submitted by /u/resonantrosewraps [link] [comments] |
source https://www.reddit.com/r/Entomology/comments/npm6ps/soil_mite_that_caught_my_eye/
In a previous episode, we described the bizarre strategy called predator satiation used by periodical cicadas to overwhelm hordes of hungry predators intent on filling their bellies with these nutritious insects. The cicada’s long life span may also enable periodical cicadas to elude short-lived predators such as birds and small mammals that simply track cicadas through time. Who can wait 13 or 17 years for their next meal? But one patient nemesis of periodical cicadas has evolved a diabolical plan for making the most of the cicada bounty. In the soil beneath trees where cicada nymphs spend their youth sipping sap, resting spores of the fungal pathogen Massospora cicadina lay in wait for 13 or 17 years. During April and May as cicada nymphs escape from the earth, spores of Massospora adhere to the exoskeletons of nymphs. Compounds on the surface of the cicada send a signal to the spores that dinner is served and it is time to germinate. Like an invading army, the fungus penetrates the skin of the cicada and multiplies, turning the cicada into a fungus garden. In a short suspense, the infection turns the abdomen of the cicada into a buff-colored mass of fungus. At this stage of their life cycle, tens of thousands of newly molted adult cicadas populate the landscape to begin the courtship rituals. The infection sterilizes both male and female cicadas, but does nothing to quell the libido of the sex-crazed male cicada. Infected males continue to seek and attempt to mate with females despite their contagious infection. In a game of tit for tat, female cicadas infected with Massospora remain attractive to healthy males that soon become infected as they attempt to mate with females. At this point in time Massospora becomes a cicada STD and is transmitted from one cicada to another, thereby increasing its numbers each day. While the STD is strange enough, Massospora has one more trick to ensure maximum transmission of its spores. Recall from last week’s episode, that in the cicada mating game, after the male cicada puts on his best performance, the female signals her willingness to mate with an audible series of wing flicks. By a still not fully understood physiological mechanism, Massospora exerts mind control over an infected male cicada, causing him to mimic the female’s wing flick behavior. This results in horny male cicadas attempting to mate with Massospora infected males, further spreading the fungus through the cicadas’ populations.
Early in the Massospora infection cycle males and females with distended, distorted abdomens appear. Soon, fungal spore masses replace terminal abdominal segments. Sterile infected cicadas walk around and fly about, attempting to mate with uninfected cicadas and spewing spores into the environment while infecting their brood mates. Nearby, a healthy male cicada becomes entangled with an infected cicada in a bizarre pas de deux. In a strange twist of mind control, Massospora causes male cicadas to mimic the female’s wing-flick behavior, her coy signal of willingness to mate. Watch as a male uses his courtship call and attempts to woo a fungus-infected cicada that had just flicked its wings. His overactive libido will likely end in a lethal infection,n further spreading Massospora through cicada land. Videos by Michael Raupp and Paula Shrewsbury
A recent discovery of psychoactive compounds produced by Massospora suggests that these neuromodulators may play a role in altering the male’s behavior, contributing to the active transmission of the fungus by the cicada. Infected cicadas are flight capable and their peregrinations carry the fungus to new habitats as cicadas fly about. In low density populations of cicadas, mortality rates caused by Massospora range < 5% to ~ 25%. A second, more sinister wave of infection follows the first. In this stage, fungus-laden abdomens of infected cicadas and dying infected cicadas inoculate the soil with the resting spores of Massospora. While the loss of an abdomen spells instant death for a human, this is not the case for a cicada. Sensory and integrative neurological functions in the head and locomotory functions of flight and walking directed by the thorax remain intact despite the loss of the abdomen. As the season of the cicada progresses throughout cicada land, keep an eye out for male and female Massospora victims as they walk about missing their abdomen, macabre reminders of a very clever fungus.
The wonderful articles “A specialized fungal parasite (Massospora cicadina) hijacks the sexual signals of periodical cicadas (Hemiptera: Cicadidae: Magicicada) by John R. Cooley, David C. Marshall, and Kathy B. R. Hill, “The ecology, behavior, and evolution of periodical cicadas” by K. S. Williams and C. Simon, and “Behavioral betrayal: How select fungal parasites enlist living insects to do their bidding” by Brian Lovett, Angie Macias, Jason E. Stajich, John Cooley, Jørgen Eilenberg, Henrik H. de Fine Licht, and Matt T. Kasson where used to prepare this episode.
Hi, guys!! I found a bug that suddenly appeared from my popcorn, but it was so small that my camera couldn't even pick it up! This is the best photo I have but I can describe what it looked like. Very tiny, round, shiny, and looked black/dark brown and seemed to have six clear legs and antennae. I thought it was a baby spider, but I was sure I saw six legs. It was so cute and it just doesn't stop moving. It did stop in the creases of my fingers for just a few seconds before moving again. I have no idea what to do with it other than place it outside on a leaf. Do y'all know what this could be?? Thanks in advance! [link] [comments] |
I found it on my beetles and butterflies.
I can probably clean the beetles with alcohol, but what about the butterflies? I know alcohol damages their scales.
so my pet praying mantis died today and I want to honour her by preserving her because she was very special to me. I've pinned her body and plan to preserve her in alcohol as a wet specimen but I don't have a container for her yet. is she ok to be kept how she is for a week or so until I get a jar or should I freeze her or something? thank you!
Question : my plum tree is, as recently discovered, full of mealybug. Bug also, swarmed by bumblebees lately, could there be a connexion ? I remember when I was a kid that a tree in our garden was nearly dead, then the bumblebees came for like a week or two, and one morning, they were gone, and the tree was flourishing. I wonder if the same is happening here, they feed on the honeydew the cochineal produce, thus kind of help the tree, and will leave when there will be no more, perhaps ? Could I be right ?
Got my daughter a butterfly kit from InsectLore with 10 caterpillars that should hopefully turn into painted lady butterflies. She’s OBSESSED. Unfortunately, I didn’t consider the timing, as we are leaving on a road trip from MA to ME in 8 days. Half of the caterpillars became chrysalides today and the others look like they’re getting ready (hanging from top). So here’s the thing - seems like we’ll likely be leaving before they turn into butterflies (or just as they begin to emerge). I’m going to have a very disappointed 3yo on my hands. 🤦🏼♀️ You think we can (carefully) take them on our ~5hr drive or will the inevitable bumps/turns of a road trip be too rough for them? Trying to decide if we take them with us or give to a friend to keep and send video updates.