Our most recent post about marine ecosystem citizen science connects the dots between the amazing community of people involved in gathering much needed information about the health of biodiversity in the deep.
Women’s photography of greater sea snake, once believed to be an anomaly in the Baie des Citrons, help scientists understand the ecosystem
A group of snorkelling grandmothers who swim up to 3km five days a week have uncovered a large population of venomous sea snakes in a bay in Noumea where scientists once believed they were rare.
Dr Claire Goiran from the University of New Caledonia and Professor Rick Shine from Australia’s Macquarie University were studying a small harmless species known as the turtle‐headed sea snake located in the Baie des Citrons, but would occasionally encounter the 1.5 metre-long venomous greater sea snake, also known as the olive-headed sea snake.
Goiran and Shine believed the greater sea snake was an anomaly in the popular swimming bay as it had only been spotted about six times over 15 years. From 2013, they decided to take a closer look at the greater sea snake to better understand its importance to the bay’s ecosystem.
“The study zone is in the most touristic bay in Noumea, so I often meet people when I am doing field work on sea snakes,” Goiran said. “When I was snorkelling on my own studying sea snakes, I used to meet a friend of mine called Aline that was snorkelling and taking photos on the same reef. In order to help me, she started taking photos of sea snakes and would send them to me by mail.
“I was very happy, so she asked her neighbour and friend Monique to help me too. Monique asked another friend, and soon there were seven grandmothers helping me.” The group named themselves “the fantastic grandmothers” and range in age from 60 to 75.
As the grandmothers sent photos through to Goiran and Shine, they realised they had vastly underestimated the population of greater sea snakes. Goiran and Shine have now published a paper in the journal Ecosphere revealing there are more than 250 greater sea snakes in the bay. Greater sea snakes have distinctive markings, allowing individuals to be easily identified from photographs.
“Even when I am stuck at university with teaching, I know what is going on in the study zone because the grandmas survey the zone for me and send me the photos,” Goiran said.
“Remarkably,” Shine added, “the grandmothers found a large number of lethally toxic sea snakes in a small bay that is occupied every day by hordes of local residents and cruise‐ship passengers – yet no bites by the species have ever been recorded at Baie des Citrons, testifying to their benevolent disposition.”
They said the findings mean the role the snakes play in the functioning of the ecosystem is more important than previously thought. Scientists believe the snakes likely play a role in nutrient cycling through coral reefs, but there is little research available.
Would this work have been possible without help from the citizen scientist grandmas?
“Of course not,” Goiran said. However it was hard to get all seven in the group going out at the same time, she said, because “there is always at least one away hiking, biking, sailing, taking yoga class or taking care of the grandkids”.
Read the entire article here.