Marine Food Web - Welcome to SEPUP: Science Education for Public

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Science & Global iSSueS/ecoloGY TRanSPaRencY 6.1

Marine Food Web

3299 SEPUP SGI Ecology TGFigure: 3299EcoTG 06_01TransAgenda MedCond, 9/9

shark seal

tuna

flying fish striped fish

phytoplankton

zooplankton

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Fish Tank Problem

The biomass of all of the goldfish in a fish tank is approximately 30 g. If the average weight of the gold-fish in the tank is 3 g, how many goldfish are in the tank?

30g 1 fish 10 fish tank 3 3 g 5 tank

If each goldfish eats 0.025 g of fish food per day, how much fish food would the entire fish tank need each day?

10 fish 0.025 g food a day 0.25 g food a day tank 3 fish 5 tank

If 20% of the fish in the tank died, what is the remaining biomass of the goldfish in the tank?

30g tank 3 0.80 5 24 g biomass of goldfish remaining

How many goldfish is that?

1 fish 24 g biomass 3 3 g 5 8 fish

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Organisms in a Freshwater Ecosystem

3299 SEPUP SGI Ecology TGFigure: 3299EcoTG 07_09Trans7_1Agenda MedCond, 9/9.5

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Food Web for an Ecosystem

3299 SEPUP SGI Ecology TGFigure: 3299EcoTG 07_09TransAgenda MedCond, 9/9.5

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Kelp Forest Food Web

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phyt

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sea

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rha

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pac

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elp

rock

fish

herri

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Carb

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oil r

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coal

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plan

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foss

il fu

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Linear Growth Curve

3299 SEPUP SGI Ecology TGFigure: 3299EcoTG 14_06TransAgenda MedCond 9/9.5

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Exponential Growth: J-Curve


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Carrying Capacity: S-Curve


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Population Crash


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Pacific Halibut Population

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Population level (relative)

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1995

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Pacif

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Pacific Halibut Food Chain

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Pacific-halibut-dominated Ecosystem Graph

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Population level (relative)

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2010

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Pacif

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Marine Food Web - Welcome to SEPUP: Science Education for Public

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