There is concern recent wild weather events have damaged some seagrass beds in the Great Barrier Reef.
After two floods in two years, seagrass beds in central Queensland have taken a beating and that is bad for green turtles.
Heron Island tourist guide Hannah Jones says seagrass beds that were recovering from floods in 2011 may have been damaged further by recent events.
"The Queensland floods have washed a lot of sediment off the mainland onto the seagrass beds off the coast which is mainly what the green turtles would eat," she said.
She says the effects could be felt for years.
"This is potentially going to cause a prolonged shortage in the turtles coming to breed," she said.
"We still are seeing the turtles breeding but just not in the regular numbers we would see on a good year."
However, tourists are still flocking to the island to catch a glimpse of the egg-laying females.
© ABC 2013
16:10 EST It's the possible double whammy of flood damage and the mysterious disease, yellow canopy syndrome, that are really worrying cane growers in North Queensland.