The Ocean Health Index (Halpern et al., 2012; Selig et al., 2013) derives most of its pressures from Halpern et al. (2008)…
Amount of sustainable wild-caught seafood compared to the max sustainable
xFIS=(6∏g=1SSCi,gi,g)1∑Ci,g
Variables:
Hats off to the top scoring region of Heard and McDonald Islands with a score of 90.29! The top 10 scoring regions (of 221 globally) are largely comprised of unpopulated islands (see Table 1).
Region | Score |
---|---|
Heard and McDonald Islands | 90.29 |
Ile Europa | 89.48 |
Bassas da India | 88.17 |
Howland Island and Baker Island | 85.89 |
Juan de Nova Island | 83.84 |
Glorioso Islands | 83.79 |
Kerguelen Islands | 82.84 |
Northern Saint-Martin | 82.58 |
Nauru | 82.18 |
Seychelles | 81.93 |
The global average of 68 consists of food provision scores being lowest (Mariculture = 26; Fisheries = 40), but Artisanal Fishing Opportunities highest (98) (see Figure 1).
Global average across Oceean Health Index goals.
Note that the echo = FALSE
parameter was added to the code chunk to prevent printing of the R code that generated the plot.
To get github friendly Markdown document for cleanly tracking changes to document in Github, put the following output first:
output:
md_document:
variant: "markdown_github"
NOTE: You need to run this LAST though, since knitting other formats wipes out the test_files
directory. To return to the Knit button having other options (HTML, PDF, Word), move this output type below the first option.
Halpern, B. S., Longo, C., Hardy, D., McLeod, K. L., Samhouri, J. F., Katona, S. K., … Zeller, D. (2012). An index to assess the health and benefits of the global ocean. Nature. doi:10.1038/nature11397
Halpern, B. S., Walbridge, S., Selkoe, K. A., Kappel, C. V., Micheli, F., D’Agrosa, C., … Watson, R. (2008). A Global Map of Human Impact on Marine Ecosystems. Science, 319(5865), 948–952. doi:10.1126/science.1149345
Selig, E. R., Longo, C., Halpern, B. S., Best, B. D., Hardy, D., Elfes, C. T., … Katona, S. K. (2013). Assessing Global Marine Biodiversity Status within a Coupled Socio-Ecological Perspective. PLoS ONE, 8(4), e60284. doi:10.1371/journal.pone.0060284