Coastal Ecosystems Response to Climate Change and Human Impact in the Asia-Pacific Region (CERCCHI Project)

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1 Coastal Ecosystems Response to Climate Change and Human Impact in the Asia-Pacific Region (CERCCHI Project) Prof. Kazuo Nadaoka Department of Mechanical and Environmental Informatics Graduate School of Information Science and Engineering Tokyo Institute of Technology

2 In this presentation Introduction Threats to the coastal ecosystem State of the coastal ecosystems & environment in East Asia and the Pacific Integrated Coastal Zone Management The CERCCHI Project

3 Importance of the Coastal Zone World's most important and intensely used of all areas settled by humans. An estimated 50 to 70 percent of the world's population lives in coastal zones. Given the definition of 200 meters of the sea level", the coastal domain occupies 18% of the surface of the globe; is where abut 25% of global primary productivity occurs; supplies approximately 90% of world fish catch; is where 90% of the global sedimentary mineralization occurs; accounts for 75 to 90% of the global sink of suspended river load and its associated elements or pollutants; accounts for 80% of the global organic matter burial; accounts for over 50% of present day global carbonate deposition.

4 Threats to Coastal Ecosystems Erosion & siltation Mangrove deforestation Seagrass decline due to climate change and pollution Gleaning Natural grazing Natural calamities Reef exploitation Eutrophication Over-fishing threatens 64% 64% of of the the reefs, destructive fishing, 56%, 56%, coastal development, 25% 25% & agriculture & deforestation, 20% 20% Predator Predator plagues plagues like like crown-of crown-of-thorns of-thorns starfish starfish (COTS) (COTS) may may be be initiated initiated and and certainly certainly exacerbated exacerbated by by either either over-fishing over-fishing of of key key starfish starfish predators; predators; and/or and/or increases increases in in nutrient nutrient runoff runoff from from the the land land favors favors the the planktonic planktonic stages stages of of the the starfish. starfish. (Goldberg (Goldberg and and Wilkinson, Wilkinson, 2004) 2004)

5 Threats to Coastal Ecosystems Coral Bleaching Occurrence & severity of coral bleaching (Source: Legend: No bleaching Severity unknown Low bleaching Medium High A growing body of of evidence links links severe coral bleaching and and mortality to to increasing rates of of global climate change attributed to to rising levels of of anthropogenic greenhouse emissions (Goldberg and and Wilkinson, 2004). Global warming & Climate change

6 Climate change effects on seagrass Seawater warming Seawater warming Increased CO 2 submarine submarine erosion erosion Sea level rise Sea level rise photo- synthesis reduced calcification reproduction reproduction habitat habitat expansion expansion new new habitat habitat increased increased respiration respiration Forecasted effects of climate change on seagrass (Modified from Duarte 2002 by Fortes)

7 Coastal Ecosystems in East Asia & the Pacific World s center of biodiversity globally significant for their biodiversity e.g. 30% of the world s s coral reefs (Wilkinson 2002), 33% of the world s s mangroves (Spalding et al. 1997), at least 10% of the world s seagrasses (Green & Short 2003).

8 State of the Coastal Ecosystem Present Coastal ecosystems are severely damaged: over 80% of the reefs are at great risk; mangroves have lost 70% of their cover in the last 70 years; seagrass bed loss ranges from 20-60% in the last 50 years Level of Overall Threat to Coral Reefs High Medium Low Level of Overall Anthropogenic Impacts On Coral Reefs High Medium Low None Future?? Unless managed, the reefs will collapse within 20 years, all mangroves will be lost by 2030, & seagrass beds will follow suit, so will the resources & revenues derived from them (PEMSEA 2003) What must be done to avoid such a bleak future?

9 Integrated Coastal Ecosystem Management Enable Enable understanding understanding of interrelationships interrelationships across across systems systems Link Link science science and and decision-making decision making (multidisciplinary (multidisciplinary approach) approach) Focus on water quality per se Focus on water quality per se Integrated Coastal Ecosystem Management Focus on conservation Consider Consider complex complex interactions interactions in managing managing coastal coastal resources resources

10 The CERCCHI Project Coastal Zone Management must consider complex interactions between social, economic, environmental systems must be responsive to local needs and in agreement with global efforts Present investigative efforts narrow with results incompatible for understanding of interrelationships across systems Scope Spatial and temporal aspects of change in natural and human systems in the tropical zone Measurement of dynamic parameters: : CNP fluxes, sedimentation, sediment chemistry, tide level & wave action Remote sensing data analysis as a rapid, comparable and readily available source of spatial records

11 Integrated Coastal Zone Management Underscores the need for improved assessment, monitoring and modelling of pollution and its effects on the coastal ecosystem A Large Marine Ecosystems (LMES) Strategy for the Assessment and Management of International Coastal Waters o A global effort under way o World Conservation Union (IUCN), UNESCO (IOC), other UN agencies, and the US NOAA o To improve the long-term sustainability of resources and environments of the world's LMES and linked watersheds. Five Module LME Approach

12 Linkages between tropical ecosystems Hydrologic Systems Rivers Groundwater Plains Mountains and Hills Impacts Science Terrestrial + ecosystems Integrated Human subsystem Manage- Habitation ment Activities Drivers Climate Change Hydrodynamic Systems Reefs Bays Estuaries Goods and Services Responses Marine ecosystems Corals Mangroves Seagrasses Environmental Nutrients (C,N&P) loads Sediments Chemicals?? Effects of climate change Impacts

13 The Project Approach Assistance for policy Global Change formulation Research Programs Global Coral Reef Logistical support Monitoring Network (GCRMN) Data collection Implementation of global/regional monitoring programs Data Collection Remote Sensing Geographic Information Systems Integrated Simulation Modelling Field techniques The Project Coastal Ecosystem Stakeholders Government (national and local) Non-governmental organizations (NGOs) Community-based organizations Provision of models, training, technical assistance Needs identification Data and Information Assistance in monitoring work Sharing Multidisciplinary collaboration Integrated watershed-coastal ecosystem approach Extraction of products Improved protection through monitoring and impact assessment Policy formulations, coordination and implementation of programs

14 Project Objectives Produce an accurate set of multidate coastal resource information particular to needs of managing Provide an changes in the coastal zone and understanding of the consistent to allow comparison driving/forcing effects of Assess human among systems in the region. socio -economically - welfare impacts of induced changes on changes in coastal environmental loads to Achieve and apply resource systems in the tropical coastal understanding of the terms of social costs ecosystems causes and consequences and benefits considering different of present and future management environmental change of strategies tropical ecosystems in Develop capacity building management decisions Strengthen the network through workshops on of, and reinforce standardized methods of linkages among coastal processing in-situ, remotely- scientists and managers sensed data and environment- thru shared expertise related socio-economic surveys and resources

15 Project Implementation Capacity-building (joint workshops; decision support tools suited for local management) Development of a policy-relevant prognostic model (environmental quality indicators and optimization technique to valuate resources and social priorities) Assessment and analysis of changes (changes in human and natural ecosystems considering hydrologic and hydrodynamic processes by use of physical and ecological models) Analysis of multi-temporal temporal satellite images (to detect changes in land use patterns and coastal habitats) Collection and assessment of existing studies and relevant data (changes in the coastal and human impacts in tropical marine ecosystems; identify information gaps) Data and information sharing and dissemination (data, information and knowledge base exchange among collaborators and the public) Fundamentals of the Project Appoach

16 Remote Sensing for Coastal Environments Plants and other vegetation People Sensor Further scattering at attenuation at atmosphere Sediment and nutrient (C, N, P and trace metals) Path radiance Specular reflectance Scattering at edge of atmosphere Attenuation due to scattering and absorption in atmosphere Basis of remote sensing for coastal environments: Coral reefs Mangrove forest Seagrass beds Mangroves Irradiance Further attenuation due to scattering and absorption in water Radiance Seagrasses Coral reef Development of seagrass assessment & monitoring methodology using remote sensing

17 Expected Outcomes and Outputs Impacts of changes to coastal ecosystems in East Asia and the Pacific region as depicted in processed multi-temporal temporal images Standardized in-situ data collection protocol, uniform methods for processing remotely-sensed data and socioeconomic surveys An integrated physical and ecological model specific to assessment of environmental changes in tropical ecosystems A science-based, user-driven practical decision support system (DSS) suited for management concerns in coastal zone A group of coastal scientists in the region proficient in environmental change evaluation methods Managers trained in using DSS for tropical coastal environment Documentation and other relevant publications for promoting provisional and actual use of the integrated model

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