Species

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Species

  1. 1. BIOLOGICAL SPECIES CONCEPT<br />THE BILOGICAL SPECIES CONCEPT DEFINES A SPECIES AS MEMBERS OF POPULATIONS THAT ACTUALLY OR POTENTIALLY INTERBREED IN NATURE , NOT ACCORDING TO SIMILARITY OF APPEARENCE . ALTHOUGH APPERENCE IS HELPFUL IN IDENTIFYING SPECIES IT DOES NOT DEFINE SPECIES EXAMPLE:::…….THE IN CREDIABLE PURPLE FROG ( 24 SPECIES )<br />
  2. 2. APPERANCE ISN,T EVERYTHING <br />ORGANISAMS MAY APPEAR TO BE ALIKE AND BE DIFFERENT SPECIES EXAMPLE::WESTERN MEADOWLARKSAND ESTERN MEADOWLARKS<br />
  3. 3. APPEARANCE ISN,T EVERYTHING <br />ORGANISAMS MAY LOOK DIFFERENT AND YET TO BE ALIKE AND BE DIFFERENT SPECIES ..EXAMPLE:::: TWO ANTS OF THE SPECIES PHEIDOLE BARBATA<br />
  4. 4. separate species <br />What prevented the groups of frogs from interbreeding ?should we designate them as separate species ??<br />
  5. 5. Separate species<br />What do you do with asexual organisms? and what do you do with organisms that occasionally from hybrids with another? <br />
  6. 6. Ring specie s<br />Are species with geographic distribution that forms a ring and overlaps at ends. ex…..many subspecies of Ensatina salamanders in california<br />
  7. 7. CHRONO SPECIES<br />ARE DIFFERENT STAGESIN THE SAME EVOLVING LINEAGE THAT EXISTED AT DIFFERENT POINTS IN TIME .PRESENT PROBLEM FOR THE BIOLOGICAL SPECIES CONCEPT EXAMPLE:: TRILOBITE<br />
  8. 8. THANKS……..<br />FOR WATCHING…….<br />

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