| 单词 | photic zone |
| 释义 | > as lemmasphotic zone 2. Designating the part of the sea or other body of water which is penetrated by sufficient sunlight for the growth of plants. Chiefly in photic zone. ΘΚΠ the world > the earth > water > sea or ocean > region of sea or ocean > [adjective] > upper parts oceanic1851 neritic1891 photic1903 euphotic1909 1903 W. R. Fisher tr. A. F. W. Schimper Plant-geogr. 782 Three chief stages of brightness may be distinguished: 1. The photic or bright region [Ger. photische oder helle Region], in which the intensity of light is sufficient for the normal development of macrophytes. 1920 Jrnl. Ecol. 8 170 Since the photic zone for rooted plants is at most 10 m. and is usually less than 7 m., water temperature is not likely to limit the downward extension of vegetation. 1972 A. Laurie Living Oceans iv. 88 For small, slow-moving animals the twilight zone is also a safer habitat than the photic zone, which is the home of many active predators, especially fast-moving fish. 1992 Nature Canada Fall 18/1 Staying in the photic (sunlit) zone is an obvious priority for the phytoplankton. < as lemmas |
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