photopositive


Also found in: Dictionary, Encyclopedia.

photopositive

(fō′tō-pŏz′ĭ-tĭv)
adj. Biology
Tending to move toward light.
References in periodicals archive ?
Expectedly, channel nets had appreciably higher family richness and diversity than did light traps, and this is consistent with our hypothesis that light traps are more selective (also see Choat et al., 1993) because not all larvae exhibit a photopositive response.
They attributed this differerence in size to a stronger photopositive response by larger pelagic larvae.
Larval behaviors can also change over time: the larvae of many invertebrate species are photopositive upon release and then become photoneutral or photonegative over time, a change that is often associated with an increase in exploring behavior (e.g., Ryland, 1960; Thorson, 1964; Wendt and Woollacott, 1999).
are typically photopositive upon release but become pho-tonegative over time (Ryland, 1960; Thorson, 1964; Wendt and Woollacott, 1999).
Elongation during locomotion (the normal photopositive response to light) was considered evidence of non-learning or non-recall.
Furthermore, during daylight hours, the strongly photopositive precompetent larvae swim upward (Miller and Hadfield, 1986).
In 76% of the cases examined, larvae that were initially photopositive became photonegative before the end of the larval period.
Light traps are taxon-selective because they target fishes that are photopositive and able to swim to and enter the trap (Thorrold, 1992; Choat et al.