| 释义 |
ecotone Ecology.|ˈiːkəʊtəʊn|
[f. eco- as in ecology + Gr. τόν-ος tension, tone.]
A transitional area between two ecological communities. Hence ˈecotonal a.
1904F. E. Clements in Bot. Surv. Nebraska VII. 153 Zonation in a habitat... The line that connects the points of accumulated or abrupt change in the symmetry is a stress line or ecotone... Ecotones are well marked between formations, particularly where the medium changes: they are less distinct within formations. It is obvious that an ecotone separates two different series of zones in the one case, and merely two distinct zones in the other. 1926Tansley & Chipp Study of Vegetation iv. 53 Transitional belts between well-marked communities are called ecotones or ‘tension belts’. 1950Jrnl. Ecology XXXVIII. 70 Apart from interdigitation of typical stands, ecotonal communities are to be found. 1952P. W. Richards Tropical Rain Forest xv. 338 Within the Closed forest there is manifestly a transition or ecotone from the..evergreen forests of the wettest areas to the..deciduous forests bordering the savannas. 1967Oceanogr. & Marine Biol. V. xi. 265 Mixing along the boundaries of two water masses may result in nature in an increase of the diversity of frontier or ecotone populations. |