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killer_2Dbee

One of the ongoing horror stories from when I was in middle school was the invasion of the Africanized killer bees.  In retrospect, it all sounds like a xenophobic horror movie from the 1950s, but people were truly alarmed back in the 80s.  There were sensationalist news stories featuring the death of children and animated maps of the killer bees spreading unstoppably across America.  The narrative was that mad scientists in South America had hybridized super-aggressive African bees with European bees in an attempt to create superbees (better able to survive in the tropics and produce more honey).  These “Africanized” bees then escaped and started heading north, killing innocent humans and devastating local hives as they invaded.

An animated map of the spread of killer bees (uploaded to Wikipedia by uploaded by Huw Powell)

An animated map of the spread of killer bees (uploaded to Wikipedia by uploaded by Huw Powell)

The amazing thing about this story is that it is all true.  In the 1950s a biologist named Warwick E. Kerr imported 26 queen bees (of subspecies Apis mellifera scutellata) from the Great Lakes area of Africa to Brazil.  A replacement beekeeper allowed the queens to escape in 1957 and they began to interbreed with local bees (of the European subspecies Apis mellifera ligustica and Apis mellifera iberiensis).  The resulting hybridized bees were indeed better able to survive the tropics and quicker to reproduce, but they were also more defensive of their hives, more inclined to sting, and more likely to swarm (i.e. get together in a big angry cloud and fly off somewhere else when they felt unhappy).   The killer bees (for want of a better term) could more readily live like wild bees in ground cavities and hollow trees.  The hybrid bees out-competed local honeybees and spread across the continent.  Sometimes aggressive queens would enter domestic hives and kill the old queen and take over!

Don't make her angry!

Don’t make her angry!

Although Ancient Egypt may have been an early adapter of apiculture, Sub Saharan African societies did not practice beekeeping but hewed to the ancient tradition of bee-robbing.   The African subspecies of honeybees came from a more challenging environment than the European subspecies.  Forced to contend with deep droughts and fiendish predators (like the infamously stubborn honey badger), the bees are more defensive and more mobile than their northern counterparts.  Apis mellifera scutellata is famous for not backing down from raiders but instead stinging them with dogged determination until the intruder flees far from their hive.  This has led to unfortunate instances of children, infirm adults, and people with bee allergies falling down and being stung to death (which sounds like a really bad end) by the American hybrid.  The sting of an Africanized bee is no more puissant than that of a European honeybee (and it also results in the death of the bee) but dozens—or hundreds—of stings can add up to kill a healthy adult.

(largely) satiric

(largely) satiric

The entire Africanized bee event was really a case of anti-domestication.  Imagine if everyone’s dogs were suddenly replaced by wolves or if placid white-and-black cows were supplanted by ravening aurochs.   If you follow that bizarre thought to its logical conclusion, you will anticipate what actually happened.  Although initially dismayed, Brazilian beekeepers began to discover more placid strains of Africanized bees and started to redomesticate them.  The hybrid bees do indeed produce more honey, survive droughts better, and it is believed they have a greater resistance to the dreaded colony collapse sweeping through honey bee population.  Perhaps in the fullness of time we will learn to love the infamous killer bees.

Africanized "friend" bees?

Africanized “friend” bee?

Man O’ War (Photograph by Enrique Talledo)

The Portuguese man o’ war (Physalia physalis) is not a jellyfish, in fact it is not a discreet animal at all, but instead a siphonophore—a colonial medusoid made up of specialized animal polyps working together as an organism.   These siphonophores have stinging tentacles which typically measure 10 metres (30 ft) in length but can be up to 50 metres (165 ft) long.  Being stung by a man o’ war does not typically cause death, but sailors and mariners who have survived the experience assert that it taught them a new definition of agony.

Glaucus atlanticus

But the fearsome man o’ war is not the subject of this post.  Instead we are concentrating on the animal which feeds on the man ‘o war (as well as other siphonophores which drift in the great blue expanses of the open ocean).  One is inclined to imagine that men o’ war are eaten only by armored giants with impervious skins and great shearing beaks (and indeed the world’s largest turtles, the loggerheads, are the main predators of siphonophores), however another much less likely predator is out there in the open ocean gnawing away at the mighty stinging colonies.   Glaucus atlanticus, the blue sea slug, is a tiny shell-free mollusk which lives in the open ocean.  The little nudibranch only grows up to 3 cm in length but it hunts and eats a variety of large hydrozoans, pelagic mollusks, and siphonophores (including the man o’ war).

Glaucus atlanticus eating velella colony animal

Although not quite as gaudy as its lovely cousins from tropical coral reefs, Glaucus atlanticus is a pretty animal of pale grey, silver, and deep blue with delicate blue appendages radiating out from its six appendages.  The little mollusks live in temperate and tropical oceans worldwide. They float at the top of the water thanks to a swallowed air bubble stored in a special sack in their gastric cavity. Because of this flotation aid, the slug is able to cling upside down to the surface tension of the waves.  Since it is entirely immune to the venomous nematocysts of the man o’ war, the sea slug can store some of the man o’ wars venom for its own use.   The tendrils at the edge of Glaucus atlanticus’ body can produce an extremely potent sting (so it is best to leave the tiny creatures alone, if you happen to somehow come across them).

Glaucus atlanticus inshore

Each and every Glaucus atlanticus is a hermaphrodite with a complete set of sex organs for both genders.  Incapable of mating with themselves they ventrally (and thoroughly) embrace another blue sea slug during breeding, and both parties then produce strings of eggs.  The hatchling nudibranchs have a shell during their larval stages, but this vestige quickly disappears as they mature into hunters of the open ocean.

A female velvet ant (mutillidae wasp)

Velvet ants (Mutillidae) are not actually ants at all—the insects are classified as wasps even though female velvet ants do not have wings and appear to be tiny furry colorful ants. The Mutillidae family of wasps—which is made up of more than 3000 species– illustrates how closely wasps, bees, and ants are actually related.   Male velvet ants look nothing like the females but are much larger winged creatures resembling other wasps.  So great is the sexual dimorphism between the genders that it took entomologists a tremendously long time to pair the females with the males, and in many species the connection has still not been made by science.  The genders do however both share a ridged structure called a stridulitrum, which can be rubbed or struck to produce chirps and squeaks for communication.

Male velvet ant (mutillidae wasp)

Female velvet ants are notable not just for their colorful fur but for their tremendously powerful sting which is so painful that they are nicknamed “cow killers.”  Male velvet ants look like wasps but do not sting.  The exoskeletons of velvet ants are tremendously hard to such an extent that some entomologists have reportedly found it difficult to drive pins through specimens.  The dense hard coating helps the females invade the underground burrows of larger bees and wasps which the velvet ants sting and lay eggs on.  When the velvet ant larvae hatch they feed on the paralyzed victims before metamorphosing into adult form and venturing into the world.

Blue velvet ant (female)

Velvet ants are found in warmer parts of the world particularly deserts.  The majority of species are red and black but a variety of other colors are known including blue, gold, orange, and white.  Unlike the social ants and termites, velvet ants are generally solitary, coming together only to reproduce with their strangely alien mates.

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