Aquatic Life – Invertebrate Animals

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Presentation transcript:

Aquatic Life – Invertebrate Animals In this unit we will introduce characteristics of aquatic organisms and focus on invertebrate animals (that lack a backbone). Photo Credit: Photograph by Chris Newbert/Minden Pictures

Characteristics of Animals eukaryotic cells have a nucleus and specialized organelles No cell wall multicellular heterotrophs

Essential Functions Homeostasis Feeding/Excretion Support/Movement Respiration/ Circulation Response to Environment Reproduction http://photography.nationalgeographic.com/photography/photos/schools-fish/school-of-grunt-fish-photography.html

Feeding and Excretion Animals must find, consume, and digest food for energy. They must also get rid of waste products. Just as the machines in a factory produce waste, the cells of organisms often produce a “trash” substance called ammonia which is poisonous. The excretion (to get rid of) of wastes from the body varies between organisms. http://photography.nationalgeographic.com/photography/photos/colorful-sea-creatures/pygmy-seahorse-doubilet.html

Support & Movement http://photography.nationalgeographic.com/photography/photos/underwater-scenes/basket-sea-star-photography.html Most animals are active and require energy for movement. Some animals are sessile, or permanently attached to one spot (EX sponges). Most animals are motile and are free-moving at some time in their life cycle (which allows offspring to settle in a new place). Some animals are passive and move only when carried by another force such as water currents or wind.

Respiration & Circulation Animals must have oxygen to release energy within cells. Some animals use lungs while some aquatic animals use gills to bring in oxygen and get rid of the CO2 byproduct of cellular activity. Others use diffusion to pass the gases in and out of their body. http://www.tunalab.unh.edu/IMAGES/gills.jpg

Response Animals must be aware of their environment to obtain food seek protection from predators find mates and reproduce Animals respond to their environment using specialized nerve cells to sense external stimuli (light, sound, etc) process information. EX The shark using senses.

Reproduction Animals must reproduce to maintain the species. Most reproduce sexually using sperm and an egg. Some can reproduce asexually (from just one parent). http://z.about.com/d/biology/1/0/-/2/pbear.jpg

Animal Body Symmetry Radial symmetry – arrangement of body parts around a central point EX starfish Bilateral symmetry – arrangement of body parts along a plane EX heart, centipede). Asymmetry – lack of symmetry EX sponge http://www.biologycorner.com/resources/symmetry_comparison.gif

Invertebrates vs. Vertebrates The animal kingdom is divided into two main groups: Invertebrates (97%)– without backbones Vertebrates (3%) – with backbones http://www.bbc.co.uk/schools/revisewise/images/science/liv03b/03bfimg1.gif

Invertebrate Phyla Porifera (sponge) Cnidaria (sea anemone) Platyhelminthes (flatworm) Nematoda (roundworm) Annelida (segmented worm-earthworm) Mollusca (snail) Echinodermata (sea star) Arthropoda (butterfly, crustaceans)