NOAA Teacher at Sea
Mary Anne Pella-Donnelly
Onboard NOAA Ship David Jordan Starr
September 8-22, 2008
Mission: Leatherback Use of Temperate Habitats (LUTH) Survey
Geographical Area: Pacific Ocean –San Francisco to San Diego
Date: September 10, 2008
Weather Data from the Bridge
Latitude: 3736.6398 N Longitude: 12336.2210 W
Wind Direction: 220 (compass reading) SW
Wind Speed: 11.3 knots
Surface Temperature: 14.638
Science and Technology Log
The mid-water net was just deployed. This is a new net for the research team to use. On the trip north, during the first part of this cruise, the last net became mangled during use. A new, larger net was obtained and the crew is working out how best to deploy it. After three tries, they seem to have determined the best way to lay it out, release it, and winch it back in. The David Starr Jordan is now heading over to the off shore area outside of Point Reyes, where the plan will be to deploy it for only one to two minutes.
The jellyfish there are usually so numerous that they will fill the net immediately. Leatherbacks eat jellyfish of many kinds, but they love the types in the Pelagiidae family. These are the types with long hanging arms, which the turtles snack on until they get up into the body cavity. The jellyfish are then eaten from the insides, with a soft-bodied bell left behind. The bell-shaped body of this family can be as large as 55 cm. The favorite of leatherback, so the one we will hope to find in abundance, is the Sea nettle, Chrysaora fuscescens. These are most numerous in August and September in specific locations off the California coast, so it can be anticipated that leatherbacks will also be found there. The predictability of this occurrence is the reason leatherbacks have evolved to travel the Pacific Ocean from Asia every year.
The ship, David Starr Jordan, was built in 1965, so is among the oldest of the fleet of NOAA research ships. The age can be found in the cabinet design, the flooring material and little features. Never the less, it has been built for sustained trips at sea for up to 23 days in length. There is a steward on board who creates elaborate lunches and dinners daily. Last night’s dinner included Filet Mignon, shrimp in butter sauce, two soups, sautéed vegetables, and at least four other hot dishes. There is always a salad bar set up and 24-hour hot beverages, cereal, toast, ice cream, yogurts and fruit. Everyone eats well.
In the crew’s lounge, drawers of over 200 current films are stored, including new releases. They have been converted to 8 mm tape to accommodate the video system on board. There is also a small gym with a treadmill, stationary bicycle and bow-flex machine. A laundry room completes the ‘home’ environment. At least three showers are available. The ship has a system to desalinate water, which is a slow process, so water conservation is suggested. This means: wet yourself down, turn off the water, soap up and scrub, then turn the water on and rinse off. Repeat if necessary. There are no water police, but we all have an interest in enough water being available.
Although the food has looked great, I have found that until I get my ‘sea legs’ I need to stay away from most food. Yesterday evening, I discovered that the lunch and dinner I ate; did not look as good coming out as it did going down. Today is better, but I will stick to yogurt, oatmeal, and tea for a bit.
Animals Sighted Today
Sea nettle jellies Chrysaora fuscescens
Moon jellies Aurelia aurita
Egg yolk jellies Phacellophora camtschatica
Ocean sunfish Mole mole
Humpback whale Megapterea novaeangliae
Blue whale Balaenoptera musculus
Common murre Uria aalge
Black phoebe Sayornis nigricans
Red phalarope Phalaropus fulicaria
Buller’s shearwater Puffinus bulleri
Sooty shearwater Puffinus griseus
Brown pelican Pelecanus occidentalis
Brandt’s cormorant Phalacrocorax penicillatus
Dall’s porpoise Phocoenoides dalli
Questions of the Day
- What type of data is considered ‘oceanographic’ data?
- What types of organisms produce chlorophyll in the ocean?
