Marine WP 2: Linking primary producers to top predators ...
Transcript of Marine WP 2: Linking primary producers to top predators ...
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Marine WP 2: Linking primary
producers to top predators: The role of capelin and sandeel in the
Godthåbsfjord area Peter Grønkjær (PI), Martin Blicher,
Rasmus Hedeholm, Malene Simon and Nathalie Danielsen
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Small zooplanktivorous fishes
• Small zooplanktivorous fishes are the primary mediators of energy flow from low trophic levels to top-predators in many marine systems.
• These fishes are often fast-growing, short-lived and their condition & population dynamics respond quickly to environmental change.
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Capelin & Sandeel
• In Greenlandic waters capelin is known as an important prey for a number of marine fishes, marine mammals and birds.
• In contrast, knowledge on the sandeel in Greenlandic waters is sparse, despite their privotal role in other north Atlantic ecosystems.
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Sandeel lifecycle
Van Deurs, 2009
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Aim
• To investigate how oceanographic conditions impact feeding, growth and energy accumulation in capelin and sandeel in the Fylla Bank & Godthaabsfjord area.
• To infer how changes in capelin and sandeel dynamics may influence their value as prey for higher trophic levels.
Gicacomo Nathalie
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Sampling in May, August and September
Capelin
Sandeel
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Analyses
• Age & growth - otoliths
• Diet
• Lipid content – muscle & total
• Energy density
• Stable isotope signatures
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Diet
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Zooplankton biomass strongly
influences growth of sandeel on the
Faroe Shelf
Eliasen 2012
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Increasing winter temperatures decrease nutritional value of sandeel.
Eliasen 2012
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Sandeel condition impact cod growth
Eliasen 2012
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…and kittiwake breeding success
Eliasen 2012
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Some perspectives
• Sandeel (and capelin) are sensitive indicator species for environmental change.
• Their growth and nutritional value can be used to gauge the productivity on the banks or fjords.
• The sandeel (and capelin) can be used to predict the productivity onhigher trophic levels.
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