Split spawning increases robustness of coral larval supply and inter-reef connectivity

Area of Science:

• Marine Biology
• Coral Reef Ecology
• Reproductive Strategies

Background:

• Corals often engage in mass synchronous spawning, producing numerous larvae.
• Larval dispersal is heavily influenced by unpredictable ocean currents, impacting supply reliability.
• Some coral populations exhibit split spawning events over successive months.

Purpose of the Study:

• To investigate the ecological benefits of split spawning events in corals.
• To determine if split spawning enhances larval supply reliability and diversity.
• To model larval dispersal patterns across Australia's Great Barrier Reef.

Main Methods:

• Utilized ecological modeling to simulate coral larval dispersal.
• Focused on the Great Barrier Reef to analyze connectivity patterns.
• Compared larval supply outcomes between single and split spawning events.

Main Results:

• Split spawning significantly increased the diversity of larval sources for recipient reefs.
• Larval supply reliability was enhanced, particularly in regions with low and variable connectivity.
• The model indicated potential benefits for reproductive success despite split spawning.

Conclusions:

• Split spawning events can be a beneficial reproductive strategy for corals.
• This strategy improves larval supply resilience against oceanographic variability.
• Split spawning may be crucial for maintaining coral reef health and connectivity.