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In ecology, stratification refers to the vertical layering of a habitat; the arrangement of vegetation in layers. [1][2] It classifies the layers (sing. stratum, pl. strata) of vegetation largely according to the different heights to which their plants grow. The individual layers are inhabited by different animal [3] and plant communities ...
Graphic breakdown of stratified random sampling. In statistics, stratified randomization is a method of sampling which first stratifies the whole study population into subgroups with same attributes or characteristics, known as strata, then followed by simple random sampling from the stratified groups, where each element within the same subgroup are selected unbiasedly during any stage of the ...
Stratification (seeds) In horticulture, stratification is a process of treating seeds to simulate natural conditions that the seeds must experience before germination can occur. Many seed species have an embryonic dormancy phase and generally will not sprout until this dormancy is broken. [1]
Plants that colonize forest edges tend to be shade-intolerant. [ 6 ] These plants also tend to be tolerant of dry conditions , such as shrubs and vines . Animals that colonize tend to be those that require two or more habitats, such as white-tailed and mule deer , elk , cottontail rabbits , blue jays, and robins .
Shifting cultivation is a form of agriculture or a cultivation system in which, at any particular point in time, a minority of 'fields' are in cultivation and a majority are in various stages of natural re-growth. Over time, fields are cultivated for a relatively short time, and allowed to recover, or are fallowed, for a relatively long time.
The Lincoln Index is merely an estimate. For example, the species in a given area could tend to be either very common or very rare, or tend to be either very hard or very easy to see. [3] Then it would be likely that both observers would find a large share of the common species, and that both observers would miss a large share of the rare ones.
The Pyrenean ibex, also known as the bouquetin, is the only animal to have survived de-extinction past birth.. De-extinction (also known as resurrection biology, or species revivalism) is the process of generating an organism that either resembles or is an extinct species. [1]
t. e. Sequential hermaphroditism (called dichogamy in botany) is one of the two types of hermaphroditism, the other type being simultaneous hermaphroditism. It occurs when the organism's sex changes at some point in its life. [1] A sequential hermaphrodite produces eggs (female gametes) and sperm (male gametes) at different stages in life. [2]