Turtles Nest Earlier, Lay Fewer Eggs as Climate Reshapes Reproduction
Long-term research on sea turtle populations, particularly loggerheads in Cabo Verde and green turtles in Cyprus, reveals a significant shift in reproductive behavior driven by climate change. Scientists have documented that turtles are now nesting earlier in the year, a behavioral adaptation believed to help offset the negative effects of rising incubation temperatures on their eggs. This earlier nesting, influenced by warmer sea temperatures, breeding experience, and the number of clutches laid, offers a potentially positive outlook for hatchling success. However, this shift in timing masks more profound threats. A comprehensive 17-year study indicates that while nesting starts sooner, the overall reproductive output is declining. Warmer ocean temperatures are causing a decrease in the turtles' food supply, as indicated by satellite estimates of chlorophyll. This forces females to remain longer in feeding areas to build the necessary energy reserves, a critical process for 'capital breeders' like loggerheads who rely on stored energy to reproduce. Consequently, turtles are breeding less frequently, with some studies suggesting only half as often. The combination of environmental stressors is leading to a reduction in the physical size of the turtles. Smaller females produce smaller clutch sizes, compounding the reproductive challenges. Researchers emphasize that while beach-level data showing more nests and earlier activity may appear to be a conservation success, the individual turtles' struggles reveal a more complex and alarming picture. The findings highlight a critical trade-off between environmental conditions and reproductive investment, underscoring the multifaceted ways climate change is reshaping the life cycle of these ancient mariners.
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Satellite estimates of chlorophyll found that food supply is dwindling in the ocean. And these turtles being “capital breeders”, draw from energy stored from foraging at sea, over years, in order to reproduce. The authors found that warmer years were associated with earlier reproductive ...
Females now remain longer in feeding ... to breed. “From the beach, everything is a conservation success – more nests, earlier nesting, lots of activity,” said Kirsten Fairweather, co-lead author and scientific coordinator at Associação Projeto Biodiversidade. “But when you follow individual turtles over many ...
SEE ALL NEWSLETTERS Children Elections ... Search for topics, people, articles... India World Movies Sport Data Health Opinion Science Entertainment Premium ... Scientists noticed that loggerhead turtles are getting smaller in size, reducing their reproductive output: smaller females produce smaller clutch sizes. | Photo Credit: Brian Gratwicke (CC BY) The spectre of climate change ...
Climate change is forcing sea turtles to nest earlier each year - Oceanographic
Sea turtles are responding to climate change by nesting earlier in the year in a move to compensate for rising temperatures, researchers monitoring the breeding habits of green and loggerhead turtles in Cyprus have discovered.
Along with temperatures, breeding experience and number of clutches laid in a year equally influenced the timing of nesting. Other studies suggest that the earlier egg-laying seen now in some turtle species seems to be enough to offset the effects of warming temperatures on the eggs. “This gives them a much better outlook in the face of climate change,” Rickwood says. ... Subscribers, enter your e-mail address for full access to the Science News ...
The researchers also examined interactions between chlorophyll-a levels, sea surface temperature and turtle body size. The results indicate a trade-off between environmental conditions and reproductive investment, highlighting the complex ways climate change influences marine species.
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