Mission Bay in San Diego has become a vital habitat for several endangered bird species, including the California Least Tern and Ridgway's Rail.

The area's remaining tidal wetlands provide critical nesting and foraging grounds, but these habitats are under threat from human activities and environmental changes.

Recent efforts to protect and restore these areas are crucial for the survival of these species.

A Haven for Endangered Birds

The Kendall-Frost Mission Bay Marsh Reserve has become a sanctuary for the endangered Ridgway's Rail. These birds, raised in captivity at the Living Coast Discovery Center, have been released into the wetlands to bolster the population.

According to the San Diego Audubon Society, the marsh once spanned 4,000 acres but now only 1% remains. This drastic reduction highlights the importance of ongoing conservation efforts.

Andrew Meyer of the San Diego Audubon Society emphasizes the significance of the marsh for these birds, stating, "If you are an endangered Ridgway's Rail, you like and need this habitat."

The reserve's restoration aims to increase the population of these birds, with a goal of establishing 800 breeding pairs statewide.

 

The Role of 'Bowling Pin' Island

Another critical area in Mission Bay is the human-made "bowling pin" island, also known as FAA Island. This site not only serves as a navigational aid for aircraft but also provides essential nesting grounds for the endangered California Least Tern. The island's recent 20-year lease renewal ensures continued protection for these birds, especially during the nesting season, The San Diego Union-Tribune reports.

Meyer notes that predators and climate change are major threats to the tern population, which has decreased by half in the last 15 years. The island's environmental resources are co-managed by the Audubon Society and the U.S. Fish and Wildlife Service, who conduct regular visits to monitor and maintain the habitat.

The recent upgrades, including new bird spikes and nesting structures, aim to enhance the protection of these vulnerable species.

 

Human Disturbance and Its Impact

Human activities in Mission Bay, such as boating and fireworks, pose significant threats to nesting birds. The California Least Tern, in particular, has faced disturbances that have led to dead adults, chicks, and eggs washing up on the shores.

The San Diego Audubon Society has expressed deep concern over these impacts and is calling for immediate action from the city and the California Coastal Commission. The issue of fireworks is especially pressing, as the San Diego Bayfair event coincides with the breeding season of the Least Tern, reports the Voice of San Diego.

The Audubon Society has urged the city to postpone the event to prevent further disturbances. Studies have shown that such disturbances can lead to increased energy expenditure in birds, reduced feeding time, and even nest abandonment. Establishing protective buffers and stricter regulations on human activities near nesting sites are crucial steps to mitigate these impacts.

 

Recent Vandalism and Ongoing Challenges

In a recent and troubling event reported by NBC San Diego, vandals targeted a sanctuary for endangered birds at Mariners Point, destroying equipment and damaging nesting structures. Meyer described this as the most significant vandalism incident the sanctuary has experienced.

While no birds were harmed, the incident underscores the vulnerability of these habitats and the need for increased protection and public awareness. Efforts to restore and protect these habitats are ongoing, but challenges remain.

The nesting success of the California Least Tern and other species depends heavily on the availability of undisturbed habitats. As development pressures and recreational activities increase, the need for proactive conservation measures becomes even more critical.

The continued protection and restoration of critical habitats will not only benefit the birds but also contribute to the ecological health and resilience of the region.

Click below to take action for the nesting birds in Mission Bay.