CHAPTER 8 notes - Central case saving the Siberian tiger o...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
CHAPTER 8 Central case: saving the Siberian tiger o Although tigers once roamed across Asia, today they are exceedingly rare and approaching extinction o Siberian tigers are the largest cat in the world The Russian Far East mountains house the last remaining Siberian tigers Historically, native people rarely killed tigers o Recently, the wild population approached extinction Hunting, poaching, and habitat destruction from road building, logging, and agriculture o International conservation groups are working to save the species from extinction Research, education, zoos, captive breeding programs Biodiversity encompasses several levels o Humans are diminishing earth’s diversity of life o Biodiversity= sum total of all organisms in an area Split into 3 specific levels: Species diversity Genetic diversity Ecosystem diversity Species diversity o Species diversity= the number or variety of species in the world or in a particular region Species richness= the number of species Evenness or relative abundance= extent to which numbers of individuals of different species are equal or skewed Speciation generates new species and adds to species richness Extinction reduces species richness o Taxonomists= scientists who classify species Common ancestry, ability to interbreed Genera= related species are grouped together Families= groups of genera o Every species has a 2 part scientific name: genus and species Subspecies: the level below species o Subspecies= populations of species that occur in different areas and differ slightly from each other
Background image of page 1

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

View Full Document Right Arrow Icon
Divergence stops short of separating the species Subspecies are denoted with a third part of the scientific name Genetic diversity o Encompasses the differences in DNA among individuals within species and populations o The raw material for adaptation to local conditions o Populations with higher genetic diversity can survive They can cope with environmental change o Populations with low genetic diversity are vulnerable To environmental damage Disease o Imbreeding depression= genetically similar parents mate and produce defective offspring Ecosystem diversity o Ecosystem diversity= the number and variety of ecosystems o It also encompasses differing communities and habitats Sizes, shapes, and interconnectedness of patches within habitats, communities, or ecosystems Some groups contain more species than others o Species are not evenly distributed among taxonomic groups Insects predominate over all other life forms 40% of all insects are beetles o Groups accumulate species by : Adaptive radiation Allopatric speciation Low rates of extinction Measuring biodiversity is not easy o Species richness is a good gauge for overall biodiversity o Out of out “best guess” estimates off 5-30 million species on earth, only 1.7-2million have been identified and described o Very difficult to identify species
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 10

CHAPTER 8 notes - Central case saving the Siberian tiger o...

This preview shows document pages 1 - 3. Sign up to view the full document.

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