Why do scientists eavesdrop on whales and dolphins? What can recordings of whale and dolphin sounds tell us? How do you even record the sound that these creatures make? And what’s it like to go to Antarctica?
Join us on Saturday, May 25 at Te Papa for a FREE talk by NIWA scientists Dr Giacomo Giorli and Olivia Price to hear the answers!
As part of the build-up to Eavesdropping Underwater, we interviewed Olivia Price about her role as a Marine Physics Technician for NIWA.
Can you tell us a bit about your role at NIWA?
I work within a team of physical oceanography technicians to maintain, deploy and recover science equipment that records information about our oceans’ physical properties (i.e. temperature, salinity, oxygen). These properties can tell us a lot about ocean currents and features which provide food and the right kind of conditions for marine life to thrive.
You’re a Qualified PADI Dive Master. What does that entail? How deep have you dived?
I started with a PADI Open Water course in 2014 and have been hooked ever since! A Divemaster certification allows me to act as an assistant to a Dive Instructor and has taught me rescue diving skills. My Divemaster assessment was in Milford Sound, which was the best diving I have ever done! We dived alongside sheer underwater cliffs to 38m (PADI limits are 40m) and saw a very special black coral – that underwater looks white. These corals have been building their underwater forests in Milford for 200 million years.
You were part of a recent journey to the Antarctic onboard a NIWA research vessel. Can you tell us what living on board was like in those conditions?
NIWA’s flagship vessel, the Tangaroa is a multi-purpose research vessel designed to investigate New Zealand’s marine resources and environment. Inside the accommodation, you would never know you’re in Antarctica until you look out the window. It is toasty warm and the cooks aboard are known for their epic meals. With very limited internet/phone access and not seeing another ship for six weeks, it felt like our crew were completely isolated from the rest of the world. This isolation and extreme cold conditions meant we needed to prepare for any kind of emergency- so there was plenty of survival training before we left port and plenty of drills aboard. As we steamed south, each day got longer until we were experiencing 23 hours of daylight. Even then the sun didn’t fully set, instead skimming the horizon. This meant plenty of hours for whale watching and spotting icebergs!
As well as passive acoustic moorings, the “whale listening posts”, you also use physical oceanographic moorings & an ASL echosounder. Can you tell us the difference between these, what they measure and what you hope to achieve from the data recovered?
Passive acoustic moorings (PAM) take a bit of explaining, which will be easier to convey with pictures on Saturday. The physical oceanography moorings have a set of instrumentation on them recording physical properties (i.e. temperature, oxygen and salinity) that will help give an insight into how fresh water coming off the Ross Ice Shelf is interacting with our deep oceans. On the mooring is also some current meters that measure the strength and direction of water flow. The Ross Ice Shelf is particularly important as it is the largest freshwater reserve in Antarctica!
The ASL is an acoustic sounder that measures the amount of Antarctic krill in the water by sending and listening out for sound pings. These krill are a key food source for the Adelie Penguins that live on Cape Adare.
The voyage also focused on some of the tiniest organisms in the ocean – the phytoplankton and bacteria. Can you talk about how data on these is collected, and what it is for?
These amazing little organisms are collected using a CTD Rosette which has a bunch of bottles on it that allows us to collect water samples at different water depths. Several scientists worked hard to analyse phytoplankton and bacteria community structure across the Ross Sea. Although these organisms aren’t visible to our eyes, there are ridiculous amounts of them in the ocean and they are incredibly important. Phytoplankton produce around 70% of the air we breathe, I like to call them the humble trees of the ocean!
What was your favourite wildlife memory from your journey on the Tangaroa?
It is so hard to pick one as we saw a lot of beautiful animals! A moment I will never forget is when we reached the edge of the sea ice at dusk and saw multiple groups of Adelie penguins swimming and leaping into the ice for the night. I felt like I had jumped into a David Attenborough scene.
For more insights into Olivia’s work, join us at Eavesdropping Underwater: the Sounds of Whales and Dolphins on Saturday, May 25 at Te Papa!