Titchwell Marsh, Nortb Norfolk Flashcards Preview

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Flashcards in Titchwell Marsh, Nortb Norfolk Deck (26)
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1
Q

List 4 species that are present at Titchwell Marsh

A

Breeding bittern
Marsh harrier
Breeding avocet
Overwintering birds

2
Q

What problem has long shore drift caused?

A

Erosion of the seaward side of the reserve

3
Q

When did long shore drift have a large effect on the marsh?

A

In the 1990s

4
Q

Where does long shore drift move sediment to?

A

Towards Scolt Head Island

5
Q

How many tourists visit the marsh each year?

A

90,000

6
Q

What coastal management strategy is being used to protect t the marsh?

A

Managed retreat

7
Q

What is managed retreat?

A

The abandonment of the current line of sea defences and then developing the exposed land so that it can be reclaimed naturally and act as a defence.

8
Q

How much of the Titchwell Marshes have been given up to protect the rest of the sanctuary?

A

Up to a third

9
Q

Why would salt water damage the reserve?

A

It is a freshwater habitat

10
Q

What are the species at the marsh like?

A

Rare

11
Q

How much did the RSPB spend on managed retreat and new sea walls?

A

£1.4m

12
Q

What type of land has the erosion of the coast put in danger?

A

Brackish marshes, freshwater marshes and reedbeds

13
Q

What are brackish marshes?

A

Salt marshland that is diluted with freshwater

14
Q

What could storm surges do at high tide?

A

Breach the current sea walls

15
Q

In 2008 how much of the salt marsh did the sea walls protect?

A

138 acres of the site

16
Q

How many acres of brackish marsh will return to salt marsh and mudflats exposed to the tide due to managed retreat?

A

27acres

17
Q

How long will this scheme protect the marshes for?

A

50 years

18
Q

When was the site made an SSSI?

A

1973

19
Q

What did the RSPB also intend to do in terms of protecting species?

A

Crate more island nesting sites for breeding avocets and more reedbeds for bitterns

20
Q

Where do breeding avocets nest?

A

In the freshwater part of the reserve

21
Q

What type of grass can be found on the mudflat and is a pioneer species?

A

Cordgrass

22
Q

Why is cordgrass not swept away by the tide?

A

It has long roots which trap and stabilise the mud

23
Q

How was the marsh created?

A

By building sea walls to enclose areas of grazing marshes and salt marches to form a range of different habitat types.

24
Q

What threat do rising sea levels pose for sea walls?

A

It increases the likelihood of the sea walls overtopping

25
Q

What is salt water inundation?

A

When salt water mixes with freshwater usually following flooding.

26
Q

What does salt water inundation harm?

A

Plants and animals that rely on freshwater to survive