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Experimental demonstration of exclusively passive feeding in the sea-turtle barnacle Chelonibia testudinaria Linnaeus, Cirripedia: Coronulidae. Reproductive biology of the deep-sea shrimp Heterocarpus chani Li, Decapoda: Caridea: Pandalidae from southern India. In the case of barnacles and whales, only the barnacles benefit from attaching to the whales, but at no biological cost to the whale. This type of symbiotic relationship is known as commensalism. In this case, attaching to the whales gives the barnacles a stable place to live, a free ride, and access to plenty of food.
When the whales swim into plankton-rich waters to feed, so do the barnacles. They are consistently carried from feeding to feeding. Protection from predators is another benefit. Barnacles attached to stationary objects often fall prey to fish, sea worms, starfish and snails. However, the whale-riding barnacles enjoy a certain degree of protection from the mobility of their enormous bodyguards. For the most part, whale barnacles are harmless, even in astoundingly large numbers.
For example, one humpback whale can host 1, pounds of barnacles without any problems. However, a few exceptions to the rules of commensalism can occur. On some whales, too many barnacles can cause drag. May 17, at am. Brad says:. May 22, at pm. GoodMorningGloucester says:.
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