NOV 26, 2018 05:33 AM PST

Predation Drives Reproductive Patterns in Rodents, Study Finds

Smaller mammals, especially rodents, are rather low on the universal food chain. Due to the nature of their bite-sized physique, larger predators often take full advantage to satisfy their never-ending appetites.

Given what we know about rodents and their instrumental role in the universal food chain, why is it that their population numbers seem to rise exponentially? This question has riddled the minds of researchers for ages, but a study recently published in the journal Scientific Reports by researchers from the University of Jyväskylä appears to shed some light on the matter.

Image Credit: Pixabay

As it would seem, being on the menu for the vast majority of larger predators may benefit rodents more than it hurts them, at least in the long run.

Rodent mothers exposed to predation risks seemed to produce litters with up to 50% more pups than rodent mothers that weren’t exposed to the same predation risks. The findings illustrate how predation could act as a significant driver for shaping rodent populations in certain circumstances.

In addition to the apparent differences in litter sizes produced by rodent mothers, the researchers learned that frightening experiences involving predators could also impact how female and male rodents behave.

Related: Here's why rats are so difficult to get rid of

Male rodents that experience close calls with predators reportedly exhibit chemical signals that their female counterparts can sense. When a female rodent detects an elevated risk of predation, which a frightened male rodent might denote, they then try harder to reproduce sooner because they don’t know if they’ll get another chance later.

As it would seem, predation works as both a reproductive motivator and a mechanism for compensative litter frequency and size adjustments. Consequently, a rodent mother’s genes have a better chance of living on whether she gets eaten by a predator or not.

"This innovative experimental study bridges the proximate and ultimate explanations of small mammal behavioral responses. It's been long hypothesized that small, highly fecund (so-called "r-selected") species like voles might respond to heavy predation via reproductive compensation. This field study shows how these responses are mediated via chemo-olfactory cues," commented ecologist Danielle Lee from Southern Illinois University, who was not involved in the research.

"The work demonstrates once again the importance of this modality for intraspecific communication, population regulation, and trophic interactions."

Related: Communal rearing better prepares mice for the real world, study finds

It should be interesting to see whether future studies validate these results in other rodent species, and perhaps more importantly, in larger non-rodent vertebrates. After all, rodents aren’t the only animals on the planet subjected to predation.

Source: Phys.org, Scientific Reports

About the Author
  • Fascinated by scientific discoveries and media, Anthony found his way here at LabRoots, where he would be able to dabble in the two. Anthony is a technology junkie that has vast experience in computer systems and automobile mechanics, as opposite as those sound.
You May Also Like
OCT 16, 2019
Plants & Animals
OCT 16, 2019
These Animals Are Among the Deadliest in the United States
It’s no secret that some animals are more deadly than others, and chances are, you’d be able to guess a few of them. An estimated 400 people di...
OCT 16, 2019
Chemistry & Physics
OCT 16, 2019
Irish Teen Removes Microplastics From Water, Wins Google Science Fair
A new invention that removes microplastics from water was designed by 18-year-old Fionn Ferreira -- winner of the Google Science Fair....
OCT 16, 2019
Plants & Animals
OCT 16, 2019
Giraffe Conservation Gets More Serious as Species Gains New Protections
One of the world’s most distinguishable long-necked animals, the giraffe, appears to be headed for a troubling future in the eyes of animal conservat...
OCT 16, 2019
Microbiology
OCT 16, 2019
Antibiotic Resistance Rises in Wild Dolphins
Antibiotic resistant bacteria are considered a major threat to public health, which is expected to get more serious....
OCT 16, 2019
Neuroscience
OCT 16, 2019
Rats play hide-and-seek, and jump for joy when they win
Play is not just for humans - many animals including dolphins, cats, dogs, otters, and ravens engage in playful behavior. Studying the neuroscience behind play, however, is challenging; it mu...
OCT 16, 2019
Health & Medicine
OCT 16, 2019
Medical Marijuana Allowed in California K-12 Schools
Gavin Newson, the governor of California and the leading 2016 proponent of the recreational pot legalization initiative Proposition 64, signed a bill on We...
Loading Comments...