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Related Concept Videos

Evolutionary Psychology01:20

Evolutionary Psychology

Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the human psyche...
Limits to Natural Selection01:38

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
Inclusive Fitness00:57

Inclusive Fitness

Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
Adaptability of Cytoskeletal Filaments01:12

Adaptability of Cytoskeletal Filaments

The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
Criticisms of the Evolutionary Perspective01:23

Criticisms of the Evolutionary Perspective

In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
Evolutionary psychology provides one explanation for these findings, suggesting...

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Related Experiment Video

Updated: Jun 6, 2026

Studying the Neural Basis of Adaptive Locomotor Behavior in Insects
10:19

Studying the Neural Basis of Adaptive Locomotor Behavior in Insects

Published on: April 13, 2011

Functional relations between locomotor performance traits in spiders and implications for evolutionary hypotheses.

John Prenter1, Diana Pérez-Staples, Phillip W Taylor

  • 1Department of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia. john.prenter@mq.edu.au.

BMC Research Notes
|November 18, 2010
PubMed
Summary

In web spiders, running and climbing abilities are linked, suggesting a common locomotor capacity. However, this connection was not observed in a jumping spider species, indicating varied locomotor strategies.

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Kinematics and Ground Reaction Force Determination: A Demonstration Quantifying Locomotor Abilities of Young Adult, Middle-aged, and Geriatric Rats

Published on: February 22, 2011

Area of Science:

  • * Evolutionary biology
  • * Animal locomotion
  • * Sexual size dimorphism

Background:

  • * Locomotor performance is crucial for individual fitness in many species.
  • * The evolution of extreme sexual size dimorphism (SSD) in spiders is debated, with proposed advantages for males in running versus climbing.
  • * Previous models often treated running and climbing as separate activities, overlooking shared underlying capacities.

Purpose of the Study:

  • * To investigate the relationship between maximum running and climbing performance in male spiders.
  • * To determine if running and climbing reflect common locomotor capacities or distinct abilities.
  • * To test for performance trade-offs between horizontal running and vertical climbing.

Main Methods:

  • * Examined maximum climbing and running speeds in males of three spider species: two orb-web spiders (Argiope keyserlingi, Nephila plumipes) with high SSD and one jumping spider (Jacksonoides queenslandica) with low SSD.
  • * Assessed locomotor performance in ecologically relevant activities.

Main Results:

  • * Positive correlation between running and climbing speeds in orb-web spiders (A. keyserlingi, N. plumipes), indicating shared underlying capacities.
  • * No significant relationship between running and climbing speeds in the jumping spider (J. queenslandica).
  • * No evidence of a performance trade-off between running and climbing was found in any species.

Conclusions:

  • * Climbing and running represent a unified locomotor performance characteristic in web spiders but not in the studied jumping spider.
  • * The findings challenge the assumption of functionally distinct running and climbing capacities in spiders with high SSD.
  • * Highlights the importance of examining relationships between different locomotor activities when testing evolutionary hypotheses.