Ecological dynamics of a salmon parasite

Mark Lewis (April 10, 2014)

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Slides

0:00 Ecological dynamics of a salmon parasite
1:18 Domestic animals: Novel reservoirs
2:26 Understanding disease emergence
2:44 Fish population structure and transmission
3:58 Salmon farms, 2000
4:18 Photo: Alexandra Morton
4:47 Historical Context
6:00 Outline (1)
6:44 Outline (2)
6:53 Outline (3)
7:07 Outline (4)
7:18 Outline (5)
8:20 Outline (6)
9:31 Salmon farms
9:46 Photo: Marttin Krkosek
9:50 Outline (7)
10:02 Lice on wild and farmed fish
10:44 Outline (8)
10:49 Fieldwork – 2003
11:21 Data - First Glance
12:34 Results
13:27 Origins of lice
14:02 Outline (9)
14:15 Mortality Experiments "Camp Sea Lice"
14:28 Mortality Experiments - Multiple farms
15:25 Predictions for spatial survival
16:50 Pink Salmon
17:52 Chum Salmon
18:02 Comic about Fish Farming
18:10 Outline (10)
18:31 Testing population level impacts
18:33 Testing population level impacts (2)
18:42 Testing for Population Impacts - Pink Salmon
19:46 Testing for Population Impacts - Pink Salmon (2)
20:30 Results - Pink Salmon
21:48 Pathogenicity and mortality - Pink Salmon
21:52 Testing for Population Impacts - Chum Salmon
23:22 Outline (11)
23:24 Predator mediated mortality?
23:30 Lice alter behaviour
24:07 Lice alter predation risk
24:34 Parasite mediated predation
25:22 Do predators increase mortality or provide an ecosystem service?
26:07 Predator preference dynamics
26:38 Predator preference dynamics (2)
26:47 Predator preference dynamics (3)
27:23 Conclusion
28:01 Role of science in policy

Abstract

In this talk I will outline the impact that parasitic sea lice have on the ecology of pacific salmon and the role that parasite spill over and spill back with aquaculture has taken in modifying the ecology of pacific salmon. These modifications are far reaching, and include changes in salmon returns, establishment of nonlinear population thresholds such as Allee effects, and shifts in predator prey dynamics. My talk will involve a mixture of modelling and data, based on over a decade of intensive field work.