Coccolithophore diversity and abundance within Levante Bay may be due to (1) slow surface currents that carry upper photic
zone coccolithophores into the bay, with detrimental conditions resulting in assemblage depauperization toward the seeps; or (2) almost complete dissolution of the community at the seep and subsequent dilution further from this area, coupled with the mixing of new surface water from offshore.
While in strongly stratified lakes the P transport from sediments to the photic
layers is mainly controlled by the terminally directed changes in the water density then in large and shallow lakes wind and wave energy are responsible for the water mixing and transport of P-rich waters within the lake.
In other regions, they have been observed to be factors that contribute to the balance between the source of nutrients towards the photic
layer and primary production (Chavez et al.
Neurophysiological studies on photic
responses in Ophiura ophiura.
The directional homing behaviour of the subsocial shield bug, Parastrachia japonensis (Heteroptera: Cydidae), under different photic
Virtually all corals and other cnidarians on coral reefs in the photic
zone are infected by mutualistic dinoflagellate algae of the genus Symbiodinium.
stimulation of the foot evokes inhibitory inputs to neurons in the pedal ganglia via the inferior pedal nerves.
During the first phase of this experiment, the animals were placed in the greenhouse and exposed to the natural photic
environment for 48 days.
Our recent observations of the photoresponse of statocyst hair cells indicate that rostral and caudal hair cells respond to the onset of the photic
stimulus, while lateral, medial, and central hair cells do not (Sakakibara et al.
In the retinas of amphibia (7), fish (8), and mammals (6), zinc is present in photoreceptors, which signal second-order cells by regulating glutamate release in response to photic
The high rates of oxygenic photosynthesis that occur in the narrow photic
zone of the mat create steep and variable gradients (Revsbech et al.
tonsa to this photic
stimulus ranged from a minimum of about 30 ms to a maximum of more than 150 ms, compared to about 4 ms for hydrodynamically stimulated escape jumps.