Login
Enlarge (credit: A. Martin UW Photography)
Nine brains, blue blood, instant camouflage: It’s no surprise that octopuses capture our interest and our imaginations. Science-fiction creators, in particular, have been inspired by these tentacled creatures.
An octopus's remarkable intelligence makes it a unique subject for marine biologists and neuroscientists as well. Research has revealed the brain power of the octopus allows it to unscrew a jar or navigate a maze. But, like many children, the octopus also develops an impish tendency to push the boundaries of behavior. Several aquariums have found octopuses memorizing guard schedules to sneak into nearby tanks to steal fish; meanwhile, marine biologists have discovered that wild octopuses will punch fish… for no apparent reason.
According to Dr. Jennifer Maher, a professor at the University of Lethbridge in Canada, there are a “number of [different] types of learning [for octopuses]: cognitive tasks like tool use, memory of complex operations for future use, and observational learning.”
Enlarge (credit: Beth Zaiken)
An international team of scientists has published the results of their research into 23 woolly mammoth genomes in Current Biology. As of today, we have even more tantalizing insights into their evolution, including indications that, while the woolly mammoth was already predisposed to life in a cold environment, it continued to make further adaptations throughout its existence.
Years of research, as well as multiple woolly mammoth specimens, enabled the team to build a better picture of how this species adapted to the cold tundra it called home. Perhaps most significantly, they included a genome they had previously sequenced from a woolly mammoth that lived 700,000 years ago, around the time its species initially branched off from other types of mammoth. Ultimately, the team compared that to a remarkable 51 genomes—16 of which are new woolly mammoth genomes: the aforementioned genome from Chukochya, 22 woolly mammoth genomes from the Late Quaternary, one genome of an American mastodon (a relative of mammoths), and 28 genomes from extant Asian and African elephants.
From that dataset, they were able to find more than 3,000 genes specific to the woolly mammoth. And from there, they focused on genes where all the woolly mammoths carried sequences that altered the protein compared to the version found in their relatives. In other words, genes where changes appear to have been naturally selected.
“I have invented a new way of imitating flowers,” Mary Delany, a 72-year-old widow wrote to her niece in 1772 from the grand home where she was a frequent guest, having just captured her hostess’ geranium’s likeness, by collaging cut paper in a nearly identical shade.
Novelty rekindled the creative fire her husband’s death had dampened.
Former pursuits such as needlework, silhouette cut outs, and shell decorating went by the wayside as she dedicated herself fully to her botanical-themed “paper mosaicks.”
Over the next decade Mrs. Delany produced 985 astonishingly floral representations from meticulously cut, hand colored tissue, which she glued to hand painted black backings, and labeled with the specimens’ taxonomic and common names, as well as a collection of numbers, date and provenance.
In the beginning, she took inspiration from a giant collection of botanical specimens amassed by the celebrated botanist Sir Joseph Banks, with whom she became acquainted while spending summers at Bulstrode, the Buckinghamshire estate of her friend Margaret Bentinck, duchess of Portland and a fellow enthusiast of the natural world.
Bulstrode also provided her with abundant source material. The estate boasted botanic, flower, kitchen, ancient and American gardens, as well a staff botanist, the Swedish naturalist Daniel Solander charged with cataloguing their contents according to the Linnaean system.
Sir Joseph Banks commended Mrs. Delany’s powers of observation, declaring her assemblages “the only imitations of nature” from which he “could venture to describe botanically any plant without the least fear of committing an error.”
They also succeed as art.
Molly Peacock, author of The Paper Garden: An Artist Begins Her Life’s Work at 72, appears quite overcome by Mrs. Delany’s Passiflora laurifolia – more commonly known as water lemon, Jamaican honeysuckle or vinegar pear:
The main flower head … is so intensely public that it’s as if you’ve come upon a nude stody. She splays out approximately 230 shockingly vulvular purplish pink petals in the bloom, and inside the leaves she places the slenderest of ivory veins also cut separately from paper, with vine tendrils finer that a girl’s hair. It is so fresh that it looks wet and full of desire, yet the Passiflora is dull and matte
Mrs. Delany’s exquisitely rendered paper flowers became high society sensations, fetching her no small amount of invitations from titled hosts and hostesses, clamoring for specimens from their gardens to be immortalized in her growing Flora Delanica.
She also received donations of exotic plants at Balstrode, where greenhouses kept non-native plants alive, as she gleefully informed her niece in a 1777 letter, shortly after completing her work:
I am so plentifully supplied with the hothouse here, and from the Queen’s garden at Kew, that natural plants have been a good deal laid aside this year for foreigners, but not less in favour. O! How I long to show you the progress I have made.
Her work was in such demand, that she streamlined her creation process from necessity, coloring paper in batches, and working on several pieces simultaneously.
Her failing eyesight forced her to stop just shy of her goal of one thousand flowers.
She dedicated the ten volumes of Flora Delanica to her friend, the duchess of Portland, mistress of Balstrode “(whose) approbation was such a sanction to my undertaking, as made it appear of consequence and gave me courage to go on with confidence.”
She also reflected on the great undertaking of her seventh decade in a poem:
Hail to the happy hour! When fancy led
My pensive mind this flow’ry path to tread;
And gave me emulation to presume
With timid art to trace fair Nature’s bloom.
Explore The British Museum’s interactive archive of Mary Delany’s botanical paper collages here.
All images © The Trustees of the British Museum, republished under a Creative Commons license.
Related Content
Two Million Wondrous Nature Illustrations Put Online by The Biodiversity Heritage Library
A Beautiful 1897 Illustrated Book Shows How Flowers Become Art Nouveau Designs
– Ayun Halliday is the Chief Primatologist of the East Village Inky zine and author, most recently, of Creative, Not Famous: The Small Potato Manifesto and Creative, Not Famous Activity Book. Follow her @AyunHalliday.
Researchers understand the structure of brains and have mapped them out in some detail, but they still don't know exactly how they process data — for that, a detailed "circuit map" of the brain is needed.
Now, scientists have created just such a map for the most advanced creature yet: a fruit fly larva. Called a connectome, it diagrams the insect's 3016 neurons and 548,000 synapses, Neuroscience News has reported. The map will help researchers study better understand how the brains of both insects and animals control behavior, learning, body functions and more. The work may even inspired improved AI networks.
"Up until this point, we’ve not seen the structure of any brain except of the roundworm C. elegans, the tadpole of a low chordate, and the larva of a marine annelid, all of which have several hundred neurons," said professor Marta Zlatic from the MRC Laboratory of Molecular Biology. "This means neuroscience has been mostly operating without circuit maps. Without knowing the structure of a brain, we’re guessing on the way computations are implemented. But now, we can start gaining a mechanistic understanding of how the brain works."
To build the map, the team scanned thousands of slices from the larva's brain with an electron microscope, then integrated those into a detailed map, annotating all the neural connections. From there, they used computational tools to identify likely information flow pathways and types of "circuit motifs" in the insect's brain. They even noticed that some structural features closely resembled state-of-the-art deep learning architecture.
Scientists have made detailed maps of the brain of a fruit fly, which is far more complex than a fruit fly larva. However, these maps don't include all the detailed connections required to have a true circuit map of their brains.
As a next step, the team will investigate the structures used for behavioural functions like learning and decision making, and examine connectome activity while the insect does specific activities. And while a fruit fly larva is a simple insect, the researchers expect to see similar patterns in other animals. "In the same way that genes are conserved across the animal kingdom, I think that the basic circuit motifs that implement these fundamental behaviours will also be conserved," said Zlatic.
This article originally appeared on Engadget at https://www.engadget.com/scientists-create-the-most-complex-map-yet-of-an-insect-brains-wiring-085600210.html?src=rss
Neuron system
System of neurons with glowing connections on black background
Enlarge / Asian woman with protective face mask using smartphone while commuting in the urban bridge in city against crowd of people (credit: d3sign via Getty Images)
On March 28, 2020, as COVID-19 cases began to shut down public life in much of the United States, then-Surgeon General Jerome Adams issued an advisory on Twitter: The general public should not wear masks. “There is scant or conflicting evidence they benefit individual wearers in a meaningful way,” he wrote.
Adams’ advice was in line with messages from other US officials and the World Health Organization. Days later, though, US public health leaders shifted course. Mask-wearing was soon a pandemic-control strategy worldwide, but whether this strategy succeeded is now a matter of heated debate—particularly after a major new analysis, released in January, seemed to conclude that masks remain an unproven strategy for curbing transmission of COVID-19 and other respiratory viruses.
“There’s still no evidence that masks are effective during a pandemic,” the study’s lead author, physician, and epidemiologist Tom Jefferson, recently told an interviewer.
Enlarge (credit: VICTOR de SCHWANBERG/SCIENCE PHOTO LIBRARY)
Psychedelic drugs are often used for entertainment purposes. But there have been some recent indications that they can be effective against PTSD and treatment-resistant depression. Figuring out whether these substances work as medicinal drugs can be challenging because (as one researcher helpfully pointed out) it's difficult to do a controlled experiment when it's easy to figure out who's in the treatment group. Still, we've made some progress in understanding what's happening with psychedelics at the molecular level.
Many psychedelics seem to bind to a specific receptor for the neural-signaling molecule serotonin, activating it. That would seem to make sense for antidepressive effects, given that many popular antidepressants also alter serotonin signaling (such as in SSRIs, or selective serotonin reuptake inhibitors). But SSRIs don't produce any of the mind-altering effects that drive non-medical interest in psychedelics, so things remain a bit confusing.
New data suggests that psychedelics may activate serotonin signaling in a very different way than serotonin itself can, reaching the receptors in parts of the cell that serotonin can't get to.
Care to take a guess what your smart phone has in common with Paleolithic cave paintings of Lascaux, Chauvet and Altamira?
Both can be used to track fertility.
Admittedly, you’re probably not using your phone to stay atop the reproductive cycles of reindeer, salmon, and birds, but such information was of critical interest to our hunter-gatherer ancestors.
Knowing how crucial an understanding of animal behavior would have been to early humans led London-based furniture conservator Ben Bacon to reconsider what purpose might have been served by non-figurative markings – slashes, dots, and Y-shapes – on the cave walls’ 20,000-year-old images.
Their meaning had long eluded esteemed professionals. The marks seemed likely to be numeric, but to what end?
Bacon put forward that they documented animal lives, using a lunar calendar.
The amateur researcher assembled a team that included experts from the fields of mathematics, archeology, and psychology, who analyzed the data, compared it to the seasonal behaviors of modern animals, and agreed that the numbers represented by the dots and slashes are not cardinal, but rather an ordinal representation of months.
As Bacon told All Things Considered his fellow self-taught anthropological researcher, science journalist Alexander Marshack, came close to cracking the code in the 1970s:
… but he wasn’t actually able to demonstrate the system because he thought that these individual lines were days. What we did is we said, actually, they’re months because a hunter-gatherer doesn’t need to know what day a reindeer migrates. They need to know what month the reindeer migrates. And once you use these months units, this whole system responds very, very well to that.
As to the frequently occurring symbol that resembles a Y, it indicates the months in which various female animal birthed their young. Bacon and his team theorize in the Cambridge Archeological Journal that this mark may even constitute “the first known example of an ‘action‘ word, i.e. a verb (‘to give birth’).
Taken together, the cave paintings and non-figurative markings tell an age-old circular tale of the migration, birthing and mating of aurochs, birds, bison, caprids, cervids, fish, horses, mammoths, and rhinos … and like snakes and wolverines, too, though they were excluded from the study on basis of “exceptionally low numbers.”
Early humans were able to log months by observing the moon, but how could they tell when a new year had begun, essential information for anyone seeking to arrange their lives around their prey’s previously documented activities?
Bacon and his peers, like so many poets and farmers, look to the rites of spring:
The obvious event is the so-called ‘bonne saison’, a French zooarchaeological term for the time at the end of winter when rivers unfreeze, the snow melts, and the landscape begins to green.
Read the conclusions of their study here.
Related Content
Algerian Cave Paintings Suggest Humans Did Magic Mushrooms 9,000 Years Ago
Was a 32,000-Year-Old Cave Painting the Earliest Form of Cinema?
40,000-Year-Old Symbols Found in Caves Worldwide May Be the Earliest Written Language
– Ayun Halliday is the Chief Primatologist of the East Village Inky zine and author, most recently, of Creative, Not Famous: The Small Potato Manifesto and Creative, Not Famous Activity Book. Follow her @AyunHalliday.
Enlarge / Kittens engage more frequently in reciprocal wrestling ("play-fighting") compared to adult cats, a new study found. (credit: Getty Images)
Anyone with more than one cat in the house knows that the occasional spat or outright cat fight is going to happen. But sometimes it can be tricky to determine whether cats are fighting or just playing rough, because the interaction could feature trademark behaviors of both, according to a recent paper published in the journal Scientific Reports. It's even more challenging to tell whether the fight is just a squabble or a sign that the cats simply can't get along, thereby forcing hard decisions about how to separate the cats—or even whether it's possible to keep the cat(s) in question.
In 2021, co-author Noema Gajdoš‑Kmecová, a veterinarian with the University of Veterinary Medicine and Pharmacy in Košice, Slovakia, and several colleagues published a review paper proposing the development of a common terminology and more of a "psychobiological" approach to the study of cat behavior—particularly when it comes to play behavior. Past studies had focused on a cat's play activity, such as whether it was playing with a toy or another cat. But such observation yields little insight into the function of such play and, by extension, a cat's motives or emotional state.
"When one cat treats another as an object or prey, such activity relates to the former cat seeking to learn about its own skills in relation to manipulating its physical environment (prey are not considered part of the complex social relationships and thus social environment of an individual)," they wrote in that paper. "However, when interaction between cats is reciprocal it may function to facilitate social learning and may be best described as mutual social play." Because such interactions are dynamic, they argued that any functional classification system must be flexible enough to account for such nuances.
Enlarge / The Nicobar pigeon, the dodo's closest living relative, is quite a bit smaller and capable of flight. (credit: Samuel Hambly / EyeEm)
Colossal is a company that got its start with a splashy announcement about plans to do something that many scientists consider impossible with current technology, all in the service of creating a product with no clear market potential: the woolly mammoth. Since that time, the company has settled into a potentially viable business model and set its sights on a species where the biology is far more favorable: the thylacine, a marsupial predator that went extinct in the early 1900s.
Today, the company is announcing a third de-extinction target and its return to the realm of awkward reproductive biology that will force the project to clear many technical hurdles: It hopes to bring back the dodo.
The dodo was a large (up to 1 meter tall), flightless bird that evolved on the island of Mauritius in the Indian Ocean. As European sailors reached the islands, it quickly became a source of food for them and the invasive species that accompanied them. It went extinct within a century of the first descriptions reaching Europe.
Enlarge (credit: Robert Trevis-Smith)
It's pretty easy to link humans' intelligence to our success as a species. Things like agriculture, building cities, and surviving in harsh environments require a large collection of mental skills, from good memory to the ability to communicate and work together. But it's often less clear what role intelligence plays in species with less obvious mental capabilities. In many cases, it's hard to even measure mental capacities; in other cases, it's hard to guess which capacities might improve survival.
A new study looks at a bird species that doesn't have much of a reputation for braininess: the pheasant. But the researchers behind the study find that pheasants have substantial differences in spatial thinking, and some aspects of that spatial capacity make a difference when the birds are released into the wild. Those birds that do well with navigating a complex maze adopted a larger home territory and did better at avoiding being eaten. And, almost as an accident, the study finds that the birds tend to get eaten more often when they wander out of familiar territory.
Parrots and corvids have reputations as the brainiacs of the bird world. Pheasants, not so much. But they do have advantages for the study of mental abilities. They're easy to raise in captivity, where they can be given various tests, and will adjust easily if released into the wild. They're also big enough that it's easy to attach tracking devices to see what they're doing after they've been released.
Swiss scientists have developed a proof-of-concept method to collect environmental DNA (eDNA) from high-arching forest canopies, an under-observed habitat. Rather than hiring skilled climbers to risk their lives to grab a little bug and bird DNA, the team flew a collection drone into the trees to capture genetic material — giving them a clearer picture of the area’s organic breakdown.
The researchers used a quadcopter equipped with a sticky collection cage. But since tree branches can bend at the slightest touch — and the drone needs to touch the branches to collect DNA — it has a haptic-based control scheme using force sensors to measure the pressure between the drone and the branch. Then, it adjusts its landing accordingly, leaning against the branch gently enough to avoid flinging valuable material to the ground.
The drone’s cage then grabs samples with a sticky surface made from “adhesive tape and a cotton gauze humidified with a solution of water and DNA-free sugar.” The cage spends around 10 seconds leaning on each branch and collecting eDNA before zipping back to the base, where the scientists retrieve the samples and ship them to a lab. The experiment’s drone successfully collected enough genetic material to identify 21 animal classes ranging from insects and mammals to birds and amphibians.
However, the scientists make it clear this is a work in progress. For example, on the last research day, the team noticed a drop in eDNA detection because of rainfall the night before — suggesting the method only tells them which creatures visited since the last downpour. Additionally, they noted unexplained differences in the performance of their two collectors, highlighting the need for more research on equipment variations.
The researchers hope their work will make it easier and cheaper for environmental biologists to learn which critters live in some of the hardest-to-reach places. The approach could eventually help the scientific community understand how environmental changes affect biodiversity, perhaps helping identify endangered or vulnerable species before it’s too late.
eDNA-collecting drone
Photo of a drone designed to collect eDNA from hard-to-reach tree branches. It has an attached sticky cage and is leaning against a pine tree branch.
In 2011, a horticulturist named Mathias Maier stumbled across an unusual mutant of a Venus flytrap, a carnivorous plant that traps and feeds on insects. Scientists recently discovered that the typical Venus flytrap can actually "count" to five, sparking further research on how the plant manages this remarkable feat. The mutant flytrap might hold the key. According to a new paper published in the journal Current Biology, this mutant flytrap doesn't snap closed in response to stimulation like typical Venus flytraps.
"This mutant has obviously forgotten how to count, which is why I named it Dyscalculia (DYSC)," said co-author Rainer Hedrich, a biophysicist at Julius-Maximilians-Universität Würzburg (JMU) in Bavaria, Germany. (It had previously been called "ERROR.")
As we've reported previously, the Venus flytrap attracts its prey with a pleasing fruity scent. When an insect lands on a leaf, it stimulates the highly sensitive trigger hairs that line the leaf. When the pressure becomes strong enough to bend those hairs, the plant will snap its leaves shut and trap the insect inside. Long cilia grab and hold the insect in place, much like fingers, as the plant begins to secrete digestive juices. The insect is digested slowly over five to 12 days, after which the trap reopens, releasing the dried-out husk of the insect into the wind.
Enlarge (credit: Larry Washburn)
Jianhua Guo is a professor at the Australian Centre for Water and Environmental Biotechnology. His research focuses on removing contaminants from wastewater and the environmental dimensions of antimicrobial resistance. One of those dimensions is the overuse of antibiotics, which promotes resistance to these drugs.
Guo wondered if the same might hold true for other types of pharmaceuticals as well. His lab found that they definitely do. Specific antidepressants—SSRIs and SNRIs—promote resistance to different classes of antibiotics. This resistance is heritable over 33 bacterial generations, even once the antidepressant is removed.
Antidepressants are among the most prescribed and ingested drugs there are. They account for roughly 5 percent of the pharmaceutical market share—about the same as antibiotics—and four of the top 10 most prescribed psychiatric meds in the US.
Enlarge (credit: Royal Tyrrell Museum of Palaeontology)
Borealopelta markmitchelli found its way back into the sunlight in 2017, millions of years after it had died. This armored dinosaur is so magnificently preserved that we can see what it looked like in life. Almost the entire animal—the skin, the armor that coats its skin, the spikes along its side, most of its body and feet, even its face—survived fossilization. It is, according to Dr. Donald Henderson, curator of dinosaurs at the Royal Tyrrell Museum, a one-in-a-billion find.
Beyond its remarkable preservation, this dinosaur is an important key to understanding aspects of Early Cretaceous ecology, and it shows how this species may have lived within its environment. Since its remains were discovered, scientists have studied its anatomy, its armor, and even what it ate in its last days, uncovering new and unexpected insight into an animal that went extinct approximately 100 million years ago.
Borealopelta is a nodosaur, a type of four-legged ankylosaur with a straight tail rather than a tail club. Its finding in 2011 in an ancient marine environment was a surprise, as the animal was terrestrial.
Enlarge / Chicken eggs are disposed of at a quarantined farm in Israel's northern Moshav (village) of Margaliot on January 3, 2022. (credit: Getty | JALAA MAREY / AFP))
The ongoing bird flu outbreak in the US is now the longest and deadliest on record. More than 57 million birds have been killed by the virus or culled since a year ago, and the deadly disruption has helped propel skyrocketing egg prices and a spike in egg smuggling.
Since highly pathogenic avian influenza (HPAI) A(H5N1) was first detected in US birds in January 2022, the price of a carton of a dozen eggs has shot up from an average of about $1.79 in December 2021 to $4.25 in December 2022, a 137 percent increase, according to data from the US Bureau of Labor Statistics. Although inflation and supply chain issues partly explain the rise, eggs saw the largest percentage increase of any specific food, according to the consumer price index.
And the steep pricing is leading some at the US-Mexico border to try to smuggle in illegal cartons, which is prohibited. A US Customs and Border Protection spokesperson told NPR this week that people in El Paso, Texas, are buying eggs in Juárez, Mexico, because they are "significantly less expensive." Meanwhile, a customs official in San Diego tweeted a reminder amid a rise in egg interceptions that failure to declare such agriculture items at a port of entry can result in penalties up to $10,000.
Enlarge / HBO's The Last of Us provides a vivid visual imagining of what a Cordyceps infected human might become. (credit: YouTube/HBO Max)
HBO's new sci-fi series The Last of Us debuted earlier this week and is already a massive hit. Based on the critically acclaimed video game of the same name, the series takes place in the 20-year aftermath of a deadly outbreak of mutant fungus that turns humans into monstrous zombie-like creatures (the Infected, or Clickers). While the premise is entirely fictional, it's based on some very real, and fascinating, science.
(Minor spoilers for the series below.)
The first episode showed us the initial outbreak and devastation. Fast-forward 20 years, and the world has become a series of separate totalitarian quarantine zones and independent settlements, with a thriving black market and a rebel militia, known as the Fireflies, making life complicated for the survivors. A hardened smuggler named Joel (Pedro Pascal) is tasked with escorting a teenage girl named Ellie (Bella Ramsey) across the devastated US, battling hostile forces and hordes of zombies, to a Fireflies unit outside the quarantine zone. Ellie is special: She is immune to the deadly fungus, and the hope is that her immunity holds the key to beating the disease.
Enlarge / Oyster mushrooms (Pleurotus ostreatus) serenely growing on a tree trunk in a forest. But nematodes beware! These oyster mushrooms want to eat you—and they have evolved a novel mechanism for paralyzing and killing you. (credit: Arterra/Getty Images)
The oyster mushroom (Pleurotus ostreatus) is a staple of many kinds of cuisine, prized for its mild flavors and a scent vaguely hinting at anise. These cream-colored mushrooms are also one of several types of carnivorous fungi that prey on nematodes (roundworms) in particular. The mushrooms have evolved a novel mechanism for paralyzing and killing its nematode prey: a toxin contained within lollipop-like structures called toxocysts that, when emitted, cause widespread cell death in roundworms within minutes. Scientists have now identified the specific volatile organic compound responsible for this effect, according to a new paper published in the journal Science Advances.
Carnivorous fungi like the oyster mushroom feed on nematodes because these little creatures are plentiful in soil and provide a handy protein source. Different species have evolved various mechanisms for hunting and consuming their prey. For instance, oomycetes are fungus-like organisms that send out "hunter cells" to search for nematodes. Once they find them, they form cysts near the mouth or anus of the roundworms and then inject themselves into the worms to attack the internal organs. Another group of oomycetes uses cells that behave like prey-seeking harpoons, injecting the fungal spores into the worm to seal its fate.
Other fungi produce spores with irritating shapes like stickles or stilettos. The nematodes swallow the spores, which get caught in the esophagus and germinate by puncturing the worm's gut. There are sticky branch-like structures that act like superglue; death collars that detach when nematodes swim through them, injecting themselves into the worms; and a dozen or so fungal species employ snares that constrict in under a second, squeezing the nematodes to death.
FreshRSS 
