# R: Defoliated by gypsy moth each in northeast US 1975-2002.

gm {epimdr} | R Documentation

## Defoliated by gypsy moth each in northeast US 1975-2002.

### Description

A dataset containing the fraction of forest defoliated by the gypsy moth in 20km x 20km pixels across northeast US in each year between 1975 and 2002.

### Usage

    gm

### Format

A data frame with 1086 rows and 30 variables:

UTMX

  UTM x-coordinates

UTMY

  UTM y-coordinates

d1975

  Defolitation in 1975

d1976

  Defolitation in 1976

d1977

  Defolitation in 1977

d1978

  Defolitation in 1978

d1979

  Defolitation in 1979

d1980

  Defolitation in 1980

d1981

  Defolitation in 1981

d1982

  Defolitation in 1982

d1983

  Defolitation in 1983

d1984

  Defolitation in 1984

d1985

  Defolitation in 1985

d1986

  Defolitation in 1986

d1987

  Defolitation in 1987

d1988

  Defolitation in 1988

d1989

  Defolitation in 1989

d1990

  Defolitation in 1990

d1991

  Defolitation in 1991

d1992

  Defolitation in 1992

d1993

  Defolitation in 1993

d1994

  Defolitation in 1994

d1995

  Defolitation in 1995

d1996

  Defolitation in 1996

d1997

  Defolitation in 1997

d1998

  Defolitation in 1998

d1999

  Defolitation in 1999

d2000

  Defolitation in 2000

d2001

  Defolitation in 2001

d2002

  Defolitation in 2002

### Source

Bjornstad, O. N., Robinet, C., & Liebhold, A. M. (2010). Geographic variation in North American gypsy moth cycles: subharmonics, generalist predators, and spatial coupling. Ecology, 91(1), 106-118. doi.org/10.1890/08-1246.1.

[Package epimdr version 0.6-4 Index]