And you thought the sexual battles between people could get weird and fierce? Try ants.
In a new study, biologists at the University of Vermont have discovered some queen ants that make sexual bondage into a life and death fight.
The red queen in the middle is mating with the upside-down male on the right. Their copulatory organs are locked in place, so the male can completely let go of the queen with his legs and still be firmly attached. The ant on the left is a competitor male trying to get in on the action.
Credit: Michael Herrmann and Sara Helms Cahan
In a discovery new to science, their research shows that sexual conflict between two species can drive an evolutionary bedroom-battle royal, leading to competing adaptations in which female ants of one species manage to manhandle sperm away from the unwitting males of a different species during intercourse. The study was published in the October 29 online edition of the Proceedings of the Royal Society B.
In the desert along the Arizona/New Mexico border, the scientists observed mating between two species of Pogonomyrmex harvester ants that are known to hybridize. The queens of one species will happily mate with males of another species. But these queens have a trick in their antly boudoir: they only use this sperm from the other species to produce sterile worker ants that they need to build their colonies.
This, you might imagine, isn't what the male ants are hoping will happen with their precious seed. Sure, these males will produce lots of daughters via this queen, but these daughters will be sterile and "so they'll have no grandchildren," says Sara Helms Cahan, a biologist at UVM who co-led the study with her graduate student and lead author Michael Herrmann.
Sterile offspring are directly contrary to the males' long-term evolutionary interest in passing on their genes. So why do these males agree to hook up with these queens in the first place? In the field studies, Herrmann observed that the males—in the once-a-year mad scrum of competitive mating that these harvester ants exhibit following summer monsoon rains—didn't seem able to distinguish queens of their own species from queens of the other species. That is, they couldn't tell them apart until they began to copulate.
Then—perhaps a bit like other dawnings of awareness among males of a well-known species in the middle of the sex act—the male ants figure out they've made a big mistake. Realizing that they have mated with the wrong species, they get clever, and reduce the rate at which they transfer their sperm into these crosstown queens. "They can mate again," Helms Cahan explains, "so this would preserve their sperm for investment into better mating."
But the queens will not be jilted so easily. They have evolved another trick to counteract the males' strategy: hold on and don't let go. "They lock slow males in copula significantly longer," says Helms Cahan, "until they eventually deliver the same amount of sperm that they normally would have." Score one for the queens.
"Essentially, they are sperm parasites," she says.
The new ant study is a "rather unusual R-rated example," Helms Cahan says, of a larger biological phenomenon called the Red Queen hypothesis. Like the Red Queen in Alice in Wonderland—who says, "you see, it takes all the running you can do, to keep in the same place"—the theory proposes that many plants and animals must constantly adapt and evolve not just to gain reproductive advantage but also to simply avoid extinction when competing against opposing, and also-evolving, organisms in the endless shifting of life.
"In this harvester ant system there really needs to be some sort of stalemate," Herrmann explains, "because if the males actually were able to tell what type of female they were mating with, they would cut off the sperm to the queens that need it." Then the system would collapse because these queens have evolved to only be able to produce workers with sperm of the other species, but not their own.
There is "a conflict of interests," the scientists write in the journal article "as queens must mate with both lineages to produce both daughter queens and the workforce to care for them, but males gain fitness returns only by mating with queens of their own lineage."
The new study is also a powerful illustration of the fact that in the wider biological world, "females are not just passive players in reproduction," Helms Cahan says, "they have their own distinct evolutionary interests, and are just as capable of imposing those interests on their partners when conditions warrant."
Joshua Brown | EurekAlert!
Hunting pathogens at full force
22.03.2017 | Helmholtz-Zentrum für Infektionsforschung
A 155 carat diamond with 92 mm diameter
22.03.2017 | Universität Augsburg
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
22.03.2017 | Materials Sciences
22.03.2017 | Physics and Astronomy
22.03.2017 | Materials Sciences