Upside-down jellyfish release tiny balls of stinging cells that can move through water on their own and survive for days – leaving a network of mucus that can sting you

Watching brain activity in fish as they try to “swim” in virtual reality helps us understand their perception abilities and how they interact with other animals

The bell of an upside-down jellyfish has structures that can provide a scaffold for growing human skin cells, which could be used to help repair wounds after surgery or a bad burn

The Tully Monster is a famously odd 300-million-year-old fossil that looks like an alien, but a new analysis suggests it was a backboned animal like a hagfish or lamprey

Some dividend fund managers are wading back into the shares of battered railroad stocks, energy companies and other economically sensitive, cyclical names, even as a host of companies have slashed...

Ocean Outbreak unveils the little-known diseases wreaking havoc in the seas and the book does a first-rate job of inspiring readers at the same time

As a changing climate dried out the Sahara desert, ancient humans transitioned from eating lots of tilapia and catfish to more mammal-heavy meals

West Africa's waters are a hotspot for illegal fishing, says conservationist Justine Dossa. She is working to change fishing practices and tackle pollution

It can be difficult for doctors to assess the level of consciousness in people who have had serious brain injuries, but observing their reaction to strong odours may help

The Tully Monster is a famously odd 300-million-year-old fossil that looks like an alien, but a new analysis suggests it was a backboned animal like a hagfish or lamprey

A small increase in water temperature near a Japanese nuclear power plant allowed tropical fish to colonise the area, suggesting global warming will drastically alter some marine ecosystems

Title: Fish Oil Doesn't Cut Failure Rate of Hemodialysis Grafts
Category: Health News
Created: 5/1/2012 6:05:00 PM
Last Editorial Review: 5/2/2012 12:00:00 AM

Title: Fish, Flaxseed May Lower Alzheimer's Risk
Category: Health News
Created: 5/3/2012 11:01:00 AM
Last Editorial Review: 5/3/2012 12:00:00 AM

Title: Omega-3 Fish Oil Supplements Might Boost Antidepressants' Effects
Category: Health News
Created: 4/26/2016 12:00:00 AM
Last Editorial Review: 4/27/2016 12:00:00 AM

Title: Heat Beats Cold for Treating Jellyfish Stings
Category: Health News
Created: 4/29/2016 12:00:00 AM
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Title: Eating Fish in Moderation During Pregnancy Benefits Fetus: Study
Category: Health News
Created: 3/20/2020 12:00:00 AM
Last Editorial Review: 3/23/2020 12:00:00 AM

Ayelen M. Blanco, Juan I. Bertucci, Jose L. Soengas, and Suraj Unniappan

This research assessed the direct effects of insulin on nutrient-sensing mechanisms in the brain of rainbow trout (Oncorhynchus mykiss) using an in vitro approach. Cultured hypothalamus and hindbrain were exposed to 1 µmol l^–1 insulin for 3 h, and signals involved in appetite regulation and nutrient-sensing mechanisms were measured. Additionally, the involvement of the phosphatidylinositide 3-kinase (PI3K)/protein kinase B (Akt) signaling pathway in the actions of insulin was studied by using the inhibitor wortmannin. Treatment with insulin alone did not elicit many changes in the appetite regulators and nutrient-sensing-related genes and enzymes tested in the hypothalamus and hindbrain. However, we found that, when insulin and nutrients were added together, insulin reversed most of the effects exerted by nutrients alone, suggesting that insulin changes responsiveness to nutrients at the central level. Effects reversed by insulin included expression levels of genes related to the sensing of both glucose (slc2a2, slc5a1, gck, pck1, pklr, g6pcb, gys1, tas1r3 and nr1h3 in the hindbrain, and slc2a2, pklr and pck1 in the hypothalamus) and fatty acid (cd36 in the hindbrain, and cd36 and acly in the hypothalamus). Nutrient-induced changes in the activity of Acly and Cpt-1 in the hindbrain and of Pepck, Acly, Fas and Hoad in the hypothalamus were also reversed by insulin. Most of the insulin effects disappeared in the presence of wortmannin, suggesting the PI3K/Akt pathway is a mediator of the effects of insulin reported here. This study adds new information to our knowledge of the mechanisms regulating nutrient sensing in fish.

Karen L. Carleton, Daniel Escobar-Camacho, Sara M. Stieb, Fabio Cortesi, and N. Justin Marshall

Among vertebrates, teleost eye diversity exceeds that found in all other groups. Their spectral sensitivities range from ultraviolet to red, and the number of visual pigments varies from 1 to over 40. This variation is correlated with the different ecologies and life histories of fish species, including their variable aquatic habitats: murky lakes, clear oceans, deep seas and turbulent rivers. These ecotopes often change with the season, but fish may also migrate between ecotopes diurnally, seasonally or ontogenetically. To survive in these variable light habitats, fish visual systems have evolved a suite of mechanisms that modulate spectral sensitivities on a range of timescales. These mechanisms include: (1) optical media that filter light, (2) variations in photoreceptor type and size to vary absorbance and sensitivity, and (3) changes in photoreceptor visual pigments to optimize peak sensitivity. The visual pigment changes can result from changes in chromophore or changes to the opsin. Opsin variation results from changes in opsin sequence, opsin expression or co-expression, and opsin gene duplications and losses. Here, we review visual diversity in a number of teleost groups where the structural and molecular mechanisms underlying their spectral sensitivities have been relatively well determined. Although we document considerable variability, this alone does not imply functional difference per se. We therefore highlight the need for more studies that examine species with known sensitivity differences, emphasizing behavioral experiments to test whether such differences actually matter in the execution of visual tasks that are relevant to the fish.

Jonathan M. Whittamore

Oxalate is a common constituent of kidney stones but the mechanism of its transport across epithelia are not well understood. With prior research on the role of the intestine focused on mammals this study considered oxalate handling by teleost fish. Given the osmotic challenge of seawater (SW), teleosts have limited scope for urinary oxalate excretion relative to freshwater (FW). The marine teleost intestine was hypothesized as the principal route for oxalate elimination thus demanding epithelial secretion. To test this, intestinal ¹⁴C-oxalate flux was compared between FW- and SW-acclimated sailfin molly (Poecilia latipinna). In SW, oxalate was secreted at remarkable rates (367.90±22.95 pmol cm^–2 h^–1) which were similar following FW transfer (387.59±27.82 pmol cm^–2 h^–1), implying no regulation by salinity. Nevertheless, this ability to secrete oxalate 15-19 times higher than mammalian small intestine supports this proposal of the teleost gut as a previously unrecognized excretory pathway.

Krishnamoorthy Krishnan, Asif Shahriar Nafi, Roi Gurka, and Roi Holzman

Fish larvae are the smallest self-sustaining vertebrates. As such, they face multiple challenges that stem from their minute size, and from the hydrodynamic regime in which they dwell. This regime, of intermediate Reynolds numbers, was shown to affect the swimming of larval fish and impede their ability to capture prey. Prey capture is impeded because smaller larvae produce weaker suction flows, exerting weaker forces on the prey. Previous observations on feeding larvae also showed prey exiting the mouth after initially entering it (hereafter "in-and-out"), although the mechanism causing such failures had been unclear. In this study, we used numerical simulations to investigate the hydrodynamic mechanisms responsible for the failure to feed caused by this in-and-out prey movement. Detailed kinematics of the expanding mouth during prey capture by larval Sparus aurata were used to parameterize age-specific numerical models of the flows inside the mouth. These models revealed that for small larvae which expand their mouth slowly, fluid entering the mouth cavity is expelled through the mouth before it is closed, resulting in flow reversal at the orifice. This relative efflux of water through the mouth was >8% of the influx through the mouth for younger ages. However similar effluxes were found when we simulated slow strikes by larger fish. The simulations can explain the observations of larval fish failing to fish due to the in-and-out movement of the prey. These results further highlight the importance of transporting the prey from the gape deeper into the mouth cavity in determining suction-feeding success.

Lewis C. Naisbett-Jones, Nathan F. Putman, Michelle M. Scanlan, David L. G. Noakes, and Kenneth J. Lohmann

A variety of animals sense Earth's magnetic field and use it to guide movements over a wide range of spatial scales. Little is known, however, about the mechanisms that underlie magnetic field detection. Among teleost fish, growing evidence suggests that crystals of the mineral magnetite provide the physical basis of the magnetic sense. In this study, juvenile Chinook salmon (Oncorhynchus tshawytscha) were exposed to a brief but strong magnetic pulse capable of altering the magnetic dipole moment of biogenic magnetite. Orientation behaviour of pulsed fish and untreated control fish was then compared in a magnetic coil system under two conditions: (1) the local magnetic field; and (2) a magnetic field that exists near the southern boundary of the natural oceanic range of Chinook salmon. In the local field, no significant difference existed between the orientation of the control and pulsed groups. By contrast, orientation of the two groups was significantly different in the magnetic field from the distant site. These results demonstrate that a magnetic pulse can alter the magnetic orientation behaviour of a fish and are consistent with the hypothesis that salmon have magnetite-based magnetoreception.

Noemie Liesch and Friedrich Ladich

In vocal fish species, males possess larger sound-generating organs and signal acoustically with pronounced sex-specific differences. Sound production is known in two out of three species of croaking gouramis (Trichopsis vittata and T. schalleri). The present study investigates sex-specific differences in sonic organs, vocalizing behaviour and sounds emitted in the third species, the pygmy gourami T. pumila, in order to test the hypothesis that females are able to vocalize despite their less-developed sonic organs, and despite contradictory reports. Croaking gouramis stretch and pluck two enhanced (sonic) pectoral fin tendons during alternate fin beating, resulting in a series of double-pulsed bursts termed croaking sound. We measured the diameter of the first and second sonic tendon and showed that male tendons were twice as large as in same-sized females. We also determined the duration of dyadic contests, visual displays, number of sounds and buttings. Sexes differ in all sound characteristics but in no behavioural variable. Male sounds consisted of twice as many bursts, a higher percentage of double-pulsed bursts and a higher burst period. Additionally, male sounds had a lower dominant frequency and a higher sound level. In summary, female pygmy gouramis possessed sonic organs and vocalized in most dyadic contests. The sexual dimorphism in sonic tendons is clearly reflected in sex-specific differences in sound characteristics, but not in agonistic behaviour, supporting the hypothesis that females are vocal.

S. Ghods, S. Waddell, E. Weller, C. Renteria, H.-Y. Jiang, J. M. Janak, S. S. Mao, T. J. Linley, and D. Arola

Fish scales serve as a dermal armor that provides protection from physical injury. Due to a number of outstanding properties, fish scales are inspiring new concepts for layered engineered materials and next-generation flexible armors. While past efforts have primarily focused on the structure and mechanical behavior of ontogenetic scales, the structure-property relationships of regenerated scales have received limited attention. In the present study, common carp (Cyprinus carpio) acquired from the wild were held live in an aquatic laboratory at 10° and 20°C. Ontogenetic scales were extracted from the fish for analysis, as well as regenerated scales after approximately 1 year of development and growth. Their microstructure was characterized using microscopy and Raman spectroscopy, and the mechanical properties were evaluated in uniaxial tension to failure under hydrated conditions. The strength, strain to fracture and toughness of the regenerated scales were significantly lower than those of ontogenetic scales from the same fish, regardless of the water temperature. Scales that regenerated at 20°C exhibited significantly higher strength, strain to fracture and toughness than those regenerated at 10°C. The regenerated scales exhibited a highly mineralized outer layer, but no distinct limiting layer or external elasmodine; they also possessed a significantly lower number of plies in the basal layer than in the ontogenetic scales. The results suggest that a mineralized layer develops preferentially during scale regeneration with the topology needed for protection, prior to the development of other qualities.

Thomas J. Lisney, Shaun P. Collin, and Jennifer L. Kelley

Ecological factors such as spatial habitat complexity and diet can explain variation in visual morphology, but few studies have sought to determine whether visual specialisation can occur among populations of the same species. We used a small Australian freshwater fish (the western rainbowfish, Melanotaenia australis) to determine whether populations showed variation in eye size and eye position, and whether this variation could be explained by environmental (light availability, turbidity) and ecological (predation risk, habitat complexity, invertebrate abundance) variables. We investigated three aspects of eye morphology, (1) eye size relative to body size, (2) pupil size relative to eye size, and (3) eye position in the head, for fish collected from 14 sites in a major river catchment in northwest Western Australia. We found significant variation among populations in all three measures of eye morphology, but no effect of sex on eye size or eye position. Variation in eye diameter and eye position was best explained by the level of habitat complexity. Specifically, fish occurring in habitats with low complexity (i.e. open water) tended to have smaller, more dorsally-located eyes, than those occurring in more complex habitats (i.e. vegetation present). The size of the pupil relative to the size of the eye was most influenced by the presence of surrounding rock formations; fish living in gorge habitats had significantly smaller pupils (relative to eye size) than those occupying semi-gorge sites or open habitats. Our findings reveal that different ecological and environmental factors contribute to habitat-specific visual specialisations within a species.

Itsumi Nakamura, Rui Matsumoto, and Katsufumi Sato

It is generally assumed that the body temperature of large animals is less likely to change due to their large body size, resulting in a high thermal inertia and a smaller surface area to volume ratio. The goal of this study was to investigate the stability of body temperature in large fish using data from field experiments. We measured the muscle temperatures of free-ranging whale sharks (Rhincodon typus), the largest extant fish globally, and investigated their ectothermic physiology and the stability of their body temperatures. The measured muscle temperature of the whale sharks changed substantially more slowly than the water temperature fluctuations associated with vertical movements, and the whole-body heat-transfer coefficients (HTC) of whale sharks estimated using heat-budget models were lower than those of any other fish species measured to date. The heat-budget models also showed that internal heat production does not contribute to changes in muscle temperature. A comparative analysis showed that the HTC at cooling in various fish species including both ectothermic and endothermic species ranging from 10^–4 to 10³ kg was proportional to body mass^–0.63. This allometry was present regardless of whether the fish were ectothermic or endothermic, and was an extension of the relationship observed in previous studies on small fish. Thus, large fish have the advantage of body temperature stability while moving in environments with large temperature variations. Our results suggest that the large body size of whale sharks aids in preventing a decrease in body temperature during deep excursions to more than 1000 m depths without high metabolic costs of producing heat.

Jorge de Costa, Gustavo Barja, and Pedro F. Almaida-Pagan

Lipid composition of cell membranes is linked to metabolic rate and lifespan in mammals and birds but very little information is available for fishes. In this study, three fish species of the short-lived annual genus Nothobranchius with different maximum lifespan potentials (MLSP) and the longer-lived outgroup species Aphyosemion australe were studied to test whether they conform to the predictions of the longevity-homeoviscous adaptation (LHA) theory of aging. Lipid analyses were performed in whole fish samples and peroxidation indexes (PIn) for every PL class and for the whole membrane, were calculated. Total PL content was significantly lower in A. australe and N. korthausae, the two species with the highest MLSP, and a negative correlation between membrane total PIn and fish MLSP was found, this meaning that the longer-lived fish species have more saturated membranes and therefore, a lower susceptibility to oxidative damage, as the LHA theory posits.

Flemming Dahlke, Magnus Lucassen, Ulf Bickmeyer, Sylke Wohlrab, Velmurugu Puvanendran, Atle Mortensen, Melissa Chierici, Hans-Otto Pörtner, and Daniela Storch

The vulnerability of fish embryos and larvae to environmental factors is often attributed to a lack of adult-like organ systems (gills) and thus insufficient homeostatic capacity. However, experimental data supporting this hypothesis are scarce. Here, by using Atlantic cod (Gadus morhua) as a model, the relationship between embryo vulnerability (to projected ocean acidification and warming) and homeostatic capacity was explored through parallel analyses of stage-specific mortality and in vitro activity and expression of major ion pumps (ATP-Synthase, Na⁺/K⁺-ATPase, H⁺-ATPase) and co-transporters (NBC1, NKCC1). Immunolocalization of these transporters was used to study ionocyte morphology in newly-hatched larvae. Treatment-related embryo mortality until hatch (+20% due to acidification and warming) occurred primarily during an early period (gastrulation) characterized by extremely low ion transport capacities. Thereafter, embryo mortality decreased in parallel with an exponential increase in activity and expression of all investigated ion transporters. Significant changes in transporter activity and expression in response to acidification (+15% activity) and warming (-30% expression) indicate some potential for short-term acclimatization, although likely associated with energetic trade-offs. Interestingly, whole-larvae enzyme capacities (supported by abundant epidermal ionocytes) reached levels similar to those previously measured in gill tissue of adult cod, suggesting that early-life stages without functional gills are better equipped in terms of ion homeostasis than previously thought. This study implies that the gastrulation period represents a critical transition from inherited (maternal) defenses to active homeostatic regulation, which facilitates enhanced resilience of later stages to environmental factors.

Progression from the initial vascular response upon hyperglycemia to a proliferative stage with neovacularizations is the hallmark of proliferative diabetic retinopathy. Here, we report on the novel diabetic pdx1^–/– zebrafish mutant as a model for diabetic retinopathy that lacks the transcription factor pdx1 through CRISPR-Cas9–mediated gene knockout leading to disturbed pancreatic development and hyperglycemia. Larval pdx1^–/– mutants prominently show vasodilation of blood vessels through increased vascular thickness in the hyaloid network as direct developmental precursor of the adult retinal vasculature in zebrafish. In adult pdx1^–/– mutants, impaired glucose homeostasis induces increased hyperbranching and hypersprouting with new vessel formation in the retina and aggravation of the vascular alterations from the larval to the adult stage. Both vascular aspects respond to antiangiogenic and antihyperglycemic pharmacological interventions in the larval stage and are accompanied by alterations in the nitric oxide metabolism. Thus, the pdx1^–/– mutant represents a novel model to study mechanisms of hyperglycemia-induced retinopathy wherein extensive proangiogenic alterations in blood vessel morphology and metabolic alterations underlie the vascular phenotype.

Nayeli G. Reyes-Nava, Hung-Chun Yu, Curtis R. Coughlin II, Tamim H. Shaikh, and Anita M. Quintana

We used whole-exome sequencing (WES) to determine the genetic etiology of a patient with a multi-system disorder characterized by a seizure phenotype. WES identified a heterozygous de novo missense mutation in the GABRA1 gene (c.875C>T). GABRA1 encodes the alpha subunit of the gamma-aminobutyric acid receptor A (GABA_AR). The GABA_AR is a ligand gated ion channel that mediates the fast inhibitory signals of the nervous system, and mutations in the subunits that compose the GABA_AR have been previously associated with human disease. To understand the mechanisms by which GABRA1 regulates brain development, we developed a zebrafish model of gabra1 deficiency. gabra1 expression is restricted to the nervous system and behavioral analysis of morpholino injected larvae suggests that the knockdown of gabra1 results in hypoactivity and defects in the expression of other subunits of the GABA_AR. Expression of the human GABRA1 protein in morphants partially restored the hypomotility phenotype. In contrast, the expression of the c.875C>T variant did not restore these behavioral deficits. Collectively, these results represent a functional approach to understand the mechanisms by which loss-of-function alleles cause disease.

Yuta Sakae, Akira Oikawa, Yuki Sugiura, Masatoshi Mita, Shuhei Nakamura, Toshiya Nishimura, Makoto Suematsu, and Minoru Tanaka

The teleost fish, medaka (Oryzias latipes), employs the XX/XY genetic sex determination system. We show here that the phenotypic sex of medaka is affected by changes in lipid metabolism. Medaka larvae subjected to 5 days of starvation underwent female-to-male sex reversal. Metabolomic and RT-qPCR analyses indicated that pantothenate metabolism was suppressed by starvation. Consistently, inhibiting the pantothenate metabolic pathway caused sex reversal. The final metabolite in this pathway is coenzyme A, an essential factor for lipogenesis. Inhibiting fatty acid synthesis, the first step of lipogenesis, also caused sex reversal. The expression of dmrt1, a critical gene for male development, was suppressed by starvation, and a dmrt1 (13) mutant did not show sex reversal under starvation. Collectively, these results indicate that fatty acid synthesis is involved in female-to-male sex reversal through ectopic expression of male gene dmrt1 under starvation.

Background:

Research on the relationship of meat, fish, and egg consumption and mortality among prostate cancer survivors is limited.

Flexible displays for wearable devices can now be made using fish scales instead of plastic – and the new displays biodegrade within a month of being discarded

Scientists are speculating as to how the two creatures managed to become preserved in such an unusual way.

Goku got moves. Square Enix got the dollar bills. Keanu got a fandom. And you got a really long post E3 podcast. Now go teach those youngsters how the weapon triangle works.

It can be difficult for doctors to assess the level of consciousness in people who have had serious brain injuries, but observing their reaction to strong odours may help

An strange, invasive species of jellyfish in Europe eats its own young when food is low, a new study claims.

The pandemic has left many unable to leave harbor, creating a window for fishing grounds to recover from years of overfishing

In many fish species body size plays an important role in sexual selection. Large individuals are preferred mating partners because they can enhance offspring survival by providing better quality resources than small individuals. While large females and males are often favored by sexual selection, fishing targets and removes these reproductively superior individuals.

The direction of ocean currents can determine the direction of gene flow in rafting species, but this depends on species traits that allow for rafting propensity. This is according to a study focusing on seahorse and pipefish species. And it could explain how high genetic diversity can contribute to extinction in small populations.

Residents of a German town have been using a fishing rod to lift French baguettes over the border amid the coronavirus lockdown.

Researchers say cannibalistic tendency may help explain why the invasive creatures thrive

When the going gets tough, most parents try to protect their offspring. But the warty comb jelly takes a different tack: it eats them.

Despite initial appearances, comb jellies are not jellyfish but belong to a different group of animals, ctenophora, which swim using tiny hair-like projections called cilia.

Humans have proven themselves remarkably adept at learning to do what other animals can do naturally. We have taught ourselves to fly like birds, climb like monkeys and burrow like moles. But the one animal that has always proven beyond our reach is the fish.

Quinn Moreland

The post Carrie Fisher’s Inimitable Voice appeared first on The Nation.

By Nicholas Heather One time, me and the kids had a fish hotel. It was my idea. My original idea. For some reason we’d acquired a 20-gallon fish tank. Of course, the kids wanted to get fish. “I don’t think that’s a good idea, you guys,” I said, as we were discussing what I was […]

What is this pandemic doing to our minds? Polls repeatedly show it’s having an adverse effect on our mental health. Physical distancing, for some, means social isolation, which has long been shown to encourage depression. Previous disasters have been followed by waves of depression, exacerbated by financial distress. The situation also puts us in a state of fear and anxiety—anxiety about financial strain, about being lonely, about the very lives of ourselves and our loved ones.

This fear can also bring out some of the everyday irrationalities we all struggle with. We have trouble thinking about numbers—magnitudes, probabilities, and the like—and when frightened we tend toward absolutes. Feeling powerless makes people more prone to conspiracy theories. We naturally believe that big effects should have big causes, and we see with the current coronavirus, as we did with AIDS and SARS, conspiracy theories claiming that the virus was engineered as a weapon.

We are seeing the theory of “collective resilience,” an informal solidarity among people, in action.

These psychological ramifications can make us fail to behave as well as we should. We have what psychologists call a “behavioral immune system” that makes us behave in ways that, in general, make us less likely to catch infectious disease. Things we perceive as being risky for disease makes us wary. An unfortunate side effect is that it increases prejudice against foreigners, people with visible sores or deformities, and people we perceive as simply being ugly. Politically, this can result in xenophobia and outgroup distrust. Coronavirus-related attacks, possibly encouraged by the misleading term “Chinese virus,” have plagued some ethnic Asian people.

And yet, in spite of all of the harm the pandemic seems to be wreaking on our minds, there are also encouraging acts of kindness and solidarity. In turbulent times, people come together and help each other.

In the days after the World Trade Center fell, it wasn’t just the police, hospitals, and firefighters who came forward to help, it was normal citizens who often put themselves at risk to help other people out. An equities trader named Sandler O’Neill helped rescue a dozen people and then went back to save more. A tour guide at the Pentagon helped victims outside, and then went back in the burning building to help more. We find these kinds of behaviors in every disaster.

During this pandemic, we see the same thing. Some acts are small and thoughtful, such as putting encouraging signs in windows. Others have made games out of window signs, putting up rainbows for children on walks to count. Some show support for health care and other frontline workers, applauding or banging on pots on their balconies and at windows in a nightly ritual. Others are helping in more substantial ways. In the United Kingdom, over half a million people signed up to be a National Health Volunteer, supporting the most vulnerable people, who have to stay home.

John Drury, a professor of social psychology at the University of Sussex, England, who studies people’s behavior in disasters, has seen these acts of kindness in his own neighborhood over the past month. He and his neighbors set up a WhatsApp group to help one another with shopping. “I think that translates across the country and probably across the world,” Drury says. “People are seeing themselves as an us, a new kind of we, based on the situation that we all find ourselves in. You’ve got this idea of common fate, which motivates our care and concern for others.”

We have always been a social species who rely on each other for happiness and our survival.

Drury is the pioneer of a theory known as “collective resilience,” which he describes as “informal solidarity among people in the public.” Drury’s study of the 2005 London bombing disaster found that mutual helping behaviors were more common than selfish ones. This basic finding has been replicated in other disasters, including the crash of the Ghana football stadium and the 2010 earthquake and tsunami in Chile. In disasters, Drury says, people reach heights of community and cooperation they’ve never reached before.

It turns out that being in a dangerous situation with others fosters a new social identity. Boundaries between us, which seem so salient when things are normal, disappear when we perceive we’re locked in a struggle together, with a common fate, from an external threat. People go from me thinking to we thinking. Respondents in studies about disasters often spontaneously bring up this feeling of group cohesion without being asked. The greater unity they felt, the more they helped.

Popular conceptions of how people respond in a crisis involve helplessness, selfishness, and panic. In practice, though, this rarely happens. “One of the reasons people die in emergencies isn’t overreaction, it’s underreaction,” Drury says. “People die in fires mainly because they’re too slow. They underestimate risk.” The myth of panic can lead to emergency policies that do more harm than good. At one point during Hurricane Katrina, Louisiana governor at the time Kathleen Blanco warned looters that National Guard troops “know how to shoot and kill, and they are more than willing to do so if necessary, and I expect they will.” A few days later, New Orleans police officers shot six civilians, wounding four and killing two.

People revert to selfishness when group identity starts to break down. Drury describes how people acted when the cruise ship, Costa Concordia sank off the coast of Italy in 2012. “There was cooperation until one point, when people got to the lifeboats and there was pushing,” Drury says. “Selfishness isn’t a default because many times people are cooperative. It’s only in certain conditions that people might become selfish and individualistic. Perhaps there isn’t a sense of common fate, people are positioned as individuals against individuals. After a period of time, people run out of energy, run out of emotional energy, run out of resources, and that goodwill, that support, starts to decline. They just haven’t got the resources to help each other.”

Perceptions of group behavior can shape public policy. It’s important that policymakers, rather than seeing groups as problems to be overcome, which can lead to riots and mob behavior, take account of how people in groups help one another. After all, we have always been a social species who rely on each other for happiness and our survival. And groups can achieve things that individuals cannot. This understanding couldn’t be more important than now. We can build on people’s naturally arising feelings of unity by emphasizing that we are all in this together, and celebrating the everyday heroes who, sometimes at great cost, go out of their way to make the pandemic a little less awful.

Jim Davies is a professor of cognitive science at Carleton University and author of Imagination: The Science of Your Mind’s Greatest Power. He is co-host of the Minding the Brain podcast.

Lead image: Franzi / Shutterstock

For the second year in a row, the Government of Canada is enacting restrictions to help protect the southern resident killer whale population.

The donation included 50,000 protective coveralls and 100,000 masks