The impacts of light and light types on nocturnal carrion beetles silphidae including abb
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The impacts of light and light types on nocturnal carrion beetles (Silphidae) including ABB. Rachel M. Anschutz William J. Allgeier Daniel G. Snethen W. Wyatt Hoback. American Burying Beetle History. Once distributed over 35 U.S. states and three Canadian provinces.

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The impacts of light and light types on nocturnal carrion beetles silphidae including abb l.jpg

The impacts of light and light types on nocturnal carrion beetles (Silphidae) including ABB

Rachel M. Anschutz

William J. Allgeier

Daniel G. Snethen

W. Wyatt Hoback


American burying beetle history l.jpg
American Burying Beetle History beetles (Silphidae) including ABB

  • Once distributed over 35 U.S. states and three Canadian provinces.

  • During the 20th century its range shrank to less than 10% of this distribution.

  • The remaining populations are at the peripheries of the former range.


American burying beetle history3 l.jpg
American Burying Beetle History beetles (Silphidae) including ABB


Artificial light impacts l.jpg
Artificial Light Impacts beetles (Silphidae) including ABB

  • Artificial light disturbs nocturnal insects’ essential activities which include: migration, dispersal, foraging, mating, and reproduction.

  • Light types have different impacts

    • Usually ultraviolet light is most attractive while sodium vapor is least attractive.


Hypotheses l.jpg
Hypotheses beetles (Silphidae) including ABB

  • ABB will be most attracted to light that contains high levels of ultraviolet wave lengths.

  • Light will impact ABB behavior in responding to carrion resources.


Laboratory study l.jpg
Laboratory Study beetles (Silphidae) including ABB

  • 27 ABB were used once.

  • 19 liter buckets connected with P.V.C. pipe.

  • 5 types of light used:

    • Mercury Vapor

    • Incandescent

    • Fluorescent

    • Sodium Vapor

    • Blacklight

  • Controlled for intensity


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Laboratory Study beetles (Silphidae) including ABB

  • Conducted between 20:30 and 05:09.

  • 300 seconds to acclimate.

  • 600 seconds to choose.

  • Given two trials.


Laboratory results l.jpg
Laboratory Results beetles (Silphidae) including ABB

  • A chi-square goodness of fit test indicated that

  • attraction to these light sources is significantly different

  • (Chi-square=13.18, df=6, c.v.=12.59, p<0.05).


Field study l.jpg
Field Study beetles (Silphidae) including ABB

  • Three separate trapping arrays were established

    > than 1 km apart from each other.

60 meters


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Field Study beetles (Silphidae) including ABB

  • Mercury vapor, ultraviolet, and halogen

  • were alternated between array sites.

  • 24 nights of sampling.

  • Generators started 30 minutes before sunset and

  • ran all night.

  • Traps checked before starting generator and in

  • the morning prior to 0800.


Field results l.jpg
Field Results beetles (Silphidae) including ABB

  • 112 nocturnal beetles were trapped over 24 trap nights.

    • 32 ABB.


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Field Results beetles (Silphidae) including ABB

  • These results indicate that ABB foraging

  • behavior may be disrupted by the presence of lights in the environment.


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Field Results beetles (Silphidae) including ABB

  • ABB collected most frequently of nocturnally active beetles in lighted traps.

    • UV was the most attractive.

  • A trend is evident that indicates ABB to be more affected by light than other species of carrion beetles.


Significance l.jpg
Significance beetles (Silphidae) including ABB

  • MV lights have potential to significantly impact ABB.

  • Possibly explains why ABB has declined compared to other nocturnally active carrion beetle.

  • Reduction of light and alternative lighting types should be used in areas near the known range of ABB.


Acknowledgements l.jpg
Acknowledgements beetles (Silphidae) including ABB

  • U.S. Fish and Wildlife Service.

  • Nebraska Game and Parks Commission.


Questions l.jpg
Questions? beetles (Silphidae) including ABB


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