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Temperature Effect on the Photo‐Accumulation and Phobic Response of Volvox aureus *

1977; Wiley; Volume: 24; Issue: 2 Linguagem: Inglês

10.1111/j.1550-7408.1977.tb00978.x

2375-0804

Hironobu Sakaguchi, Katsuhisa Tawada,

Biocrusts and Microbial Ecology

SYNOPSIS. The effect of temperature on photoaccumulation and photophobic response of Volvox aureus were studied. The algae exhibited positive photoaccumulation at room temperature and negative at low temperature. When stimulated with light of intermediate intensiy (∼ 5 × 10 3 lux), the phobic response of the algae consisted of a decrease in the frequency or the cessation of flagellar movement in the anterior cells. At room temperature, an increase in light intensity elicited the phobic response, whereas at low temperature a decrease in light intensity was the effective stimulus. The phobic response lasted only a few seconds. The positive and negative photoaccumulations of the algae could be explained by the brief cessation of flagellar movement in the anterior cells, elicited by an increase of stimulus light at room temperature or a decrease of stimulus at low temperature.