Brush-footed butterflies’ sex life, new research


This 2014 video says about itself:

Brush-footed Butterflies (Nymphalidae)

A thirty-second video clip showing three different Brush-footed butterflies.

From the Florida Museum of Natural History in the USA:

In butterfly battle of sexes, males deploy ‘chastity belts’ but females fight back

September 3, 2020

Some male butterflies go to extreme lengths to ensure their paternity — sealing their mate’s genitalia with a waxy “chastity belt” to prevent future liaisons. But female butterflies can fight back by evolving larger or more complex organs that are tougher to plug. Males, in turn, counterattack by fastening on even more fantastic structures with winglike projections, slippery scales or pointy hooks.

It’s a battle that pits male and female reproductive interests against one another, with the losing sex evolving adaptations to thwart the winner’s strategies.

Could this sexual one-upmanship ultimately result in new species? It’s a longstanding hypothesis and one that would help explain how butterflies became so diverse. But it has proven difficult to test.

Ana Paula dos Santos de Carvalho, a doctoral student in the Kawahara Lab at the Florida Museum of Natural History, tackled the question in a study of mating plugs in brush-footed butterflies. She traced the trait’s evolution and analyzed the rate at which new species appeared across the Acraeini tribe, a group of about 300 species.

Unexpectedly, lineages with and without mating plugs evolved at the same rate, suggesting other factors such as habitat may be responsible for driving the insects’ diversity.

“I was expecting to see an association between plugs and new species appearing faster, but my work suggested there was no link at all,” Carvalho said. “Other studies had proposed a connection between sexual conflict and diversity, so these results came as a surprise.”

Found in about 1% of butterfly species, external mating plugs, also known as sphragis, can resemble a scab or a blob of petroleum jelly in some species while others take astonishingly architectural forms.

But they all serve the same purpose: enforcing female monogamy. Because a female butterfly fertilizes the majority of her eggs with sperm from her last partner, males have a vested interest in blocking rivals. Females, however, stand to benefit by mating with more than one male. Another partner may provide higher-quality sperm, and multiple mating events can increase the genetic diversity of offspring. Plus, females get a health boost from the nutrients included in males’ sperm packets.

To help guarantee their own successors, males in plug-producing species omit the courtship behavior that often precedes mating in other butterflies. Instead, “males pursue the females, grab them midair and drag them to the ground,” Carvalho said. After depositing their sperm, males excrete a pre-molded mating plug, which hardens on the female’s abdomen.

Plugs may indirectly constrain males as well. Making a mating plug is an expensive investment of time and resources, potentially limiting how many females a male can inseminate, she said.

Whether females can remove the plug requires further study, but in her fieldwork and museum specimen analysis, Carvalho noted the structures were often partially broken or missing in species with smaller, more delicate plugs. In species with large, complex plugs, she usually found the structures intact and rarely encountered a female without one — a sign that males may be “winning.”

But Carvalho’s study revealed some female victories as well. In the evolutionary family tree she constructed for Acraeini butterflies, she found evidence that mating plugs originated once across the tribe and were subsequently lost in some species, suggesting a successful female counteroffensive. Wide variations in the shape and size of female genitalia also hint at attempts to render mating plugs ineffective.

“Butterflies and moths continue to surprise us,” said study co-author Akito Kawahara, curator at the Florida Museum’s McGuire Center for Lepidoptera and Biodiversity. “This study suggests we still have a lot to learn about what drives insect diversity and the role sexual conflict plays in evolution.”

Racism and oppression in Trump’s USA


This 28 June 2020 video says about itselF:

The Racist Origins of the U.S. Police Force

From slave patrols, to enabling the lynchings of African Americans, to chokeholds: We explain how policing today is rooted in a history that comes out of slavery in the United States.

We speak to Dr. Keisha Blain, a historian specializing in African American history at the University of Pittsburgh, who outlines how U.S. policing has roots in a violent past.

And we take a look at why there are growing calls to defund, or even abolish the police.

Spokane Protester: I Was Abducted By Unidentified Officers, Put In Unmarked Van. A co-chair of the Spokane, Washington, chapter of the Democratic Socialists of America says unidentified law enforcement agents arrested him while he was walking to a Black Lives Matter protest last weekend, put him in an unmarked van and detained him for more than a day as federal agents attempted to interview him.

DSA member in Spokane, Washington detained by unidentified officers before police violence protest. By Kayla Costa, 7 September 2020. Jeremy Logan was snatched by five plainclothes police officers, and held in jail for over a day, where federal agents attempted to interrogate him, before being released.

In the face of increasing government, fascist attacks. Protests against police violence continue across the US. By Jacob Crosse, 7 September 2020. Despite daily assaults by police, federal agents and right-wing vigilantes, protests against police murder have continued across the US, in some cities topping 100 days.

GOP Candidate Who Touts QAnon Posts Photo Seemingly Threatening Democrats With Rifle. Republican House candidate and QAnon follower Marjorie Taylor Greene posted a photo of herself holding a rifle next to images of Democratic Reps. Alexandria Ocasio-Cortez (N.Y.), Ilhan Omar (Minn.) and Rashida Tlaib (Mich.).

Top Cop Ousted After Charging Civil Rights Leaders In Confederate Monument Case. The city manager of Portsmouth, Virginia, ousted the city’s police chief on Friday, weeks after the chief announced highly unusual felony charges against a sitting state senator, local civil rights leaders and city public defenders in connection with the destruction of a Confederate monument.

Lara Trump Campaigns With One Of America’s Most Vile Anti-Muslim Extremists [HuffPost]

Trump and dictatorship: here.