Monitoring Global Change in Temperate Reef Communities Larry Deysher – Ocean Imaging Matt Edwards...
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Transcript of Monitoring Global Change in Temperate Reef Communities Larry Deysher – Ocean Imaging Matt Edwards...
Monitoring Global Change in Monitoring Global Change in Temperate Reef CommunitiesTemperate Reef Communities
• Larry Deysher – Ocean Imaging• Matt Edwards – San Diego State University• Jon Dykstra – Earth Satellite Corporation• Paul Dayton – Scripps Institution of Oceanography
Project ObjectivesProject Objectives
• Cost-effective method of mapping kelp canopies on a global basis
• Baseline for global kelp distributions (Year 2000)• Model linking kelp distributions with physical
factors such as temperature & wave heights• Discriminate localized kelp bed changes from
climate related effects
Kelp Habitat StructureKelp Habitat Structure
Half–life 2 to 4 years Half–life 10’s to 100’s years
Photos: Mark Carr & Bill Bushing
Canopy Area (ha)
Bed DMSC ETM+
Harvest 4.9 8.0
Control 1 0.5 0.9
Control 2 2.3 3.4
Control 3 9.0 11.1
Range BoundariesRange Boundaries• Baja California• Peru / Chile & Argentina• Namibia / South Africa• Australia – Tasmanian
population declines• Subantarctic Islands
– Kerguelen Island– Heard Island– South Georgia Island
Peru / Chile / Argentina
Northern Boundaries
Peru – 13.8o SPeru Coastal Current (Humboldt)
Argentina – 42.0o SBrazil-Malvinas Confluence
Namibia / South Africa
Northern Boundary – 21.5o SBenguela Current
Eastern Boundary – 19.6o E Agulhas Current
Subantarctic Subantarctic IslandsIslands
Kelp on islands north of Antarctic Convergence
with the exception of South Georgia Island
SST - Kerguelen & HeardSST - Kerguelen & HeardApril 1998 October 1998
Heard Heard
Kerguelen Kerguelen
SST Anomaly - Kerguelen & HeardSST Anomaly - Kerguelen & HeardApril 1998 October 1998
Heard Heard
Kerguelen Kerguelen
Coastal Water ClarityCoastal Water Clarity
Turbidity plumesPlankton blooms
MODIS Satellite imagery Spatial Resolution 250 m (bands 1 - 2) 500 m (bands 3 - 7) 1000 m (bands 8 - 36)