Supplement 1. Data used to estimate mortality rates of winter skate in the southern Gulf of St. Lawrence and on the eastern Scotian Shelf.
Douglas P. Swain
Ian D. Jonsen
James E. Simon
Ransom A. Myers
10.6084/m9.figshare.3514397.v1
https://wiley.figshare.com/articles/dataset/Supplement_1_Data_used_to_estimate_mortality_rates_of_winter_skate_in_the_southern_Gulf_of_St_Lawrence_and_on_the_eastern_Scotian_Shelf_/3514397
<h2>File List</h2><blockquote>
<p><a href="EasternScotianShelf_WinterSkate_Zdata.csv">EasternScotianShelf_WinterSkate_Zdata.csv</a></p>
<p><a href="SouthernGulfStLawrence_WinterSkate_Mdata.csv">SouthernGulfStLawrence_WinterSkate_Mdata.csv</a></p>
</blockquote><h2>Description</h2><blockquote>
<p>EasternScotianShelf_WinterSkate_Zdata.csv contains time series of relative abundance for winter skate on the eastern Scotian Shelf. These abundance indices are based on catch
rates in an annual bottom-trawl survey adjusted for size-selectivity as
described in <a href="appendix-B.htm">Appendix B</a>. These data were inputs to models used to estimate total mortality rates (<i>Z</i>) of winter skate on the eastern Scotian Shelf (e.g., model 1 in <a href="appendix-D.htm">Appendix D</a>). Juv1 is the abundance index for juvenile stage 1, defined as skates 36 – 59 cm in total length (TL). Juv2 is the abundance index for juvenile stage 2 (60 – 74 cm TL). Adult is the abundance index for adult skates (TL 75 cm or more). Checksum values are: Juv1 141.1812435, Juv2 42.48867236, Adult 61.60407165.</p>
<p>SouthernGulfStLawrence_WinterSkate_Mdata.csv contains abundance indices and estimates of discarded catch for winter skate in
the southern Gulf of St. Lawrence as well as potential covariates of natural mortality for this population. The abundance indices are
based on catch rates in an annual bottom-trawl survey adjusted for catchability and availability as described in <a href="appendix-B.htm">Appendix B</a>.
These data were inputs to models used to estimate natural mortality rates (<i>M</i>) of winter skate in the southern Gulf of St. Lawrence (e.g., model 2 in <a href="appendix-D.htm">Appendix D</a>). Descriptions and checksum values for the columns are:</p>
<p>juv.absD: the abundance index for juvenile skate (TL 21 – 41 cm), scaled to estimated
absolute abundance (millions) at daytime catchability (checksum: 112.0066529).</p>
<p>ad.absD: the abundance index
for adult skate (TL 42 cm or more), scaled to estimated absolute abundance
(millions) at daytime catchability (checksum: 82.28637812).</p>
<p>juv.disc:
discarded catch (millions) of juvenile skate (checksum: 3.873395661).</p>
<p>ad.disc:
discarded catch (millions) of adult skate (checksum: 12.64364398).</p>
<p>seals:
estimated total abundance of grey seals in the
Gulf of St. Lawrence
herd (checksum: 1048800).</p>
<p>lcod:
an index of the relative abundance of large cod (TL 60 cm or more) in the
southern
Gulf
of St. Lawrence, based on mean
catch rates in the annual bottom-trawl survey (checksum: 225.637674).</p>
<p>intemp:
an index of the mean temperature in September in shallow inshore waters of the
southern
Gulf of St. Lawrence
(checksum: 444.01)</p>
</blockquote>
2016-08-04 11:03:35
recovery potential
Bayesian analysis
fishing mortality
Leucoraja ocellata
state–space models
natural mortality
stage-structured population models
species at risk
winter skate
Environmental Science
Ecology