Arthropod response to prescribed seasonal burns ashley schafer
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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.

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Arthropod response to prescribed seasonal burns ashley schafer

Arthropod Response to Prescribed Seasonal BurnsASHLEY sCHAFER

Mentor: Scott Collins


Wildfire in southwest
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
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

Spring

Summer

growing

dormant post-growth

dormant pre-growth


Fire impact on arthropods
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
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
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
Methods: The Field

  • 200 pitfall traps

  • Solitary, terrestrial insects

  • Open 96 hours every two weeks- 4 total collections


Methods the lab
Methods: The Lab

  • Sort and Identify


Solitary terrestrial taxa
Solitary, Terrestrial Taxa

Cicindela leminiscata

Beetles

Grasshoppers

Spiders

Scorpions

Psuedoscorpions

Wind scorpions

True Bugs

Velvet Ants

Mites

Walking stick

Centipedes

Spheridae

Brochymena sp.

Dasymutilla sp

Vaejovis sp.

Latrodectus Hesperus

Eremobates sp.

Order Psuedoscorpionides

Trombidium

Parabacillus coloradus

Scolopendra polymorpha


Abundance per treatment
Abundance per Treatment

ANOVA

P= 0.9943



Ordination
Ordination

Ordination- Burn Treatments Connected

  • 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

C= Control

F= Fall

SP= Spring

SU= Summer

1= 6/16/08

2= 6/30/08

3= 7/14/08

4= 7/28/08

Ordination- Collection Dates Connected


Total abundance
Total Abundance

Total Abundance per Treatment – 6/16

Total Abundance per Treatment – 7/14

C=Control

J= June

(Summer)

M= March

(Spring)

O= October

(Fall)

P= 0.0164

P= 0.9142

O

O

Total Abundance per Treatment- 6/30

Total Abundance per Treatment – 7/28

P from ANOVA

P= 0.2220

P= 0.7182

O

O


Beetle abundance
Beetle Abundance

Beetle Abundance per Treatment – 6/16

Beetle Abundance per Treatment – 7/14

C=Control

J= June

(June)

M= March

(Spring)

O= October

(Fall)

P= 0.1057

P= 0.8555

O

O

Beetle Abundance per Treatment – 6/16

P from ANOVA

Beetle Abundance per Treatment – 7/28

P= 0.1186

P= 0.5696

O

O


Total richness
Total Richness

Richness per Treatment – 7/14

Richness per Treatment – 6/16

C=Control

J= June

(Summer)

M= March

(Spring)

O= October

(Fall)

P= 0.7551

P= 0.1211

O

O

Richness per Treatment – 7/28

P from ANOVA

Richness per Treatment – 6/30

P= 0.0517

P= 0.7476

O

O


Beetle richness
Beetle Richness

Beetle Richness per Treatment – 6/16

Beetle Richness per Treatment – 7/14

C=Control

J= June

(Summer)

M= March

(Spring)

O= October

(Fall)

P= 0.8152

P= 0.0612

O

O

Beetle Richness per Treatment – 6/30

Beetle Richness per Treatment – 7/28

P from ANOVA

P= 0.6111

P= 0.1879

O

O



Conclusions abundance
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
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
Discussion

  • Arthropod diversity and abundance increased after monsoons

  • Not impacted by prescribed firetreatments

    • Short term (within one year of burn) prescribed fire does not impact biodiversity negatively or positively

    • Burn season did not matter


Discussion1
Discussion

  • Future:

    • Continuing to monitor pitfall traps at the burn plots through the fall semester

    • Extend study to future years


Acknowledgements
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



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