Marine Ecology MAR 295 Prof. Pamela A. Lynch Introduction 5 Oceans This course and the “Scientific Method” Early findings on Oceanography

…I think I can…

Fig. 2.1

Fig. 2.2

Fig M An equatorial view of the world ocean.

A Different View of the Ocean Floor Fig. 1.5 (M) The major plates of the earth's crusts. Courtesy of Reto Stockli, NASA Earth Observatory

The Changing Marine Environment Fig. 1.3 A summary of some biological and physical milestones in the early development of life on Earth. The blue curve represents the relative diversity of life; the orange curve represents the oxygen concentration of the atmosphere. Several of the terms used here are defined in Chapter 2.

The Scientific Method -Used to help you “see” while you understand… -Are these organisms different to you? (why?)

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Fig How does this apply to MARINE ECOLOGY?

How did the earth (and the oceans? and life?) form?

Origin of our Solar System (5 bya)

The Milky Way Galaxy; which contains our solar system (and planet)

Hot gas filament (from the Sun)

Outgassing (volcanism): Source of our early oceans?

Or comets (delivering surface water)?

Hydrothermal vent (mineral surface): 1 st life on earth?

Bacterial fossil, 3.5 bya

Fig. 1-18, p. 16

Now that we have thought about how the oceans may have formed we can study them! What have we found? -- Soundings/Bathymetry tells us depth and topography and what lives on the bottom of the ocean floor -- Geology tells us about our 3 layers and density -- there’s still so much we don’t know…

Fig. 1.5 You can look at the “surface”

Fig. 1.7 Or go MUCH deeper…

Seeing in the Dark –Water is nearly opaque to light, yet very transparent to sound. Fig. 1.12M A multiple-beam sonar image of the coastal margin of southern California. Courtesy NOAA

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