Effects of disturbance on genetic diversity in the submersed aquatic plant Vallisneria americana

In summer 2011, Tropical storms Lee and Irene caused an estimated 90% decline of the submersed aquatic plant Vallisneria americana Michx. (Hydrocharitaceae) in the Hudson River, of New York (USA). To understand the genetic impact of such large-scale demographic losses, we compared diversity at 10 microsatellite loci in 135 samples collected from 5 sites just before the storms with 239 shoots collected from 9 sites four years after. Although 80% of beds sampled in 2011 lacked V. americana in 2015, we found similar genotypic and genetic diversity and effective population sizes in pre-storm versus post-storm sites. These similarities suggest that despite local extirpations concentrated at the upstream end of the sampling area, V. americana was regionally resistant to genetic losses. Similar geographically based structure among sites in both sampling periods suggested that cryptic local refugia at previously occupied sites facilitated re-expansion after the storms. However, this apparent re..., Leaves were collected in the field and DNA was extracted.  Microsatellites were amplified using PCR and deteced on an Applied Biosystems Incoroporated 3730 DNA sequencer.  Microsatellite alleles were called using GeneMapper and checked manually for accuracy.  Multilocus genotypes were identified using the program Genodive and the poppr package in the R statistical environment as described in the publication., One file is a csv file that can be opened by any text editor and most other programs. One file is an .xlsx file that requires Excel to open it., # Effects of Disturbance on Genetic Diversity in the Submersed Aquatic Plant Vallisneria americana.---

These data represent genotypes of Vallisneria americana individuals from the Hudson River, New York, USA collected in 2011, 2014, and 2015. These data were analyzed to understand the impact of two major floods on the genetic diversity of V. americana in the river.

## Description of the data and file structure

hudbase.CATS.2011.2014.2015.csv
The csv file hudbased.CATS.2011.2014.2015.csv includes the
IDName � the identifier code for the sample
NewPop � the code for the sampling location
OrderPop � a numeric code for sites with higher values downstream. It is used to order sites when plotting.
Full.Population.Name � the full name of the sampling location.
Year. Collected � the year the sample was collected from the field.
Clone.ID.2018 � the identifier code for the multilocus genotype of each sample.
Longitude and Latitude � sampling coordinates.
X and Y � the UTM coordinate eastings a...