| 释义 |
planktonic, a. and n. Biol.|plæŋkˈtɒnɪk|
[a. G. planktonisch (E. Hæckel 1891, in Jenaische Zeitschr. f. Naturwiss. XXV. 240): see plankton and -ic.]
A. adj. Of, pertaining to, or characteristic of plankton.
1893G. W. Field tr. Hæckel's Planktonic Stud. in Rep. U.S. Comm. Fisheries 1889–91 571, I adopt the term Plankton in place of ‘Auftrieb’, and derive from it the adjective planktonic. 1899Proc. Zool. Soc. 1029 Most, if not all, Globigerinæ, are essentially planktonic organisms. 1905Marr in Q. Jrnl. Geol. Soc. LXI. Proc. 74 Planktonic. 1930Times Educ. Suppl. 22 Mar. (Home & Classroom Suppl.) p. iv/1 Quantities of nektonic and planktonic life are being caught daily. 1963Times 19 Feb. 10/4 Sediments of past ages..contain a boundary clearly defined by changes in their content of fossilized planktonic remains. 1974Nature 8 Feb. 393/2 Herbivorous zooplankton can graze on planktonic algae, bacteria and detrital particles.
B. n. A microfossil of a foraminifer included in the plankton.
1959Bull. Amer. Paleontol. XXXIX. 84 These assemblages of agglutinated forms..occur several times and are separated by assemblages of calcareous forms, often with abundant planktonics, suggestive of a depositional depth between 200 and 600 metres. 1964Micropaleontology X. 3/2 The coiling characteristics of planktonics can be most useful in correlating strata from different basins and with entirely different benthic biofacies. 1976Ibid. XXII. 420/1 The total number of planktonics, benthics, and fragments was counted. |