Impact of the 2011 Tohoku earthquake on the species diversity of rocky intertidal sessile assemblages

The impacts of large-scale disturbance events on the species diversity of rocky intertidal sessile assemblages across multiple spatial scales are not well understood. To evaluate the influence of the 2011 Tohoku Earthquake on alpha and beta diversities of rocky intertidal sessile assemblages, we censused sessile assemblages in the mid-shore zone from 2011 to 2019. The census was conducted across 22 study sites on five rocky shores along 30 km of the Sanriku Coast of Japan, which is located 150–160 km north–northwest of the earthquake epicenter. Alpha diversity was measured with three Hill numbers (H0, H1, and H2), which represent the number of equally common species that would exist in a community with the same diversity as the sampled community, with higher values of the subscript indicating more weight placed on abundant species. Beta diversity was measured with two metrics (BDtotal at two spatial scales). Values were compared between the years 2011–2019 and the pre-earthquake period ..., , , # Impact of the 2011 Tohoku Earthquake on the species diversity of rocky intertidal sessile assemblages

[https://doi.org/10.5061/dryad.vmcvdnd1r](https://doi.org/10.5061/dryad.vmcvdnd1r)

The alpha diversity and beta diversity data are available in \"alpha.csv\" and \"beta.csv\", and code used for analysis is available in \"data analysis.R\".

## Description of the data and file structure

`diversity.csv`

* \"year\": the census year
* \"h0\" is Hill number H0
* \"h0se\" is the standard error of Hill number H0
* \"h1\" is Hill number H1
* \"h1se\" is the standard error of Hill number H1
* \"h2\" is Hill number H2
* \"h2se\" is the standard error of Hill number H2
* \"bd1\" is the BD (beta diversity) total at shore scale
* \"bd1se\" is the standard error of the BD total at shore scale
* \"bd2\" is the BD total at regional scale.

`effect size.csv`

* \"year\" is the census year
* \"h0es\" is the effect size of Hill number H0
* \"h0esse\" is the standard error of the effect size of Hill numb...