Graham S. Goulette1. , James P. Hawkes1, Michael B. O’Malley1, Paul M

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Presentation transcript:

Estuarine and community emigration ecology of Atlantic salmon in the Penobscot Estuary, Maine Graham S. Goulette1*, James P. Hawkes1, Michael B. O’Malley1, Paul M. Music1, Justin R. Stevens1, Daniel S. Stich2 and Christine A. Lipsky1 1 NOAA’s National Marine Fisheries Service, Northeast Fisheries Science Center, 17 Godfrey Drive Suite 1, Orono, ME 04473 U.S.A. 2 Department of Wildlife Ecology, 5755 Nutting Hall, University of Maine, Orono, ME 04469 U.S.A.

Introduction Historically low Atlantic salmon abundance Smolt survival and behavior in the Penobscot Estuary Identifying areas of high loss – what is predator suite Estuarine community – potential for prey buffer

Approach Emigration dynamics Survival estimates Areas of loss Telemetry Emigration dynamics Survival estimates Areas of loss Potential Predators Avian and marine mammal surveys Abundance and behavior Estuary sampling Species composition Relative abundance Size distribution Hydro-acoustic surveys Fish Biomass Temporal and spatial distribution

Study area Release Site Outer Arrays

Survival Seaward Progression

Emigration Dynamics Daylight Twilight Night Fish Track

Emigration Dynamics Daylight Twilight Night Fish Track

Active Searches Release Site Final resting location

Cormorant Roosting Sites Active Searches NOAA Transmitters USGS Transmitters Cormorant Roosting Sites

Survival Bottlenecks Seaward Progression

Estuary Sampling Beach Seines Fyke Nets Pelagic Trawls Hydro-acoustics Predator surveys

Size Distributions Smolts Other Species

Temporal/Spatial Distributions April 20th 2012 May 5th 2012 June 1st 2012 June 19th 2012

Baseline Abundance Smolts Other Species

Five Fold Increase Smolts Other Species

Ten Fold Increase Smolts Other Species

Moving Forward Develop multiyear telemetry study using various release times Expand hydroacoustic effort further into bay Explore existence or non-existence of prey buffer in adjacent systems

Questions?