To find some information about your ecoregion visit:
http://www.tpwd.state.tx.us/huntwild/wild/wildscapes/guidance/plants/ecoregions/
And
http://www.tpwd.state.tx.us/publications/pwdpubs/media/pwd_bk_w7000_0030.pdf

For information about catastrophic events visit:
http://www.science-class.net/Lessons/Ecology/TheDayAfterTomorrow.htm and scroll to the bottom and find the links for your catastrophic event.