Biosphere Expeditions: blogs from the frontline of wildlife conservation & the fight for a more sustainable planet

The last few days of the expedition have been busy! Teams from the night patrols have been bringing eggs back to the hatchery every night. Rosalyn and Frank encountered a turtle with missing back flippers “We had to help her dig the nest” says Rosalyn, “they have apparently encountered her before and her nickname is stumpy.” Leatherback turtles come ashore to lay eggs six to eleven times in a season, but only nest approximately every three years.

“It was magical to watch turtles emerge from the waves and then to see how delicately they use their back flippers to dig a nest” says expeditioner Lindsay. And further “its a real thrill to be there when the eggs drop into the bag for us to take them away to bury them safely in the hatchery. I am so happy, I can’t stop smiling”.

However, we also experienced nests being taken by poachers One tried to dig out a nest that was really close to sea. “He was trying to prevent water entering the nest” describes Neil. But it is not all bad news, because the coast guard arrived and arrested three poachers and gave us the eggs from two poached nests. “This is a big win all around as it not only means we can hatch poached nests, but it also send a message to other poachers that the coast guard does patrol this beach” says expedition scientist Fabian from LAST.

During our time at the LAST research station our team of Biosphere Expeditions citizen scientists put in 60 hours of patrolling the beach and 30 hours guarding the hatchery. During our time here, 18 nests were saved, totalling 1397 eggs. Eight nest were poached, however, the arrests made by the coast guard brought that number down to six and raised our nests saved to 20, resulting in approximately 25% of nests being poached. This is a significant improvement on last year’s 50% poaching rate and a win for conservation.

We could not do this without our citizen scientist volunteers putting in the time and effort, so thank you very much everyone. It was a joy to lead this expedition and I look forward to meeting many of you again sometime, somewhere on our planet, which needs all the help with wildlife and wilderness conservation it can get.

All the evening patrols are going smoothly. Our expeditioners have now split into smaller groups to search for nesting turtles during the 4-6 hour walks on the beach each night, in a race to retrieve turtle eggs before the poachers. Eggs retrieved from the beach are brought to the hatchery and we have been taking 4 hour shifts guarding the hatchery each night too. 40 nests of eggs have been re-buried already. Those on hatchery duty check every 20 minutes with their red head lamps to see if any baby turtles are emerging or if there are any ants or crabs around to threaten the eggs. For example, Valeria and Lindsay were handed a bag of eggs during their shift. They promptly re-buried them. “We took turns. First Lindsay dug the hole, then I placed the eggs in and finally we covered them together. As soon as we were done we really wanted to do it again”, said Valeria, our Costa Rican placement on the team.
Each year, the hatchery is constructed using sand from the beach under the high tide water line. This ensures the baby turtles grow in sand free of bacteria from the previous season (the salt water sterilizes the sand). Armed with shovels, buckets and wheelbarrows the Biosphere Expeditions team made quick work of transporting sterile sand from the lower beach up to the hatchery where it sits on an elevated plateau to ensure protection from storms. Others raked and stamped down the new sand into a perfectly flat area. To protect the border of the hatchery, we also constructed a chain-link fence with Eilith and Neil hammering it in place to posts constructed from tree trunks and branches. The team worked so well together that it only took two days to construct the hatechery with a perfect grid space for 500 new nests, each marked with cute turtle-shaped tags. “I really enjoyed sweating like a trooper, moving the sand and hammering the fence into place”, says Neil, now on his seventh (!) expedition. “It was good to work as a team, getting so much done in a relatively short time.”

The night time patrols mean we only catch a few hours of sleep each night, making the hammocks a popular spot for more sleep during the day, when we are largely off duty. Firday night there was a lot of turtle activity, with false crawls all over the beach. But only three turtles actually laid eggs with two clutches taken to the hatchery. “It was extraordinary, she went ballistic”, said Helen from South Africa who witnessed a turtle camouflaging her nest after she had laid her eggs..

One of the clutches was collected by myself (Lucy), Fabian and Valeria. This gave me the opportunity to trial the thermal camera that we are testing out to aid in the detection of turtles on the beach. We have been lucky with a full moon this week, but during a new moon the turtles coming out of the sea are very hard to spot. The camera was able to detect the turtle from about 30 meters away, showing up as a red blob on the screen. When used close up, it was obvious that the warmest part of the turtle was its back flippers, and once laid, also the eggs. The camera also detected a poacher with a dog, he was only 10 minutes ahead of us, so it was very lucky we spotted the turtle first. All up she laid 68 eggs and they are now safe in their new home in the hatchery.

Our group of excited expedition members arrived at the Pacuare field station on Monday after travelling by bus and boat from San José. We all got straight into the scientific training and Fabian taught us how to collect turtle eggs, measure an adult leatherback turtle and the skills necessary to get the eggs to the hatchery where they will be placed in a new human-made nest and kept safe from lurking poachers and predators.

Armed with our new skill set we went on patrol the first evening, walking the beach looking for nesting turtles. The late night team, patrolling from 23:00 to 04:00, struck gold and encountered two turtles. One false crawl, where the turtle came out of the sea to have look, but changed its mind and went back to sea without laying any eggs. The second turtle they encountered had just finished laying her eggs. Fabian, Eilidh and Valeria measured the new mama turtle – her shell was 143 cm long, and she laid 73 eggs that they had to dig out and then carry to the hatchery. “The eggs were so heavy” said Eilidh from Scotland. It is no small feat to carry that many eggs through soft sand in the dead of night for several kilometers. Brilliant work!

Today (Tuesday) Fabian trained us in leatherback turtle nest building, so that we can also be put on hatchery duty and help get the eggs into their new homes. It is hard work to dig a 75 cm deep nest in the sand, and after our training we were all covered in sand, top to toe. A splash in the sea, however, quickly took care of that problem. Everyone is excited to get back out on patrol tonight, hoping for more turtles!