The human body relies on sunlight to synchronize its internal clock. Light controls the release of hormones that tell our bodies whether it’s time to be alert or time to sleep – despite most of us needing an alarm clock to wake up. Most other animals, even those that are nocturnal, use sunlight to maintain their internal clocks as well. But animals living close to either of Earth’s poles need a different strategy during the long months of winter when there’s hardly any sunlight at all.
The Marine Science Institute's monthly column, Science and the SeaTM, is an informative and entertaining article that explains many interesting features of the marine environment and the creatures that live there. Science and the SeaTM articles appear monthly in one of Texas' most widely read fishing magazines, Texas Saltwater Fishing, the Port Aransas South Jetty newspaper, the Flour Bluff News, and the Island Moon newspaper. Our article archive is available also on our website.
When most people hear “shark,” they picture a large, sleek-bodied predator slicing through the open water, perhaps with the triangle of its dorsal fin poking through the surface as a warning. But there are more than 1,000 species of sharks of all shapes and sizes—including some small sharks that are adapted to living in very shallow water.
In storybook tales of old, sailors feared the Sargasso Sea as a mythically cursed region where the mightiest ships mysteriously vanished. Those stories, of course, are pure fantasy. This legendary sea doesn’t actually harbor a graveyard of doomed ships. But scientists have recently learned of an even greater treasure hidden below its famously calm blue waters—one that provides clues to an entirely different mystery.
Many microbes perform a key function in the cycle of life: breaking down dead and decaying organisms. But this important process often releases methane, a greenhouse gas that traps heat in the atmosphere 25 times more effectively than carbon dioxide. Now, however, a team of researchers from The University of Texas at Austin’s Marine Science Institute, working with scientists in China and The University of California at Berkeley, have discovered a new group of microbes that break down organic matter without producing methane.
Crown of thorns sea stars are dangerous predators on coral reefs. The sea stars are intimidating creatures that can grow to nearly a foot and a half across. Their multiple arms—up to 21 on a single individual—are covered in long, toxin-tipped spines, and they feed on coral. They can devastate entire reefs. One of the sea stars’ primary natural predators, the giant triton snail, is a threatened species, so it has been unable to prevent the crown of thorns from taking over massive coral reef regions in the Pacific Ocean.
You’ve probably heard that birds of a feather flock together. It turns out the same may be true for reef fish called emerald coral gobies. These fish live in small groups that include a single breeding pair and a host of subordinates who are ready to step in and take over as the male or female breeder if one of them dies. Scientists have learned from past research that these non-breeding subordinate gobies stick around in each group because being together offers them safety. The remaining question was why the larger breeders were willing to share space and resources with the hangers-on.
If you receive a slice of pie but learn you will get a whole pie to yourself if you can wait ten minutes, could you wait? Scientists previously thought only humans and other apes could delay gratification. Then they learned crows and parrots could wait for better rewards too. It turns out cuttlefish, a relative of octopuses and squid, have the same ability to forgo one treat to wait for a more desirable one.
Whether it’s a swagger or waddle, a strut or a prance, the way a person walks can reveal a lot about their personality before they say a word. It turns out, the same may be true for fish. We don’t exactly have words, yet, for what a swordfish’s swagger or a sturgeon’s strut might look like, but scientists may soon. A group of researchers recently documented the fin movements of three-spined sticklebacks and found them to be distinctive enough to identify each fish by how it swam.
Crunch! Connoisseurs of party food can often tell what kind of chips their friends are eating while watching the game by the crunch the chip makes. But all that crunching is usually annoying background noise. Underwater, though, it’s a different story. If scientists could tell which shellfish a predator is eating by the sound of its shell cracking open, they could track natural trends in predation on clams, conchs, oysters and other shellfish—important information for the seafood industry and conservation efforts.