Deep coral habitats of Glacier Bay National Park and Preserve, Alaska

Research in Glacier Bay National Park and Preserve, Alaska, reveals a distinct gradient in deep coral community diversity, driven by glacial influence. Coral diversity is highest at the mouths of fjords and in the Central Channel, where low sedimentation and strong tidal currents prevail, while species richness declines near glaciated heads due to higher sedimentation and harsher conditions. The study used remotely operated vehicle (ROV) surveys with photo-quadrats to analyze ten sites across depth gradients (100–420 meters), capturing environmental data via onboard CTD sensors. Dominant species varied significantly, with large colonies of Primnoa pacifica and diverse marine life thriving in less glacial-influenced areas, while pioneering species like Sarcodyction incrustans dominated near glaciers. This gradient is attributed to physical factors such as sedimentation and nutrient availability, alongside biological processes like larval dispersal.

Hartill, É. C., Waller, R. G., & Auster, P. J. (2020). Deep coral habitats of Glacier Bay National Park and Preserve, Alaska. Plos One, 15(8), e0236945. https://doi.org/10.1371/journal.pone.0236945