A good diving platform with a lot of room makes life much easier, especially when many people, all doing different things, are on board. Moss Landing’s Baja Spring 2011 class had connections with people living in Bahia Concepcion and were able to use a panga, pronounced ponga, to get around among the islands. This boat had about 2-3 feet of draft, how deep the boat sinks into the water, and at high tide the boat could go all the way up to shore. This is much easier on the back when moving heavy SCUBA cylinders!
Posts Tagged ‘boats’
Unfortunately for many marine mammals, vessels running on the water may not see the animals near the surface, and will collide with them. If you are on the water make sure to have many people viewing the water for any obstacles and wear polarized glasses to reduce the glare! The mammals swimming around will greatly appreciate it, like this Humpback whale shown here with damage to its fluke. We are all trying to use the ocean together!
This leatherback sea turtle wont actually be going anywhere. It’s part of the MLML Marine Ops Open House display! You’re looking into the bow of the Sheila B., one of MLML’s research vessels. The bow of the Sheila B. is a door that can drop down, a great feature for capturing leatherback sea turtles and bringing them aboard for research purposes.
Be sure to come on by Open House this year to see what Marine Ops has in store for you.
Just like a space rover, this instrument is designed to help us study places that are inhospitable to people. But rather than the furthest reaches of space, this corer travels to the depths of the sea to where it collects cores of the mud and sand on the ocean floor. Geological oceanographers like MLML professor Ivan Aiello (left) can use the samples to learn how different geologic features in an area formed throughout history – in this case, the study site is Monterey Bay.
Recent MLML graduate and Drop-In contributor Amanda Kahn poses next to an instrument called a CTD on the deck of the Research Vessel Point Sur. “CTD” stands for Conductivity (or salinity), Temperature and Depth – all properties that the nifty gizmo can record as it’s lowered and raised through the water. The black cylinders are called niskin bottles, and they can be opened and closed to collect a sample of seawater at specific depths. Niskin bottles and other oceanographic equipment snag the spotlight in the mother of all marine science music parodies, “Cruise Cruise Baby” – check it out!
MLML graduate Heather Hawk uses her muscles and puts some oomph into bringing in the catch. Just another day in class at Moss Landing Marine Labs.
It doesn’t look like these folks from MLML will be running into any rush hour traffic. They are out on the bay in an inflatable as part of a class field trip. Trips into the field are just one of many ways MLML students get actively involved in research for classes.
Each year, humpback whales migrate between their feeding areas in high-latitude places such as Alaska, California and Antarctica to their breeding areas in more tropical regions such as Mexico, Hawaii, Central America, and the South Pacific. This means that during the winter, all of the animals should be in the breeding area and none should be in the feeding area. It turns out that this isn’t true. All around the world, people have seen humpback whales in feeding areas during the winter when they are expected to be in the breeding area. This leads to the following questions: Who are these animals that spend their winters in the feeding area? Are they mostly males? Females? Juvenile animals? Why would they give up their chance to reproduce for the year?
It was these questions that led me to choose my project. For my master’s thesis at Moss Landing Marine Labs, I will attempt to answer at least some of them. To do this, I will look at the animals off the coast of central California, an important feeding area for humpback whales that breed off the coast of Central America. I will be looking at the sex-ratio (the number of males present compared to the number of females present) and the proportion of juvenile animals (the number of young animals compared to the number of adult animals) in this area throughout the year. By seeing how the sex-ratio and the proportion of juvenile animals change from summer to winter, I will be able to determine who is using the area in the winter. For example, if the sex-ratio is 1:1 in the summer (1 male present for every 1 female present) and 1:2 in the winter (1 male present for every 2 females present), I will know that there are more females than males using this area in the winter.
The different sexes and age groups of humpback whales are known to migrate to the breeding area at different times. Adult males are the first to begin the migration to the breeding area, followed by non-pregnant females, juvenile animals and finally pregnant females. This pattern would suggest that female animals in the late-stages of pregnancy remain in the feeding area longer than most other whales. This theory is supported by observations from the feeding area and during migration, but it has never been confirmed that pregnant females remain in the feeding area longer than most other members of the population. I will test this theory by determining the pregnancy rates of females found in the feeding area in the late fall and early winter. If a greater proportion of these females are pregnant than would be expected, this theory would be confirmed. The identification of this area as critical habitat for these pregnant whales would have profound implications for their conservation and management.
Stay tuned to find out how I find the whales, and then collect samples with a crossbow!