Powdermill Biological Station Small Mammal Database
Powdermill Nature Reserve monitored small mammal populations from 1979-1999.
R Code to read the raw csv file and name all the columns.
powdermill_data <-read.csv('database.txt', header=F, skip=21,sep=",",quote='"', col.names=c("animal_id","is_new","species_code", "period", "time", "date", "quadrat", "sex", "sex_unknown", "weight", "sex_shrew", "scrotal_male", "inguinal_male", "pregnant", "open_vulva", "large_nipples"), check.names=TRUE, stringsAsFactors = FALSE)
R code for a data frame of the species names to match the codes
powdermill_species=read.table(header=TRUE, sep=',', stringsAsFactors = FALSE, text=' species_code, species_name BB,Blarina brevicauda CG,Clethrionomys gapperi DV,Didelphis virginiana GV,Glaucomys volans MF,Mustela frenata MM,Marmota monax NI,Neozapus insignis NM,Neotoma magister PL,Peromyscus leucopus PM,Peromyscus maniculatus SC,Sorex cinereus SD,Sorex dispar SF,Sorex fumeus SH,Sorex hoyi TS,Tamias striatus ')
Best practices and known issues:
Time series issues:
- Trapping in 1979 started in September, so 1979 is not a full year
- Trapping in 1999 ended in October, so 1999 is not a full year
Data collection summary:
Twice a month, 1 ha grid consisting of trapping stations arranged in a 10 x 10 grid (10 m between trapping stations) was trapped. 2 sherman live traps wereplaced at each trapping station. Data collected include species, reproductive info, weight, sex.