marine science

Back working with the Giant Petrels by Jerry Gillham

Working with the giant petrels was my favourite part of the job on Bird Island. Now I'm management and there's not so many of them nesting in the vicinity of King Edward Point it's rare I get to enjoy their aggressive / serene / maniacal / ridiculous behaviour. So when it got to the time of year for Kieran, the higher predator scientist, to go through their nesting grounds weighing and measuring the chicks I of course volunteered to help.

As well as getting up close with the birds it's a good excuse to get across to a a few less-well-travelled parts of the island.

Kieran approaching a giant petrel chick. Hopefully by this size and age they're past the point of vomiting to defend themselves, instead relying on their massive beak with which to bite you, but that's by no means a rule true to every bird. The trick is to approach and grab it quickly, minimising stress and ensuring minimal handling time.

Me in front of the Lyell glacier. These photos were taken at Harpon, a bay and hut over the other side of the peninsula from King Edward Point. It's about a two hour walk and the first time I'd been over that direction. It was also one of the first really snowy days we had though for most of it I wasn't as cold as I was here. Once down at sea level however we had the cold winds coming in off the ocean mixing with other cold winds coming down off the glacier.

With the boats in the water I was able to swap Kieran for Vicki (fisheries biologist) for the walk back. Away from the coast it warmed up again and as the sun dropped we got some great views down on the Lyell glacier. Normally this is all covered in debris, a dirty brown colour, but with a fresh fall of snow it looked dramatically white.

A sunnier day on the Greene Peninsula and I got hands-on with the birds again. I'm not putting any weight on the bird, merely using my legs to keep it still so I can measure the beak and then weigh it. These chicks aren't far off fledging and getting the weight of chicks at the same stage each year is a good indicator of the general health of the population, obviously in a summer of abundant food they'll be heavier and more likely to survive that first winter.

As with much of the work I used to do the predators at the top of the food chain are studied because it is a simple way of getting an idea of the health of the whole food web, but these measurements will only form a data point on a long term (decades-long) study into trends.

Bill measurements are used to determine sex with males having longer ones, in some cases over 100mm. 

Another day, a cold one again, heading out to the Greene Peninsula. It's only a short journey across by boat and up a fjord with a very shallow moraine entrance, so only suitable for the RHIB. The first job of the day was to get ashore and retrieve a VHF that one of the team had left on the beach the previous week.

Down the end of the fjord we took the opportunity to have a closer look at the Hamberg Glacier, unlike the Lyell which is large, dirty and sprawling through a valley this one is jagged, white, bleak and squeezed between a couple of rocky peaks.

 

Jerry

Science and Whales by Jerry

21st November

Travelling with us are a large number of marine scientists with a disparate array of equipment for sampling everything about the ocean. Probes and nets to measure temperature, salinity, currents and the abundance and biometrics of microscopic life. Far too much for me to explain here,

www.seaweeddownsouth.wordpress.com

 is a good start though.

Just before lunchtime on 21st we reached one of the sampling locations and paused to allow the scientists to do their thing. Getting a few bits together to go out on deck and observe I noticed, through my cabin window, a distant whale spurt. Outside we realised we were surrounded by them and as we waited, roughly stationary for about an hour, we got some amazing views of these humpbacks feeding all around the ship. Close enough to hear their exhalations, feeling like we could reach out and touch them. Truly thrilling, these photos and videos (

https://vimeo.com/148031681

) will sum it up better than I can.

Team talk before launching the net.

Harnessed up, standing at the very back of the ship ensuring a smooth launch.

Humpback whales!

Incredible views so close to the ship.

Pulling in a mooring buoy containing dozens of measuring devices.

Jerry