海洋英语PPT

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Harmful algal bloom
impact cause research
solution
prevention method
two aspects
Adopting long-term prvention strategy The establishment and development of emergency management technology
prevention method
Adopting long-term prvention strategy Strengthen the Reduce the spre- Control the use management of ad of harmful al- of chemical human activities gal bloom effects fertilizer
temperature Marine pollution
air temperature Other human factors
cause
three points
Firstly， water eutrophication is
material base and primary condition of red tides occur.
cause
three points
Secondly， hydrometeorological
and the change of physical and chemical factors of sea water is the important reason for the red tides occur.
Ocean university of china
Harmful algal bloom
Thirteenth group
Ocean university of china
PART 1
Harmful algal bloom
impact cause research
PART 2
PART 3
PART 4
Changes in the harmful algal bloom season appear to be imminent.
Fresh water Harmful Algal Blooms: Toxins and Children's Health
Decaying algae release noxious odors and reduce dissolved oxy -gen levels resulting in fish dieoffs and a loss of biodiversity. Frequent low level exposures a -re associated with chronic illn –esses such as liver cancer.
water eutrophication
Eutrophication is one of the water body aging phenom-
enon .It can increase water
sediment and the number of nutrient element.
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prevention method
Adopting long-term prvention strategy Strengthen the Reduce the sp-readControl the use management of of harmful algal of chemical human activities bloom effects fertilizer
Marine pollution
Chemical factors
Marine pollution Excessive aquaculture
cause
three points
Finally,Pollution of mariculture itself is one of the inducing factors .
prevention method
Adopting long-term prvention strategy Strengthen the Reduce the spre- Control the use management of ad of harmful al- of chemical human activities gal bloom effects fertilizer
Pollution of mariculture
For the surplus food is not directly into the farmed fish eat . It can cause water pollution.
In addition to the above two kinds of main factors, red tide disasters and biological factors also have relationship; Area location, topography and
impact
What is HABs？
Different colors Specific area Toxins and accumulated biomass
The sea Specific area , toxins and accumulated biomass, Ciguatoxin anemone toxin
Toxins accumulation
Shellfish death
shrimp death
HABs Harm
fish death
bird death
game over
Thank you
Harmful algal bloom
impact cause research
solution
Leabharlann Baidu
cause
different colors, trouble maker
Streptomyces
Plant toxin
impact
What is the impact？
Impact on ecosystems
Impact on wildlife Impact on human health
Impact on socioeconomy
Large area
Water discolor
Fish death
impact
What is HABs？
Different colors
green
brown
Types of the phytoplankton
red colorless
impact
What is HABs？
Different colors Specific area
The classification of red tide
Red tide Biological factors Physical factors salinity Seafood farming Chemical factors Human factors Biological spread Terrain factors Meteorologic al factors precipitation
Thank you
Harmful algal bloom
impact cause research
solution
U.S. study predicts prolonged toxic algal outbreaks due to climate change
If consumed by humans, saxitoxin can cause gastrointestinal and neurological symptoms including vomiting and muscle paralysis or even death in extreme cases,
solution
Harmful algal bloom
impact cause
research
solution
impact
HABs Event
Time：December 25,2014 Site：dameisha,Shenzhen event：harmful algal bloom
Time：December 25,2014 Site：dameisha,Shenzhen event：harmful algal bloom
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prevention method
The establishment of emergency management technology
biological method physical method
Management technology
chemical method
physical method
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prevention method
Adopting long-term prvention strategy Reduce the spread Control the use Strengthen the management of of harmful algal of chemical bloom effects human activities fertilizer
physical method:clay
mechanism
•Flocculation
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advantage
•harmlessness •resourceful
•easy operating
chemical method
chemical method:CuSO4
mechanism advantage disadvantage •breaking cells and inhibition of biologicai activity •immediate effect
Physical factors
The temperature of the sea water
Physical factors
The temperature of the sea water The salinity of the Ocean
Chemical factors
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•expensive •poor effect •secondary pollution
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biological method
biological method:fish and microorganism
mechanism advantage •food chain
•high efficiency •high selectivity •environment friendly
other factors is also the cause of red tide occurrence; The occurrence of
red tide disaster is also related to meteorological conditions, mainly the temperature and precipitation conditions.