Latest news with #ZhigangMei
Yahoo
14-05-2025
- Science
- Yahoo
Ancient poetry unveils hidden history of critically endangered finless porpoises, scientists say
Sign up for CNN's Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. A research team in China got creative in its efforts to save a critically endangered species by turning to ancient poems. The scientists pored over more than 700 ancient Chinese poems from the Tang through the Qing dynasties that mention the Yangtze finless porpoise to find out where and when poets described seeing the animal because little is known about its population history. The Yangtze finless porpoise — the world's only freshwater porpoise — has faced extreme declines in numbers in the past four decades. With fewer than 1,300 individuals left in the wild, scientists in eastern China have made huge efforts to better understand the animal's past habitat range to better inform future conservation initiatives. The findings were stark: The data suggests that the historic range of the finless porpoise has shrunk by 65% over the past 1,200 years, with the most extreme reduction happening over the past century. The team published the findings in the journal Current Biology on May 5. 'Some older fishers told me they used to frequently see porpoises in areas where they've now disappeared completely,' study coauthor Zhigang Mei told CNN in an email. 'That really sparked my curiosity: Where did these porpoises historically live?' Yangtze finless porpoises only live in the middle-lower Yangtze River basin in eastern China. From the early 1980s until the 2010s, the population steeply declined an estimated 60%, according to a 2014 study, due to a combination of illegal fishing practices, industrial pollution in waterways, dams and sand mining in the adjoining lakes. Because hard scientific data for the porpoise only exists for recent decades, scientists have a very narrow understanding of its spatial distribution. This creates a problem known as shifting baseline syndrome, explained Mei, a professor at the Institute of Hydrobiology, Chinese Academy of Sciences, in Wuhan. '(This research) answers important questions about what constitutes a healthy population,' he said, which will help with setting realistic management goals. 'Without historical baselines, there is a risk of shifting expectations downward over generations, accepting an ever-declining status as 'normal.'' When Mei and his colleagues started poking around archives for answers, they were surprised. Official records such as local gazettes and county chronicles didn't have any information about the porpoises — only terrestrial megafauna like tigers and elephants, species that have frequent conflict with humans. Porpoises, in contrast, are less likely to have close encounters with humans. (No drama, no record.) Instead, sightings were typically by local, less-educated anglers or wealthy travelers — who caught glimpses of the elusive porpoises while traveling the Yangtze River by boat — and weren't formally recorded, Mei said. Facing this dead end, the scientists realized ancient poems could come in handy. 'We were amazed,' Mei said of the researchers efforts to explore written documentation via literature. The authors sorted through hundreds of poems dating back to AD 830 that referenced porpoises. For each poem, the scientists looked for evidence of locations, such as descriptions of unique geographical features of the Yangtze River basin. Then, the team researched the poem's time period and each poets' personal history to ensure their accuracy. About half of the poems contained precise location information, allowing the team to map sightings for each dynasty. Ancient Chinese poetry is often nonfiction, including first-person accounts of everyday life and observations of nature, the authors explained. That's why the poems served as a reasonable metric for finless porpoise sightings throughout the river basin. 'Emerald seals the jade-green tiles as idle dawn clouds drift / Specks of porpoises vanish between the waves' swift lift,' reads one Qing Dynasty poem by Gu Silì 顾嗣立 called 'Crossing the River in Rain, Looking at Jinshan,' as translated by lead study author Yaoyao Zhang, an ecologist at the Institute of Hydrobiology, Chinese Academy of Sciences. 'It's beautiful, actually,' said Paulo Corti, a conservation ecologist at Austral University of Chile who was not involved in the research. 'They did something great with some very simple information.' Using historic materials for science isn't uncommon — especially in paleontology or archaeology — but it's less often used for wildlife research, Corti said. 'It's a very useful tool, especially when you refine the analysis, taking those qualitative data into quantitative (data),' he said. The poetry data only offers an estimate. However, it's the study authors' best source for formulating how the Yangtze finless porpoise population's distribution changed before modern times. Such studies need to be conducted carefully, adds Corti, who has written journal articles about responsibly using historical records for wildlife studies after noticing that some scientists were using such data inappropriately. One major limitation of cultural records is human error, he explained. A fisherman or hunter, for example, is a more reliable observer than a foreign explorer likely to misidentify similar-looking animals. That's why the study authors researched each poet's background, such as where they lived and traveled, to verify their observations. The Yangtze finless porpoise looks distinct, with a short snout, dark gray color and signature lack of a dorsal fin, which sets it apart from its dolphin relatives. As mammals, porpoises need to surface for air, making them visible to humans, said study coauthor Jiajia Liu, a professor of biodiversity science at Fudan University in Shanghai. And because finless porpoises did not historically hold cultural importance, it was less likely for poets to write about them without a literal observation, he added. For these reasons, the researchers trusted the poems for data. That said, the authors acknowledge that some historical references of the river porpoise could be confused with the now-extinct baiji, a freshwater dolphin that lived in the Yangtze. But this species was much bigger, lighter-colored, and touted a long snout — its most distinguishing feature, Mei said. Indeed, the baiji serves as a cautionary tale for the finless porpoise. The freshwater dolphin already became functionally extinct in 2006 from many of the same threats. Extinction of the finless porpoise would throw the ecosystem out of balance, Liu explained. As a top predator, the porpoise eats fish that feed on aquatic grasses. The rare mammal is also an ecosystem engineer by facilitating a process called nutrient cycling. By migrating long distances, the finless porpoise carries nitrogen and phosphorus from the river bottom to its surface, and from downstream to upstream. Now that there is some evidence that the finless porpoise lived not only in the main river, but also in tributaries and lakes, scientists have a better idea of where the porpoise historically thrived — and whether it might thrive in those locations once again. With captive breeding — a process in which endangered species are bred in captivity and released back into the wild — underway since 1996, the authors hope their new findings may help inform future conservation efforts, such as identifying areas where they can be released. But it's important not to jump to conclusions, Corti warned. Using such information for modern-day wildlife management requires a thorough understanding of species behavior, morphology, diet and other factors, he said. 'You can make a lot of mistakes' extrapolating historic observational data to inform future management decisions, he added. 'If you are trying to see what happened with the species in the past, you need to know what is going on now,' Corti said. Importantly, Mei noted, this study creates a link between endangered species and culture, which could attract public attention. If the Yangtze finless porpoise can be a flagship species, such as the panda, it will help improve their conservation, he said. Over the past few years, the porpoise population increased for the first time, thanks in part to conservation policies such as fishing bans. 'Conservation is not only (for) scientists,' Mei said. 'It's about everyone, it's about our culture.'
CNN
14-05-2025
- Science
- CNN
Ancient poetry unveils history of critically endangered finless porpoises, scientists say
A research team in China got creative in its efforts to save a critically endangered species by turning to ancient poems. The scientists pored over more than 700 ancient Chinese poems from the Tang through the Qing dynasties that mention the Yangtze finless porpoise to find out where and when poets described seeing the animal because little is known about its population history. The Yangtze finless porpoise — the world's only freshwater porpoise — has faced extreme declines in numbers in the past four decades. With fewer than 1,300 individuals left in the wild, scientists in eastern China have made huge efforts to better understand the animal's past habitat range to better inform future conservation initiatives. The findings were stark: The data suggests that the historic range of the finless porpoise has shrunk by 65% over the past 1,200 years, with the most extreme reduction happening over the past century. The team published the findings in the journal Current Biology on May 5. 'Some older fishers told me they used to frequently see porpoises in areas where they've now disappeared completely,' study coauthor Zhigang Mei told CNN in an email. 'That really sparked my curiosity: Where did these porpoises historically live?' Yangtze finless porpoises only live in the middle-lower Yangtze River basin in eastern China. From the early 1980s until the 2010s, the population steeply declined an estimated 60%, according to a 2014 study, due to a combination of illegal fishing practices, industrial pollution in waterways, dams and sand mining in the adjoining lakes. Because hard scientific data for the porpoise only exists for recent decades, scientists have a very narrow understanding of its spatial distribution. This creates a problem known as shifting baseline syndrome, explained Mei, a professor at the Institute of Hydrobiology, Chinese Academy of Sciences, in Wuhan. '(This research) answers important questions about what constitutes a healthy population,' he said, which will help with setting realistic management goals. 'Without historical baselines, there is a risk of shifting expectations downward over generations, accepting an ever-declining status as 'normal.'' When Mei and his colleagues started poking around archives for answers, they were surprised. Official records such as local gazettes and county chronicles didn't have any information about the porpoises — only terrestrial megafauna like tigers and elephants, species that have frequent conflict with humans. Porpoises, in contrast, are less likely to have close encounters with humans. (No drama, no record.) Instead, sightings were typically by local, less-educated anglers or wealthy travelers — who caught glimpses of the elusive porpoises while traveling the Yangtze River by boat — and weren't formally recorded, Mei said. Facing this dead end, the scientists realized ancient poems could come in handy. 'We were amazed,' Mei said of the researchers efforts to explore written documentation via literature. The authors sorted through hundreds of poems dating back to AD 830 that referenced porpoises. For each poem, the scientists looked for evidence of locations, such as descriptions of unique geographical features of the Yangtze River basin. Then, the team researched the poem's time period and each poets' personal history to ensure their accuracy. About half of the poems contained precise location information, allowing the team to map sightings for each dynasty. Ancient Chinese poetry is often nonfiction, including first-person accounts of everyday life and observations of nature, the authors explained. That's why the poems served as a reasonable metric for finless porpoise sightings throughout the river basin. 'Emerald seals the jade-green tiles as idle dawn clouds drift / Specks of porpoises vanish between the waves' swift lift,' reads one Qing Dynasty poem by Gu Silì 顾嗣立 called 'Crossing the River in Rain, Looking at Jinshan,' as translated by lead study author Yaoyao Zhang, an ecologist at the Institute of Hydrobiology, Chinese Academy of Sciences. 'It's beautiful, actually,' said Paulo Corti, a conservation ecologist at Austral University of Chile who was not involved in the research. 'They did something great with some very simple information.' Using historic materials for science isn't uncommon — especially in paleontology or archaeology — but it's less often used for wildlife research, Corti said. 'It's a very useful tool, especially when you refine the analysis, taking those qualitative data into quantitative (data),' he said. The poetry data only offers an estimate. However, it's the study authors' best source for formulating how the Yangtze finless porpoise population's distribution changed before modern times. Such studies need to be conducted carefully, adds Corti, who has written journal articles about responsibly using historical records for wildlife studies after noticing that some scientists were using such data inappropriately. One major limitation of cultural records is human error, he explained. A fisherman or hunter, for example, is a more reliable observer than a foreign explorer likely to misidentify similar-looking animals. That's why the study authors researched each poet's background, such as where they lived and traveled, to verify their observations. The Yangtze finless porpoise looks distinct, with a short snout, dark gray color and signature lack of a dorsal fin, which sets it apart from its dolphin relatives. As mammals, porpoises need to surface for air, making them visible to humans, said study coauthor Jiajia Liu, a professor of biodiversity science at Fudan University in Shanghai. And because finless porpoises did not historically hold cultural importance, it was less likely for poets to write about them without a literal observation, he added. For these reasons, the researchers trusted the poems for data. That said, the authors acknowledge that some historical references of the river porpoise could be confused with the now-extinct baiji, a freshwater dolphin that lived in the Yangtze. But this species was much bigger, lighter-colored, and touted a long snout — its most distinguishing feature, Mei said. Indeed, the baiji serves as a cautionary tale for the finless porpoise. The freshwater dolphin already became functionally extinct in 2006 from many of the same threats. Extinction of the finless porpoise would throw the ecosystem out of balance, Liu explained. As a top predator, the porpoise eats fish that feed on aquatic grasses. The rare mammal is also an ecosystem engineer by facilitating a process called nutrient cycling. By migrating long distances, the finless porpoise carries nitrogen and phosphorus from the river bottom to its surface, and from downstream to upstream. Now that there is some evidence that the finless porpoise lived not only in the main river, but also in tributaries and lakes, scientists have a better idea of where the porpoise historically thrived — and whether it might thrive in those locations once again. With captive breeding — a process in which endangered species are bred in captivity and released back into the wild — underway since 1996, the authors hope their new findings may help inform future conservation efforts, such as identifying areas where they can be released. But it's important not to jump to conclusions, Corti warned. Using such information for modern-day wildlife management requires a thorough understanding of species behavior, morphology, diet and other factors, he said. 'You can make a lot of mistakes' extrapolating historic observational data to inform future management decisions, he added. 'If you are trying to see what happened with the species in the past, you need to know what is going on now,' Corti said. Importantly, Mei noted, this study creates a link between endangered species and culture, which could attract public attention. If the Yangtze finless porpoise can be a flagship species, such as the panda, it will help improve their conservation, he said. Over the past few years, the porpoise population increased for the first time, thanks in part to conservation policies such as fishing bans. 'Conservation is not only (for) scientists,' Mei said. 'It's about everyone, it's about our culture.'
CNN
14-05-2025
- Science
- CNN
Ancient poetry unveils history of critically endangered finless porpoises, scientists say
A research team in China got creative in its efforts to save a critically endangered species by turning to ancient poems. The scientists pored over more than 700 ancient Chinese poems from the Tang through the Qing dynasties that mention the Yangtze finless porpoise to find out where and when poets described seeing the animal because little is known about its population history. The Yangtze finless porpoise — the world's only freshwater porpoise — has faced extreme declines in numbers in the past four decades. With fewer than 1,300 individuals left in the wild, scientists in eastern China have made huge efforts to better understand the animal's past habitat range to better inform future conservation initiatives. The findings were stark: The data suggests that the historic range of the finless porpoise has shrunk by 65% over the past 1,200 years, with the most extreme reduction happening over the past century. The team published the findings in the journal Current Biology on May 5. 'Some older fishers told me they used to frequently see porpoises in areas where they've now disappeared completely,' study coauthor Zhigang Mei told CNN in an email. 'That really sparked my curiosity: Where did these porpoises historically live?' Yangtze finless porpoises only live in the middle-lower Yangtze River basin in eastern China. From the early 1980s until the 2010s, the population steeply declined an estimated 60%, according to a 2014 study, due to a combination of illegal fishing practices, industrial pollution in waterways, dams and sand mining in the adjoining lakes. Because hard scientific data for the porpoise only exists for recent decades, scientists have a very narrow understanding of its spatial distribution. This creates a problem known as shifting baseline syndrome, explained Mei, a professor at the Institute of Hydrobiology, Chinese Academy of Sciences, in Wuhan. '(This research) answers important questions about what constitutes a healthy population,' he said, which will help with setting realistic management goals. 'Without historical baselines, there is a risk of shifting expectations downward over generations, accepting an ever-declining status as 'normal.'' When Mei and his colleagues started poking around archives for answers, they were surprised. Official records such as local gazettes and county chronicles didn't have any information about the porpoises — only terrestrial megafauna like tigers and elephants, species that have frequent conflict with humans. Porpoises, in contrast, are less likely to have close encounters with humans. (No drama, no record.) Instead, sightings were typically by local, less-educated anglers or wealthy travelers — who caught glimpses of the elusive porpoises while traveling the Yangtze River by boat — and weren't formally recorded, Mei said. Facing this dead end, the scientists realized ancient poems could come in handy. 'We were amazed,' Mei said of the researchers efforts to explore written documentation via literature. The authors sorted through hundreds of poems dating back to AD 830 that referenced porpoises. For each poem, the scientists looked for evidence of locations, such as descriptions of unique geographical features of the Yangtze River basin. Then, the team researched the poem's time period and each poets' personal history to ensure their accuracy. About half of the poems contained precise location information, allowing the team to map sightings for each dynasty. Ancient Chinese poetry is often nonfiction, including first-person accounts of everyday life and observations of nature, the authors explained. That's why the poems served as a reasonable metric for finless porpoise sightings throughout the river basin. 'Emerald seals the jade-green tiles as idle dawn clouds drift / Specks of porpoises vanish between the waves' swift lift,' reads one Qing Dynasty poem by Gu Silì 顾嗣立 called 'Crossing the River in Rain, Looking at Jinshan,' as translated by lead study author Yaoyao Zhang, an ecologist at the Institute of Hydrobiology, Chinese Academy of Sciences. 'It's beautiful, actually,' said Paulo Corti, a conservation ecologist at Austral University of Chile who was not involved in the research. 'They did something great with some very simple information.' Using historic materials for science isn't uncommon — especially in paleontology or archaeology — but it's less often used for wildlife research, Corti said. 'It's a very useful tool, especially when you refine the analysis, taking those qualitative data into quantitative (data),' he said. The poetry data only offers an estimate. However, it's the study authors' best source for formulating how the Yangtze finless porpoise population's distribution changed before modern times. Such studies need to be conducted carefully, adds Corti, who has written journal articles about responsibly using historical records for wildlife studies after noticing that some scientists were using such data inappropriately. One major limitation of cultural records is human error, he explained. A fisherman or hunter, for example, is a more reliable observer than a foreign explorer likely to misidentify similar-looking animals. That's why the study authors researched each poet's background, such as where they lived and traveled, to verify their observations. The Yangtze finless porpoise looks distinct, with a short snout, dark gray color and signature lack of a dorsal fin, which sets it apart from its dolphin relatives. As mammals, porpoises need to surface for air, making them visible to humans, said study coauthor Jiajia Liu, a professor of biodiversity science at Fudan University in Shanghai. And because finless porpoises did not historically hold cultural importance, it was less likely for poets to write about them without a literal observation, he added. For these reasons, the researchers trusted the poems for data. That said, the authors acknowledge that some historical references of the river porpoise could be confused with the now-extinct baiji, a freshwater dolphin that lived in the Yangtze. But this species was much bigger, lighter-colored, and touted a long snout — its most distinguishing feature, Mei said. Indeed, the baiji serves as a cautionary tale for the finless porpoise. The freshwater dolphin already became functionally extinct in 2006 from many of the same threats. Extinction of the finless porpoise would throw the ecosystem out of balance, Liu explained. As a top predator, the porpoise eats fish that feed on aquatic grasses. The rare mammal is also an ecosystem engineer by facilitating a process called nutrient cycling. By migrating long distances, the finless porpoise carries nitrogen and phosphorus from the river bottom to its surface, and from downstream to upstream. Now that there is some evidence that the finless porpoise lived not only in the main river, but also in tributaries and lakes, scientists have a better idea of where the porpoise historically thrived — and whether it might thrive in those locations once again. With captive breeding — a process in which endangered species are bred in captivity and released back into the wild — underway since 1996, the authors hope their new findings may help inform future conservation efforts, such as identifying areas where they can be released. But it's important not to jump to conclusions, Corti warned. Using such information for modern-day wildlife management requires a thorough understanding of species behavior, morphology, diet and other factors, he said. 'You can make a lot of mistakes' extrapolating historic observational data to inform future management decisions, he added. 'If you are trying to see what happened with the species in the past, you need to know what is going on now,' Corti said. Importantly, Mei noted, this study creates a link between endangered species and culture, which could attract public attention. If the Yangtze finless porpoise can be a flagship species, such as the panda, it will help improve their conservation, he said. Over the past few years, the porpoise population increased for the first time, thanks in part to conservation policies such as fishing bans. 'Conservation is not only (for) scientists,' Mei said. 'It's about everyone, it's about our culture.'
Yahoo
05-05-2025
- Science
- Yahoo
Poems spanning 1,400 years tell the tale of a revered porpoise
A team of scientists in China turned to an unusual source to track the population of the Yangtze River's finless porpoises: ancient poems. The writings samples written over the past 1,400 years indicate that the Yangtze finless porpoises' (Neophocaena asiaeorientalis) range has decreased at least 65 percent and most of the declines have occurred within the past 100 years. The findings are detailed in a study published May 5 in the Cell Press journal Current Biology and connect biodiversity with almost two millennia of Chinese culture. 'Our work fills the gap between the super long-term information we get from fossils and DNA and the recent population surveys. It really shows how powerful it can be to combine art and biodiversity conservation,' Zhigang Mei, a study co-author and hydrobiologist at the Chinese Academy of Sciences said in a statement. Mei grew up alongside the Yangtze River revering the porpoises and the elders in his community taught that they were like spirits who could understand the weather and fish levels. Hurting the mammals was also considered bad luck. Stretching almost 4,000 miles from the Tanggula Mountains of the Tibetan Plateau to the East China Sea near Shanghai, the Yangtze is the longest river in Asia and the third longest in the world. Many poets have written about the body of water, including Qianlong, the emperor of the Qing dynasty. Since poets and tradespeople alike relied on the river and its tributaries for travel, many caught glimpses of the Yangtze finless porpoise. The porpoise is the only known freshwater porpoise in the world and used to live in most of the river. 'Compared to fish, Yangtze finless porpoises are pretty big, and they're active on the surface of the water, especially before thunderstorms when they're really chasing after fish and jumping around,' said Mei. 'This amazing sight was hard for poets to ignore.' In the study, the team systematically dug through preserved poems dating back to the year 618 CE and found hundreds of references to the porpoises. According to Mei, the fact that a freshwater mammal like the Yangtze finless porpoise appears so frequently reflects the deep connection between people and nature in Ancient China. 'One of the biggest challenges in this research was just the sheer number of Chinese poems out there, and the fact that every poet had such a different style,' said Mei. 'We had to figure out how accurate the poets were being. Some might have been really focused on realism, describing what they saw as objectively as possible. Others might have been more imaginative, exaggerating the size or behavior of things they saw. So, once we found these poems, we had to research each poet's life and writing style to make sure the information we were getting was reliable.' The team contextualized the porpoise references in the poems and compared them with historical records of the poet's life events. This helped them pinpoint the chronological time and geographic location of the porpoise sightings. The results showed that the Qing Dynasty (1636 to 1912 CE) had over half of the total porpoise poetry, with 477 poems mentioning the Yangtze finless porpoise. The Ming Dynasty (1368 to 1644 CE) came in second with 177 poems, followed by the Song Dynasty (960 to 1279 CE) with 38 and the Yuan Dynasty (1271 to 1368 CE) with 27. The Tang Dynasty (618 to 907 CE) had only five poems. Next, the team used the information in the poems to reconstruct the porpoise's distribution in the river over time. The sharpest habitat-range decrease occurred over the past century—between the Qing dynasty and modern times. The porpoise's range throughout the main part of the river has decreased by 33 percent since the Tang Dynasty. The porpoises' range among the tributaries and lakes that the Yangtze feeds into has also decreased by 91 percent. The sharp decline over the past 100 years aligns with previous studies. That research attributed this drop to human changes to the Yangtze River–especially hydraulic engineering projects. The river is home to the largest hydroelectric facility in the world–Three Gorges–among numerous other projects that generate electricity, but can disrupt the river's flow. Additionally, dam constructions during the 1950s blocked off their movement from the river's mainstream and is likely why they disappeared from the Yangtze's lakes and tributaries. In just the past few decades, two other species endemic to the Yangtze—the baiji dolphin (Lipotes vexillifer) and the Chinese paddlefish (Psephurus gladius)—have gone functionally extinct in the area, likely due to the same habitat changes. [ Related: Eavesdropping on pink river dolphins could help save them. ] 'Protecting nature isn't just the responsibility of modern science; it's also deeply connected to our culture and history,' says Mei. 'Art, like poetry, can really spark an emotional connection, making people realize the harmony and respect we should have between people and nature.' In future research, the team plans to go back into the poems that they've collected to see what they can find about what the river looked like, how large the pods of porpoise used to be, and how they might have behaved. They hope that this work can eventually help today's Yangtze finless porpoise population recover and inspire more scientists to use poetry, novels, paintings, and other historical art forms to gain ecological insights. 'This work made me rethink the scientific value of historical literature and showed us the power of thinking across disciplines,' said Mei. 'Chinese poetry, this ancient art form, can be a serious scientific tool. Using the past to understand the present, 'decoding' the stories behind the art: it's not just research, it's like having a conversation with the poets of the past.'
