An international team maps four unnamed underwater canyons, explores nearly 20 methane seep ecosystems thriving without sunlight, and uncovers a dazzling array of otherworldly creatures, including suspected new species.
PUNTA ARENAS, Chile – An international team of scientists on board a recent Schmidt Ocean Institute R/V Falkor (too) expedition surveyed nearly 20 methane seeps, some of which are new discoveries, and four submarine canyon systems previously never before seen by humans. They found an abundance of animals, including possibly 60 new species or more, living in surprisingly diverse ecosystems off the Chilean coast, including commercially valuable fish swimming in seep areas. The 55-day expedition traveled from Valparaiso to Punta Arenas, Chile, exploring the ocean from the central to the southern coastline of the country.
The cruise, the first in the region to use a remotely operated vehicle, or ROV, to transmit imagery in real-time, was co-led by Drs. Jeffrey Marlow of Boston University, USA, Patricia Esquete of the University of Aveiro, Portugal, and Eulogio Soto from the University of Valparaiso, Chile. The team also used sonar-based bubble mapping, bathymetric mapping, and measurements of in situ methane concentration to map canyons and locate methane seeps. The work included researchers from Chile, the United States, Portugal, Norway, Germany, the Netherlands, Spain, and Italy.
Methane seeps are chemosynthetic environments where methane bubbles up from the seafloor, feeding microbes that, in turn, support an array of life. While clues from water chemistry measurements and images from camera tows taken on previous expeditions to the region suggested the presence of some seeps off of Chile, many sites had not been fully surveyed and sampled before. In addition, several seep sites were entirely new to science. Some were in shallow waters, others in deep waters; some were in rocky areas, and others were in sediment.
One observation the team was particularly impressed by was abundant red cusk-eels called congrio colorado (Genypterus chilensus) — a commercially important fish that is highly valued in Chile —swimming in and around an 892-square-meter (9600-square-foot) tubeworm mound near a methane seep. Poet and Nobel Laureate Pablo Neruda celebrated this iconic Chilean fish; upon returning to the country from exile in 1954, he wrote an ode to the eel as a celebration of his home country and life.
While these fish have been observed around reefs and soft-bottom mangrove ecosystems, there has been little documentation of their behavior swimming near methane seeps. Scientists require further research to understand the species’ relationship with methane seeps and to determine if these environments are essential to sustaining their populations.
“These exploratory expeditions are incredible — and essential — opportunities for the science community to improve our understanding of the planet,” said Esquete. “After extensive sampling, we suspect our team has found at least 60 species new to science and will be working over the next few years to confirm this.”
The team explored four unnamed submarine canyons in southern Chile for the first time, mapping them to a high resolution. The largest of the canyons is approximately 2000 square kilometers (770 square miles) and the deepest is over 3000 meters deep (1.86 miles). Submarine canyons are critical ecosystems that connect land to the open ocean. The rocky canyon walls provide structures for habitat-building animals like glass sponges and deep-sea corals, which support species from tiny bristle stars to octopus.
An additional methane seep was discovered in one of the canyons near Chile’s triple junction, a place on the seafloor where three tectonic plates meet.
Other notable observations included large congregations of Humboldt Squid feeding near the seeps, a sighting of a glowing anglerfish scientists are still working to identify, massive chemosynthetic clam beds, and a shimmering polychaete worm that garnered the attention of millions on social media during the expedition.
“This expedition is yet another example of the tremendous value of bringing together cross-disciplinary science teams and cutting-edge technology to little-known regions of our global Ocean,” said Dr. Jyotika Virmani, executive director of Schmidt Ocean Institute. “The diverse marine life swimming contentedly in this geologically interesting ecosystem was beautiful to watch — a strong reminder that what is out of sight should perhaps not be out of mind.”
About the Organizations
Schmidt Ocean Institute was established in 2009 by Eric and Wendy Schmidt to catalyze the discoveries needed to understand our ocean, sustain life, and ensure the health of our planet through the pursuit of impactful scientific research and intelligent observation, technological advancement, open sharing of information, and public engagement, all at the highest levels of international excellence. For more information, visit www.schmidtocean.org.
Founded in 1839, Boston University is an internationally recognized institution of higher education and research. With nearly 37,000 students, it is one of the largest private residential universities in the United States. BU consists of 17 schools and colleges, along with the Faculty of Computing & Data Sciences and a number of multi-disciplinary centers and institutes integral to the University’s research and teaching mission. In 2012, BU joined the Association of American Universities (AAU), a consortium of leading research universities in the United States and Canada.
The University of Aveiro (UA) was founded in 1973 and paved the way in the creation of teaching offers in several knowledge fields. Today, UA is widely recognised as one of the most innovative universities in Portugal, the quality of its teaching and research and for its cooperation with regional and national business.Its organisation and matrix structure, encompassing University and Polytechnic subsystems, stimulates knowledge exchange and cross-contamination between knowledge fields, promoting a useful proximity between teaching and research, which results in a very appealing message for national and international students.