Influencing the distribution of productivity in the ocean. Ocean productivity What does ocean productivity need? What does ocean productivity need? Major Players in ocean productivity

1. INFLUENCING THE
DISTRIBUTION OF
PRODUCTIVITY IN THE
OCEAN
MD. NAIMUR RAHMAN KHAN
Dept. of Geography & Environment
Jahangirnagar University
Secession: 2017-2018 (47th Batch)
Savar, Bangladesh
khan.47@geograhy-juniv.edu.bd

2. OCEAN PRODUCTIVITY
• Largely refers to the production of organic matter by
"phytoplankton," plants suspended in the ocean, most of which
are single-celled.
• Throughout the history, people were directly or indirectly affected
by the ocean. Ocean Waters works as a source of food and
valuable minerals as a large expressway for trade, and offers a
place for recreation and disposal. More and more people change to
the sea for their food supply directly due to fish harvesting. Up to
10% human protein was estimated to be derived from the sea.
Nevertheless, the food potential of the sea has not been realized in
part

3. WHAT DOES OCEAN PRODUCTIVITY
NEED?
 Phytoplankton require a suit of chemical, and nutrients.
 Sunlight is the ultimate sources of energy including the deep ocean.
 Temperature is one of the elements that is required for productivity.
 Soil is also required for this productivity which vary along with
going deeply in the ocean.
 Water play a vital role in ocean from salinity to nutrients
distribution.

4. MAJOR PLAYERS IN OCEAN
PRODUCTIVITY
• Cannot make
their own food,
and eat other
organism to
survive
• Using light as an
energy source to
make their own
food from inorganic
substances. i.e.
Green plants,
Bacteria
Ocean
Productivity
Photoautotrophs
Heterotrophs

5. FACTORS INFLUENCING
PRODUCTION
Light Temperature Nutrients
Soil Water

6. FACTORS INFLUENCING
PRODUCTION
Light
Because photosynthesis
requires light,
phytoplankton and other
primary producers are
restricted to the ocean's
upper layers, where light
is abundant enough to
keep the reaction going.
As depth increases, light
intensity decreases until
there reaches a depth
where photosynthesis can
no longer occur.
Temperature
Ocean temperatures
typically range from -20C to
300C (280-860 F). Surface
water in low latitude regions
tends to be the warmest,
whereas surface water at the
poles is obviously much
colder. There is little
seasonal variation in surface
temperature in tropical
areas.
Nutrients
Nitrogen and phosphorus, in
the forms of nitrate NO3
-,
nitrite NO2
2-, ammonium
NH4
+,, and phosphate PO4
3-
are the most important
nutrients for phytoplankton.
Many phytoplankton,
particularly diatoms, need
silica (SiO2) to form their
shells. Because all of these
nutrients, especially the
nitrogen compounds, are
present in very small
amounts in seawater

7. FACTORS INFLUENCING
PRODUCTION
Light Temperature Nutrients

8. FACTORS INFLUENCING
PRODUCTION
Soil
Ocean water salinity
changes depends mainly on
Evaporation and
precipitation. Changes of
temperature also change
the density of salinity of
water. Which affects seen
in the products distribution
area like polar region.
Water
Biogenic silica (14%), calcite
(48%), and aluminosilicate
dust (abyssal clay derived
from continent weathering)
make up ocean sediments (38
%). Because seawater is
undersaturated in silica, the
particles sink, causing
dissolution. The rate of
growth in the surface layer
versus the rate of dissolution
at depth determines the rate
of sediment accumulation.
Because seawater is
undersaturated in silica, the
particles sink, causing
dissolution. The rate of
growth in the surface layer
versus the rate of dissolution
at depth determines the rate
of sediment accumulation.

9. FACTORS INFLUENCING
PRODUCTION
Soil Water