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+ index.qmd: Contribute; indicators equ'n fix
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22 changes: 22 additions & 0 deletions index.qmd
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Expand Up @@ -61,3 +61,25 @@ By definition `r glossary("MBON")` is a network, so this is inclusive of and mea
- **Modeling** methods have dramatically improved over time and are ripe for fresh application. The R package `dismo` originally came came out with an [SDM vignette](https://cran.r-project.org/web/packages/dismo/vignettes/sdm.pdf) as a practical supplement to their excellent review of SDMs [@elith2009] and using the Maxent algorithm [@elith2011]. The raster package furthered that (raster[ sdm](https://rspatial.org/raster/sdm/)) and now there's [`terra` sdm](https://rspatial.org/sdm/). Alongside these developments has been a boon of cloud-computing, particularly Google Earth Engine [@gorelick2017; @camposEcologicalNicheModels2023], allowing for dense global raster processing.

- The world is quickly moving towards a future trying to conserve 30% of the oceans by 2030, so called "[**30 by 30**](https://en.wikipedia.org/wiki/30_by_30)". In the U.S., this is [America the Beautiful](https://www.noaa.gov/america-the-beautiful) initiative. We need biodiversity indicators to track progress. This push for conservation is driven by increasing impacts of **climate change**, as evidenced by marine heatwaves and shifts in population distributions.

## Contribute

We very much welcome your feedback, contributions and collaboration. Here are a few ways from least to most involved:

1. Email Ben (ben\@ecoquants.com) with any suggestions, including suggested revisions of this online book.

::: {.callout-note}
Note that you can download this entire book as:

- {{< fa file-pdf >}} Adobe Acrobat [pdf](https://marinebon.github.io/MarineSDMs/MarineSDMs.pdf) to add annotations; or

- {{< fa file-word >}} Microsoft Word [docx](https://marinebon.github.io/MarineSDMs/MarineSDMs.docx) to edit with Track Changes on.

These are available in the upper left navigation menu by clicking the download icon <i class="bi bi-download"></i>.
:::

2. Submit a [New Issue](https://github.com/marinebon/MarineSDMs/issues/new/choose) on Github.

3. Click on the "Edit this Page" in the upper right. If you have a Github account, then you can fork this repository from owner "marinebon" to your username, edit the page(s) and submit a pull request.

4. If you are a regular contributor, you can be added to the collaborators of this repository to make push changes directly (without needing a pull request).
6 changes: 3 additions & 3 deletions indicators.qmd
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Here are the classic diversity indices from the R package `vegan`:

$$
\begin{align*}
\begin{aligned}
H &= - \sum_{i=1}^S p_i \log_b p_i &\text{Shannon-Weaver} \\
D_1 &= 1 - \sum_{i=1}^S p_i^2 &\text{Simpson} \\
D_2 &= \frac{1}{\sum_{i=1}^S p_i^2} &\text{inverse Simpson} \\
\end{align*}
D_2 &= \frac{1}{\sum_{i=1}^S p_i^2} &\text{inverse Simpson}
\end{aligned}
$$

## Endemism
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