Graduate Thesis Or Dissertation
 

The role of stridulation in the behavior of the shore crab Hemigrapsus oregonensis

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  • The claw shuddering display of the shore crab Hemigrapsus oregonensis was explored with acoustic and behavioral observations. Male H. oreqonensis stridulate during claw shuddering display. The stridulatory apparatus is present only on the males. The acoustic signal was of brief duration, showed a general pattern of sound bursts, but varied among individual crabs. The larger crabs produced more intense signals. Because H. oreqonensis live in a turbid water of a mud-rock habitat or in burrows of the estuary, acoustic communication is well suited to their environment. Behavioral observations of H. oregonensis, collected from Yaquina Bay, Oregon, were made in habitat replicas of the mud-rock environment. Stridulation by male crabs was elicited equally by male and female crabs but the amount of stridulation increased when all the crabs were males. The strldulat,ing crab was typically maintaining a territory and did not retreat after signaling. The significance of stridulation in the total repertoire has not been resolved but territoriality as exemplified by burrow defense and communication facilitating ritualization have been indicated, and its importance in sexual behavior has not been demonstrated.
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