3. Life
There are 250,000 known species
of marine plants and animals, many
are food for other organisms, like
us.
4. Temperature
Solar heat is distributed by ocean currents &
as ocean water evaporates.
The oceans are major players in the earth’s
climate & are a gigantic reservoir for carbon
dioxide; therefore they help regulate the
temp. of the troposphere.
5. Zones of the Marine
Environment
Two major zones that break
up into smaller zones –
coastal and the open sea
14. Definition
An estuary is a coastal body of
water, partly surrounded by land,
with access to the open ocean and
a large supply of fresh water from
a river
17. Salinity
Salinity fluctuates with tidal cycles,
the time of year, & precipitation.
The organisms that live here must
be able to tolerate these conditions
18. Fertility of Estuaries
Estuaries are the most fertile
ecosystems in the world
Greater productivity than either the
adjacent ocean or the fresh water
upriver
19. Reasons for High Fertility
Nutrients are transported from the land into
rivers that flow into the estuary
Tidal action circulates nutrients and helps
remove wastes
A high level of light due to shallow water
Many plants provide an extensive
photosynthetic carpet
22. Difficulties
Sandy beach – Life must deal with a shifting
environment that threatens to engulf them & no
protection against wave action. Most animals
bury into the sand. They move with the tides,
so they’re always underwater & don’t dry out.
23. Difficulties (Continued)
Rocky shore – high wave action at high tide;
drying out & temperature changes during low.
Animals have a way of sealing in moisture like
a shell & find a way to cling to the rocks so they
don’t get washed away with waves.
25. Pelagic
The open ocean environment;
divided into neritic (open ocean
from the shoreline to a depth of
200m) and oceanic provinces
(depths > 200m).
29. Benthic Characteristics
The ocean floor consists of sediments
(mostly sand and mud)
Many marine animals, like worms and
clams, burrow
Bacteria are common & can go down 500
meters below ocean floor. The Benthic
environment extends from the shore to
the deep.
31. Location of sea grass
Found in shallow water to depths of
10 meters where they can
photosynthesize. Sea grasses are
found in quiet, temperate, tropical,
and subtropical waters; not in polar
waters.
Eel, turtle, and manatee grass.
Examples
32. Ecological Importance
Reduce surface erosion, provide
food, & provide habitats for many
marine organisms.
Animals that eat sea grass are
manatees, green turtles, parrotfish,
sturgeon fish, and sea urchins.
33. Abyssal Zone
Completely dark.
Extends to a depth
of 4000 to 6000
meters (2.5 to 3.7
miles). Water here
is very cold & has
little dissolved
oxygen.
34. Kelp
The largest of the brown algae, many reach
lengths of 60 meters (200 feet). Common in
cooler water & are found along rocky coasts.
Provide habitat for many animals like
tubeworms, sponges, clams, fish, & mammals.
Some animals eat the kelp.
35. Characteristics
Built from layers of calcium carbonate,
coral reefs are found in warm, shallow sea
water. The living portions must grow in
shallow waters where light hits. They are
the most diverse of all marine ecosystems.
Coral Reefs
36. Examples
Many coral reefs are made of red coralline
algae that photosynthesize.
Others have zooxanthellae (symbiotic algae)
that live and photosynthesize in their tissues.
Not all corals have zooxanthellae, but only
those with it build reefs.
Coral animals also capture food at night with
stinging tentacles that paralyze zooplankton
and small animals that drift nearby.
37. Coral Reef Waters
The waters where coral reefs are
found are often poor in nutrients.
Yet, other factors are favorable
such as temperature, sunlight year
round, and zooxanthellae.
40. Fringing Reef
The most common type of coral
reef. It is directly attached to
the shore of a volcanic island or
continent.
41.
42. Fringing Reef Bora Bora NASA JPL Satellite: Space Shuttle Sensor: SIR-C/X-SAR
43. Atoll
A circular reef that surrounds a
central lagoon of quiet water.
An atoll forms on top of the cone of
a submerged volcanic island.
More than 300 atolls are found in the
Pacific and Indian Oceans.
47. Barrier Reef
A lagoon of open water separates
the land from the barrier reef.
The largest barrier reef is the Great
Barrier Reef off the coast of
Australia.
The second largest is off the coast
of Belize.
48.
49.
50. Provides a Habitat
Provides a habitat for a wide
variety of marine organisms.
Ecological Importance
of Coral Reefs
53. Coral Reef Risks
Of the 109 countries with large reefs,
90 are damaging them, and 27% of
the coral reefs are at high risk,
especially off the coast of
Southeastern Asia.
In the western Atlantic, 30-50% of
all coral species are either rare or
endangered.
54. Coral Reef Risks Con’t
Silt washing from downstream has
smothered the reefs
High salinity from fresh water diversion,
over-fishing, boat groundings, fishing
with dynamite or cyanide, hurricane
damage, disease, coral bleaching, land
reclamation, tourism, and the mining of
coral for building materials.
56. Protection of
300 coral reefs in 65 countries are
protected as reserves or parks, and
another 600 have been
recommended for protection.
The good news is coral reefs can
often recover from damage.
59. African Proverb
“Water may flow in a thousand
channels, but it all returns to the
sea.”
The oceans are the ultimate sink
for much of the waste matter we
produce.
60. Differences of Opinion
Oceans dilute, disperse, and degrade large
amounts of raw sewage, sewage sludge, oil,
and some types of industrial waste, especially
in deep-water areas.
Marine life has proved to be more resilient
than some scientists expected, some suggest it
is safer to dump sludge & other hazardous
wastes into the deep ocean than to bury them
on land or burn them.
61. Differences of Opinion
Other scientists disagree, pointing
out that we know less about the
deep ocean than we do about
space. They say that dumping
waste in the ocean would delay
urgently needed pollution prevention
and promote further degradation of
this vital part of the earth’s life-
support system.
62. Oil Spills
When a tanker accident happens, it gets lots
of publicity.
But, more oil is released by normal operation
of offshore wells, washing tankers & from
pipeline or storage tank leaks.
One estimate says that oil companies spill,
leak, or waste per year an amount of oil
equal to that shipped by 1000 huge Exxon
Valdez tankers.
63. Floating Oil
Oil coats the feathers of birds (especially
diving birds) and the fur of marine
animals, destroying the animals’ natural
insulation and buoyancy
Many drown or die of exposure from loss
of body heat.
64. Other Information
Oil is broken down by bacteria over time;
slower in cold waters.
Heavy oil components can smother bottom-
dwelling organisms such as crabs, oysters,
mussels, and clams, or make them unfit to eat.
Oil spills have killed coral reefs. A recent study
showed that diesel oil becomes more toxic to
marine life with the passage of time.
66. Mechanical Methods
Floating booms contain the oil spill or keep it
from reaching sensitive areas
Skimmer boats are used to vacuum up some of
the oil into collection barges
Absorbent pads or large feather-filled pillows
are used to soak up oil on beaches or in waters
that are too shallow for skimmer boats
67. Chemical Methods
Coagulating agents cause floating oil to clump
together for easier pickup or sink to the
bottom, where it usually does less harm.
Dispersing agents break up oil slicks. However,
these can also damage some types of
organisms.
Fire can also burn off floating oil, but crude oil
is hard to ignite.
