4.1.1 Biodiversity. Biodiversity. The amount of biological diversity per unit area. It includes: genetic, habitat and species diversity. Genetic Diversity. Is the total number of genetic characteristics of a specific species. Habitat Diversity.
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The amount of biological diversity per unit area.
It includes: genetic, habitat and species diversity
Is the total number of genetic characteristics of a specific species.
Variety of forests, deserts, grasslands, lakes, oceans, coral reefs, wetlands, and other biological communities,
(niches per unit area).
Is the number of species or organisms per unit areafound in different habitats of the planet.
Tropic of Cancer
Tropic of Capricorn
Critical and endangered
Stable or intact
Projected Status of Biodiversity
What are the relationships among ecosystem stability, diversity, succession and habitat ?
Why Should We Care About Biodiversity? diversity, succession and habitat ?
usefulness to us.
because they exist,
Regardless of whether
they are useful to us or
Foxglove diversity, succession and habitat ?
Digitalis for heart failure
Evolutionhttp://www.pbs.org/wgbh/evolution/educators/teachstuds/svideos.html are the changes in the gene pool of a population over time.
Natural selection process by which individuals that are better suited to their environment survive and reproduce most successfully.
Adaptation is an inherited characteristic that increases an organism’s chance of survival.
KONA FINCH http://www.pbs.org/wgbh/evolution/educators/teachstuds/svideos.htmlextinct
fruit and seed eaters
insect and nectar eaters
Based on his observations, Darwin proposed that EVOLUTION occurs by NATURAL SELECTION.
Population of organisms occurs by
Mutations & Sexual reproduction produces variations among offspring.
Overproduction of offspring
Limited resources leads to a struggle for survival between offspring.
Survivors reproduce more successfully.
Population changes over time.
Extinctions of many marsupials and early placental mammals
About 5 million years ago, during the Pliocene
Fig. 27.19d, p. 471
Nonvertebrate chordates occurs by
Eurasia occurs by
MONOTREMES, MARSUPIALS EVOLVE AND MIGRATE THROUGH PANGEA
About 150 million years ago, during the Jurassic
Fig. 27.19a, p. 471
MONOTREMES occurs by
MARSUPIALS occurs by
Isolation of the early monotremes, marsupials on this land mass
Between 100 and 85 million years ago, during the Cretaceous
Fig. 27.19b, p. 471
PLACENTAL MAMMALS occurs by
Beaver occurs by
Continued isolation of early monotremes and marsupials
Extinctions of mammals
About 20 million years ago, during the Miocene
Fig. 27.19c, p. 471
SPECTACLED BEAR occurs by
15-20 million years ago
40 million years ago
Fig. 20.10, p. 319
A group of potentially or actually interbreeding populations, with a common gene pool, which are reproductively isolated from other groups
The species concept is a human construct used to make sense of the natural world. While extraordinarily helpful in understanding life, it fails to capture the full complex reality of continually evolving populations of organisms.
Species that can’t interbreed, but have no significant differences in appearance.
= number of species becoming extinct per unit time.
The Earth has experienced 5 MASS EXTINCTIONS destruction, some scientists estimate that as many as 137 species disappear from the Earth EACH DAY, which adds up to an astounding 50,000 species disappearing every year.
Extinction Rates over geological time destruction, some scientists estimate that as many as 137 species disappear from the Earth EACH DAY, which adds up to an astounding 50,000 species disappearing every year.
Middle Cambrian age destruction, some scientists estimate that as many as 137 species disappear from the Earth EACH DAY, which adds up to an astounding 50,000 species disappearing every year.(about 540 million years ago)