He and others have voiced concerns about the fencing restricting animal migration and causing habitat fragmentation that harms endangered species such as jaguars, Sonoran pronghorns and ocelots in Arizona, New Mexico, Texas and elsewhere.
GRASP-mediated control of Golgi linking appears to occur during Golgi repositioning upon directed cell migration and during Golgi fragmentation upon apoptosis (reviewed by Vinke et al., 2011).
Especially in the absence of incoming migration and gene flow, fragmentation of an already small population may increase its extinction risk by exacerbating demographic and genetic stochasticity in the even smaller subpopulations [ 1].
The use of muscle explants in combination with defined matrix environments further demonstrated that distinct ECM components can differentially direct all of the cellular behaviors necessary for limb regeneration, including proliferation, migration, myofiber fragmentation and myoblast fusion.
For example, impacts of glacial periods upon temperate flora were prominent in the regional patterns of genetic differentiation, since they have been relevant to latitudinal or altitudinal migrations, population extinction, range expansion and fragmentation (Hewitt 2000).
Although a clear link between CSb fragmentation and migration and the successive speciation events has been demonstrated for other groups of animals [ 19- 21], the case of S. mediterranea is unique because a correlation between geological events and its distribution has not been linked to any speciation event, which implies a more ancient origin for S. mediterranea.
In newts, the transition of extracellular matrices at various stages of limb regeneration leads muscle cells to proliferation, migration, fragmentation, and fusion.
The characteristic "steinstrasse" appearance with calculi lining up along the ureter (Fig. 2) results from stone fragmentation and distal migration and represents an indication for URS.
In the previous example, fragmentation had a negative effect on the vector species, Ixodes ticks, through restricted migration and thus increased selective pressures, but also fragmentation had a positive effect on several of its hosts, through relaxed selection pressures linked to increased available habitats.
The above results are consistent with the general y-fragment enhancement found for peptides with C-terminal basic residues and provide further evidence of the effect of charge migration on fragmentation.
