• HOME
  • NEWS
  • EXPLORE
    • CAREER
      • Companies
      • Jobs
    • EVENTS
    • iGEM
      • News
      • Team
    • PHOTOS
    • VIDEO
    • WIKI
  • BLOG
  • COMMUNITY
    • FACEBOOK
    • INSTAGRAM
    • TWITTER
Saturday, October 4, 2025
BIOENGINEER.ORG
No Result
View All Result
  • Login
  • HOME
  • NEWS
  • EXPLORE
    • CAREER
      • Companies
      • Jobs
        • Lecturer
        • PhD Studentship
        • Postdoc
        • Research Assistant
    • EVENTS
    • iGEM
      • News
      • Team
    • PHOTOS
    • VIDEO
    • WIKI
  • BLOG
  • COMMUNITY
    • FACEBOOK
    • INSTAGRAM
    • TWITTER
  • HOME
  • NEWS
  • EXPLORE
    • CAREER
      • Companies
      • Jobs
        • Lecturer
        • PhD Studentship
        • Postdoc
        • Research Assistant
    • EVENTS
    • iGEM
      • News
      • Team
    • PHOTOS
    • VIDEO
    • WIKI
  • BLOG
  • COMMUNITY
    • FACEBOOK
    • INSTAGRAM
    • TWITTER
No Result
View All Result
Bioengineer.org
No Result
View All Result
Home NEWS Science News Biology

Mice are shrinking, but are climate change and cities to blame?

Bioengineer by Bioengineer
June 1, 2020
in Biology
Reading Time: 4 mins read
0
IMAGE
Share on FacebookShare on TwitterShare on LinkedinShare on RedditShare on Telegram

IMAGE

Credit: Bryan McLean

GAINESVILLE, Fla. — According to a well-studied but controversial principle known as Bergmann’s Rule, species tend to be larger in cold climates and smaller in warm ones. As human impacts heat the planet, will animals shrink over time?

To test this, a new study, published today in Scientific Reports, analyzed 70 years of records of the North American deer mouse, Peromyscus maniculatus, arguably the most common and best-documented mammal in the U.S.

Unexpectedly, researchers found deer mice are generally decreasing in mass over time, but this trend may not be linked to changes in climate or human population density, a proxy for urbanization. In another surprise finding, larger-bodied deer mouse populations are getting smaller and smaller-bodied populations are getting larger.

“The most exciting aspect of this study was one that still remains mysterious – deer mice appear to be getting smaller over time, but it doesn’t seem to directly relate to climatic drivers or urbanization,” said study co-lead author Robert Guralnick, curator of bioinformatics at the Florida Museum of Natural History. “Is this generally true for mammals?”

Why study body-size trends in the first place? Body size is a particularly important physical characteristic in warm-blooded animals because it helps maintain the right body temperature for biological functions such as metabolism and heat transfer.

“Even in a small mammal like this, a minor change in body mass could have really important consequences for optimizing those energy balances,” said study co-author Bryan McLean, assistant professor at the University of North Carolina Greensboro and a former postdoctoral fellow researcher at the Florida Museum.

Larger-bodied animals have less body surface – which releases heat – relative to the volume of their bodies, so they may cope with the cold better than their smaller-bodied kin, the thermodynamic foundation of Bergmann’s Rule. Because body size affects thermoregulation, changes in body size could influence animals’ resilience to climate change.

To examine changes in the deer mouse’s body size in relation to space, time, climate and human population density, Guralnick and his collaborators turned to three sources of data: museum collections, the “North American Census of Small Mammals” and the National Ecological Observatory Network, known as NEON. Using these resources, they compiled body length and mass measurements taken by thousands of researchers across the U.S. over seven decades. The result? A certifiable time machine to observe these mice throughout recent history and the first study of body-size trends in mammals that combines data from published surveys and museum collections.

“I don’t think anyone has combined museum data with NEON data and historical data like we have. We have such a larger dataset because of this,” said study co-lead author Maggie Hantak, a postdoctoral researcher at the Florida Museum. “It’s a really novel way to see how body size is changing over space and time.”

Their findings indicate deer mice in colder climates tend to be longer and have bigger body mass, consistent with Bergmann’s Rule. As temperature changed across space, deer mice body mass decreased, which also aligned with the researchers’ hypothesis. As precipitation increased, however, researchers expected an increase in mouse body mass due to the boost rainfall can give to foraging resources. Instead, body mass also decreased.

The findings were more complicated in cities: Urban areas are significantly warmer than the surrounding rural landscape, a phenomenon known as the urban heat island effect. According to Bergmann’s Rule, mice should be smaller in urban areas to beat the heat. But since human food and garbage abound in cities, mice could grow larger by tapping into that constant supply of fuel.

The data showed that as human population density increased, deer mice populations tended to retain the same body mass, but grow shorter in length. This could mean the urban heat island effect trumps the benefit of endless food resources – or simply that shorter mice are better at hiding from humans.

But the real head-scratcher came when the team decoupled mouse mass from all of these factors. They still noted a general decrease in mass over time, hinting that the roles of climate and urbanization in influencing body size may be more complicated than previously thought.

“Preliminarily, this is very intriguing, but we still don’t know what drives this decrease in mass,” Guralnick said.

The team will now turn its attention to analyzing body size across all mammals, he said.

“One big question is what the future will look like for mammals across the planet, and the way we’re going to know best is by knowing what’s happened in the past,” Guralnick said. “Natural history collections and their data are excellent ways for us to get a comprehensive, often broad, view of change. Body size is a hugely important variable, and it’s one that’s recorded in literally millions of specimen records.”

###

Daijiang Li of the Florida Museum also co-authored the study.

Media Contact
Natalie van Hoose
[email protected]

Original Source

https://www.floridamuseum.ufl.edu/science/mice-are-shrinking/

Related Journal Article

http://dx.doi.org/10.1038/s41598-020-65755-x

Tags: BioinformaticsBiologyClimate ChangeEvolutionPopulation Biology
Share12Tweet8Share2ShareShareShare2

Related Posts

“Rice Cultivar Transcriptome Reveals Heat Stress Response Genes”

“Rice Cultivar Transcriptome Reveals Heat Stress Response Genes”

October 4, 2025
blank

Revolutionary Graph Network Enhances Protein Interaction Prediction

October 4, 2025

DOG Gene Family in Wheat Drives Seed Dormancy

October 4, 2025

Discovery of MrSTP20: Sugar Transporter in Salt Stress

October 4, 2025
Please login to join discussion

POPULAR NEWS

  • New Study Reveals the Science Behind Exercise and Weight Loss

    New Study Reveals the Science Behind Exercise and Weight Loss

    94 shares
    Share 38 Tweet 24
  • New Study Indicates Children’s Risk of Long COVID Could Double Following a Second Infection – The Lancet Infectious Diseases

    90 shares
    Share 36 Tweet 23
  • Physicists Develop Visible Time Crystal for the First Time

    75 shares
    Share 30 Tweet 19
  • New Insights Suggest ALS May Be an Autoimmune Disease

    70 shares
    Share 28 Tweet 18

About

We bring you the latest biotechnology news from best research centers and universities around the world. Check our website.

Follow us

Recent News

Selective Arylating Uncommon C–F Bonds in Polyfluoroarenes

HIRAID Framework Enhances Nurse and Patient Outcomes

tRF-34-86J8WPMN1E8Y2Q Fuels Gastric Cancer Progression

Subscribe to Blog via Email

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

Join 62 other subscribers
  • Contact Us

Bioengineer.org © Copyright 2023 All Rights Reserved.

Welcome Back!

Login to your account below

Forgotten Password?

Retrieve your password

Please enter your username or email address to reset your password.

Log In
No Result
View All Result
  • Homepages
    • Home Page 1
    • Home Page 2
  • News
  • National
  • Business
  • Health
  • Lifestyle
  • Science

Bioengineer.org © Copyright 2023 All Rights Reserved.