By Annabel Payne, Macquarie University
We’re back! Well, we’re in Fremantle, Western Australia. The past two weeks have flown by, and it feels strange that now it’s all over and we’ll be heading home to our respective cities. Meeting new friends and learning new skills, I think I can safely say we all had an amazing experience.
I’ve been to sea before, but this was my first time learning about plankton collection, identifying different climate events from microfossils, counting different birds and mammals, understanding CTD measurements… the list goes on! CAPSTAN has been a brilliant learning experience and if you’re thinking about applying for next year, definitely do!
I decided to work in the wet/dirty sediment lab because I felt like it might complement the work I’ve been doing at university. I’ve been looking at how changes in sediment provenance influence Neodymium, an isotope usually used to track changes in past ocean circulation. A lot of the age models used are derived from oxygen isotopes in foraminifera. Since we had Stephen onboard, our foram expert from Melbourne, it seemed like the perfect opportunity to learn as much as I could. I now know the importance of a certain species for identifying the last glacial maximum in sediment cores from the Southern Ocean, how changes in size and species distribution are influenced by temperature and light!
My particular mini project while at sea involved sieving samples from the top and bottom of the cores, separating the different fractions out to see how grain size distribution varied down the canyon we were targeting. In these samples we found a huge variety of forams – some look like popcorn, others look like christmas baubles, and others were perfect spheres. The variety of forms within such a small sample gave me a huge appreciation for just how diverse life is at a microscopic scale.
The same could be said for in the plankton lab. The tiny jellyfish, starfish, copepods and various other little critters were fascinating, it was certainly a novel experience being able to see what I’m studying for a change!
From the science to dressing up as sea creatures and trivia, we had a great time. Maddie kept us all singing with showtunes, Sian’s whale calls (which may have something to do with the lack of cetaceans – sorry Sian!), movie nights, through to the excellent food and expert crew. A trip on the RV Investigator is one to remember.