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Arthropod Response to Prescribed Seasonal Burns ASHLEY sCHAFER. Mentor: Scott Collins. Wildfire in Southwest. Suppression Property protection Livestock grazing Wildfire increases biodiversity Southwest semi-arid grasslands Returns nutrients to soil Opens patches of land. Fire Ecology. - PowerPoint PPT Presentation
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ARTHROPOD RESPONSE TO PRESCRIBED SEASONAL
BURNSASHLEY SCHAFER
Mentor: Scott Collins
Wildfire in Southwest
Suppression Property protection Livestock grazing
Wildfire increases biodiversity
Southwest semi-arid grasslands Returns nutrients to soil Opens patches of land
Fire Ecology
Utilize prescribed fire to increase replenish biodiversity
Benefits associated with season (Ford 2007) Growing season – no long-term impact on
biodiversity Dormant season – increase biodiversity
Sevilleta National Wildlife Refuge seasonal burn plots
Fall
dormant pre-growth
Spring
dormant post-growth
Summer
growing
Fire Impact on Arthropods
Researchers focusing on fire impact on arthropods (mainly insects) (Swengel 2001)
Why care about invertebrate response? Arthropods important food source for
vertebrates Pollinators Pests
Insect diversity increases after fire (Swengel 2001)
Research Questions:
How does fire impact arthropod diversity and abundance?
What is the most beneficial season (dormant pre-growth, dormant post-growth, and growing) to burn in order to increase arthropod diversity?
How does the monsoon season impact arthropod diversity and abundance?
Research Site
Sevilleta National Wildlife Refuge
20 plots (60 m x 40 m) 5 control 5 fall (October) 5 spring (March) 5 summer (June)
Methods: The Field
200 pitfall traps Solitary, terrestrial insects Open 96 hours every two weeks- 4 total collections
Methods: The Lab
Sort and Identify
Solitary, Terrestrial Taxa
Eleodes longicollisLanelater sp.TenebrionidaePhyllophaga sp.Arenivaga sp.Edrotes sp.CurculionidaeAraeoschizus sp.Scyphophorus sp.GerstaeckeriaPasimachus sp.HisteridaeOmurgus scutellarisAmblycheila cyclindriformes
Harpalini sp.Agryphus sp.Diplotaxis sp.Cremastocheilus sp.Melanotus sp.PhengodidaeOphrayastes sp.
Brochymena sp.
Geolycosa sp.Drassyllus sp.Gnaphosa sp.Neoanagraphis sp.Steatoda sp.Psilochorus imitatusMecaphesa sp.Haplodrassus sp.Mimetus sp.Herpyllus sp.Habronattus sp.Euryopis sp.Oxypes sp.Micaria sp.Hphonopelma sp.
Ceuthophilus sp.Psoloessa sp.Cordillacris sp.Timerotropis sp.
Cicindela leminiscata Spheridae
Vaejovis sp.Eremobates sp.
Dasymutilla spLatrodectus HesperusOrder Psuedoscorpionides
Parabacillus coloradus Scolopendra polymorphaTrombidium
BeetlesGrasshoppersSpidersScorpionsPsuedoscorpionsWind scorpionsTrue BugsVelvet AntsMitesWalking stickCentipedes
Abundance per Treatment
ANOVAP= 0.9943
Burn Treatment Abundance and Richness Comparisons
Ordination
172 Species Not all terrestrial and
solitary Flies Bees Flying Ants Termites Moths
Not all Identified Sorted and counted
based on number system
DAC Detrended
Correspondence Analysis
Ordination- Burn Treatments Connected
Ordination- Collection Dates Connected
C= ControlF= FallSP= Spring SU= Summer
1= 6/16/082= 6/30/083= 7/14/084= 7/28/08
Total Abundance
P= 0.9142
P= 0.0164
P= 0.7182
P= 0.2220
O
O O
O
C=ControlJ= June (Summer)M= March (Spring)O= October (Fall)
P from ANOVA
Beetle Abundance
P= 0.8555 P= 0.1057
P= 0.1186
O
O
O
O
C=ControlJ= June (June)M= March (Spring)O= October (Fall)
P from ANOVA
P= 0.5696
O
Total Richness
P= 0.7551
P= 0.7476
P= 0.0517
P= 0.1211
OO
O
C=ControlJ= June (Summer)M= March (Spring)O= October (Fall)
P from ANOVA
O
O
Beetle Richness
P= 0.8152
P= 0.6111
P= 0.0612
P= 0.1879
O
O
C=ControlJ= June (Summer)M= March (Spring)O= October (Fall)
P from ANOVA
Monsoon Season
Conclusions- Abundance
How do different seasonal prescribed burn treatments impact arthropod abundance? Terrestrial, solitary arthropod abundance analysis
Specified taxa not significantly impacted by different burn treatments
Total arthropod abundance analysis: Overall arthropod abundance not significantly impacted by different
burn treatments. Beetle abundance analysis:
Most common insect (beetle) abundance not impacted by different burn treatments.
Collection Date Analysis Monsoons significantly impact arthropod abundance.
Conclusions- Richness
How do different seasonal prescribed burn treatments impact arthropod richness Total arthropod richness analysis:
Overall arthropod richness not significantly impacted by different treatments
Beetle richness analysis Beetle richness not significantly impacted by
different treatments Collection date analysis:
Monsoons significantly increase species richness
Discussion
Arthropod diversity and abundance increased after monsoons
Not impacted by prescribed fire treatments Short term (within one year of burn)
prescribed fire does not impact biodiversity negatively or positively
Burn season did not matter
Discussion
Future: Continuing to monitor pitfall
traps at the burn plots through the fall semester
Extend study to future years
Acknowledgements
National Science Foundation
Sevilleta National Wildlife Refuge and LTER
2008 REU Program
University of New Mexico
Fish and Wildlife Service
Jennifer Johnson
Scott Collins
Arthropod Museum at UNM
Interns + REUS:
Scott Johnson
Ashley Melendez
Christine Waters
CJ Jewell
Questions?
Bye!