n ramaiah - indian national centre for ocean information ... · n ramaiah csir- national ... five...
TRANSCRIPT
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N Ramaiah CSIR- National Institute of Oceanography
Dona Paula, Goa-INDIA Email: [email protected]
CSIR-National Institute of Oceanography
Dona Paula, Goa
2015.05.22
NIO-INCOIS ITCO, Hyderabad
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Climate Weather
Describes the average conditions expected at a
specific place at a given time. A region's climate
is generated by the climate system, which has
five components: atmosphere, hydrosphere,
cryosphere, land surface, and biosphere.
Describes the atmospheric conditions at a specific
place at a specific point in time. Weather
generally refers to day-to-day temperature and
precipitation activity
Climate may include precipitation,
temperature, humidity, sunshine, wind
velocity, phenomena such as fog, frost, and hail
storms over a long period of time.
Weather includes sunshine, rain, cloud cover,
winds, hail, snow, sleet, freezing rain, flooding,
blizzards, ice storms, thunderstorms, steady rains
from a cold front or warm front, excessive heat,
heat waves and more
Climatology Meteorology
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• Amount of energy spent daily by humans and other
animals at rest
• With every 1 C rise in temp, a 10% rise in BMR
Basal Metabolic Rate
BMR Energy Expenditure
Liver 27%
Brain 19%
Other Organs 19%
Skeletal Muscle 18%
Kidneys 10%
Heart 07%
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Do We Wish Such Realities/Sights?
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Natural Wealth
Man made
wealth
Minerals
Metals
Coal &
Lignite
Oil & Gas
Sunlight
Wind
Ocean
Forest
Rivers
Mountains
Grasslands
Wetlands
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GDP
Population
GDP of nations
Motor Vehicle
Paper production
Military Spending
Ozone Depletion
Water use
Loss of Rain Forest
Marine Harvest
Species Extinction
CO2 level
Temperature
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1800 - 100 Crores
1930 - 200 Crores
1960 - 300 Crores
1987 - 500 Crores
1999 - 600 Crores
2010 - 700 Crores
1800 1900 2000
Hockey Sticky?
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1800 - 100 Cr
1930 - 200 Cr
1960 - 300 Cr
1987 - 500 Cr
1999 - 600 Cr
2010 - 700 Cr
1800 1900 2000
Hockey Stick –like??
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Rushing towards un-sustainability
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CO2
Photosynthesis: CO2 +H2O light (CH2O)n+O2
Respiration: (CH2O)n+O2 Metabolism CO2 +H2O
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Marine Food-chain and Food-web
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How does changing climate affect biota in marine
environs that cover 71% of the Earth’s surface?
Oceans have a major role in the global carbon cycle
Directly impact the pace, extent of climate change
Ocean biota have huge socioeconomic value
Through marine food production
Recreation industry
Nutrient recycling
Atmospheric gas regulation
Climate impacts on ocean biota are of widespread economic implications
Estimated global income from oceans : US$ 30 trillion y−1
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Global warming will reduce
ocean productivity, marine life -Michael Behrenfeld et al Nature June 2007
• A 10-year, satellite-based analysis has shown for the first time that primary biological
productivity in the oceans is tightly linked to climate change, and would be
reduced by global warming
• On a global scale, a warmer climate could cause a rapid, overall reduction in marine
life. “…increased temperatures cause decreased marine phytoplankton
production.”
• This climate response can be traced to increased stratification in the oceans. When
the ocean surface warms, it essentially becomes “lighter” than the cold, dense water below loaded with nutrients. This process effectively separates
phytoplankton in the surface layer - which need light for photosynthesis - from
the nutrients below them, which also they need for growth
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Oceans 2000-2100 :
Expected physico-chemical changes
• Surface Ocean acidification
expected to intensify.
• Rising temperatures will impact
surface ocean stratification, which in
turn will affect the surface water
light regime and nutrient input from
deeper layers.
• Phytoplankton will be affected by
these environmental changes in
many ways.
• All these altering the complex
balance of biogeochemical cycles
and climate feedback mechanisms. (after Rost et al., 2008)
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• Near-surface waters (red) flow towards DWFR
• Main deepwater formation regions (DWFR yellow ovals)
in northern Atlantic, Ross Sea, and Weddell Sea
• Deep currents shown in blue, bottom currents in purple
• Green shading > 36 PSU blue shading <34PSU
Global thermohaline circulation
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• Continued upwelling of deep water with pre-industrial CO2 conc will enable ocean as a imp sink
• But if THC slows down, transfer of C02 rich cold water to deeper ocean would reduce
• On the other hand, for the past 20y ocean has been absorbing ~2 Gt C per year
• If C emissions are stabilized, the ocean could continue to absorb an increasing amount of CO2
from atm for up to 50 years
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…upwelling zone would be the worst affected
With alterations to THC….
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Entire Trophodynamics would be ‘adversed’
If THC is affected….
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Biological Carbon Pump
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Timing of Biological Activity
Some seasonal biological activities are happening 15-20 days earlier than several decades ago:
– Trees blooming earlier
– Migrating birds arriving earlier
– Butterflies emerging earlier
Changes in timing differ from species to species, so ecological interactions are disrupted.
European pied flycatcher
chicks are now born later
than the caterpillars they
eat.
Images used under the terms
of the GNU Free
Documentation License.
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• Approximately half of the CO2 from burning fossil fuels and cement production in the past
200 years has already been absorbed by the oceans
• This CO2 absorption already led to decrease in ocean pH by ~ 0.1 unit from pre industrial levels
• This change represents about a 30% increase in the concentration of H+ in seawater
• Alarmingly, H+ concentration, and the rate at which it is rising, are both still increasing
What is causing ocean acidification?
CO2
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What is the Significance
of Ocean Acidification?
Bioavailability of carbonate is hampered
• Many marine organisms make shells or supporting plates
out of calcium carbonate (CaCO3) for calcification
• Calcification is inhibited; growth and/or survival of certain organisms could be affected in ‘acidic oceans’
• Many of these organisms form the primary production of oceans: any change in their life cycle has the potential to impact all marine ecosystems
• With already very low calcium carbonate saturation levels Southern Ocean identified as being particularly vulnerable
a, b, d, e, Emiliania huxleyi ; and c, f,
Gephyrocapsa oceanica collected from
cultures incubated at [CO2] ≈ 12 µ mol l -1
( a – c ) and at [CO2] ≈ 30–33 µ mol l -1 ( d
– f ), corresponding to p CO2 levels of
about 300 ppmv and 780–850 ppmv
respectively.
Note distinct malformations
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Change in Diversity as a Fn of pH Redn
For biota near the Ischia CO2 vents.
1. The biodiversity per cent of taxa that occur in areas
with no pH reduction, open square) for 51 calcifying
taxa (white circles) and 71 non-calcifying taxa (black
circles).
2. Atmospheric pCO2 levels (ppmv CO2) that would be
required to cause pH changes in ocean surface waters
equivalent to those observed at three locations along
the pH gradient at Ischia (dotted vertical lines).
3. For calcifiers (3a), non-calcifiers (3b), and all taxa
combined (3c) exponential regressions explained 99%,
90%, and 88% of the variance, respectively.
4. Fitted regressions indicate a loss of biodiversity of ∼40% for non-calcifiers and all taxa, and ∼70% for
calcifiers, for a pH reduction corresponding to the
atmospheric pCO2 level expected by 2100.
2 1
3b
3a
3c
Data from Hall-Spencer et al. (2008)
4
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Resilience and Vulnerability of Corals in Indian Reefs to
Current Climate and Environmental Scenario
Photo Courtesy: B. Manikandan; INSPIRE Fellow@NIO
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Continuous Plankton Recorder survey showing abundance of Calanus populations in the North
Sea from 1960 to 2002. Relative contribution of Calanus finmarchicus (blue) and Calanus
helgolandicus (red) is shown in relation to total Calanus abundance
(After Martin Edwards, Sir Alister Hardy Foundation for Ocean Science )
Time-series Programmes
Provide valuable information on Plankton
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Tcrit = Critical Temperature where there is an onset of
anaerobic metabolism;
Tpej = Pejus Temperature above and below which oxygen
supplies to tissues become sub-optimal;
Topt = Optimal Temperature;
Tden = Denaturation Temperature where molecules lose
integrity. (After Pörtner et al., 2005, 2010).
THP: The Deadly Trio • Optimal performance of many
organisms is affected by
temperature, ocean carbonate
chemistry and hypoxia*
• For animals, oxygen and
capacity limited thermal
tolerance (OCLTT) govern their
specialization to be inside
specific, limited temp ranges
and, their sensitivity to temp
extremes.
• Optimal OCLTT allow
integration of other stressors on
a thermal matrix of performance
*the three direct symptoms of a massive carbon perturbation
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• Highly conserved group of intracellular proteins
• Found in all living organisms from bacteria to humans
• Generally expressed at very low levels under normal
conditions, but levels increase rapidly in
response to a stress
• Heat shock proteins protect the cell by preventing
irreversible denaturation of proteins at high
temperature; therefore they are considered to
be a potential biomarker indicating responses
to climate changes
• Synthesis increases upon heat shock or exposure to
other environmental stresses.
HSP FUNCTION
HSP 70 Chaperone activity, prevent and repair misfolded proteins, protein
translocation, regulation of cell death also stimulate protein glycosylation
HSP21 Assist in protein folding along with other HSPs
HSP90 Chaperone activity, degradation of misfolded proteins , signal transduction
and cell cylce control
HEAT SHOCK PROTEINS (HSPs)
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Higher temp induces HSPs and Antioxidant enzymes
qPCR analysis of HSP genes
qPCR anlaysis of antioxidant enzymes genes 15ppt 35ppt
25˚C
15ppt 35ppt
15ppt
28˚C
30ppt
18˚C
35ppt
CTRL
35˚C
Inference:
qPCR analysis reveals up-regulation of all
the three HSP genes at higher temperatures.
Thus these genes can be potential candidate
for their application as biomarkers to assess
environmental stress.
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Antarctic Fish Pagothenia borchgrevinki
HSP produced in Antarctic organisms at low temperatures (<10°C)
HSP expression in some hyperthermophilesexpress only after 60°C
HSP expressed in mammalian hypothermic organs (testis) at lower temperatures than in normothermic organs
HSP Induction Corresponds to Temperatures
Stressful for a Given Species or Cell Type
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Complex Interaction of Variables Affects Health
SHRIMP
HEALTH
Host
Genetics
Species
life stages
Physiology
Immunity
Nutrition
Quality and quantity
Husbandry
Density Handling
Environment
Organic load , Temp, S, O2,
NH3, CO2, H2S, NO2
Pathogen
Species
Type
• Defining what levels of stressors are normal and acceptable is not easy.
• Stressors present in combinations might be benign by themselves but pose a far greater
threat because they are present together
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10-15 Viruses, 5-6 Bacteria, 3-4 Fungi are Major Microbial Enemies of Shrimps
Bacteria: Vibrio (harveyi; alginolyticus, vulnificus); Pseudomonas,Clostridium spp
Fungi: Lagenedium, Sirolpedium, Saprolegnia
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• Are marine animals in coastal waters acquiring pathogens contaminated
by human, agricultural, and medical waste?
• Can marine life act as carriers for infectious diseases, spreading
pathogens through the oceans?
• Can marine animals ingesting antibiotics in medical waste, serve as
incubators to maintain, multiply, and spread antibiotic-resistance
genes through marine and coastal ecosystems?
Sea Life is Accumulating Pathogens A wide range of marine animals also contains microbes that are resistant to antibiotics
"One porpoise showed resistance to 15 out of 20 antibiotics we tested for,” Bogomolni said. “One of the antibiotics we screened for was gentamicin, which is an agricultural antibiotic. It was
ridiculous just looking down the list (of antibiotics) and seeing, ‘Resistant, resistant, and resistant.’ Porpoise are coastal animals, so maybe they are picking (antibiotics or resistant bacteria) up along their migration.”
Marine animal fecal samples are important in revealing bacteria and parasites.
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DOC
DOC
CO2
Triggers :oxygen, temperature, stratification, circulation, radiation
• Ocean DOC pool is of comparable size of atmospheric CO2 inventory
• Exchanges between these two pools are natural (A), continuous, long-term
• Global warming (B) or cooling (C ) is triggered by imbalanced exchange
Ocean Role in Climate Change
A
CO2
B
DOC
CO2
We
All W
an
t Th
is!
C
OC
EAN
A
TM
OSPH
ERE
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CC Impacts Us All. Severally, Severely
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www.wikipedia.org/wiki/Global_warming
Global Climate Change:
What we’re doing now is more destructive than then • Global warming is when the temperatures get abnormally higher and higher.
• Global Climate Change is getting worse every year.
• The IPCC conclude that most of the temperature increases since the 20th century
was probably caused by the increases of greenhouse gases from things such as
fossil fuel burning and deforestation.
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• Future Oceans : Temperature changes , Hypoxia , Acidification
• Understanding Biodiversity
• Biodiversity effects on the functioning of marine ecosystems
• Biological invasions
• Natural Resources : overexploitation, fisheries and aquaculture
• Ocean noise pollution
• Habitat loss, Urban Development
• Coastal infrastructures and Marine Spatial Planning
Biological Oceanography:
Fisheries Professionals Forte
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Do We Wish For Such Sights?
Mass death of cultured fish due to toxic phytoplankton blooms
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Earth’s Life Very Beautiful
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If we don’t help save our Earth’s Life ………
…… it will be made to LURCH & disappear!!!
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Thank You
Plea of a Marine Microbe: