A variety of Acropora corals at Lighthouse Reef in Palau where researchers from CSIRO, UQ and PICRC saw rapid coral recovery with the release of dormant coral “seed banks” after a super typhoon in 2012.

Corals store dormant 'seed banks' like forests do

Initially slow, the recovery puzzled scientists in the study, led by marine ecologist Dr Christopher Doropoulos and research co-lead Dr George Roff, together with team members from the University of Queensland and Palau International Coral Reef Center, who expected regeneration to follow traditional patterns, driven by coral spawning events. These events involve the synchronized release of eggs and sperm into the water, leading to the dispersal of coral larvae that settle onto impacted reefs.

Pairs & Companions: Contributors’ Picks

Photo by Anita George-Ares
Photo by Anita George-Ares. Thorny seahorses, Dumaguete, Philippines. Gear: Canon EOS Rebel SL1 camera, Canon EF-S 60mm f/2.8 macro USM lens, Ikelite housing, two Ikelite DS161 strobes. Exposure: ISO 200, f/11, 1/160s

We asked our contributors to share their favorite photos that show pairs and companions, or two of a kind, and they returned with a range of macro to wide-angle shots, featuring a variety of marine life large and small from around the world.

It’s a Gas, Gas, Gas… Nitrox in Sport Diving: How It All Began

Scuba diver on nitrox at Flower Garden Banks National Marine Sanctuary in the northwestern Gulf of Mexico. (Credit: G.P. Schmahl / NOAA / NOS / NMS/ CC BY 2.0 DEED)

This article is an abridged version of an early chapter in Simon Pridmore’s history of the early days of technical diving, Technically Speaking—Talks on Technical Diving, Volume 1: Genesis and Exodus. The nitrox saga would end up as the subject of vitriolic debate and bitter division in the sport diving community for half a decade. This is its origin story.