Squid Lighting, Tongue Microbiome, Invasive Herbivores. March 27, 2020, Part 2

How Humboldt Squid Talk To Each Other In The Dark

Cephalopods are masters of changing their bodies in response to their environments—from camouflaging to sending warning signals to predators. The art of their visual deception lies deep within their skin. They can change their skin to different colors, textures, and patterns to communicate with other animals and each other. But how does this play out in the darkness of the deep ocean? That’s the question a team of scientists studied in the deep diving Humboldt squid that lives over 2,000 feet beneath the ocean’s surface. Their results were published this week in the journal Proceedings of the National Academy of Sciences. Biologist Benjamin Burford, who is an author on that study, explains how Humboldt squid use a combination of skin color patterns and bioluminescence to send each other signals and what this might teach us about communication in the deep ocean. See a video and more photos of Humboldt squid communicating with each other from Monterey Bay Aquarium Research Institute. 

Your mouth is home to billions of bacteria—some prefer to live on the inside of the cheeks, while others prefer the teeth, some the gums, or the surface of the tongue. Writing this week in the journal Cell Reports, researchers describe their efforts to map out the various communities of bacteria that inhabit the tongue. 

In the average mouth, around two dozen different types of bacteria form tiny “microbial skyscrapers” on your tongue’s surface, clustered around a central core made up of individual human skin cells. The researchers are mapping out the locations of the tiny bacterial colonies within those skyscrapers, to try to get a better understanding of the relationships and interdependencies between each colony. 

Jessica Mark Welch, one of the authors of the report and an associate scientist at the Marine Biological Laboratory in Woods Hole, Massachusetts, talks about what we know about the microbiome of the human mouth, and what researchers would still like to learn.

Colombia is home to an estimated 80 to 100 hippos where they’re an invasive species—hippos are native to Africa. But notorious drug lord Pablo Escobar brought four to the country as part of his private zoo. After his death in 1993, the hippos escaped to the wild where they thrived. 

Some locals consider them pests, the government has mulled over getting rid of them, and recent studies have shown that their large amounts of waste is changing the aquatic ecology of Colombia.

But new research has taken a different view, showing that even though hippos are invasive, they might be filling an ecological hole left by large herbivores killed off by humans thousands of years ago. Erick Lundgren, the study’s lead author and a Ph.D. student at the University of Technology in Sydney, Australia, talks about why we should stop thinking of the phrase “invasive species” as inherently bad, and what may be in store for the future of these hippos. 

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