Canada thistle
may change the fire ecology of the site in which it occurs by its abundant,
flammable aboveground biomass. For example, in boreal wet-meadows,
Canada thistle has the potential to increase fire
frequency and perhaps severity as a result of its abundant and readily ignited
litter [100].
The following table provides some historic fire regime intervals for habitats in which
Canada thistle may occur:
| Community or Ecosystem |
Dominant Species |
Fire Return Interval Range (years) |
| silver fir-Douglas-fir |
Abies amabilis-Pseudotsuga menziesii var. menziesii |
> 200 |
| grand fir |
A. grandis |
35-200 [9] |
| maple-beech-birch |
Acer-Fagus-Betula |
> 1000 |
| silver maple-American elm |
A. saccharinum-Ulmus americana |
< 35 to 200 |
| sugar maple |
A. s. |
> 1000 |
| sugar maple-basswood |
A. s.-Tilia americana |
> 1000 [234] |
| bluestem prairie |
Andropogon gerardii var. gerardii-Schizachyrium scoparium |
< 10 [118,169] |
| Nebraska sandhills prairie |
A. g. var. paucipilus-S. s. |
< 10 |
| bluestem-Sacahuista prairie |
A. littoralis-Spartina spartinae |
< 10 |
| sagebrush steppe |
Artemisia tridentata/Pseudoroegneria spicata |
20-70 [169] |
| basin big sagebrush |
A. t. var. tridentata |
12-43 [192] |
| mountain big sagebrush |
A. t. var. vaseyana |
20-60 [10,30] |
| Wyoming big sagebrush |
A. t. var. wyomingensis |
10-70 (40**) [232,252] |
| coastal sagebrush |
A. californica |
< 35 to < 100 |
| plains grasslands |
Bouteloua spp. |
< 35 |
| blue grama-needle-and-thread grass-western wheatgrass |
B. gracilis-Hesperostipa comata-Pascopyrum smithii |
< 35 |
| blue grama-buffalo grass |
B. g.-Buchloe dactyloides |
< 35 |
| cheatgrass |
Bromus tectorum |
< 10 |
| California montane chaparral |
Ceanothus and/or Arctostaphylos spp. |
50-100 [169] |
| sugarberry-America elm-green ash |
Celtis laevigata-Ulmus americana-Fraxinus pennsylvanica |
< 35 to 200 [234] |
| curlleaf mountain-mahogany* |
Cercocarpus ledifolius |
13-1000 [11,196] |
| mountain-mahogany-Gambel oak scrub |
C. l.-Quercus gambelii |
< 35 to < 100 |
| northern cordgrass prairie |
Distichlis spicata-Spartina spp. |
1-3 [169] |
| beech-sugar maple |
Fagus spp.-Acer saccharum |
> 1000 [234] |
| California steppe |
Festuca-Danthonia spp. |
< 35 [169] |
| black ash |
Fraxinus nigra |
< 35 to 200 [234] |
| juniper-oak savanna |
Juniperus ashei-Quercus virginiana |
< 35 |
| Ashe juniper |
J. a. |
< 35 |
| western juniper |
J. occidentalis |
20-70 |
| Rocky Mountain juniper |
J. scopulorum |
< 35 |
| tamarack |
Larix laricina |
35-200 [169] |
| western larch |
L. occidentalis |
25-100 [9] |
| yellow-poplar |
Liriodendron tulipifera |
< 35 [234] |
| wheatgrass plains grasslands |
Pascopyrum smithii |
< 35 [169] |
| Great Lakes spruce-fir |
Picea-Abies spp. |
35 to > 200 |
| northeastern spruce-fir |
P.-A. spp. |
35-200 [57] |
| Engelmann spruce-subalpine fir |
P. engelmannii-A. lasiocarpa |
35 to > 200 [9] |
| black spruce |
P. mariana |
35-200 |
| conifer bog* |
P. m.-Larix laricina |
35-200 [57] |
| blue spruce* |
P. pungens |
35-200 [9] |
| red spruce* |
P. rubens |
35-200 [57] |
| pine-cypress forest |
Pinus-Cupressus spp. |
< 35 to 200 [9] |
| pinyon-juniper |
P.-Juniperus spp. |
< 35 [169] |
| whitebark pine* |
P. albicaulis |
50-200 [9] |
| jack pine |
P. banksiana |
<35 to 200 [57] |
| Rocky Mountain lodgepole pine* |
P. contorta var. latifolia |
25-300+ [8,9,188] |
| Sierra lodgepole pine* |
P. c. var. murrayana |
35-200 [9] |
| shortleaf pine |
P. echinata |
2-15 |
| shortleaf pine-oak |
P. e.-Quercus spp. |
< 10 [234] |
| Colorado pinyon |
P. edulis |
10-49 [169] |
| South Florida slash pine |
P. elliottii var. densa |
1-5 [157,234] |
| Jeffrey pine |
P. jeffreyi |
5-30 |
| western white pine* |
P. monticola |
50-200 |
| Pacific ponderosa pine* |
P. ponderosa var. ponderosa |
1-47 |
| interior ponderosa pine* |
P. p. var. scopulorum |
2-10 |
| Arizona pine |
P. p. var. arizonica |
2-10 [9] |
| Table Mountain pine |
P. pungens |
< 35 to 200 [234] |
| red pine (Great Lakes region) |
P. resinosa |
10-200 (10**) [57,72] |
| red-white-jack pine* |
P. r.-P. strobus-P. banksiana |
10-300 [57,90] |
| pitch pine |
P. rigida |
6-25 [29,91] |
| eastern white pine |
P. strobus |
35-200 |
| eastern white pine-eastern hemlock |
P. s.-Tsuga canadensis |
35-200 |
| eastern white pine-northern red oak-red maple |
P. s.-Quercus rubra-Acer rubrum |
35-200 |
| loblolly pine |
P. taeda |
3-8 |
| loblolly-shortleaf pine |
P. t.-P. echinata |
10 to < 35 |
| Virginia pine |
P. virginiana |
10 to < 35 |
| Virginia pine-oak |
P. v.-Quercus spp. |
10 to < 35 [234] |
| eastern cottonwood |
Populus deltoides |
< 35 to 200 [169] |
| aspen-birch |
P. tremuloides-Betula papyrifera |
35-200 [57,234] |
| quaking aspen (west of the Great Plains) |
P. t. |
7-120 [9,82,142] |
| black cherry-sugar maple |
Prunus serotina-Acer saccharum |
> 1000 [234] |
| mountain grasslands |
Pseudoroegneria spicata |
3-40 (10**) [8,9] |
| Rocky Mountain Douglas-fir* |
Pseudotsuga menziesii var. glauca |
25-100 [9] |
| coastal Douglas-fir* |
P. m. var. menziesii |
40-240 [9,154,184] |
| California mixed evergreen |
P. m. var. m.-Lithocarpus densiflorus-Arbutus m. |
< 35 |
| California oakwoods |
Quercus spp. |
< 35 [9] |
| oak-hickory |
Q.-Carya spp. |
< 35[234] |
| oak-juniper woodland (Southwest) |
Q.-Juniperus spp. |
< 35 to < 200 [169] |
| northeastern oak-pine |
Q.-Pinus spp. |
10 to < 35 [234] |
| coast live oak |
Q. agrifolia |
<35 to 200 [9] |
| white oak-black oak-northern red oak |
Q. alba-Q. velutina-Q. rubra |
< 35 [234] |
| canyon live oak |
Q. chrysolepis |
<35 to 200 |
| blue oak-foothills pine |
Q. douglasii-P. sabiana |
<35 [9] |
| northern pin oak |
Q. ellipsoidalis |
< 35 [234] |
| Oregon white oak |
Q. garryana |
< 35 [9] |
| bear oak |
Q. ilicifolia |
< 35 >[234] |
| California black oak |
Q. kelloggii |
5-30 [169] |
| bur oak |
Q. macrocarpa |
< 10 |
| chestnut oak |
Q. prinus |
3-8 |
| northern red oak |
Q. rubra |
10 to < 35 |
| post oak-blackjack oak |
Q. stellata-Q. marilandica |
< 10 |
| black oak |
Q. velutina |
< 35 |
| live oak |
Q. virginiana |
10 to< 100 [234] |
| interior live oak |
Q. wislizenii |
< 35 [9] |
| blackland prairie |
Schizachyrium scoparium-Nassella leucotricha |
< 10 |
| Fayette prairie |
S. s.-Buchloe dactyloides |
< 10 |
| little bluestem-grama prairie |
S. s.-Bouteloua spp. |
< 35 |
| tule marshes |
Scirpus and/or Typha spp. |
< 35 [169] |
| redwood |
Sequoia sempervirens |
5-200 [9,62,210] |
| western redcedar-western hemlock |
Thuja plicata-Tsuga heterophylla |
> 200 [9] |
| eastern hemlock-yellow birch |
T. canadensis-Betula alleghaniensis |
> 200 [234] |
| western hemlock-Sitka spruce |
T. h.-Picea sitchensis |
> 200 |
| mountain hemlock* |
T. mertensiana |
35 to > 200 [9] |
| elm-ash-cottonwood |
Ulmus-Fraxinus-Populus spp. |
< 35 to 200 [57,234] |
*fire return interval varies widely; trends in variation are noted in the species summary