MyRomanticMatch – 4 New Matches!



eptible to invasion. This debate hinged on the spatial scale at which invasion studies were performed, and the issue of how diversity affects susceptibility remained unresolved as of 2011. Small-scale studies tended to show a negative relationship between diversity and invasion, while large-scale studies tended to show the reverse. The latter result may be a side-effect of invasives' ability to capitalize on increased resource availability and weaker species interactions that are more common when larger samples are considered. However, this spatial scale dependent pattern of the effects of invasion on diversity does not seem to hold true when the invader is a vertebrate. The brown tree snake (Boiga irregularis) Island ecosystems may be more prone to invasion because their species face few strong competitors and predators, or because their distance from colonizing species populations makes them more likely to have "open" niches. An example of this phenomenon is the decimation of native bird populations on Guam by the invasive brown tree snake. Conversely, invaded ecosystems may lack the natural competitors and predators that check invasives' growth in their native ecosystems. On small islands, native birds may have become flightless because of the absence of predators prior to introductions. These birds cannot readily escape the danger brought to them by introduced predators. The tendency of rails in particular to evolve flightless forms on islands has made them vulnerable and has led to the disproportionate number of extinc