Processing math: 100%

Introduction

The Ocean Health Index (Halpern et al., 2012; Selig et al., 2013) derives most of its pressures from Halpern et al. (2008)

0.1 Food Provision: Fisheries

Amount of sustainable wild-caught seafood compared to the max sustainable

xFIS=(6g=1SSCi,gi,g)1Ci,g

Variables:

0.2 Results

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).

Top 10 scoring regions.
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.

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.

0.3 Github Markdown

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.

References

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