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CHESAPEAKE BAY

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Estuaries have more food for organisms, but the organisms ... Plankton Community. The plankton community includes the drifters of the Bay. Plankton Community ... – PowerPoint PPT presentation

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Title: CHESAPEAKE BAY


1
CHESAPEAKE BAY
2
Chesapeake as an Estuary
  • An estuary is a semi-enclosed body of water that
    has a free connection with the sea
  • .

3
Chesapeake as an Estuary
  • Estuaries have more food for organisms, but the
    organisms usually have to deal with large
    temperature and salinity changes, high silt
    content and pollution.

4
Why do you think high silt would be a problem for
marine organisms?
  • Hint How does this organism get its food?

5
Many marine organisms are filter feeders so silt
can be a major problem.
6
Many of these filter feeders are important as
food to humans.
7
Colonization of Estuaries
8
  • Estuaries are regions of transition and sharp
    gradients.
  • Estuaries support fauna recruited mostly from the
    sea

9
  • The number of species in an estuary is greatly
    reduced, but the number of individuals is large.
  • What does that mean? Can you explain that last
    statement?

10
The Answer
  • For those organisms that can survive the problems
    of the estuary, there is a great deal of food.

11
The Answer
  • These organisms tend to be in large numbers.

12
Estuary Types
  • The Chesapeake Bay is a drowned river valley.
    This is the most common type of estuary. It was
    formed during the last ice age some 12,000
    18,000 years ago.

13
Estuary Types
  • The Chesapeake Bay is a drowned river valley.
    This is the most common type of estuary. It was
    formed during the last ice age some 12,000
    18,000 years ago.
  • There are other types of estuaries. Can you name
    any of them?

14
Bar-Built Estuaries
  • These are found where sand bars and barrier
    islands form.

15
Bar-Built Estuaries
  • The shallow water behind these barrier islands
    forms low salinity estuaries.

16
Tectonic Estuaries
  • These estuaries form where land sank or subsided.

17
Tectonic Estuaries
  • A good example of this type of estuary is San
    Francisco Bay.

18
Do you know the name of the last type of estuary?
  • Think Ice!

19
Fjords!
  • Fjords were created when retreating glaciers cut
    deep in the earth.

20
Fjords!
  • Where in the United States might we find fjords?

21
Facts About The Chesapeake Bay
22
The Chesapeake Bay is the largest estuary in the
United States.
23
The bay is shallow. Can you guess its average
depth?
  • 106 ft.
  • 56 ft
  • 32 ft.
  • 21 ft.
  • 14ft.
  • 9ft.

24
THE ANSWER!
  • 21 feet is the correct answer. The deepest spot
    in the bay is 174 feet near Annapolis Md.

25
A watershed is the drainage area for the bay.
  • Can you name the 6 states that make up the
    watershed of the Chesapeake Bay?

26
  • Virginia
  • Maryland
  • West Virginia
  • Delaware
  • New York
  • Pennsylvania

27
Can you name the 5 major rivers that flow into
the bay?
  • From South to North
  • James
  • York
  • Rappahannock
  • Potomac
  • Susquehanna

28
Which of those 5 rivers contributes the most
fresh water to the bay?
  • The Susquehanna River provides about 50 of the
    fresh water coming into the Bay.
  • The river empties an average of 19 million
    gallons of water per minute.

29
Can you name a mammal that is named after the Bay?
  • Think you know?
  • The Chesapeake Bay Retriever

30
The Bay area is home to over 15,000,000 people!
  • About 50,000 commercial vessels enter the Bay
    each year.

31
The Bay area is home to over 15,000,000 people!
  • All these people and activities put a strain on
    the Bay ecology.

32
Bay Organisms
  • The Bay is home to over 3600 living organisms!

33
Marsh Dwellers
  • Marsh dwellers are located in and around marshes.
    They include small fish, birds, and marsh grasses.

34
SAV Communities
  • Submerged Aquatic Vegetation Communities are
    important for many reasons. They include ducks,
    crabs, and eelgrass.

35
Plankton Community
  • The plankton community includes the drifters of
    the Bay.

36
Plankton Community
  • It includes phytoplankton, bacteria, and
    zooplankton.

37
Benthic Communities
  • Benthic refers to the bottom of the Bay. Benthic
    organisms include oysters, clams, barnacles, and
    mud crabs.

38
Nekton Communities
  • Nekton refers to the swimmers of the Bay.

39
Nekton Communities
  • Croaker, Spot, and menhaden use shallow water in
    the Bay as a nursery
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