| electrical studies on the compound eye of ligia occidentalis dana (crustacea: isopoda). | the erg of the compound eye in freshly collected ligia occidentalis, in response to high intensity light flashes of (1/8) second or longer duration, begins with a negative on-effect quickly followed by an early positive deflection, rapidly returns to the baseline during illumination, and ends with a positive off-effect. as the stimulus intensity is decreased the early positivity progressively decreases and the rapid return to the baseline is replaced by a slowing decline of the negative on-effec ... | 1954 | 13174786 |
| sea-land transitions in isopods: pattern of symbiont distribution in two species of intertidal isopods ligia pallasii and ligia occidentalis in the eastern pacific. | studies of microbial associations of intertidal isopods in the primitive genus ligia (oniscidea, isopoda) can help our understanding of the formation of symbioses during sea-land transitions, as terrestrial oniscidean isopods have previously been found to house symbionts in their hepatopancreas. ligia pallasii and ligia occidentalis co-occur in the high intertidal zone along the eastern pacific with a large zone of range overlap and both species showing patchy distributions. in 16s rrna clone li ... | 2010 | 20730112 |
| discontinuous ammonia excretion and glutamine storage in littoral oniscidea (crustacea: isopoda): testing tidal and circadian models. | a key evolutionary development facilitating land colonization in terrestrial isopods (isopoda: oniscidea) is the intermittent liberation of waste nitrogen as volatile ammonia. intermittent ammonia release exploits glutamine (gln) as an intermediary nitrogen store. here, we explore the relationship between temporal patterns of ammonia release and gln accumulation in three littoral oniscideans from southern california. results are interpreted in terms of water availability, habitat, activity patte ... | 2013 | 22836297 |
| respiratory physiology of the oniscidea: aerobic capacity and the significance of pleopodal lungs. | the radiation of the terrestrial isopods (sub-order oniscidea) has been accompanied by evolution of pleopodal lungs in the sections tylida and crinocheta. to understand the significance of such lungs for aerobic respiration, comparative studies were conducted using 6 species. ligia occidentalis, lacking lungs, behaved as a metabolic conformer in reduced po(2), and showed decreased v(.-)o(2) in low humidity and following dehydration. in species possessing lungs, metabolism was insensitive to dehy ... | 2006 | 16875858 |