Lake of Dreams: The Remaking of Tennessee's Gray Quarry

Gray Quarry, Tennesee, USA. Photo by Gordon Hutchinson
Gray Quarry, Tennesee, USA. Photo by Gordon Hutchinson

Avid diver and professor of computing Dr. Phil Pfeiffer gives an account of how the love of diving, persistence, US$100,000, and a homebrew aerator turned an abandoned quarry in the US state of Tennessee into a thriving dive site for a region that lacked one—and had lost prospective divers for want of a site.

Wisconsin Historical Society archaeologists, assisted by divers from the Dane County Sheriff's Office, recovered the historic canoe from Lake Mendota on November 2, 2021
Wisconsin Historical Society archaeologists, assisted by divers from the Dane County Sheriff's Office, recovered the historic canoe from Lake Mendota on November 2, 2021

1,200-year-old canoe found in Wisconsin lake

Wisconsin Historical Society maritime archaeologists recovered a historic dugout wood canoe from the bottom of Lake Mendota in the US state of Wisconsin yesterday, just a few months after learning of its existence in June 2021. The canoe is a remarkable artifact, made from a single tree.

A new approach to enhance coral resilience comprise of selective sexual propagation, coral probiotics and environmental hardening, to enhance coral’s stress resilience and allow reefs to regrow under changed environmental conditions.
A new approach to enhance coral resilience comprise of selective sexual propagation, coral probiotics and environmental hardening, to enhance coral’s stress resilience and allow reefs to regrow under changed environmental conditions.

Restoring coral to health

Corals are able to respond to changes in their environment through acclimation (the physiological process of becoming accustomed to a new condition) and adaptation and researchers believe natural populations may already be adapting to increasing sea surface temperatures.

A deeper understanding of how coral holobionts (the coral animal together with its associated algae, bacteria and viruses) respond or adapt to stress provides opportunities to modify these responses, using the same mechanisms that corals have naturally evolved to survive stress.

A young coral colony (Acropora recruit) on the surface of a reef on the Great Barrier Reef.
A young coral colony (Acropora recruit) on the surface of a reef on the Great Barrier Reef.

Recovery of coral reefs

Understanding the recovery dynamics of corals is paramount to enabling the effective management of coral reefs. While detailed mechanistic models provide insight into reef recovery patterns, colony scale monitoring is not viable for reefs over a large geographical extent, such as the Great Barrier Reef (GBR).