Ecological Archives A018-072-A2

David B. Lindenmayer, Jeff T. Wood, Ross B. Cunningham, Christopher MacGregor, Mason Crane, Damian Michael, Rebecca Montague-Drake, Darren Brown, Rachel Muntz, and A. Malcolm Gill. 2008. Testing hypotheses associated with bird responses to wildfire. Ecological Applications 18:1967–1983.

Appendix B. Covariates measured at the transect, plot and sub-plot level and in polygons around each site.
Covariates measured at: (A) the transect level, (B) 20 × 20 m plot level, (C) 1 × 1 m sub-plot level, and (D) in 200 m and 500 m polygons around each site (= landscape context variables).

Variable

Description

A. Transect level

 

Fire severity

Score based on the severity of the fire in 2003: 0 = no fire, 1 = understory burned; 2 = midstory burned but not killed; 3 = midstory killed; 4 = midstory killed and overstory burned

Time since fire

Time (years) since the last fire at a site. Based on fire mapping and historical records held by Parks Australia.

Wildfire frequency

Number of fires recorded as having occurred at a site given. Based on fire mapping and historical records held by Parks Australia.

Geology

Data extracted from detailed geology maps for Booderee National Park

Elevation

Data extracted from detailed topographic maps for Booderee National Park

Vegetation type

Dominant vegetation type on a site. Based on mapped vegetation classes by Taws (1998)

Dominant tree species

Based on assessment of trees on each transect, classified according to Costermans (1995)

B. Plot data

 

Slope

Measured using clinometer

Aspect

Measured with compass (due north = 0, no aspect = 999)

Max tree height

Measured using clinometer

Basal Count

Measured with dendrometer

Canopy depth

Tree height less height to lower branches

Number of layers

Number of vegetation layers. Layers were classified as follows: Overstory = >10 m; Overstory = >10 m; Midstory = 2 m<10 m; Understory = <2

Number of hollow bearing trees

Number of hollow bearing trees per plot

Number of dead trees

Number of dead trees per plot

Number of understory plants

Number of understory stems counted per plot

Number of middle story plants

Number of middle story stems counted per plot

Number of dead shrubs

Number of dead shrubs per plot

Number of logs

Number of logs (>10-cm diameter and >1-m long)

Rock cover

Percentage rock cover in 20 × 20 m plot

Genera and species counts

List of plants species in a 20 × 20 m plot – assigned into overstory, midstory and understory leading to a count of the number of genera and species

Percentage cover

Estimate percent cover of overstory, midstory, and understory plant species in each plot

Count of live stems

Count of live stems with each stem assigned to one of three diameter categories

C. Ground cover assessment

 

Percentage cover

Percentage cover of rock, leaf litter, bare earth/sand, bracken, grasses, regeneration (after 2003 wildfire), Bitou Bush, forbs, ferns.

D. Landscape context variables§

 

Number of vegetation types

Number of vegetation types in a polygon of 200- and 500-m radius around each field site

Area of vegetation type

The area of each vegetation types in a polygon of 200- and 500-m radius around each field site

Amount of human-disturbed vegetation cover

The area within a polygon of 200- and 500-m radius around each field site that had been heavily altered by human infrastructure

Distance to similar vegetation type

The distance from the edge of a polygon containing a given field site to the nearest (but spatially discrete) patch of vegetation of the same vegetation type

Percentage of green cover within 200 m and 500 m of site post 2003 fire

 

† Plot data were measured in two 20 × 20 m plots at each site.
‡ Ground cover measured in four 1 × 1 m subplots located within each 20 × 20 m plot.
§ Landscape context variables were measured in polygons of 200-m and 500-m radius around each field site.

LITERATURE CITED

Costermans, L. 1995. Native trees and shrubs of South-Eastern Australia. Rigby, Sydney, Australia.

Taws, N. 1998. Fire and vegetation management in Jervis Bay Territory. Environment Australia, Canberra, Australia.


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