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Responses of prairie arthropod communities to fire and fertilizer: Balancing plant and arthropod conservation

American Midland Naturalist

By:
, , , and
DOI: 10.1674/0003-0031(2007)157[92:ROPACT]2.0.CO;2

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Abstract

Fire is an important tool for limiting woody plant invasions into prairies, but using fire management to maintain grassland plant communities may inadvertently reduce arthropod diversity. To test this, we established twenty-four 100 m2 plots in a tallgrass prairie in Galveston County, Texas, in spring 2000. Plots were assigned a fire (no burn, one time burn [2000], two time burn [2000, 2001]) and fertilization treatment (none, NPK addition) in a full factorial design. Fertilization treatments allowed us to examine the effects of fire at a different level of productivity. We measured plant cover by species and sampled arthropods with sweep nets during the 2001 growing season. Path analysis indicated that fertilization reduced while annual fires increased arthropod diversity via increases and decreases in woody plant abundance, respectively. There was no direct effect of fire on arthropod diversity or abundance. Diptera and Homoptera exhibited particularly strong positive responses to fires. Lepidoptera had a negative response to nutrient enrichment. Overall, the negative effects of fire on the arthropod community were minor in contrast to the strong positive indirect effects of small-scale burning on arthropod diversity if conservation of particular taxa is not a priority. The same fire regime that minimized woody plant invasion also maximized arthropod diversity.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Responses of prairie arthropod communities to fire and fertilizer: Balancing plant and arthropod conservation
Series title:
American Midland Naturalist
DOI:
10.1674/0003-0031(2007)157[92:ROPACT]2.0.CO;2
Volume
157
Issue:
1
Year Published:
2007
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
American Midland Naturalist
First page:
92
Last page:
105
Number of Pages:
14