1 / 11

Daphnia

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

yan
Download Presentation

Daphnia

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Daphnia Lesson 16 Notes

  2. I. Basic Info • Freshwater Crustacean • Three part body • Head, thorax, abdomen

  3. 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

  4. eggs

  5. 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

  6. 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)

  7. Daphnia heart rate http://www.youtube.com/watch?feature=player_detailpage&v=oWWEwwlsgKo

  8. Daphnia Heart rate experiment with caffeine and alcohol solutions http://www.youtube.com/watch?feature=player_detailpage&v=cb0eZ63EUs0

More Related