hard on the manatees in Florida with over 219 deaths from the cold. Manatee cold-stress syndrome involves metabolic, nutritional, and immunologic factors. Symptoms may include weight loss, skin lesions or abscesses, internal fat loss, dehydration, constipation and other gastrointestinal disorders, internal abscesses, and other secondary infections.*1

The IUCN Red List categorizes the Florida Manatee as 'Endangered' *2 due to a population of less than 2,500 animals and an anticipated decline of 20% in the next two generations. As such, the manatee is under the protection by the 'Endangered Species Act of 1973, the Marine Mammal Protection Act of 1972 and the Florida Manatee Sanctuary act of 1978. These laws state that "It is unlawful for any person, at any time, intentionally or negligently, to annoy, molest, harass or disturb any manatee". These regulations are pretty clear to me... if you cause a change in a manatee's behavior, you are in violation of the law. So you can imagine my surprise when my friends and I were told by law enforcement, that a man who caused a manatee stampede wasn't actually violating any laws. Excuse me?

In the two days that my friends and I visited the Three Sisters Spring in Crystal River (critical manatee habitat) we witnessed many wonderful manatee/human interactions. Volunteers in kayaks were educating visitors, gently reminding them to avoid splashing and squealing loudly with delight (something that even I found hard not to do when these adorable creatures looked me in the eye). People were swimming calmly and quietly, viewing the manatees sleeping and resting and doing basically what manatees do. There were a few bumps, a few timid pats and strokes mostly initiated by the manatees themselves (still not kosher per the law but seemingly without causing harm to the animals) until the second morning we arrived at the spring.

As I entered the channel that leads to the spring I was greeted by a wall of fast moving, panicked manatee flesh. If you have ever had the pleasure of experiencing the company of a manatee you know they are ponderous, deliberate and slow moving creatures. They conserve their energy. This was a mass exodus of terrified animals. There were well over 50 manatees pushing through the narrow channel, bumping into each other and the rocks, pushing past with such force I was bowled over - a less confident swimmer might have had trouble with the situation. When I was able to join my friends inside the spring I found out what spooked the animals. One man. Swimming freestyle. Splashing his arms and kicking hard, his fins slapping the water loudly. He circled the small pools where the manatees were sleeping in aggressive, fast circles causing the poor creatures to startle out of their slumber. When this man was approached and told he was disturbing the manatees he became very confrontational, screaming that my friend had no authority to tell him what he could do, he was entitled to swim any way he pleased! He swims like this "three times a week. Yeah, they get upset and then they calm back down. It's no big deal." Well, actually, it is a big deal ESPECIALLY during a cold snap when the manatees are already under great stress. It's AGAINST the LAW and the law is there to PROTECT the health and welfare of an animal. Two officers were called to the scene and while the Fish and Wildlife officer agreed that what the man was doing constituted harassment, the peace officer did not and no citation was issued.

I was and still am astounded. I just wish I had been able to video tape the manatee's reaction so I could show exactly what happened. By the time we realized what was going on and that he was intentionally disturbing the manatee and was refusing to stop, the majority of animals had left the spring and knowing that our video camera was following him, he toned his swimming down so it wouldn't look so bad. If you happen to be in the area and witness this guy... do NOT confront him - he's looking for a fight and is very aggressive - if you can, take some footage and report him to the Fish and Wildlife Conservation Commission (phone number is listed below). The only thing that will stop him is a cold, hard fine from someone in authority. A comment on an image I posted to Flickr struck me as cutting right to the heart of the matter "Unfortunately, we seem to have a never ending supply of people who don't understand their rights stem from the obligation to use those rights responsibly." I saw joy, respect, caring and excitement from so may visitors during my time at the Springs... it's too bad that it only takes one irresponsible person to cause so much grief for one endangered creature.

For more information and ways you can help the Florida Manatee check out the links below:

*1 Florida Fish and Wildlife Conservation Commission, Fish and Wildlife Research Institute
*2 IUCN Red List of Threatened Species