Chris Imhof, November 10, 2009

NOAA Teacher at Sea
Chris Imhof
Onboard NOAA Ship Pisces
November 7 – 19, 2009

Mission: Coral Survey
Geographic Region: Southeast U.S.
Date: November 10, 2009

Science Log

Ida has impacted things somewhat – the wave height at the offshore buoy at Pisces’ departing port rose to 18 to 22 feet in an hour – eventually the port was closed. The latest is the Pisces will go to sea in the next day or so. This will probably delay the arrival of the ship here by a day.

While waiting this out I’ve taken some walks along the St. John River, which runs through downtown Jacksonville to the ocean. Essentially it is a large estuary that mixes freshwater and sea – creating an environment for all sorts of interesting creatures including the Florida Manatee (Trichechus manatus latirostris).

These creatures fall under the Order Sirenia – which goes back to Greek mythology and the Sirens – beautiful women who would lure sailors and ships onto the rocks and reefs with their songs – apparently after a long voyage across the Atlantic sailors mistook these creatures as beautiful women or mermaids and the name stuck – Maybe this explains the success of the Sturbucks logo. Even early scientists who first began to study the manatee saw them as a close relative to of the walrus – makes sense – actually the closest relative to the manatee is the elephant! One really wonders to connection to Ariel?

I asked around where I might see one of these creature here? I walked to an area away from main part of town – along the river where I was told manatees sometimes come to feed – the waves were choppy and murky so I could’nt see much, but no surprise manatees do spend 6 to 8 hours a day eating up to 200 pounds of vegetation along the bottom of these areas – grinding up grasses and other vegetation using 24 to 32 flat surface molars in the back of their mouths. Grinding that much ruffage a day has its toll, not just on one’s lower intestine – manatees have adapted by growing new teeth constantly – over a lifetime can grow up to 60 new teeth. Manatees take care of their teeth as well – after eating they clean their teeth using stiff grassy plants like a tooth brush – they even roll small rocks in the mouths to loosen plant debris.

Unfortuneatly, there are less than 2000 Florida manatees left – they are often the victims motorboats, cold water stress and destruction of habitat. While I was looking, people I talked to were proud to talk about the efforts to protect the manatee along the St. John River –

So today I didn’t see a manatee, but maybe my problem was – I was looking for that mermaid on the side of my Starbucks cup. 🙂


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