Daphnia
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Daphnia. Lesson 16 Notes. I . Basic Info. Freshwater Crustacean Three part body Head, thorax, abdomen. II. Gender. Mostly female Can lay up to 400 eggs Two types of eggs Summer eggs Parthenogenetically – without fertilization Within broad chamber Winter eggs Fertilized by male

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Daphnia

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Daphnia

Daphnia

Lesson 16 Notes


I basic info

I. Basic Info

  • Freshwater Crustacean

  • Three part body

  • Head, thorax, abdomen


Ii gender

II. Gender

  • Mostly female

  • Can lay up to 400 eggs

  • Two types of eggs

    • Summer eggs

      • Parthenogenetically – without fertilization

      • Within broad chamber

    • Winter eggs

      • Fertilized by male

      • Released by female and then hatch in summer

      • Always contain female Daphnia that will reproduce parthenogenetically


Daphnia

eggs


Iii structures

III. Structures

  • 2 pair antennae

    • 1 large pair for movement

  • Single compound eye

  • 5-6 2-branched appendages from thorax

    • Feeding of algae and phytoplankton

  • Digestive tube from mouth to anus

    • Often green from phytoplankton

  • Heart

    • Open circulatory system (blood not confined in vessels)

    • Gas exchange


Iv heart rate

IV. Heart Rate

  • Averages 230-300 beats per minute

  • HR increases with

    • Increase in light

    • Increase in temperature

    • Caffeine (stimulant)

    • Nicotine

  • HR decreases with

    • Alcohol (depressant)


Daphnia heart rate

Daphnia heart rate

http://www.youtube.com/watch?feature=player_detailpage&v=oWWEwwlsgKo


Daphnia heart rate experiment with caffeine and alcohol solutions

Daphnia Heart rate experiment with caffeine and alcohol solutions

http://www.youtube.com/watch?feature=player_detailpage&v=cb0eZ63EUs0


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