Maui, an island in the isolated Hawaiian archipelago, isn’t in one of the world’s most heavily developed or polluted coral-reef regions. Yet even there, human activity leaves an imprint in the very tissue of corals, altering their biochemistry, a recent study shows. The study, published in July in the journal Nature Communications, found 25 contaminants from cosmetic products, medicines and agricultural runoff, among other forms of pollution, in coral tissues at many Maui reef sites. Contaminant levels were higher at the sites subject to greater human influence. The research was done by analyzing corals’ metabolomes — the collection of small molecules in their tissues, such as sugars, lipids and amino acids, that does not include larger molecules like DNA or proteins. The study is among the first to use coral-tissue metabolomics to monitor chronic human-caused stress on corals in the wild. Whereas a water sample of a coral reef site provides a snapshot of what contaminants are present, coral tissue can reveal those that have accumulated over time. “We propose that this may be a way that you can actually evaluate how much impact humans are having on different sites,” Zachary Quinlan, research biologist at the University of Hawai’i at Mānoa and lead author of the study, told Mongabay in a video interview. A coral reef in 2020. Image courtesy of Tiara Stark/TNC. Under threat globally, corals are particularly vulnerable to local stressors because of their immobility. “If there’s a site that has a lot of contamination, they can’t move…This article was originally published on Mongabay

Seabird protections drew debate at the annual meeting of the Commission for the Conservation of Southern Bluefin Tuna (CCSBT), held Oct. 5-8 in Brussels. The eight-member multilateral body that manages the stock has long struggled to curb seabird deaths caused by longline fishing targeting southern bluefin tuna (Thunnus maccoyii) across several oceans. This year’s meeting saw a modicum of progress on the issue. Based on recent modeling, the parties agreed on 13 priority seabird species for conservation efforts and designated high-risk areas for them. However, the designations don’t carry any new mandatory protections: Due to the reluctance of some members, the commission stopped short of adopting proposed conservation measures for the high-risk areas, most notably tighter seabird bycatch mitigation requirements. Oliver Yates, head of the marine program at BirdLife International, a U.K.-based NGO, told Mongabay that the identification of high-risk areas was “a good step forward” but said it was a problem that “they’ve not then adopted any management action to accompany the fishing activity in those spatial areas.” “[T]hey recognise bycatch of seabirds is a very serious issue but again agreed to do nothing about it,” Yates, who attended the Brussels meeting, added in a text message. There are more than a dozen RFMOs in the world, with some overlapping geographically but managing different fish stocks. The map shows the five best-known and most commercially important RFMOs, which focus on tuna and tuna-like species. Image courtesy of Pew Charitable Trusts. Sources: U.N. Food and Agriculture Organization, FAO Map Catalog.…This article was originally published on Mongabay

BAY OF ISLANDS, Aotearoa New Zealand — Since an invasive seaweed called caulerpa was discovered in Aotearoa New Zealand in 2021, forming meadows that blanketed parts of the seabed, it’s taken on an almost mythical status among people who spend time in coastal waters. “It’s so wily and so resilient,” Michele Rogalin-Henderson, a doctoral candidate at the University of Auckland’s Institute of Marine Science, told Mongabay. “Yes, I did say wily,” she added. “I anthropomorphize it. I spend a lot of time in the lab and in the field with this beast.” Stephen Te Tai, a commercial diver who removes the caulerpa, mainly in the Bay of Islands area in New Zealand’s tropical far north, also spoke about the invasive seaweed in such terms. “I know it’s airy fairy but sometimes I feel its energy,” Te Tai told Mongabay. In winter, he said, “it’s real low, it’s almost cowering, but in the summertime, it feels like its chest is puffed out, and it’s real vibrant and strong.” Te Tai is Ngāti Hine, a Māori tribal grouping, and his surname means “coast” or “tide” in Māori. He spoke to Mongabay on the shoreline after he’d worked in the waters off Urupukapuka Island one day in July. “The moana [ocean] is vital to our people,” he later added in a text message. “It is not just something that nourishes us, it is a part of us, it was a part of our ancestors and it will be part of our mokopuna [descendants].…This article was originally published on Mongabay