Describe the lower marsh stage of halosere succession.

The lower marsh is regularly inundated by tides and supports halophytic species that continue to trap sediment and raise the marsh surface.

What conditions and vegetation characterise the middle marsh zone?

The middle marsh experiences less frequent tidal flooding and supports a greater diversity of salt-tolerant plants as sediment accumulation continues.

How does the upper marsh differ from lower zones in halosere succession?

The upper marsh is only flooded by the highest tides, allowing less salt-tolerant species to colonise as salinity decreases.

Edexcel A-Level Geography 9GE0

Tectonic Processes and Hazards

Topic overview Global distribution of tectonic hazards and plate boundary processes The structure of the Earth and mantle convection Ridge push, slab pull and sea-floor spreading Destructive and constructive plate margins Collision and transform margins Magma composition and eruption style The Benioff zone and earthquake magnitude Seismic waves and their effects Volcanic hazards and tsunamis Hazard, vulnerability, resilience and the risk equation The Pressure and Release model The impacts of tectonic hazards Measuring hazards, and the hazard profile Speed of onset, areal extent, duration and predictability Why impacts differ between countries Education, buildings, healthcare and income as factors in vulnerability Governance at local and national level Population density, isolation and urbanisation How development level shapes disaster outcomes Trends in tectonic disasters, data reliability and sampling Mega-disasters and multiple-hazard zones Theoretical frameworks for prediction, impact and management Land-use zoning and hazard-resistant design Monitoring, prediction, preparedness and aid

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Coastal Landscapes and ChangeLandscape

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Migration, Identity and SovereigntyConnections

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Coastal Landscapes and Change

Halosere succession and rates of recession

3 things to know
Paper 1

Overview

Recall questions on the salt marsh zones and their pioneer species, and on calculating rates of coastal recession.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Evaluation

What characterises the pioneer zone in salt marsh succession?

Evaluation

What is the climax community in salt marsh succession?

Key term

What is halosere succession?

Questions from this subtopic

Each one with the model answer underneath.

1
What is halosere succession?
Model answer
Halosere succession is the sequence of plant communities developing in salt marsh environments, from pioneer halophytes to climax vegetation.
2
What characterises the pioneer zone in salt marsh succession?
Model answer
The pioneer zone is colonised by algae and glasswort, which tolerate regular tidal submersion and begin trapping fine sediment.
3
Describe the lower marsh stage of halosere succession.
Model answer
The lower marsh is regularly inundated by tides and supports halophytic species that continue to trap sediment and raise the marsh surface.
4
What conditions and vegetation characterise the middle marsh zone?
Model answer
The middle marsh experiences less frequent tidal flooding and supports a greater diversity of salt-tolerant plants as sediment accumulation continues.
5
How does the upper marsh differ from lower zones in halosere succession?
Model answer
The upper marsh is only flooded by the highest tides, allowing less salt-tolerant species to colonise as salinity decreases.
6
What is the climax community in salt marsh succession?
Model answer
The climax community typically consists of terrestrial vegetation such as scrub or woodland that develops when the marsh surface is rarely flooded.

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Globalisation

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