Revision of Powdermill Biological Station Small Mammal Database from Tue, 2016-08-02 13:57
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Overview:
Powdermill Nature Reserve monitored small mammal populations from 1979-1999.
Last modified:
Supplemental resources:
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", "period", "time", "date",
"quadrat", "sex", "sex_unknown", "weight", "sex_shrew",
"scrotal_male", "inguinal_male", "pregnant", "open_vulva", "large_nipples"),
check.names=TRUE, stringsAsFactors = FALSE)
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.