The Insane Biology of: Ant Colonies
Summary
TLDRThis script delves into the remarkable world of ants, highlighting their dominance and complex social behaviors. Ants, with a population exceeding human biomass, have a profound ecological impact. The script explores their caste system, communication through pheromones, and the concept of the superorganism, challenging traditional evolutionary theories. It also touches on the human fascination with these tiny creatures and the scientific debates they inspire, offering insights into both nature and human society.
Takeaways
- š Ants are among the most dominant creatures on Earth, with a biomass comparable to that of all humans combined.
- š Ants have colonized nearly every landmass and have significantly influenced the evolution of other species.
- š° The ant colony's social structure, with a reproductive royal caste and a non-reproductive worker caste, is key to their success.
- š The queen ant is the sole reproducer of the colony, and her well-being is the primary focus of the worker ants.
- š Worker ants are responsible for various tasks, including caring for larvae, constructing nests, and foraging for food.
- š Ants exhibit complex behaviors and communication systems, utilizing over 20 different pheromones to convey messages.
- š¬ The discovery of ant communication by EO Wilson in 1962 revolutionized our understanding of their social organization.
- š³ Weaver ants, known for their sophisticated pheromone communication, build intricate nests by weaving leaves together.
- š¤ Ants display a high level of cooperation and self-sacrifice, often prioritizing the colony's needs over their own survival.
- š§¬ The concept of the 'superorganism' in ant colonies challenges traditional evolutionary theories, suggesting group selection may play a role.
- š Studying ants provides insights into the nature of evolution, social behavior, and even parallels to human society.
Q & A
What are some of the most dominant creatures on earth when considering size, strength, and intelligence?
-When considering size, the blue whale is the largest animal that has ever lived. In terms of strength and ferocity, big cats in lush forests might come to mind. For intelligence and widespread presence, human beings are often considered the most dominant creatures on the planet.
What is the total population of ants and how does their combined weight compare to humans?
-The total population of ants is around ten thousand trillion. When combined, their total weight is about the same as the weight of all human beings.
How have ants influenced the evolution of other species on earth?
-Ants have colonized almost every landmass on earth and their presence is so significant that they have directed the evolution of countless other plant and animal species.
What are the two castes in an ant society and what is the role of the queen?
-Ant societies are divided into a non-reproductive worker caste and a reproductive royal caste. The queen is the only reproducing female of the entire colony, and the colony exists to serve her.
How does the birth of an ant colony begin?
-The birth of an ant colony begins with the birth of a queen, which hatches from a special kind of egg laid by the mother queen when the colony reaches a certain size.
What is the role of the worker ants in a colony and how do they differ?
-Worker ants are female ants whose lives are devoted to the queen's welfare and reproductive activity. They can vary in size and type, with roles ranging from caring for larvae, excavating tunnels, building structures, to searching for food or going to war with neighboring colonies.
How do ants communicate and what was discovered about their communication system in 1962?
-Ants communicate using a complex system of chemical and physical signals. In 1962, entomologist EO Wilson discovered that ants use pheromones for communication, starting with the identification of Dufourās gland as a source of a chemical trail.
What is unique about the communication system of African weaver ants?
-African weaver ants have one of the most sophisticated pheromone communication systems ever studied in animals, using a combination of pheromones on the ground and physical gestures to convey messages.
How do weaver ants construct their nests and what role do the larvae play in this process?
-Weaver ants construct their nests by weaving branches and leaves together. They use their larvae, which produce silk, as a binding agent to seal the leaves together, similar to using a hot glue gun.
What is the concept of the superorganism in relation to ant colonies?
-The concept of the superorganism suggests that the ant colony functions as a single organism, with the queen as the reproductive organ and the workers as the supporting brain, heart, and gut.
How has the study of ant societies influenced evolutionary theory?
-The study of ant societies has led to the development of the theory of multi-level evolution or group selection, suggesting that natural selection can act at the level of the group rather than just the individual.
What is the significance of the queen's death in an ant colony and how do the workers react?
-The death of the queen is significant as it often leads to the decline of the colony. Instead of raising another queen, the workers typically do not produce a royal successor, leading to the eventual extinction of the colony.
Outlines
š Ants: Earth's Dominant Creatures
This paragraph introduces the concept of dominance in nature, leading to a discussion about ants as one of the most successful creatures on Earth. Despite their small size, ants have a significant biomass and impact on ecosystems, with a population that rivals the total weight of all humans. The paragraph delves into the ants' colonization of nearly every landmass, their influence on the evolution of other species, and their complex social behaviors within colonies. It highlights the importance of the queen ant and the absolute loyalty of the worker ants to the colony, which contributes to their ecological success.
š The Social Structure and Communication of Ants
This section explores the social structure of ant colonies, divided into reproductive and non-reproductive castes, with the queen ant at the center of the colony's existence. It discusses the life cycle of a queen, from her birth to the establishment of a new colony. The paragraph also explains the worker ants' roles and how their development is influenced by nutrition. Furthermore, it uncovers the complex communication system of ants, which relies on pheromones and physical gestures, with a focus on the sophisticated pheromone language of African weaver ants. The ability of ants to construct their habitats, such as the weaver ants' nests, is also highlighted, showcasing their remarkable cooperative skills.
š¬ The Superorganism Concept and Evolutionary Implications
This paragraph examines the concept of the superorganism in relation to ant colonies, where the collective functions as a single entity with the queen acting as the reproductive organ and the workers as the supporting organs. It discusses the altruistic behavior of worker ants, their lack of self-interest, and the profound loyalty to the queen, even to the point of colony collapse upon her death. The text challenges traditional evolutionary theories by introducing the idea of multi-level evolution, suggesting that natural selection can act at the group level. The study of ant societies raises questions about the nature of individuality and the role of group dynamics in evolution.
šļø Modulus Podcast and CuriosityStream Partnership
The final paragraph shifts focus to the Modulus podcast, which delves into the stories behind the science, featuring interviews with scientists and individuals affected by scientific topics. The speaker promotes the second episode, which discusses the experiences of saturation divers. The paragraph also introduces Nebula, a streaming platform for ad-free educational content, and its partnership with CuriosityStream, offering a discount on annual subscriptions. The promotion includes access to a wide range of documentaries, including one on ant biology by David Attenborough, and encourages support for educational content creators.
Mindmap
Keywords
š”Dominant creatures
š”Ants
š”Colonies
š”Castes
š”Queen ant
š”Worker ants
š”Pheromones
š”Superorganism
š”Altruism
š”Evolutionary theory
š”Communication
Highlights
Ants are arguably the most successful creatures to have ever lived due to their significant population and impact on ecosystems.
Ants have colonized almost every landmass and directed the evolution of many other species.
Ant colonies exhibit complex social behaviors, with absolute loyalty to the colony.
Ants emerged around 100 million years ago and became dominant insects 60 million years ago.
Ant societies are divided into a non-reproductive worker caste and a reproductive royal caste, with the queen being the sole reproducer.
The birth of a new colony begins with a special egg laid by the mother queen, leading to winged reproductive ants.
Worker ants are female ants devoted to the queen's welfare, with roles varying from caring for larvae to foraging for food.
Ant workers decide the fate of the young, with larvae developing into different castes based on nutrition.
Leafcutter ants demonstrate extreme polymorphism among workers, with roles ranging from defense to fungus farming.
Ant communication is based on a complex system of chemical and physical signals.
EO Wilson's research in 1962 revealed the role of pheromones in ant communication.
African weaver ants have a sophisticated pheromone communication system, using both ground signals and physical gestures.
Ants use a combination of signals that resemble syntax in human language, facilitating cooperation.
Weaver ants construct their own housing by weaving branches and leaves together, demonstrating their organizational labor capacity.
Ants' self-sacrifice and loyalty to the queen challenge the concept of individuality in the animal kingdom.
The concept of the superorganism in ants has led to debates on multi-level evolution and group selection.
Studying ants provides insights into the nature of evolution and parallels to human society.
The podcast 'Modulus' explores the stories behind the science, featuring interviews with scientists and affected individuals.
Nebula, a streaming platform, offers ad-free access to educational content and original series, supporting content creators.
Transcripts
When you think of the most dominantĀ creatures on earth - what comes to mind? Ā
If considering sheer size, perhaps youĀ immediately thought of the ocean - and theĀ Ā
largest animal thatās ever lived - the blue whale.Ā Or perhaps thinking of strength and ferocity,Ā Ā
you imagined lush forests full of fearsome bigĀ cats. Or maybe, quite sensibly, you thought ofĀ Ā
us - human beings- the most intelligent, and oneĀ of the most widespread creatures on the planet. Ā
But if you were to walk down the sidewalk, or leanĀ against a tree, the first animal that you wouldĀ Ā
likely encounter is something small - ants. TheirĀ total population is around ten thousand trillion,Ā Ā
and when combined their total weight would beĀ about the same as the weight of all human beings.Ā Ā
in biomass and in impact on ecosystems,Ā these small animals are arguably the mostĀ Ā
successful creatures to have ever lived. Ants have colonized almost every landmass onĀ Ā
earth. Their presence is so significant that theyĀ have directed the evolution of countless otherĀ Ā
plant and animal species. Aggressive, warlike,Ā but also cooperative, altruistic - ants livingĀ Ā
in colonies exhibit some of the most complexĀ behaviors of all insects. And the colony is theĀ Ā
only thing that matters in the lives of ants.Ā Their loyalty to it is absolute. And in theirĀ Ā
service to it, they exhibit some of the mostĀ complex social behavior in the animal kingdom,Ā Ā
giving rise to their nearly completeĀ ecological conquest of the earth. Ā
How do ant societies work, and what is it aboutĀ the colony that has made ants so successful?Ā Ā
Is it as simple as āstrength in numbers?āĀ Or is it something more profound? Ā
Even though insects were among the firstĀ animals to colonize land, cooperative insectĀ Ā
societies are a relatively recent development. The first insects emerged around 400 millionĀ Ā
years ago - but ants didnāt emerge untilĀ much later, around 100 million years ago.Ā Ā
They lived amongst the dinosaurs, and for a longĀ time did not rule the landscape. This was theĀ Ā
era of the giant dragonflies, cockroaches, andĀ termites. It wasnāt until 60 million years agoĀ Ā
that they became the dominant insects. And sinceĀ then, they have truly flourished. Today there areĀ Ā
around 16,000 different species of ant, and theyĀ are found on every continent except Antarctica. Ā
The competitive edge that allowed antsĀ to become a world-dominant group is theirĀ Ā
highly developed colonial existenceĀ and specialized social structure. Ā
Ant societies are broken up into two castes: aĀ non-reproductive worker caste, and a reproductiveĀ Ā
royal caste. The queen is the only reproducingĀ female of the entire colony, and the colonyĀ Ā
exists to serve her, and her alone. The birthĀ of a colony begins with the birth of a queen. Ā
The life of a queen begins when its mother queenĀ lays a special kind of egg, different from theĀ Ā
millions of regular worker eggs the queen antĀ will lay in her lifetime. These special eggsĀ Ā
are laid when the colony passes a certain size -Ā and when they hatch, they produce ants that areĀ Ā
larger than regular workers and have wings. TheseĀ are the reproductive males and young queens. Ā
During what is called a nuptial flightĀ these winged ants take to the air andĀ Ā
mate with each other, after which the malesĀ die and the females drop to the ground,Ā Ā
scrape off their wings and begin to search forĀ a place to dig their nest. Few get far in thisĀ Ā
journey. Predators snag most of these youngĀ queens before they can establish themselves.Ā Ā
Only around 1 in 500 new queens has a chanceĀ at success. But those that do succeed becomeĀ Ā
the single egg-laying queen of their new colony. Over the course of her life, a queen ant can layĀ Ā
up to 300 million eggs, depending on the speciesĀ of ant. And the vast majority of these eggsĀ Ā
hatch into dedicated worker ants - female antsĀ whose lives are devoted to the queenās welfareĀ Ā
and reproductive activity. At any given time,Ā there are millions of worker ants maintainingĀ Ā
the colony. There can be many different types,Ā and many different sizes of workers even withinĀ Ā
a single colony. Some care for larvae, othersĀ excavate tunnels, others build amazing structures,Ā Ā
while others leave the nest and search forĀ food, or go to war with neighboring colonies. Ā
And surprisingly, it is the ant workers themselvesĀ who ultimately decide the fate of the young,Ā Ā
choosing which worker caste theyĀ will develop into. Larvae developĀ Ā
into different types of workers basedĀ largely on the nutrition they receive.Ā Ā
Those fed more insects than seeds areĀ more likely to become larger individuals.
For leaf cutter ants, the polymorphismĀ that exists among the workers is extreme.Ā Ā
The largest workers, called soldiers, defendĀ the colony, while the medium sized workersĀ Ā
collect leaves, excavate tunnels, or collectĀ garbage, and the smallest workers raise theĀ Ā
young and cultivate and farm fungus - theĀ only food source for the whole colony. Ā
The workers toil away in a flawless synchronyĀ - in a flow that looks chaotic to our eyes,Ā Ā
but is in fact based on aĀ complex system of communication,Ā Ā
a chemical and physical language invisibleĀ to us, but binds these societies together. Ā
For years, scientists knew that ants mustĀ have some way to talk to each other in orderĀ Ā
to organize their intricate societies.Ā But ants have poor vision and hearing,Ā Ā
so scientists knew that ant communication mustĀ work in a fundamentally different way to ours. Ā
It was a mystery for years, but in 1962 leadingĀ entomologist EO Wilson began to crack the codeĀ Ā
of ant communication. He started with theĀ question of how ants tell other members ofĀ Ā
the colony the location of a new food source. HeĀ noticed that ants often tap their abdomen to theĀ Ā
ground when travelling, so wondered if theyĀ were leaving some sort of chemical trail. Ā
He began painstakingly dissecting fire antĀ abdomens, crushing each of the organs withĀ Ā
an applicator stick. He would then spreadĀ the ant juice on a piece of paper in frontĀ Ā
of other fire ants, to see if they would react.Ā As he worked through each of the known organs,Ā Ā
the ants showed no interest. But then he stumbledĀ upon an organ that had never been studiedĀ Ā
before - something called Dufourās gland. When heĀ crushed this gland and spread it across the paper,Ā Ā
the ants went wild. They followed theĀ trail immediately and completely. Ā
Over time, scientists have discovered over 20Ā different pheromones that ants use to communicate.Ā Ā
And by combining different signals, antsĀ have created a complex pheromonal language. Ā
African weaver ants, in particular, have the mostĀ sophisticated pheromone communication system everĀ Ā
studied in animals. Some of their thoughts areĀ expressed by spreading pheromones on the ground,Ā Ā
like previously mentioned,Ā combined with physical gestures. Ā
When a worker wishes to say āfollow me I haveĀ found some foodā she deposits a trail from theĀ Ā
rectal gland, while running from the food backĀ to the nest. When she encounters other workers,Ā Ā
she waves her head and touches the other antĀ with her two antennae. Or when a worker wishesĀ Ā
to raise the alarm about an enemy, she laysĀ short looping trails around the intruder withĀ Ā
secretions from the sternal gland. Other signals are sent through theĀ Ā
air. When an African weaver ant workerĀ encounters an enemy in her own territory,Ā Ā
she releases a mixture of four chemicals thatĀ not only convey a message but elicit a responseĀ Ā
from all other workers in her vicinity. The first tells the other ants to ābe alertā.Ā Ā
The next one tells them to search for theĀ trouble. The next one tells them to comeĀ Ā
closer and bite anything in their path, and theĀ final compound tells them to go nuts and attack. Ā
Scientists believe that the combination ofĀ these signals very closely resembles syntaxĀ Ā
that we see in human language. A main reason antsĀ are so successful in the world then, is the sameĀ Ā
reason that humans are. Like us, communicationĀ gives ants the amazing capacity to cooperate. Ā
Of all ants, weaver ants are among the mostĀ impressive. They dominate the forests inĀ Ā
Africa and Australia, in large part due to theirĀ complex and efficient chemical communication.Ā Ā
But perhaps more remarkable than theirĀ ability to communicate so effectively,Ā Ā
is what they can achieve with it. WeaverĀ ants are a species of ant that do not liveĀ Ā
in or on the ground, but in the trees. AndĀ to keep their huge populations safe there,Ā Ā
they construct their own housing. They weaveĀ branches and leaves together to create anĀ Ā
architectural feat, full of a network of differentĀ rooms complete with roofs, walls, and floors. Ā
To begin the process, a single ant searches forĀ a nice, bendy looking leaf. It will pull on theĀ Ā
edges, testing to see if the leaf will curl.Ā If the ant has some measure of success, otherĀ Ā
ants will be attracted to the endeavor, and beginĀ pulling the edge as well. As the leaf bends more,Ā Ā
more workers arrive. They line up in precise rows,Ā gripping the edge, pulling it towards anotherĀ Ā
leaf. If the gap is too large for a single row ofĀ ants to seal, they perform an impressive acrobaticĀ Ā
tactic: they chain their bodies together to formĀ a bridge. Workers climb down the bodies of others,Ā Ā
until the chain can reach the other leaf edge, upĀ to 10 workers long. Once the leaf edges are withinĀ Ā
reach, the workers move into position to seal theĀ leaves together. But what looks like glue on theĀ Ā
finished structure is something more surprising. Once the bent leaves are ready to be sealed,Ā Ā
the workers will collect larvae who areĀ in their final stages of development,Ā Ā
and use their threads of silk to bind the leavesĀ together. Holding the larvae in their mandibles,Ā Ā
the workers move the larvae back and forth acrossĀ the leaf edges - using their babies like a hotĀ Ā
glue gun. The larvae seem okay with this, as theyĀ respond to this motion by exuding thousands ofĀ Ā
threads of silk. This silk becomes a sheet betweenĀ the edges, and works as a powerful adhesive. Ā
Structures like this speak to ants capacityĀ to organize their labor effectively, millionsĀ Ā
of individuals combining their abilities intoĀ something much greater. Itās easy to assume, then,Ā Ā
that their effectiveness comes down to a strengthĀ in numbers, along with the communication toĀ Ā
orchestrate the work. But this canāt account forĀ all of their behavior, and all of their success.Ā Ā
There is something more unifying in the world ofĀ the ants. And the individual antās cooperationĀ Ā
with one another is so profound, that it makesĀ scientists rethink the idea of individuality. Ā
The power of a group is evident - with more antsĀ working together, they can find food more quickly,Ā Ā
build more impressive structures, andĀ defend against enemies more effectively.Ā Ā
And working together is common in nature -Ā birds in flocks, or bison in herds live longerĀ Ā
when they live in groups. But in cooperativeĀ animal groups like these, individuals stillĀ Ā
look out for their personal interests.Ā For them it's not just about the group. Ā
But this is not the case for ants. Worker antsĀ die young, and usually donāt create offspring.Ā Ā
Their existence is sacrificial. They have no selfĀ interest. Certain ants have been found to suffer aĀ Ā
death rate of 6% per hour when outside the nest,Ā due to fighting with neighboring colonies. OnĀ Ā
average each forager survives for only a week. ButĀ during that time, she manages to collect 20 timesĀ Ā
her own body weight in food for the colony - allĀ to support the group, and ultimately, the queen. Ā
This unwavering loyalty to the queen,Ā and the self sacrifice to her cause,Ā Ā
becomes more evident when a queen dies. LogicĀ would assume that when the queen dies the workersĀ Ā
would raise another queen to replace her. But thisĀ is not at all what the workers do. In most cases,Ā Ā
the colony fails to produce a royal successor,Ā and it declines until the last worker dies. TheyĀ Ā
simply do nothing until there is no one left. This level of altruism and self sacrifice is soĀ Ā
rare in the animal kingdom, that it hasĀ made scientists rethink what it meansĀ Ā
to be an individual. If ant individuals in aĀ colony are not competing against each other,Ā Ā
if they are bound tightly by communication and aĀ caste-division of labor, if they cannot surviveĀ Ā
out of the colony for very long - does theĀ concept of the individual break down? Ā
The idea of the superorganism is one that hasĀ been debated for decades. With ants, it's theĀ Ā
idea that the colony is the organism, where theĀ queen is the reproductive organ, the workers theĀ Ā
supporting brain, heart, and gut. The exchange ofĀ food among the workers is like the circulation ofĀ Ā
blood. [6] The most advanced ant societies, likeĀ weaver ants, driver ants, or leafcutter ants,Ā Ā
fall into this category, where their workersĀ do not compete amongst themselves at all,Ā Ā
and do not reproduce outside of royalty. This capacity of the colony to act like a singleĀ Ā
superorganism has made scientists reconsiderĀ evolutionary theory as a whole. In the 1960sĀ Ā
and 70s, the conventional way of thinkingĀ about evolution was centered around genes,Ā Ā
and genes alone. Largely popularized by DawkināsĀ book The Selfish gene, it follows that the moreĀ Ā
two individuals are genetically related, the moreĀ sense it makes for them to behave selflessly withĀ Ā
each other - that all altruistic group behaviorĀ comes down to each individualās competitive desireĀ Ā
to improve chances of their kinās survival. But some ant biologists, like EO Wilson,Ā Ā
believed that this couldnāt be the whole story.Ā Instincts from social species like ants go farĀ Ā
beyond the urge to protect their immediate kin.Ā The group must also have a role in evolution,Ā Ā
whether or not the group members are relatedĀ to each other. And this idea gave rise to theĀ Ā
theory of multi-level evolution, or groupĀ selection, where natural selection actsĀ Ā
at the level of the group, instead of at theĀ more conventional level of the individual. Ā
The way ant societies function, in their dailyĀ lives and within evolution, has entranced us asĀ Ā
humans for decades. They have created heatedĀ debates among the worldās top scientists,Ā Ā
and been the focus of every kidās backyardĀ curiosity. Their world operates in ways ourĀ Ā
brains can barely conceive - with chemicalĀ signals painted on the ground, instincts thatĀ Ā
drive them to fatal endeavors - and yet, theirĀ sociality, cooperation, and complexity in manyĀ Ā
ways mirrors our own. Studying ants will continueĀ to reveal answers about the nature of evolution,Ā Ā
and in turn, will reveal answers about ourĀ own society, and our own individuality. Ā
Studying the animal kingdom gives insight intoĀ our world, and brings researchers on all sortsĀ Ā
of journeys - both intellectual and physical. SomeĀ of the research about ants happens in the field,Ā Ā
in the steamy tropics or theĀ frigid parts of northern Finland.Ā Ā
And some of it is done in the lab, withĀ complex apparatuses engineered to studyĀ Ā
antās chemical trails or their inclination toĀ go to war with each other. Hearing about whatĀ Ā
it takes to carry out research like this is oftenĀ just as interesting as the science itself. I loveĀ Ā
hearing the human stories behind the science -Ā and this is why we decided to start a podcast. Ā
Modulus - hosted by me, and Brian fromĀ Real Engineering, is a podcast about theĀ Ā
people behind the science we explore here onĀ YouTube. We talk to the scientists who are onĀ Ā
the cutting edge of research, and the peopleĀ who are affected by the topics we discuss. Ā
The second episode of Modulus is out now. Itās anĀ episode where I talk to two pioneers of the ocean:Ā Ā
some of the worldās first saturation divers. TheyĀ discuss what itās like to live at the bottom ofĀ Ā
the ocean, and how it affects both your body andĀ your mind. Their personal accounts of the effectsĀ Ā
of the immense pressure on their bodies very muchĀ makes you realize that the profession of deep seaĀ Ā
diving is not for the faint of heart. This episode is available now on Nebula,Ā Ā
the streaming platform made by me and severalĀ other educational YouTube content creators.Ā Ā
It's the place to watch and listen to our videosĀ and podcasts ad free, along with original contentĀ Ā
that is not available anywhere else like theĀ Real Engineeringsā the Logistics of D-day,Ā Ā
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in sometimes silly tasks and trying notĀ to make fools out of themselves. We canĀ Ā
take more risks and have more fun on Nebula,Ā where we donāt have to worry about the YouTubeĀ Ā
algorithm. There is so much original contentĀ there, with more being added all the time. Ā
And to make it even better, Nebula has partneredĀ with CuriosityStream, the streaming platformĀ Ā
with thousands of high budget, high qualityĀ documentaries. There are loads of the bestĀ Ā
nature films, like David Attenborough's AntĀ Mountain - which explores one of the largestĀ Ā
animal societies in the world - a supercolonyĀ of ants, with more than a billion members,Ā Ā
nestled within the Swiss Alps. It dives into aĀ whole new area of ant biology that I never knew,Ā Ā
and since itās a David AttenboroughĀ film you know it's going to be good. Ā
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