Unit 4: Ocean issues and resource management

12 dot points, in syllabus order. Each dot point has a focused answer, with exam-style questions and worked answers where available.

How does aquaculture work and can it provide seafood sustainably?

Describe aquaculture and its main methods, explain its benefits and environmental impacts, and evaluate its sustainability compared with wild-capture fisheries using Australian examples

QCE Marine Science Unit 4 sub-topic on aquaculture. Describes the main aquaculture methods, weighs benefits against impacts such as pollution, escapes and disease, and evaluates its sustainability against wild fishing, with Australian examples.

6 min read →

What makes a fishery sustainable and how are overfishing and bycatch managed?

Explain overfishing and bycatch, describe the methods used to manage fisheries sustainably (quotas, size and gear limits, seasons), and evaluate their effectiveness using Australian examples

QCE Marine Science Unit 4 sub-topic on sustainable fishing. Explains overfishing, bycatch and maximum sustainable yield, and evaluates management tools such as quotas, size limits, gear rules and bycatch reduction devices, using Queensland fishery examples.

7 min read →

How do marine protected areas and zoning work, and how effective is the Great Barrier Reef Marine Park zoning plan?

Describe how marine protected areas and zoning manage human use, and evaluate the effectiveness of the Great Barrier Reef Marine Park zoning plan using evidence

QCE Marine Science Unit 4 sub-topic on marine protected areas. Explains how MPAs and multi-use zoning work, evaluates the Great Barrier Reef Marine Park zoning plan and the 2004 rezoning, and weighs the benefits and limits of spatial protection.

7 min read →

How does the ocean store and cycle carbon and why does this matter for climate?

Describe the ocean as a major carbon sink, explain the solubility and biological carbon pumps and the role of blue carbon, and explain how a warming ocean affects carbon uptake

QCE Marine Science Unit 4 sub-topic on the ocean carbon cycle. Explains the ocean as a carbon sink, the solubility and biological pumps, blue carbon in mangroves and seagrass, and how warming reduces carbon uptake, with Australian examples.

6 min read →

How do human activities degrade marine environments and what processes are involved?

Describe the major human impacts on marine environments (pollution, runoff, plastics, dredging, crown-of-thorns outbreaks, coastal development) and explain the processes by which they degrade ecosystems such as the Great Barrier Reef

Human impacts. Describes pollution, agricultural runoff, plastics, dredging, crown-of-thorns outbreaks and coastal development, and explains how each degrades marine ecosystems, with Great Barrier Reef examples.

6 min read →

Why is sea level rising and how does it threaten coasts and coastal ecosystems?

Explain the causes of sea level rise (thermal expansion and ice melt), describe its impacts on coastlines and coastal ecosystems, and evaluate adaptation responses using Australian examples

QCE Marine Science Unit 4 sub-topic on sea level rise. Explains thermal expansion and ice melt, describes impacts such as inundation, erosion and saltwater intrusion, and evaluates adaptation responses, with Australian and Torres Strait examples.

7 min read →

How do plastics, oil and excess nutrients pollute marine systems and harm marine life?

Describe the major types of marine pollution (plastics, oil, nutrients and sediment) and explain their sources, impacts and the mechanism of eutrophication, using Great Barrier Reef examples

QCE Marine Science Unit 4 sub-topic on marine pollution. Covers plastic and microplastic, oil spills, and nutrient and sediment runoff, and explains the mechanism of eutrophication and its effects on the Great Barrier Reef.

6 min read →

What drives global ocean circulation and how does the East Australian Current affect Australian seas?

Explain how surface and deep ocean circulation are driven by wind, density and the Coriolis effect, and describe the East Australian Current and the global thermohaline conveyor

QCE Marine Science Unit 4 sub-topic on ocean circulation. Explains wind-driven surface gyres, the Coriolis effect, the thermohaline conveyor and upwelling, and details the East Australian Current and its poleward extension under warming.

7 min read →

What causes coral bleaching, what happens to the reef, and can it recover?

Explain the physiological mechanism of coral bleaching, describe the conditions that trigger mass bleaching, and evaluate the prospects for reef recovery using Great Barrier Reef events

QCE Marine Science Unit 4 sub-topic on coral bleaching. Explains the breakdown of the coral-zooxanthellae symbiosis under heat stress, the triggers and thermal thresholds, and the prospects for recovery, using Great Barrier Reef mass bleaching events.

6 min read →

How is climate change altering oceans and what are the consequences for marine ecosystems?

Explain how rising carbon dioxide drives ocean warming, coral bleaching, ocean acidification and sea level rise, and describe the consequences for marine ecosystems such as the Great Barrier Reef

Climate change. Explains how rising carbon dioxide drives ocean warming, coral bleaching, acidification and sea level rise, and the consequences for marine ecosystems, with Great Barrier Reef mass bleaching examples.

6 min read →

How do tides, waves and currents move water, sediment and nutrients, and shape coastlines?

Explain the causes of tides, waves and ocean currents, and describe how water movement transports sediment and nutrients and shapes coastlines through erosion and accretion

Water movement. Explains the gravitational cause of tides, how wind generates waves, what drives ocean currents, and how longshore drift, erosion and accretion shape coastlines, using Queensland and East Australian Current examples.

7 min read →

How are fisheries and marine resources managed sustainably for the future?

Explain the concepts of maximum sustainable yield, overfishing and bycatch, and evaluate fisheries and marine management strategies (quotas, marine protected areas, zoning) using Australian examples

Fisheries management. Explains maximum sustainable yield, overfishing and bycatch, and evaluates management strategies such as quotas, marine protected areas and Great Barrier Reef zoning, with Australian examples.

6 min read →