What it costs a turtle hatchling to dash to seaDecember 12th, 2008 - 5:18 pm ICT by IANS
Sydney, Dec 12 (IANS) A turtle hatchling’s first swim is the most critical of its life. Having run the gauntlet of air and land predators to make it to the sea, the tiny voyager must also evade hungry fish patrolling the beaches in its bid for freedom. For youngsters hatching on the Great Barrier Reef’s coral cays, the risks are high. As many as 30 out of a 100 perish as they head for safe deep waters.
But how much does this headlong dash through the waves cost the intrepid hatchlings?
Curious to know, David Booth from the University of Queensland decided to measure hatchling turtles’ oxygen consumption rates as they swam for safety.
Travelling north to the university’s research station on Heron Island, Booth was fortunate enough to have a lab within metres of a green turtle nesting beach.
Visiting the beach as the mothers-to-be lumbered up on to the sand, Booth was able to collect several clutches of eggs and move them to the edge of the nesting site for safety from other egg-laying mothers.
Returning to the site several months later as the eggs were about to hatch, Booth intercepted several youngsters before they reached the sea.
Transporting them 100 metres up the beach to the research station, he fitted each hatchling with a lycra swim suit with a cord attached to a force transducer before setting the youngster free in a seawater aquarium.
As soon as they entered the water, the youngsters began swimming frantically with their large front flippers, pulling against the force transducer as if they were swimming out to sea, according to a Queensland release.
Meanwhile, Booth measured the youngsters’ oxygen consumption as they swam for 18 hours to find out how hard they were working.
Watching the youngsters’ swimming style, Booth could see that initially the animals swam very hard using their front flippers with their heads down, only switching to a ‘doggy paddle’ as they came up for air before returning to frenzied front-flipper swimming.
But as time drew on, the youngsters’ activity slowed. They spent more time doggy paddling and less time pulling with their front flippers until they eventually began taking the odd break after about 12 hours.
Analysing the hatchlings’ oxygen consumption, Booth found the same trend with oxygen consumption falling rapidly during the first half hour before declining more slowly and eventually levelling off after 12 hours. So what does this mean for a young turtle as it thrashes to safety?
Calculating the amount of energy that the hatchlings consumed during their 18-hour-swim, Booth realised that the turtles carry almost 10 times as much energy in their yolk remnants as they needed to reach safety.
So the youngsters aren’t at risk of running out of energy before making it to safety and Booth suspects that they can probably survive 14 days in the open ocean before finding food.
These findings were published Friday in The Journal of Experimental Biology.
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