| 释义 |
profundal, a. and n. Ecology.|prəʊˈfʌndəl|
[ad. G. profund profound: see -al.]
A. adj. Applied to the region of the bed of a lake lying below the thermocline.
B. n. The profundal region of a lake bed.
[1928K. E. Carpenter Life in Inland Waters viii. 180 Modern workers usually prefer to recognise a ‘sub-littoral zone’.., ending at about 50 metres in lakes of the plain type.., and below this a ‘profound’ or ‘deep-water’ region.] 1931Ecol. Monogr. I. 233 In fresh-water lakes few animals have proved themselves capable of living in that unusual habitat, the anaerobic profundal zone of the lake bottom. Ibid. 245 In Third Sister Lake the three major benthic zones have the following approximate extent: littoral, 0–3 m.; sublittoral, 3–10 m.; profundal, 10–18 m. 1957G. E. Hutchinson Treat. Limnol. I. xv. 818 Enabling the animals of the profundal benthos to live not merely under conditions of low oxygen and high CO2 tension. 1961Ekol. Polska A. IX. 352 A total of 2300 samples was taken from the profundal of Lake Tajty. 1965B. E. Freeman tr. Vandel's Biospeleol. i. 9 The profundal regions of lakes..constitute an environment similar to the subterranean media. 1972Oikos Suppl. No. 14. 5 In the profundal of a eutrophic lake the environment is relatively homogeneous and the species diversity low compared with the littoral. |