AP Biology class blog for discussing current research in Biology

Tag: Cadaver

A Baby Beetle’s Nursery is.. In a Dead Mouse?!

Two Parent Burying Beetles in a Dead Rodent! Gross!

Typically, death for animals is experienced at the end of one’s life, but this is reversed for a certain species of carrion beetle, Nicrophorus vespilloides or burying beetle, in which infant beetles are born and raised within dead mice carcasses. In this mice carcass, parent beetles frequently tend to the dead animal by soaking it with their own oral and anal secretions, providing the baby beetle with a much needed dark microbial film. This bacterial goo actually closely resembles the parent beetle’s gut microbiomes, allowing for the baby beetle to truly thrive as an offspring of this beetle.

But why give these baby beetles this goo within a dead carcass? What benefit would that ever give to an insect?

In every living thing, there is sphere of personal bacteria that provide much needed life benefits as well as qualities like your own stench. Plus, bacteria can even join together through various forms of cellular communication, making an almost impenetrable microfilm biome for bacteria to live in, as seen in plaque on human teeth. This same function is what helps support infant beetles with necessary nutrients and life benefits by keeping the cadaver fresh and capable of sustaining youngster life. Plus, it even causes dead bodies to smell actually not terrible, but instead more pleasant! Crazy! “What burying beetle parents can do with a small dead animal is remarkable,” says coauthor Shantanu Shukla of the Max Planck Institute for Chemical Ecology in Jena, Germany.  “It looks different. It smells different. It’s completely transformed by the beetles.”

If these insects aren’t exposed to these microbiomes as a child, there could be some serious detrimental effects. As shown by Shukla’s lab work, larvae grown in cadavers that were swept clean of biofilm by Shukla and her colleagues used their food less efficiently and gained less weight (“roughly third less weight per gram than those who had their parents goo”).

But, the parents are not the only ones who manipulate the carcass, which can be seen here. As parent beetles and tended to their goo in the body and guarding their children, the infant beetles also add their own secretions to the dead mouse and also eat away the bacteria as well as the entire mouse body. “What will remain is the tail of the mouse,” Shukla says, “and the skull and a few pieces of skin.”

Isn’t it simply crazy how much bacteria can contribute to the growth of a baby insect as well as its impact on even a dead animal? Comment below about what YOU think about this!

Grab your 3D glasses, it’s dissecting time!


Photo Credit- Tulane Public Relations

Welcome to the future fellow blog readers! If you are an aspiring medical doctor, listen up. If you go to the New York University School of Medicine, you may be asked to examine a virtual cadaver.

An article explains why students were asked to dissect a virtual cadaver, instead of an actual dead body. Actual cadaver’s, although they have been used for centuries to help teach aspiring doctors, are imperfect because of death and other factors. A cadaver must meet many qualifications to be used for research and teaching. The entire medical history must be known, and all vital organs and veins must be present for teaching purposes. But now, with this new technology from Nvidia, medical students can examine a virtual cadaver that is projected on to a screen.

With this new technology, the body can be dissected just as a real cadaver might, but with certain added bonuses. One student, Chana Rich, says that the new technology is particularly useful because she can continually replace organs and veins and it looks as though they had never been removed. Also, the interactive screen allows more students to examine the body and more easily. However, some people disagree. The general consensus among students and professors alike mirror that of a first year medical student Susanna Jeurling. “I don’t think this will ever replace cadavers. There’s something about being able to hold it and turn it in your hand.”

Despite the possible disadvantages, virtual cadavers are a valuable resource to be used in addition to the examination of actual cadavers. Professors at the NYU Medical School, and developers of the virtual body technology have great dreams for their invention. Expansion of the technology into everyday lives is in the plan for the new program, to be used as a useful tool for students in all types of education.

Do you feel that a virtual body can replace an actual cadaver? What are other possible advantages or disadvantages that you have thought of that aren’t outlined in this post?

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