Rather, the interpandemic evolution of influenza appears to consist of extended intervals of stasis, which are characterized by neutral sequence evolution, punctuated by shorter intervals of rapid fitness increase when evolutionary change is driven by positive selection.
With paleontologist Niles Eldredge, he began to argue in 1972 that the fossil record shows long periods of stability punctuated by rapid intervals of change.
These long periods of stasis are punctuated by shorter intervals of rapid evolution under positive selection during which new dominant lineages quickly displace previously coexisting ones.
Once released, individual flies explored the arena using a series of straight flight intervals punctuated by saccades (Fig. 1a).
Yellow, red, blue, gray, white boxes, aligned in regular intervals and punctuated by improvised riffs, form a seamless, perfectly balanced grid.
We found that the developmental transcriptome is characterized by intervals of gradual change punctuated by concerted shifts in gene expression.
The generally increased δO values in this interval are punctuated by a series of positive peaks, of which the first ranges between ~ 17.83 Ma and ~ 17.87 Ma and is defined as Mi-1b (Fig. 3; Billups et al., 2002).
The dark shales within the lagertätte intervals are, however, punctuated by thin partings of coarser sediment, which suggest a periodic freshening of the sediment-water interface and the potential to transport living meiofauna into deeper-water environments where they could profitably engage with the Arthroaspis carcasses.
Preston Cloud argued in 1948 and 1968 that the process was "explosive", and in the early 1970s Niles Eldredge and Stephen Jay Gould developed their theory of punctuated equilibrium, which views evolution as long intervals of near-stasis "punctuated" by short periods of rapid change.
This "explosive" view was supported by the hypothesis of punctuated equilibrium, which Eldredge and Gould developed in the early 1970s which views evolution as long intervals of near-stasis "punctuated" by short periods of rapid change.
