What is a Species? What information do scientists use to define species?

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Presentation transcript:

What is a Species? What information do scientists use to define species?

Same or Different Species? Same or Different Species? Eastern Red-backed Salamander Led-back phase Red-back phase

Same or Different Species? Cope’s Gray Treefrog Gray Treefrog

What biological factor defines a species? Reproduction

What is a species? Groups of interbreeding populations that are reproductively isolated from other such groups

Tiger Lion Lions and tigers are reproductively isolated from each other

X Lion Tiger Hybrid = a cross between 2 species Liger

How many species are there? 1.7 million known species

Rank groups by abundance Bacteria Birds Fish Insects and Spiders Amphibians Mammals Other invertebrates Plants Reptiles

1 Mammals 5,416 2 Amphibians 6,200 3 Reptiles 8,240 4 Birds 9,934 5 Bacteria 10,000 6 Fish 29,300 7 Other invertebrates 168,000 8 Plants 287,655 9 Insects and Spiders 1,024,445

How many species are there? Estimated 2-10 million 15,000 new species/year 600 years to classify all species