Hacker creeps shake in their shells to repulse competitors that have designs in their homes – scientists have found.
Researchers at Dartmouth College in New Hampshire began to investigate the role of vibrations after they noticed that terrestrial crabs performed maneuvering movements when others ran back. So intense among the Pacific crabs that the animals have no doubt that they are moving to the ones they miss to measure if they can leave the current owner. Most only move up the site when another crab dies or evicts.
"They are constantly looking at someone who is weak enough to allow them to pull them out and move them to this shell," said Mark Leydre, who studies the social life of the crazy hermits. "When someone jumps on them, they dip into their shell and perform this traffic movement to keep them."
Sudden motion is not enough to cast an aggressor, but experiments Laidre and his colleague, Louise Roberts, suggest that, shaking in their shells, crabs signal that someone is at home and intends to stay in place. . Inside the case there was a device that mimicked the vibes produced by small or large crabs.
From the point of view of the umbrella for several meters, scientists watched as crabs-hermits approached the corps, which offered spacious living areas within walking distance of the sea. When the new hopee hopes to touch the shell, they clicked the button, which randomly chose whether the shell vibrated strongly, weakly or not at all.
"When they feel a strong vibration, they immediately leave. But when it's weak, they will be much more likely to try to flip the shell, which is the first step on the way to escalating the conflict, because it's the only way to get to the door, "said Leydra. "If there is no vibration, they are kept on it for a long time, but the wires prevent them from turning the shell."
Writing in biological sheets, scientists explain that vibration is a neglected aspect of communicating with animals. Next, they hope to investigate the unusual sound made by the hideous crayfish when evictions occur.