Temperature Conditions in Artificial Sea Turtle Nests: Toward Optimized Hatchery Management

Area of Science:

• Marine Biology
• Conservation Science
• Climate Change Ecology

Background:

• Climate change threatens species with temperature-dependent sex determination, like sea turtles.
• Pacific coast of Guatemala's sea turtle populations heavily rely on artificial nest hatcheries due to low natural hatching success.
• Limited research exists on nest temperature monitoring and management factors in these crucial artificial incubation settings.

Purpose of the Study:

• To investigate factors influencing temperature variation in Olive Ridley Sea Turtle (Lepidochelys olivacea) nests within artificial hatcheries.
• To assess the impact of proximity to hatchery walls, egg numbers, nest position, development period, season, and weather on nest temperatures.
• To provide data for improving artificial nest management and hatchery design for sea turtle conservation.

Main Methods:

• Monitored temperatures in Olive Ridley Sea Turtle nests under various environmental and management conditions.
• Analyzed the influence of distance to hatchery walls, clutch size, nest position, incubation duration, season, and weather.
• Compared ex situ incubation temperatures with potential in situ conditions.

Main Results:

• Nest temperatures were generally within viable ranges, with pivotal temperatures exceeded 6%-21% of the time.
• Nests closer to concrete hatchery walls were up to 1°C warmer.
• Increased egg numbers (30-40 per nest) raised average temperatures by 0.7°C; sex ratios were slightly female-biased.

Conclusions:

• Distance to hatchery walls and egg density are manageable factors influencing nest temperature and sex ratios in Olive Ridley Sea Turtles.
• Careful hatchery management is essential to mitigate climate change impacts and avoid detrimental overcompensation.
• Ex situ incubation may reduce population adaptability, highlighting the need for balanced conservation strategies.