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The finding helps explain how vent animals, stranded at scattered and short-lived openings on the seafloor, colonize fresh sites and stay genetically linked across hundreds of miles. <\/p>\n
Their young first feed and grow in rich surface water. Then they ride ocean currents toward a new patch of seafloor before dropping back into the dark to settle.<\/p>\n
Reading vent limpet shells<\/p>\n
A vent limpet begins life as a swimming larva no larger than a grain of sand. It keeps that first shell, even after it settles and hardens into an adult clamped to the rock. <\/p>\n
Those retained larval shells<\/a> turned out to hold a chemical record of where each animal had spent its infancy.<\/p>\n Takuya Yahagi, a marine biologist at the University of Tokyo\u2019s Atmosphere and Ocean Research Institute (UTokyo<\/a>), and his colleagues read that record by measuring the chemistry of the shell itself.<\/p>\n Water temperature is the key. As a larva grows its shell from calcium carbonate, the mineral locks in a signature that is tied to how warm or cold the surrounding water was.<\/p>\n Reading the record meant isolating the shell\u2019s newborn layer from everything the animal added after settling.<\/p>\n The study\u2019s lead author, Yahagi, told Earth.com, \u201cThe larval shell is less than a millimeter across, and the temperature information is preserved only within this extremely thin structure.\u201d<\/p>\n Patterns present in vent limpet shells<\/p>\n Warm water and cold water leave different marks. The surface of the ocean is far warmer than the near-freezing water around a deep-sea vent. <\/p>\n That means the warm signal in the oldest part of a shell could only have formed near the sunlit surface. Those animals came from vents in the western Pacific, gathered by research vessels working thousands of feet down.<\/p>\n A separate approach<\/a> on the same species has shown that trace metals in these shells differ from vent to vent. This raises the possibility of tracing an animal to its exact birthplace.<\/p>\n Vent communities are among the rare ecosystems that run on chemical energy welling up from the seafloor rather than sunlight. That makes the surface detour easy to overlook.<\/p>\n In an email to Earth.com, Yahagi said, \u201cIt reminds us that even ecosystems fueled by Earth\u2019s interior are still linked to the ocean above.\u201d<\/p>\n Rising to the surface<\/p>\n The shells told the same story every time. Every limpet that the team tested carried a warm-water signature from its earliest days.<\/p>\n That finding suggests each one almost certainly spent its larval stage high above the seafloor rather than lingering near the vent.<\/p>\n In the top few hundred feet of ocean, sunlight fuels blooms of phytoplankton<\/a>. These tiny floating plants form the base of the ocean\u2019s food web, but they are not found around deep-sea vents.<\/p>\n At the sunlit surface, food is everywhere. The drifting limpet larvae feed on that harvest and grow many times larger before they are ready to settle.<\/p>\n Strong surface currents carry the larvae far from where they hatched. When a larva finally sinks back into the dark and lands on a suitable vent, it carries a shell that already records its journey to the surface.<\/p>\n Years of clues<\/p>\n Researchers had suspected this pattern of larval dispersal for years, but only indirectly.<\/p>\n An earlier study<\/a> raised vent limpet larvae in the lab and found they swam steadily upward and grew best at temperatures matching the sun-warmed surface, not the chilly vent below.<\/p>\n None of that, though, could confirm that any single animal had actually made the trip. <\/p>\n \u201cDirectly observing or tracking these microscopic larvae in the open ocean is extremely difficult,\u201d said Yahagi. The shells closed that gap by recording each larva\u2019s own history rather than a general expectation.<\/p>\n Genetic evidence had pointed in the same direction. Populations of one vent limpet sampled across thousands of miles of the western Pacific showed almost no genetic separation in one analysis<\/a>.<\/p>\n Such a pattern could only occur if larvae mix freely over long distances between isolated vent fields.<\/p>\n Expanding the study<\/p>\n The team examined limpets living around 6,600 feet (1,830 meters) down, but hydrothermal vents lie much deeper. Some reach depths of 16,400 feet (4,800 meters).<\/p>\n Researchers now plan to test whether larvae from those extreme depths also climb all the way to the surface, which would represent an even more astounding journey.<\/p>\n For now, each shell provides a single temperature reading. Yasunori Kano, an associate professor and co-author, wants to read them in finer detail.<\/p>\n This would involve pulling temperatures from different parts of a larval shell to trace not only the climb to the surface but also the return trip down into the deep.<\/p>\n The prospect of deep-sea mining<\/p>\n The findings matter far beyond these limpets. Hydrothermal vents are laced with copper, zinc, and gold. Companies have begun eyeing them for deep-sea mining<\/a>. This would mean tearing into the very habitats these larvae are born to recolonize.<\/p>\n In an email to Earth.com, Yahagi said, \u201cWhat concerns me most is the possibility that climate change and deep-sea mining could reduce larval exchange between hydrothermal vent populations.\u201d<\/p>\n He was careful to call that a possibility rather than a proven effect, one that will need testing across many more vent species.<\/p>\n What was once an educated guess now sits on solid evidence. These limpets spend their infancy at the surface before settling in the deep.<\/p>\n That changes how scientists judge the resilience of vent communities. A site lost to mining or an eruption can recover only if larvae drifting far overhead happen to settle there.<\/p>\n The study is published in Science Advances<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"Every deep-sea limpet that a team of Japanese researchers collected from scalding hydrothermal vents in the western Pacific…\n","protected":false},"author":2,"featured_media":813175,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[64,63,128],"class_list":["post-813174","post","type-post","status-publish","format-standard","has-post-thumbnail","category-science","tag-au","tag-australia","tag-science"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts\/813174","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/comments?post=813174"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts\/813174\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/media\/813175"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/media?parent=813174"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/categories?post=813174"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/tags?post=813174"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}