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Activity for Solving Crimes with the Necrobiome

Illustration of a magnifying glass showing bacteria on the outline of a body.

Topic

  • Microbiology
  • Bacteria
  • Microbial Ecology

Resource Type

  • Activities
  • Film Activities

Level

High School — GeneralHigh School — AP/IBCollege
Saved By
19 Users
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Description

This activity explores content presented in the animated video Solving Crimes with the Necrobiome, which describes the microbial changes associated with decomposing corpses.

In the video, Ed Yong and scientist Jessica Metcalf describe how a community of many microbes, known as the necrobiome, takes over our bodies after we die. Scientists study the necrobiome to better understand the process of decomposition. This research also provides tools for criminal investigators. For example, forensic experiments have shown that it may be possible to estimate time of death by sequencing the DNA of microbes found on and around corpses.

The “Student Handout” probes students’ understanding of the key concepts addressed in the film. The “Educator Materials” document provides suggested pause points in the film with questions for students, background information, and detailed discussion points; a list of related resources and references; and an answer key for the “Student Handout.”

The “Resource Google Folder” link directs to a Google Drive folder of resource documents in the Google Docs format. Not all downloadable documents for the resource may be available in this format. The Google Drive folder is set as “View Only”; to save a copy of a document in this folder to your Google Drive, open that document, then select File → “Make a copy.” These documents can be copied, modified, and distributed online following the Terms of Use listed in the “Details” section below, including crediting BioInteractive.

Student Learning Targets

  • Describe the process of decomposition and the role it plays in an ecosystem.
  • Explain how the microbiome associated with a decomposing body can be used to estimate the time since death.
  • Interpret evidence to support or refute a scientific argument.

Estimated Time

One 50-minute class period.

Key Terms

crime scene investigation, decomposition, DNA sequencing, ecological succession, forensics, microbiome, nutrient cycling, time of death

Primary Literature

Metcalf, Jessica L., Laura Wegener Parfrey, Antonio Gonzalez, Christian L. Lauber, Dan Knights, Gail Ackermann, Gregory C. Humphrey, et al. "A microbial clock provides an accurate estimate of the postmortem interval in a mouse model system." eLife 2 (2013). https://doi.org/10.7554/elife.01104. 

Metcalf, Jessica L., Zhenjiang Zech Xu, Sophie Weiss, Simon Lax, Will Van Treuren, Embriette R. Hyde, Se Jin Song, et al. “Microbial community assembly and metabolic function during mammalian corpse decomposition.” Science 351, 6269 (2016): 158–162. https://doi.org/10.1126/science.aad2646. 

Pechal, Jennifer L., Tawni L. Crippen, M. Eric Benbow, Aaron M. Tarone, Scot Dowd, and Jeffery K. Tomberlin. “The potential use of bacterial community succession in forensics as described by high throughput metagenomic sequencing.” International Journal of Legal Medicine 128, 1 (2014): 193–205. https://doi.org/10.1007/s00414-013-0872-1. 
 

Terms of Use

Please see the Terms of Use for information on how this resource can be used.

Accessibility Level (WCAG compliance)

PDF files meet criteria.

Version History

Date Published 04.21.20

NGSS (2013)

HS-LS2-2, HS-LS2-4

AP Biology (2019)

ENE-1.O, ENE-4.B, SYI-1.G, SYI-2.B; SP1, SP6

IB Biology (2016)

II.A, II.B, II.C, II.E

AP Environmental Science (2020)

Topic(s): 1.4, 1.11
Learning Objectives & Practices: ERT-1.D, ENG-1.D, SP2

IB Environmental Systems and Societies (2017)

2.2, 2.3

Vision and Change (2009)

CC5

Materials

Resource Google Folder (Link)
Educator Materials (PDF) 2 MB
Student Handout (PDF) 2 MB
Decomposition Diagram (JPG) 8 MB

Use This Resource With

Video Resource
Solving Crimes with the Necrobiome

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