Life Zone

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life zone

[′līf ‚zōn]
A portion of the earth's land area having a generally uniform climate and soil, and a biota showing a high degree of uniformity in species composition and adaptation.

Life Zone


one of the large subdivisions of the biosphere; a spatially expressed complex of abiotic, mainly climatic, factors and groups of plants and animals that have adapted to them. The concept of the life zone was introduced by the American scientist C. H. Merriam in 1890.

On land, a distinction is made between horizontal life zones (tundra, taiga, steppe, and so on) and vertical life zones. The latter are found in mountain areas (alpine meadows, mountain forests, and so on). Life zones in the oceans are longitudinal (two polar zones with constant low temperature and floating ice, two temperate zones with sharp seasonal temperature fluctuations, and one equatorial zone with constant high temperature) and vertical (littoral, sublittoral, deep-sea, abyssal, and so on). The fact that life zones are insufficiently distinguished from topographical zones has led to a failure to use the term “life zone.”

References in periodicals archive ?
We recorded 98 species (36.7 %) of the 267 species documented and five species not registered in the three life zones by Fogden (2014).
Moreover, classification of tabonuco forest using Holdridge's (1967) ecological life zone system designated the Mameyes watershed as Subtropical rain forest and the Quebrada Sonadora as Subtropical wet forest (Ewel and Whitmore, 1973).
Inc., 2001), was created using the Lambert comformal Conic projection, in which the following information was included: province, county and district, latitude, longitude, altitude, species of ectoparasites and life zone; in order to classify the geography and ecology of each locality sampled using the Holdridge's life zones system (Holdridge, 1987).
From the base to the top of 10,378-foot Sandia Peak, time and terrain seem to move in harmony as passengers lift from the desert floor, rise above canyons and lush forests, and travel to the mountaintop: 2.7 miles of sky-view travel and discovery of New Mexico's varied landscape and life zones. A platform-lift raises wheelchair users from ground level to the tram's boarding area.
Didymopanax pittieri is a shade-intolerant canopy tree from lower montane rain forest life zones of Costa Rica and western Panama (Holridge et al.
With the risk of generalizing, you could divide Europe into these shelf life zones: Scandinavia, divided between 6 and 18 months; Denmark seeking a compromise solution of 12 months; and the rest of Europe again divided between 7 and 18 months' shelf life.
Because Costa Rica is so compact, incredible biodiversity--represented by more than a dozen life zones and reflected in the rich plant and animal life--can be viewed in a relatively short period of time.
By matching climatic patterns with known plant limitations, the researchers produced maps showing the locations of tundra, forests, savannas, and other types of "life zones," They compared a life-zone map for current conditions with a map representing a climate with double the amount of [CO.sub.2].
During an extra-low tide, you can easily see all the major intertidal life zones in a compact area.
In addition to taxonomic treatments of ferns and allies, gymnosperms, and angiosperms, the book includes information on the study parameters, geology and climate descriptions, plant communities and vegetation patterns, migration routes and influences, illustrations of vegetation associations and life zones, a key to the families of flora in the region, glossary, works cited, etc.
Then you walk past dioramas showing the eight major plant and animal life zones found here, from the beach to the Great Basin.