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Lecture 19

BIO152H5 Lecture Notes - Lecture 19: List Of Trapdoor Spiders, Sympatric Speciation, Ecotype

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Fiona Rawle

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Orca Speciation
- Hunt in packs
- The strategies change dep
- Large dorsal fins
- Black, white eye patches
- Culture (social, talk to each other)
- Known as killer whale (largest species of dolphin)
- Most widespread mammal after humans (found throughout all ocean)
- Largest predator of warm blooded mammals
- Transient orcas (along coast, eat marine mammals ex. seals)
- Resident orcas (eat fish)
- Ecotypes & Forms
- Southern hemisphere
- Northern hemisphere
- Difference in ecotype
- Diversity in behavior (most)
- Diversity in dorsal size fin, or eye patches
- Do Orcas represent a same species?
- Sympatric speciation (culture played a big role in reproductive isolation)
- Vocalization
- Loud ones (salmon) & quiet ones (mammals)
- Jaw morphology
- Transient - thicker (eat mammals)
- Resident - gracile (eat salmon)
- Orcas are near land
- Mechanism (how)
- How does behavior increase fitness (why)
Sexual cannibalism
- One sex consumes the other sex during reproduction
- Trapdoor spider
- Jumping Spider
- Courtship dance
- The female can refuse the male and eat them afterward
- Australian redback spider
- Male inserts its palp into the sperm receptor of the
- Females cannibalize the males during copulation
- Females only eat the male after its somersaults in front of her jaws
- The hungrier the female is , the more likely to eat the mate
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