Friday Squid Blogging: Noise Pollution and Squid
It literally blows holes in their heads:
In the study, led by Michel André of the Technical University of Catalonia in Barcelona, biologists exposed 87 individual cephalopods of four species—Loligo vulgaris, Sepia officinalis, Octopus vulgaris and Illex coindeti—to short sweeps of relatively low intensity, low frequency sound between 50 and 400 Hertz (Hz). Then they examined the animals’ statocysts—fluid-filled, balloon-like structures that help these invertebrates maintain balance and position in the water. André and his colleagues found that, immediately following exposure to low frequency sound, the cephalopods showed hair cell damage within the statocysts. Over time, nerve fibers became swollen and, eventually, large holes appeared.