How do male dragonflies defend territories near water?

Male dragonflies defend territories near water to secure mating opportunities, with the intensity of this behavior varying by species. When males arrive at a mating rendezvous, they space themselves along the shore or over the water and establish specific areas that they actively defend.1

The defense process typically involves the following behaviors:

• Perching and Patrolling: Actively defending males often return to the same perch for many consecutive days to monitor their territory.1
• Intimidation and Aggression: When an intruder of the same species enters a territory, the resident male acts aggressively. This frequently leads to aerial agility contests, ensuring that territories are held by the most vigorous males.1
• Confrontation: These territorial disputes can be violent, occasionally resulting in injury or death for the rivals.1
• Guarding: After mating, a male may continue to guard the female by hovering nearby and darting at other males that approach, which helps ensure his sperm fertilizes the eggs.1

Through these actions, males compete for the best sites to attract females and successfully pass on their genes.1