The phrase 'population contraction' is a correct and usable phrase in written English.
It is used to describe a decrease in population size, usually due to environmental factors, disease, war, or other causes. For example, "The deer population in the area has suffered from a population contraction due to loss of habitat and hunting."
Many loci showed a discontinuous allele distribution, with missing alleles across the allele size range, suggestive of a population contraction.
Avoiding catastrophe is a benefit that trumps all the challenges, so we should embrace, celebrate and pursue population contraction in all parts of the world.
Their dramatic increase in number over the next few days, their migration out of the white pulp and their population contraction to memory cells was beautifully documented in this study.
This expansion phase is followed by a period of population contraction resulting in only a small fraction of the expanded population surviving and entering the memory cell pool [1] [3].
Substantial departures of the tests are detected in the opposite direction for more heterochroneous and equilibrated datasets, with balanced trees mimicking in particular population contraction, balancing selection, and population differentiation.
In contrast two subsets of similar sizes separated by greater time spacing (on the order of the depth of a typical tree) can lead to spurious balanced tree generally interpreted as signals of population contraction, moderate bottleneck or simple population isolation between those subsets.
Population contraction-expansion, which has occurred regularly in the Quaternary, provides an opportunity for rapid stochastic loss or fixation of alleles (haplotypes).
In accordance with this, all species with an Ne/N ratio higher than 0.75 are on the IUCN Red List, indicating recent and severe population contractions.
These methods should exclude the possibility of these signals being produced randomly or by demographic events such as expansion or population contractions.
As phylogenetic inferences improve, genetic signs of population contractions and expansions related with broad intense climatic changes are expected to be detected.
Second, we used the M-ratio method (Garza and Williamson 2001) to detect historical population contractions (Garza and Williamson 2001; Williamson-Natesan 2005).
