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Lab 9 - Exam Review.docx

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McGill University
Biology (Sci)
BIOL 111
Suzanne Gray

LAB 9 – ANIMAL PHYSIOLOGY AND EVOLUTION Metabolic Physiology of an Aquatic Invertebrate  Cladocerans are a group of aquatic crustaceans called “water fleas” due to their jerky swimming motiong  Members of the zooplankton community  The small invertebrates are an important component of the food web. Not only are they food for other invertebrates such as hydra and vetebrates such as fish, but they feed on phytoplankton and bacteria suspended in the water column Phylum Arthropoda  Class Crustraceans  Daphnia Magna Structures:  Compound eye: single compound eye moved by muscles  Carapace: transparent exoskeleton, dorsally hinged, molted  Antennae: large, biramous (branch), main swimming structures, used like oars  Posterior spine: quite long, reduces chance of being eating by small predators, length can change throughout seasons (after molts) depending on level of predation threats  Digestive tract: C-shaped gut; color of tract is good indicator of food type being consumed  Heart: transparent pumping organ located dorsal to the digestive tract  Thoracic legs: 5 pairs located under the opening of the carapace, used for generating water currents and filter feeding; food trapped on filtering setae (hairs) on legs  Post-abdominal claw: used to remove debris from under the carapace  Brood Pouch: dorsal sac at the end of the oviduct (contains 2-20 eggs which develop by parthenogenesis) eggs hatch inside brood pouch then emerge from female o Parthenogenisis: asexual reproduction  development of egg without fertilization
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