What caused the Pleistocene Mass Extinction?

[tigerluver]

One possibility is the net production of the ecosystem where the tiger survived. Modern landscape such as rainforest (where the Javan tiger survived) harbor more energy. The problem with this is that South America is an area of one of the greatest net productions. 

I still feel that something about the select biomes of each area had to do with the extinctions. Humans can't be the only cause, as tons of other large fauna did survive. The bison of the USA still survived as smaller. Bears, probably smaller than today, still survived. Maybe there was an energy threshold required by the real giants that spelled there doom if the threshold was not met by the new ecosystem. 

Read this: http://www.geography.wisc.edu/faculty/wi...4final.pdf. Especially the last page, we can discuss from there. Reply