Why are sea stacks important for nesting seabirds?

Sea stacks are steep coastal rock pillars formed by the progressive wave erosion of headlands. Because of their isolated and vertical nature, these rock formations provide critical, predator-free environments where colonial seabirds can safely nest, breed, and raise their chicks. Many notable stacks around the world support massive populations of nesting birds, playing an essential role in marine avian ecology.

What we know

• Coastal sea stacks provide critical predator-free nesting sites for seabirds. [2]
• Sea stacks form over time as coastal headlands are progressively eroded by hydraulic action and abrasion from wind and water. [2]
• Islets and sea stacks off Easter Island, including Motu Nui and Motu Kao Kao, support thriving seabird populations. [4]
• Large seabird colonies, such as northern gannets, frequently establish breeding sites on steep offshore islands and rocky stacks. [5]

Where to go next

• how it workedHow do waves and wind erode headlands to form stacks?
• a case in pointWhat are the most famous sea stacks in Scotland?
• how we knowHow did the bird-man cult use Motu Nui for nesting seabird eggs?
• compared withWhat makes northern gannets choose offshore rock colonies?
• the bigger pictureWhat is a coastal headland?
• an unexpected connectionHow did retrieving a seabird egg from a volcanic islet decide a religious leader?The isolated volcanic islets used by nesting seabirds were central to a historical competition where competitors risked shark attacks to collect the first sooty tern egg and rule Easter Island.

Sources

• [1]stack (Wikidata Q747957) · CC0 1.0
• [2]Stack (geology) · CC BY-SA 4.0
• [3]List of sea stacks in Scotland · CC BY-SA 4.0
• [4]Motu Nui · CC BY-SA 4.0
• [5]Northern gannet · CC BY-SA 4.0

Your path

1. What is the Gutenberg discontinuity?
2. /Why are sea stacks important for nesting seabirds?