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Temperature-dependent effects of sea-louse infestation on juvenile Atlantic salmon

Citation

Godwin, Sean (2020), Temperature-dependent effects of sea-louse infestation on juvenile Atlantic salmon, Dryad, Dataset, https://doi.org/10.5061/dryad.2jm63xskg

Abstract

Infectious diseases are key drivers of wildlife populations and agriculture production, but whether and how climate change will influence disease impacts remains controversial. One of the critical knowledge gaps that prevents resolution of this controversy is a lack of high-quality experimental data, especially in marine systems of significant ecological and economic consequence. Here, we performed a manipulative experiment in which we tested the temperature-dependent effects on Atlantic salmon (Salmo salar) of sea lice (Lepeophtheirus salmonis) – a parasite that can depress the productivity of wild-salmon populations and the profits of the salmon-farming industry. We explored sea-louse impacts on their hosts across a range of temperatures (10, 13, 16, 19, and 22 °C) and infestation levels (zero, ‘low’ (mean abundance ± SE = 1.6 ± 0.1 lice per fish), and ‘high’ infestation (6.8 ± 0.4 lice per fish)). We found that the effects of sea lice on the growth rate, condition, and survival of juvenile Atlantic salmon all worsen with increasing temperature. Our results provide a rare empirical example of how climate change may influence the impacts of marine disease in a key social-ecological system. These findings underscore the importance of considering climate-driven changes to disease impacts in wildlife conservation and agriculture. This Dryad submission includes the growth-rate, condition, and survival data for the manuscript entitled "Increasing temperatures accentuate negative fitness consequences of a marine parasite" by Sean C. Godwin, Mark D. Fast, Anna Kuparinen, Kate E. Medcalf, and Jeffrey A. Hutchings. 

Methods

See methods section of manuscript.

Usage Notes

Notes
NAs due to unmatched pit tags between start and end of experiment (i.e., no pit tag scanned at start and/or end)

Column metadata for growth-rate and condition dataset
date = date (yyyy-mm-dd)
temp.group = assigned temperature group
temp.real = observed mean temperature of temperature group over course of experiment
dd = observed number of degree-days for temperature group over course of experiment
inf = infestation level (zero, low, high)
fish.id = unique identifier for individual fish
body.wt = wet body weight in grams at end of experiment
length = fork length in centimetres at end of experiment
k = condition factor at end of experiment (see paper for calculation details)
pre.body.wt = wet body weight in grams at beginning of experiment
pre.length = fork length in centimetres at beginning of experiment
pre.k = condition factor at beginning of experiment (see paper for calculation details)
k.change = k / pre.k
growth.dd = growth rate in grams per degree day (see paper for calculation details)

Column metadata for survival dataset
temp.group = assigned temperature group
temp.real = observed mean temperature of temperature group over course of experiment
inf = infestation level (zero, low, high)
time = number of days from infestation to event
censor = dissection (1) or mortality (2)

Funding

Liber Ero

Natural Sciences and Engineering Research Council of Canada, Award: 04249-2015,170146-2013

Academy of Finland

European Research Council, Award: COMPLEX-FISH 770884

Atlantic Salmon Conservation Foundation

Atlantic Canada Opportunities Agency in association with the Atlantic Innovation Fund

Ocean Frontiers Institute