A World of Water “Living in water” Unit 5, Topic 5

Not all habitats are the same Diversity Variety and number of species and organisms in a particular area The oceans have more that a million species These are spread through various habitats such as tide pools, coral reefs, deep oceans and shallow tide flats.

Lakes and ponds Lakes form in low areas and collect water. The sun usually reaches all depths of a lake and pond. This allows aquatic plants to grow Lake temperatures are usually consisitant

Use page 432 to add three further notes to this page on Lakes and ponds

Rivers and streams Usually shallow Contain sediments eroded from the river bed, shores and upstream areas Usually clear The moving water of rivers and streams creates special challenges for the organisms Describe some adaptations of invertebrates or plants in rivers. (P. 433)

Caddisfly Larve

Give three examples of adaptations in river organisms ____________________________________________________________________________________________________________________________________________________________________________________________________________

Oceans Largest aquatic habitat Salty, deeper and have much more water movement ie. Currents The great amount of aquatic life is in the TOP 180 M This is the average DEPTH that SUNLIGHT can penetrate Most marine organisms live in shallow water on the CONTINENTAL SHELF

Continental shelf

Aquatic adaptations Describe how each example above gets its OXYGEN __________________________________________________________________________________________

Adaptations Give examples how these organism adapt to the ever changing and moving water they live in.

Phytoplankton vs Zooplankton Floating plants Important source of food for other higher level organisms. 0.002 mm-2mm long Very important in producing OXYGEN Floating animal plankton Usually have very small spines or other appendages which help them move and float. Often clear

Light body Irregular shape Long spines Made of glass like substances called silica Help to keep the light and buoyant (afloat)

Create a Venn diagram of phytoplankton vs. Zoo plankton using p. 435

Deadly Box jelly fish

More adaptations

What other sea products do we use

Turbidity Measures the clearness of a water sample

Nutrient pollution Too many nutrients Algae –another aquatic plant Run off from land fertilizers Sewage Algae –another aquatic plant Algae bloom– is a population explosion of algae. As these plants die they drop to the bottom and get consumed by bacteria. This bacteria uses up all the OXYGEN in the water. = no O2 left for any other organism

Overfishing

Watch trailer for “the End of the Line” some disturbing scenes http://www.youtube.com/watch?v=bedirwk95Oc

Bioaccumulation in and Aquatic food chain