The remote Galápagos archipelago has yielded a sobering glimpse into the plight of critically endangered scalloped hammerhead sharks, as well as the far-reaching consequences of climate change on marine ecosystems. A two-week expedition to the Darwin and Wolf Islands in March offered scientists from the Charles Darwin Foundation an unparalleled opportunity to study these majestic creatures up close, amidst a kaleidoscope of oceanic changes.
Located approximately 1,000 kilometres off the coast of Ecuador, the Darwin and Wolf Islands are a hotspot for marine biodiversity. During the expedition, a team of researchers lived at sea on a 22-metre diving yacht, conducting daily operations that included scuba diving, freediving, and deploying underwater cameras. The resulting encounters with wildlife were nothing short of breathtaking – from majestic green sea turtles and playful sea lions to flocks of seabirds.
The primary focus of the trip was to observe the epic migrations of scalloped hammerhead sharks, which congregate in vast numbers around Darwin and Wolf Islands. Pregnant females of this critically endangered species travel distances exceeding 1,000 kilometres to give birth in the mangrove forests of Panama – a perilous journey that underscores their precarious existence.
But the research team's gaze was not solely fixed on the hammerheads. They were also monitoring the wider marine ecosystem, systematically deploying underwater cameras and tracking every fish species in their midst. Ecuadorian marine biologist Katherine Rezabala is responsible for analysing the vast amounts of video footage collected during the expedition – a painstaking task that requires meticulous attention to detail.
The Galápagos Islands are notorious for their turbulent waters, where warm and cold currents intermingle. However, larger forces are now at play, significantly altering these conditions. Forecasts indicate a strong El Niño event is likely to return this year – the fourth such major event since the 1980s. This phenomenon would bring warmer waters, diminishing the upwelling currents that deliver vital nutrients and potentially leading to widespread mortality among ocean life.
The Charles Darwin Foundation team is scheduled to return to Darwin and Wolf Islands in September to assess the immediate impacts of these environmental shifts on the hammerhead sharks and broader marine community. This ongoing research highlights the critical need for sustained observation and conservation efforts in the face of rapidly changing global ocean environments – a warning bell that resonates particularly strongly with British policymakers, who must navigate the complexities of climate change's impact on UK trade, travel, and security.