Sex allocation theory aids species conservation

Area of Science:

• Conservation Biology
• Evolutionary Ecology
• Animal Behavior

Background:

• Supplementary feeding is a common conservation tool for threatened and captive species, often improving survival and breeding rates.
• However, supplementary feeding can have unintended negative consequences, such as biased offspring sex ratios, potentially increasing extinction risk.
• Kakapo (Strigops habroptilus) conservation efforts using supplementary feeding led to a highly male-biased chick sex ratio, posing a conservation dilemma.

Purpose of the Study:

• To investigate the impact of supplementary feeding on kakapo chick sex ratios.
• To apply sex allocation theory to address and remedy the conservation challenge of skewed sex ratios in kakapo.
• To demonstrate the first manipulation of offspring sex ratios in an endangered species through modification of maternal condition.

Main Methods:

• Altering maternal nutritional condition through controlled supplementary feeding regimes.
• Monitoring and analyzing resulting chick sex ratios.
• Integrating principles of evolutionary sex allocation theory into conservation management strategies.

Main Results:

• The study successfully manipulated kakapo chick sex ratios by adjusting maternal condition.
• This intervention demonstrated a practical application of sex allocation theory in a real-world conservation scenario.
• The findings provide a method to counteract undesirable side effects of supplementary feeding in endangered species management.

Conclusions:

• Incorporating evolutionary theory, specifically sex allocation theory, is crucial for effective conservation of endangered species.
• Manipulating maternal condition offers a novel approach to managing offspring sex ratios in conservation programs.
• This research highlights the importance of considering evolutionary principles to avoid unintended negative consequences of conservation interventions like supplementary feeding.