seascape photography: the use of aerial remote sensing to...

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Seascape photography: use of aerial remote sensing to quantify landscape-scale patterns of eelgrass (Zostera marina) in Halifax Harbour Jeff Barrell Dept. of Oceanography Dalhousie University [email protected]

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Page 1: Seascape photography: the use of aerial remote sensing to …nswildflora.ca/wp-content/uploads/2018/05/NSWFS_seascape_barrell… · – Ansel Adams • “Landscape photography is

Seascape photography: use of aerial remote sensing to quantify

landscape-scale patterns of eelgrass (Zostera marina) in

Halifax HarbourJeff Barrell

Dept. of OceanographyDalhousie University

[email protected]

Page 2: Seascape photography: the use of aerial remote sensing to …nswildflora.ca/wp-content/uploads/2018/05/NSWFS_seascape_barrell… · – Ansel Adams • “Landscape photography is

• Eelgrass (Zostera marina): widespread in Atlantic Canada

• Rooted flowering plant• Moved from land -> sea ~100

million years ago• Both clonal & sexual reproduction• Perennial/annual forms

Source: IUCN

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Why is it important?

“Ecosystem engineer”• Primary production• Food web• Habitat• Alters currents• Sediments/erosion• Nutrient cycling• Ecosystem services

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In Nova Scotia:• Harvested along South Shore

NS for insulation, sound-deadening

• Exported to Boston: >400t/year in 1920s

• Later produced as “Seafelt” until early 1960s in Sable River, NS

• Used in Radio City Music Hall, Rockefeller Center in NYC

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Sensitivity and Threats• Decline in distribution

• Coastal development• Eutrophication, pollution• Climate change• Invasive species (e.g. green

crab)• Disease

• Management*• Ecosystem health indicator• Monitoring• Prediction• Habitat restoration

*Need to know where it occurs!

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Landscape ecology

Wedding et al. 2011

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Zostera “landscapes”• Multi-scale hierarchical spatial structure

• Landscape ecology models• Shoot < Patch < Landscape• Characterize & quantify landscape structure

• Difficulty of collecting fine-scale, broad-extent data• Direct sampling?• Remote sensing?• Remote sensing?

Shoot Patch Landscape

Page 8: Seascape photography: the use of aerial remote sensing to …nswildflora.ca/wp-content/uploads/2018/05/NSWFS_seascape_barrell… · – Ansel Adams • “Landscape photography is
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• “Landscape photography is the supreme test of the photographer – and often the supreme disappointment.” – Ansel Adams

Birds on a Beach – Ansel Adams

Page 11: Seascape photography: the use of aerial remote sensing to …nswildflora.ca/wp-content/uploads/2018/05/NSWFS_seascape_barrell… · – Ansel Adams • “Landscape photography is

• “Landscape photography is the supreme test of the photographer – and often the supreme disappointment.” – Ansel Adams

Birds on a Beach – Ansel Adams

Seascape

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Aerial photography: DalBlimp

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Case Study: Eastern Passage, NS

• McCormacks Beach• Shallow subtidal

eelgrass/mussellandscape

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Landscape:27.9% Eelgrass29 patches

25.1% Bivalve29,000 patches

47% Sediments

Barrell & Grant 2015

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Patch-level landscape metrics

Barrell & Grant 2015

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Patch-level landscape metrics

Barrell & Grant 2015

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Helium shortage = rising prices

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Helium shortage = rising prices

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Thanks!

[email protected]