SnotBot Sea of Cortez: Part 2
The first leg of the SnotBot Sea of Cortez expedition was to San Ignacio lagoon, where the accessibility of grey whales gave us an opportunity to test a number of different snot sample collection techniques. After working with fairly social Southern right whales and very social grey whales, the work was about to get a lot harder. While we had developed a very successful sample collection platform with the DJI Inspire 1 during the first Leg, the question was could we collect snot from other species of less social whales such as humpback, blue & fin whales?
So after 5 productive days in San Ignacio Lagoon, we packed up our 16 bags and made the 12-hour drive to La Paz for Leg 2. I thought that this drive was going to be very boring with hours of endless desert. While we did have plenty of desert, the countryside was spectacular, driving along coastal roads in and out of low mountainous ranges. The scenery kept changing from desert to dry river beds where greenery was abundant and human agriculture evident. I have seen so much of Mexico from the sea so it was a real pleasure to have this terrestrial counterpoint.
We arrived in La Paz late on Friday night with a message from Dr. Jorge Urban that it would be too windy to go out on Saturday. As disappointed as we were to hear this, it did give us a day to organize our equipment, buy the items that we could not get in San Ignacio, and meet the film team, Adrienne & Tom, who had come to document our work for an out-of-house project (more about that later). It was also a luxury to have a real shower, plug our battery chargers into every socket in the room and connect to the Internet!!
Sunday morning we were up at 6:30 and on the boat by 8:00. Dr Urban (who I have known for over 20 years) from the University of La Paz was at the helm of his 22 ft panga, so we knew that if there were whales out there that we were with the best man in town to find them. Alas, Jorge had some bad news to share. The El Nino was wreaking havoc with the Sea of Cortez ecosystems, both marine and terrestrial, and his team were not seeing the typical patterns of whales or abundance – he had just postponed a satellite tagging project because of this. With those thoughts in mind, we headed out in the Bahia La Paz. Bounded by the Baja peninsular to the west and the islands of Espirito Santo and Partida to the east, Bahia La Paz extends almost 30 miles north from the city of La Paz and is on average 20 miles wide. These are (typically) very productive whale grounds, and as we spent our first day searching the bay we were regaled with stories of frequent past encounters with humpback, fin and blue whales and occasional encounters with orcas and sperm whales.
We covered over 100 sun-blistering miles the first day, stopping every hour to look and listen. Despite the optimal conditions we did not see a single blow. We returned to our hotel that night tired, sunburnt and a little disheartened. This is the business though, so the next morning we were in the panga by 7:30 and back out on the water. Today our guide was Iram, another seasoned biologist from Dr Urban’s team. Alas the day did not go much better; we did put our DJI drones to work, though, sending the Phantom 4 up to 380 feet every hour using it as an eye in the sky.
As effective as the Phantom 4 was in increasing our spotting range, we still did not see any blows, and by 4:30 in the afternoon the wind had picked up to 15-20 knots so we headed back in. We were quite close to the city of La Paz when we saw a blow and quickly identified it as a humpback whale. Typically in conditions this windy we would not try for a blow collection (above 15 knots the wind lays the blow down and the chances of more salt water in the blow increases). But considering that this was the first whale that we had seen in 3 days, we went for it. We had moderate success, but every now and then we took a wave over the bow of the boat. This was not good because we had a boat full of electronics, 3 drones and supporting equipment along with close 80K of camera equipment (Christian & Tom both had Red cameras). So we had to abandon the work and head back into port. As you can imagine, by this time I was really sweating it (and not because of the heat). We had a very successful first leg, but we needed to validate what we had learned with other species of whales. That night I called our logistics and expedition coordinator, John Atkinson (in Canada), to set up a spotter plane for the next day. We did not have a budget for a plane but we had to find whales. We set it up so that we would spend an hour and a half driving the panga out into the bay and then we would call the plane. Clearly the whale gods were on our side. Right when we were about to call the plane I heard Adrienne shout BLOW. Everyone leaped into action, and less than 20 minutes later we had our first humpback whale sample and it was spectacular – our petri dishes and the Inspire 1 were dripping with snot.
We stayed with this animal for the next few hours, keeping the panga away, but making a number of close approaches with the Inspire 1. Andy was timing the animal’s dives, which were running at about 9 min. Our procedure was as follows: at 8 min we would prep the Inspire 1; at 8 min 30 sec John Graham would launch the drone and I would hover above the boat ready to go. Once we saw a blow, my challenge was to get to the whale in time for the second blow. Once I saw the whale on the surface, I would race the drone towards it and then get into my FPV position (sometimes this would be very disorientating because I would have a drone’s eye view of the world but the boat would be bouncing out of sync with my view). The whale seemed to like Andy because once he shouted “Should be coming up any second now” and within 5 seconds the whale surfaced. Our drone and launch protocols, our practice as a team, our development of the collection methods all seemed to come together with great results, so we were living the SnotBot dream. Once when the whale was down Christian sent up his Inspire 1 to film our boat underway, next thing you know the Humpback breached in the frame with our boat in the picture—absolutely blooming amazing. We went home that night over the moon. Certainly we needed to test SnotBot with other whales, but it looked as if we had a winning formula, all of this work had been caught on camera by two remarkable cameramen, and we still had one day left on the water……. and OMG what a day that was! Ill report on our last day in my next blog.
Dr. Iain Kerr