Bell ringer Over time, the climate of an island became drier, which resulted in changes to the populations of various island finch species. Finch populations.

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Presentation transcript:

Bell ringer Over time, the climate of an island became drier, which resulted in changes to the populations of various island finch species. Finch populations with a certain beak shape thrived, while those not having that beak shape decreased. Which of the following describes a necessary condition for these changes in the finch populations to occur? A. fewer mutations B. limited food resources C. limited beak variations D. overproduction of offspring

Bell ringer number two Mutations within a DNA sequence are A. natural processes that produce genetic diversity B. natural processes that always affect the phenotype C. unnatural processes that always affect the phenotype D. unnatural processes that are harmful to genetic diversity

Bell ringer number three What happens to light as you go deeper into the ocean? What happens to pressure as you go deeper into the ocean?

17.2 Aquatic Ecosystems

As I get deeper in the ocean… OR As I get deeper in the ocean… What I think… What really happens… Temperature Salinity Light Penetration Have students copy table on their left page and predict what will happen to each condition as you get deeper in the ocean (INCREASES OR DECREASES) Fill out last column for GUIDED PRACTICE

Engage Characteristics of fish depend on the depth they live in! Angler Fish Clip http://www.youtube.com/watch?v=fMTHrvskSW8

Debrief Engage Why does it have a light attached to it’s head? Was there a lot of sunlight? Why is the Angler Fish’s teeth/mouth so big? No Because of the lack of sunlight, the Angler Fish needs to have a big mouth to increase it’s chances of capturing prey.

Explore Name some marine ecosystems you know: Coral Reefs, Deep-Sea Thermal Vents, Open Ocean, Estuaries, Marshes, etc. What abiotic conditions define, affect, and distinguish these systems? Sunlight, Temperature, Salinity, Depth, etc.

NOTES

Aquatic ecosystems is an ecosystem in water. KEY POINT #1 Aquatic ecosystems is an ecosystem in water. Aquatic systems are shaped by abiotic factors including salinity, depth, temperature, sunlight and chemistry

KEY POINT #2 Depth: how far you are from shore level Deeper=less light, colder Salinity: concentration of salt dissolved in water Deeper=more salt

CFU Which species can survive best in cold environments? Species A Which species is least affected by temperature? Species C

CFU What happens to temperature as depth decreases? Increases Why?

CFU Which species needs light to survive? Which species is best adapted to deep depths? If needed…

KEY POINT #3 Humans can affect pH levels of aquatic ecosystems. TALK ABOUT HUMANS POLLUTING THE ENVIRONMENT AND THEREFORE CHANGING PH LEVELS…

As I get deeper in the ocean… Finish Table… As I get deeper in the ocean… What I think… What really happens… Temperature Salinity Light Penetration FINISH TABLE

Glue the graph into your notebook

Reefs at Risk