Topic+19.+Hotspots

Topic+19.+Hotspots - Topic 19: Hotspots I. Hotspots. Areas...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Topic 19: Hotspots I. Hotspots. Areas of earth that are most threatened and where we have the most species to lose. Terrestrial only is considered. Twenty-five hotspots identified. slide of map Concept originated by Myers, now huge book by Mittermeiers (husband and wife) and Myers. II. Two criteria (that give us our 25 hotspots) : A. Valuable species . Must have >0.5 % of world’s total vascular plant species (ferns and seed plants) endemic to the area of the hotspot (Def of endemic: found nowhere else). That comes out to 1500 endemic species. Now, criterion broadened to higher vertebrates (mammals, birds, reptiles, amphibians), and these are also used to rank the hotspots in order of value. B. Threatened by human activities . Must have 25% or less of land area in intact vegetation (intact = natural, not disturbed by man). III. Would like to convince you of the importance of hotspots. What, exactly, is at stake for the earth’s future? Can argue about useful species for food, drugs, ecosystem function, genetic
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/06/2011 for the course EVE 101 taught by Professor Strong,d during the Fall '08 term at UC Davis.

Page1 / 3

Topic+19.+Hotspots - Topic 19: Hotspots I. Hotspots. Areas...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online