RESEARCH HIGHLIGHT
28 February 2024
In a large US cohort of mother–child dyads, prenatal exposure to phthalate metabolites was associated with varying degrees of negative birth outcomes. More
Species extinctions are speeding up worldwide. Biodiversity monitoring and assessment must underpin efforts to tackle this crisis (E. Tekwa et al. Phil. Trans. R. Soc. B 378, 20220181; 2023). Yet expertise in taxonomy, the scientific basis for biodiversity research and management, has been in decline.
Competing Interests
The authors declare no competing interests. More
Download the 26 February long read podcastThe phenomenon of animals catching diseases from humans, called reverse zoonoses, has had a severe impact on great ape populations, often representing a bigger threat than habitat loss or poaching.However, while many scientists and conservationists agree that human diseases pose one of the greatest risks to great apes today there are a few efforts under way to use a research-based approach to mitigate this problem.This is an audio version of our Feature Chimpanzees are dying from our colds — these scientists are trying to save themNever miss an episode. Subscribe to the Nature Podcast on Apple Podcasts, Google Podcasts, Spotify or your favourite podcast app. An RSS feed for Nature Podcast is available too. More
Download the Nature Podcast 22 February 2024The deep haunting tones of the world’s largest animals, baleen whales (mysticetes), are iconic. But how the songs are produced has long been a mystery. Whales evolved from land dwelling mammals, which vocalize by passing air through a structure called the larynx — a structure that also helps keep food from entering the respiratory system. However, toothed whales such as dolphins do not use their larynx to make sound, instead they have evolved a specialized organ in their nose. Now a team of researchers have discovered the structure used by baleen whales — a modified version of the larynx. Whales like humpbacks and blue whales are able to create powerful vocalizations but their anatomy also limits the frequency of the sounds they can make and depth at which they can sing. This leaves them unable to escape anthropogenic noise pollution that occurs in the same range.Article: Evolutionary novelties underlie sound production in baleen whalesSubscribe to Nature Briefing, an unmissable daily round-up of science news, opinion and analysis free in your inbox every weekday.Never miss an episode. Subscribe to the Nature Podcast on Apple Podcasts, Google Podcasts, Spotify or your favourite podcast app. An RSS feed for the Nature Podcast is available too. More
The LeDNA project will disperse hundreds of volunteers to sample environmental DNA from the world’s lakes.Credit: K. Deiner
In a first-of-its-kind project, researchers are tapping into the power of citizen science to collect DNA samples from hundreds of lakes worldwide. Not only will the resulting cache of environmental DNA (eDNA) be the largest ever gathered from an aquatic setting in a single day — it could yield a fuller picture of the state of biodiversity around the globe and improve scientists’ understanding of how species move about over time.
Rare bird’s detection highlights promise of ‘environmental DNA’
Scientists are increasingly using eDNA — which is shed by all organisms — to evaluate the presence of species in a given environment. Researchers have shown that it can be cheaply and efficiently extracted from water1, soil2, ice cores3 and filters from air-monitoring stations4. It has even been used to detect endangered species that haven’t been spotted for years, including a Brazilian frog species (putatively assigned to Megaelosia bocainensis) that researchers thought went extinct in the 1960s5.Kristy Deiner, an environmental scientist at the Swiss Federal Institute of Technology (ETH) in Zurich who leads the massive lake project, says that eDNA represents a “paradigm shift” in how scientists monitor biodiversity. Deiner’s research group has already received applications from more than 500 people across 101 countries to participate in collecting eDNA from their local lakes and shipping the samples to ETH Zurich.These global-scale projects are “really what the eDNA community needs”, says Philip Francis Thomsen, an environmental scientist at Aarhus University in Denmark and a volunteer for the lake project.“By involving citizens, we not only increase the geographical scope of our sampling but also foster a sense of public ownership and awareness regarding global biodiversity issues,” says Cátia Lúcio Pereira, the project’s coordinator, who works with Deiner at ETH Zurich.A boon for biodiversityAlthough eDNA is generally considered to be a boon for biodiversity monitoring, researchers recognize that it’s not perfect. For instance, DNA from a particular site might come from a species that just briefly passed through the region, rather than living there. And researchers don’t have a clear understanding of how factors such as microbial ingestion of the DNA, high temperatures and ultraviolet radiation degrade the genetic material once it has been shed, or how those factors might alter the list of species detected.Deiner acknowledges the limitations, but says that eDNA-monitoring technology has come a long way since it was first used decades ago. She and her team have a plan to carefully handle the samples they receive, extract their genetic material and amplify the plant and animal DNA to detect the presence of species.“We’re more fine-tuning things now,” Deiner says.
Source: LeDNA.
Deiner also doesn’t necessarily see the transfer of eDNA from one region to another as a negative thing — it could even be used to her advantage. She began studying how eDNA moves in rivers about ten years ago. The genetic material, she suggests, could flow from soil, down rivers and into lakes, making these watery pools the ideal location to sample from to get an idea of the species diversity of an entire region, or catchment.Her project — called LeDNA, which stands for lake eDNA — aims to prove that the eDNA from a lake represents not just lake-dwelling species, but also terrestrial animals that live along the rivers that feed into the lake and around the lake itself. It will also examine the differences in species richness between geographical regions, and try to decipher how species in various habitats might be interacting with one another.Local samplingDeiner’s research group recruited volunteers for LeDNA through a combination of social media, networking with other eDNA researchers and reaching out to citizen-science groups. The recruits will be assigned a lake near them from a curated list of 5,000 around the globe.“We really worked hard to try and reach a lot of these areas so that the sample is truly a global effort,” Deiner says.
Accidental DNA collection by air sensors could revolutionize wildlife tracking
Although the team hasn’t finalized the lakes that it will sample, it hopes to include about 800, says Lúcio Pereira (see ‘Sampling sites’). The researchers also say that they have mostly finished their recruiting phase, although they still want more volunteers in Asia, North Africa and the Middle East.Once assigned a lake, volunteers will receive instructions and a water-sampling filter. They will all aim to gather their samples on the same day — 22 May, which is the International Day for Biological Diversity — although there is a flexible two-week window for collection if they need it.Francis Thomsen points out that hundreds of people taking samples might lead to issues with data quality, depending on how closely they each follow the set protocols sent to them. Sampling eDNA, however, is easier to standardize than other biodiversity-monitoring methods, in which surveyors typically have to locate and identify individual species in person, he says.Lúcio Pereira says that the team recognizes the possible threat to data quality, but that the volunteers will all have identical sampling kits and in-depth training on the sampling protocol.A perk of participating in the project, particularly for eDNA scientists, is that local partners will be able to use their data in their own research, as well as contribute to LeDNA publications. “What’s cool about this is it’s participatory,” says Rachel Meyer, director of the California eDNA programme, which is run by University of California researchers and matches volunteers with scientists to collect eDNA samples across the state. The data is there “if people want it”, she says, “and there’s plenty of incentive to want it”. More
More than 40% of migratory species are declining, according to a United Nations report. Sanderlings breed in the Arctic before travelling to North and South America.Credit: Getty
Earlier this month, conservationists and biodiversity scientists received some rare, good news at the first meeting of a much-anticipated fund for projects aimed at preserving Earth’s biodiversity. The Global Biodiversity Framework Fund (GBFF) will provide grants for projects that protect biodiversity, especially in countries with a high variety of marine and terrestrial life, as measured by a global biodiversity index (see go.nature.com/3wekupz). So far, five nations — Canada, Germany, Japan, Spain and the United Kingdom — have pledged money to the tune of US$219 million.At the meeting on 8 and 9 February, the GBFF’s co-chairperson, Costa Rica’s former environment and energy minister Carlos Manuel Rodríguez, called the fund’s establishment “one of his proudest and most significant moments”, and he urged other countries to support the initiative, too. They should — and fast.
The ‘Bill Gates problem’: do billionaire philanthropists skew global health research?
Research suggesting that urgent action is needed to stem biodiversity loss is regularly published. The latest warnings come from the United Nations’ first report that looks at the state of the world’s migratory species — billions of birds, fish, insects, mammals and reptiles travel thousands of kilometres each year for food or to breed (see go.nature.com/4bxrmag). Published on 12 February by the UN Convention on the Conservation of Migratory Species of Wild Animals, the report reveals that 44% of migratory species are declining, and that 22% of them are threatened with extinction. There is no time to lose.The launch of a global public fund for biodiversity is rare. The GBFF’s parent fund, the Global Environment Facility in Washington DC, was established more than three decades ago with an initial endowment of $1 billion. Between 2022 and 2026, it plans to distribute $840 million between 45 projects related to biodiversity, climate, international waters and land degradation.But the GBFF has an extra purpose: to help countries to achieve targets for slowing down and, eventually, halting the decline in global biodiversity. These targets, agreed at a UN biodiversity meeting (COP15) in Montreal, Canada, in December 2022, are collectively known as the Kunming–Montreal Global Biodiversity Framework. One goal is to protect and restore 30% of the world’s land and seas by 2030.
Can the world save a million species from extinction?
These UN-mediated funds are just one source of biodiversity funding. In 2019, private and public sources contributed between $78 billion and $143 billion, according to a landmark 2021 review of biodiversity economics for the UK government (see go.nature.com/49fe686). But even this is a fraction of the up-to $967 billion needed annually to achieve the 2030 targets, according to a study of biodiversity financing (G. A. Karolyi & J. Tobin-de la Puente Financ. Manage. 52, 231–251; 2023). And that means the $219 million that countries have promised to the GBFF is, perhaps literally, a drop in the ocean.Other wealthy countries must contribute, too. More than two years ago, China established the Kunming Biodiversity Fund, worth $235 million. Yet this fund is still not operational. It needs to be allocated to projects as soon as possible. And the United States, too, should contribute an amount to the GBFF that reflects the size of its economy. In 2022, the US Agency for International Development contributed $383 million to biodiversity conservation programmes worldwide.Returns on investmentThe fact that the GBFF is committed to providing grants, not loans is important. But this might also be one of the reasons why current pledges are not being translated into funds that can be distributed. Climate funds, for example, are given mostly as loans and not grants. They support renewable energy projects, for instance, or factories that make electric batteries — meaning that international donors could expect to make money on what are essentially investments. By contrast, biodiversity funds that support projects to protect wetlands for migratory birds or manage agricultural lands in nature-friendly ways often do not provide returns — at least not in terms of cash. This is partly because current economic systems fail to see the value that a healthy planet provides through biodiversity and ecosystem services.
The answer to the biodiversity crisis is not more debt
To help increase the pot of money, the GBFF will accept funding from philanthropic foundations — an increasingly important source of environment and development grants. Getting such foundations to contribute to international public funds is not easy, and it’s good to see GBFF advocates working on persuading them. Foundations will need to give up some of their autonomy in deciding on which projects will receive a grant. But they should see the invitation to participate in the GBFF as a benefit, rather than a burden. The fund’s global nature means that more biodiversity projects can receive grants. This could help more parts of the planet and greater numbers of people than when projects are funded by a foundation on its own. Having foundations participate in international public funds can only be a good thing, especially at a time when they are in the spotlight for a perceived lack of accountability.Getting nearly 200 countries to reach an agreement on the make-up of any new institution, and then getting donors to fund it, is one of the hardest parts of multilateral policymaking. The architects of the GBFF should be congratulated on getting their fund off the ground and securing an early round of pledges. It’s now time to translate words into action. More
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Migrations of marine species such as whales, eels and sea turtles are some of the largest in the world. Identifying, monitoring and maintaining ecological corridors is one focus of the Kunming–Montreal Global Biodiversity Framework, which was adopted in 2022 at the United Nations COP15 biodiversity summit, chaired by China.
Competing Interests
The authors declare no competing interests. More
