Island Food Web Study - Central Coast Islands (100 Islands Project) - April to July 2015, 2016, & 2017

This dataset contains raw stable isotope data for various taxa, and cleaned data used for analysis in Obrist et al. (2021), Biogeographic features mediate marine subsidies to terrestrial food webs. It also includes meta-data for all datafiles. In this study, we have evaluated the enrichment of soil, plants, invertebrates, and songbirds using δ15N and δ13C stable isotopes, as well as a measure of available nitrogen (%N) on 97 islands. We determined the effects of island size, wrack biomass, island slope, and distance to shore at which the sample was collected. The first data file, named “food-webs-ibt-2021.csv”, runs with the ibt-percent-n.RMD, ibt-d13c.RMD, and ibt-d15n.RMD scripts. It includes δ15N, δ13C, %N, and %C values of soil, salal (Gaultheria shallon), false lily-of-the-valley (Maiathemum dilatatum), herbivorous weevils (Curculionidae), detritivorous isopods (Isopoda), carnivorous ground-dwelling beetles (Coleoptera), as well as songbird feces and feather (rectrix) samples. Data files named “ibt-sem-data-2021.csv” and “ibt-sem-data-2021-plants-combined.csv” run with the ibt-sem.RMD script. In this script, we outline decisions made in fitting structural equation models to track nutrient flow through island food webs. We find multicollinearity in our initial approach (using the “ibt-sem-data-2021.csv” file), and end up taking average values of δ15N and δ13C of all plant samples on each island for a single, island-wide plant δ15N and δ13C value for analysis (in “ibt-sem-data-2021-plants-combined.csv”). Obrist DS, Ernst CE, Fitzpatrick OT, Kennedy JC, Nijland W, Reshitnyk L, Wickham SB, Darimont CT, Starzomski BM, Reynolds JD. https://doi.org/10.21966/8j4j-7039 Scripts can be accessed from https://github.com/debobrist/food-web-ibt. April through July in 2015, 2016, and 2017

Access and Use

Licence: Creative Commons Attribution 4.0
Limitations: Appropriate credit must be given to Hakai Institute and the authors of the dataset.

Data and Resources

Citation

Keywords

Dataset extent

Map data © OpenStreetMap contributors

Metadata Reference Date(s) May 05, 2022 (Publication)
May 05, 2022 (Revision)
Dataset Reference Date(s) April 01, 2015 (Creation)
May 17, 2021 (Publication)
Frequency of Update As Needed

Responsible Party 1
Name
Debora S Obrist
Affiliation
Hakai Institute
Email
debora_obrist@sfu.ca
Role
  • Author
  • Originator
  • Owner
  • Point of Contact
  • Principal Investigator
  • Processor
  • Publisher
Responsible Party 2
Name
Geospatial Technology Team
Affiliation
Hakai Institute
Email
data@hakai.org
Role
  • Custodian
  • Distributor
  • Point of Contact
  • Resource Provider
  • Collaborator
Responsible Party 3
Name
C E Ernst
Affiliation
Hakai Institute
Email
data@hakai.org
Role
  • Author
  • Co Author
Responsible Party 4
Name
O. T. Fitzpatrick
Affiliation
Hakai Institute
Email
data@hakai.org
Role
  • Author
  • Co Author
Responsible Party 5
Name
J C Kennedy
Affiliation
Hakai Institute
Email
data@hakai.org
Role
  • Author
  • Co Author
Responsible Party 6
Name
W. Nijland
Affiliation
Hakai Institute
Email
data@hakai.org
Role
  • Author
  • Co Author
Responsible Party 7
Name
L. Reshitnyk
Affiliation
Hakai Institute
Email
data@hakai.org
Role
  • Author
  • Co Author
Responsible Party 8
Name
S B Wickham
Affiliation
Hakai Institute
Email
data@hakai.org
Role
  • Author
  • Co Author
Responsible Party 9
Name
C T Darimont
Affiliation
Hakai Institute
Email
data@hakai.org
Role
  • Author
  • Co Author
Responsible Party 10
Name
B M Starzomski
Affiliation
Hakai Institute
Email
data@hakai.org
Role
  • Author
  • Co Author
Responsible Party 11
Name
J D Reynolds
Affiliation
Hakai Institute
Email
data@hakai.org
Role
  • Author
  • Co Author

Field Value
Ocean Variables
  • Stable carbon isotopes
  • Other
Scope Dataset
Status On Going
Topic Category oceans
Maintenance Note Generated from https://cioos-siooc.github.io/metadata-entry-form
Spatial Extent { "coordinates": [ [ [ -128.6, 51.39 ], [ -127.6, 51.39 ], [ -127.6, 52.08 ], [ -128.6, 52.08 ], [ -128.6, 51.39 ] ] ], "type": "Polygon" }
North Bounding Latitude 52.08
South Bounding Latitude 51.39
East Bounding Longitude -127.6
West Bounding Longitude -128.6
Temporal Extent
Begin
2015-04-01
End
2017-07-31
Vertical Extent
Min
0.0
Max
250.0
Default Locale English
Citation identifier
Code
10.21966/8j4j-7039