| form and motion of donax variabilis in flow. | the coquina clam, donax variabilis, rides flow from waves, migrating shoreward during rising tides and seaward during falling tides. this method of locomotion, swash-riding, is controlled not only behaviorally but also morphologically. the shape of this clam causes it to orient passively; a clam rotates in flow, usually in backwash, until its anterior end is upstream. rotation is about a vertical axis through a pivotal point where the shell touches the sand. the density, weight distribution, and ... | 1995 | 27768478 |
| behavioral control of swash-riding in the clam donax variabilis. | clams of the species donax variabilis migrate shoreward during rising tides and seaward during falling tides. these clams spend most of the time in the sand, emerging several times per tidal cycle to ride waves. migration is not merely a passive result of waves eroding clams out of the sand; rather clams actively jump out of the sand and ride specific waves. such active migration is experimentally demonstrated during a falling tide by comparing the motion of dead and live clams; live clams emerg ... | 1995 | 27768487 |
| discrimination among wave-generated sounds by a swash-riding clam. | clams, donax variabilis, responded to sound stimuli presented to them in a laboratory aquarium by jumping out of the sand, lying on the sand for several seconds, and digging in again. on a beach, clams jump out of the sand and ride waves, migrating shoreward with the rising tide and seaward with the falling tide. parallels between clam behavior on a beach and that elicited in the laboratory suggest that clams cue on wave sounds to jump out of the sand. three aspects of the response to sound were ... | 1995 | 27768488 |
| helpful habitant or pernicious passenger: interactions between an infaunal bivalve, an epifaunal hydroid and three potential predators. | the importance of positive interspecific interactions within physically stressful habitats has received increased attention from community ecologists. the exposed sandy beach is an example of a physically rigorous environment where biological interactions have long been considered insignificant. we examined the interaction between the infaunal clam, donax variabilis, and the hydroid, lovenella gracilis, on exposed sandy beaches in north carolina. epibiotic occupation of donax by hydroids has bee ... | 2003 | 12647150 |
| increased expression of stress proteins in the surf clam donax variabilis following hydrogen sulfide exposure. | endogenous free radical production and resulting oxidative damage may result from exposure to hypoxia, hyperoxia, or hydrogen sulfide. previous investigations of sulfide-induced oxidative damage have produced conflicting results, perhaps because these studies utilized species presumably adapted to sulfide. we examined the effects of sulfide, hypoxia and hyperoxia on the surf clam donax variabilis to test whether these stressors induce a cellular response to oxidative stress. these clams inhabit ... | 2006 | 16890466 |