Powdermill Biological Station Small Mammal Database
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Overview:
Powdermill Nature Reserve monitored small mammal populations from 1979-1999.
Submitted 13 years 10 months ago by Morgan Ernest.
Last modified:
2016
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_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.
Collection site(s):
Pennsylvania
Collection timespan:
1978 to 1998
Is time series:
Includes time series