... hydrodynamic forces; this adhesion is plastic and varies as a function of rock type and native population. Echinoid Hydrodynamic forces Surface roughness Tenacity Tube feet In the wave-dominated nearshore open coast, hydrodynamic forces dictate key ecological parameters such as species...

...D. Yerramilli; S. Johnsen SUMMARY Recent evidence that echinoids of the genus Echinometra have moderate visual acuity that appears to be mediated by their spines screening off-axis light suggests that the urchin Strongylocentrotus purpuratus , with its higher spine density, may have even more acute...

...Miles D. Lamare; Mike F. Barker; Michael P. Lesser; Craig Marshall SUMMARY To determine if an Antarctic species repairs DNA at rates equivalent to warmer water equivalents, we examined repair of UV-damaged DNA in echinoid embryos and larvae. DNA repair by photoreactivation was compared in three...

...Erin Blevins; Sönke Johnsen SUMMARY Although eyes are generally considered necessary for image resolution, a diffuse photoreceptive system with directional sensitivity may also have this ability. Two species of the echinoid genus Echinometra were tested for spatial vision by examining...

... that are known to reduce the transmission of mechanical forces to other structures. Given this similarity to other materials, three possible mechanisms for the action of the jelly coat may be identified. First, the apparent viscosity of the eggs of echinoids declines as the rate at which they are sheared during...

...Florence I. M. Thomas; Toby F. Bolton ABSTRACT Shear stresses experienced by eggs in the oviduct of the echinoid Arbacia punctulata during spawning were calculated using engineering equations that describe laminar flow through pipes. Shear stresses in the oviduct ranged from 0 to 58.7 Pa. Two...

... of Biologists 1993 viscosity larvae swimming echinoid cilia temperature Q10 Dendraster excentricus Most microscopic organisms live in aqueous media. For these organisms, motility depends both on internal, physiological processes and on the physical properties of the fluid environment...