Chapter 12 oceans and the environment
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Chapter 12: Oceans and the Environment PowerPoint PPT Presentation

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Chapter 12: Oceans and the Environment. Big Question: Can We Learn to Manage the Oceans’ Resources?. World Fish Production. The Decline of Fish Populations. Death of a Fishery. Case Study: Chesapeake Bay- A fishery disaster in the U.S. Other Problems. Highly polluted farm runoff.

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Chapter 12: Oceans and the Environment

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Chapter 12 oceans and the environment

Chapter 12: Oceans and the Environment

Big Question:

Can We Learn to Manage the Oceans’ Resources?

World fish production

World Fish Production

The decline of fish populations

The Decline of Fish Populations

Death of a fishery

Death of a Fishery

Case Study: Chesapeake Bay- A fishery disaster in the U.S.

Other problems

Other Problems

Highly polluted farm runoff.

Scientific theory remains inadequate

An ocean is many habitats and ecosystems

An Ocean Is Many Habitatsand Ecosystems

Where are the fish

Where Are the Fish?

Most fish we eat come from continental shelves.

Salmon anchovies and upwellings

Salmon, Anchovies and Upwellings

Managing ocean fisheries is difficult.

Salmon illustrate the problems of managing ocean fisheries. Many factors influence their birth and death rates.

Upwelling ocean currents

Upwelling Ocean Currents

Upwelling ocean currents affect smaller fish that salmon eat.

They bring nutrients, such as phosphorus, from deep ocean sediments and waters.

Coral reefs a special problem

Coral Reefs: A Special Problem

Reefs are restricted to warm waters and therefore low latitudes.

Coral reefs at risk

Coral Reefs at Risk

We love them to death. More than half of the remaining coral reefs are considered at risk.

We pollute the oceans

We Pollute the Oceans

Our wastes end up in the oceans.

Marine pollution

Marine Pollution

Marine pollution affects oceanic life in a variety of ways

Plastics are dumped into oceans, float with ocean currents, and accumulate in convergent currents (i.e. near the northwestern Hawaiian Islands.

Making ocean fisheries sustainable

Making Ocean Fisheries Sustainable

Problem: much of the open ocean is a “commons.”

Managing fisheries: there are four options:

1. Establish a total catch quota.

2. Issue a restricted number of licenses.

3. Tax fish brought in, or the effort.

4. Allocate fishing transfer/selling rights.

Marine sanctuaries

Marine Sanctuaries

Sanctuaries can be invaluable in helping populations recover.

Aquaculture and mariculture

Aquaculture and Mariculture

Fish produced by Aquaculture and Mari (marine) culture

Conservation of whales and other marine mammals

Conservation of Whales andOther Marine Mammals

Dolphins and other small whales

Dolphins and Other Small Whales

Source: Wikipedia

Chapter 12 oceans and the environment1

Chapter 12: Oceans and the Environment

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