Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

A Visual Assay to Monitor T6SS-mediated Bacterial Competition08:45

A Visual Assay to Monitor T6SS-mediated Bacterial Competition

16.1K
We describe a qualitative assay to monitor bacterial competition mediated by the Pseudomonas aeruginosa type VI secretion system (T6SS). The assay relies on the survival/killing of Escherichia coli target cells carrying a lacZ-reporter. This technique is adjustable to assess the bactericidal/bacteriostasis activity of T6SS-proficient...
16.1K
Nanosponge Tunability in Size and Crosslinking Density11:15

Nanosponge Tunability in Size and Crosslinking Density

8.0K
This article describes a process for tuning the size and crosslinking density of covalently crosslinked nanoparticles from linear polyesters containing pendant functionality. By tailoring synthesis parameters (polymer molecular weight, pendant functionality incorporation, and crosslinker equivalents), a desired nanoparticle size and crosslinking density can be achieved for drug delivery...
8.0K
Competition02:34

Competition

24.3K
When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.
24.3K
Facilitated Transport01:19

Facilitated Transport

146.3K
The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
146.3K
Phase Transitions02:31

Phase Transitions

22.7K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
22.7K
Properties of Transition Metals02:58

Properties of Transition Metals

29.6K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.6K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Drivers and Consequences of Size Declines in Unicells.

Ecology letters·2026
Same author

Environmental predictability drives different routes to adaptation.

Evolution letters·2026
Same author

Evolutionary adaptation to global change reduces sustainable fisheries yields.

Science (New York, N.Y.)·2026
Same author

Street-dog policy in India is barking up the wrong tree.

Nature·2026
Same author

Hermaphrodites have lower metabolic rates than gonochores.

Proceedings. Biological sciences·2026
Same author

Factors associated with resource-intensive planned critical care admissions after elective surgery in patients with a planned admission to the intensive care unit.

British journal of anaesthesia·2025

Related Experiment Video

Updated: Jan 20, 2026

A Visual Assay to Monitor T6SS-mediated Bacterial Competition
08:45

A Visual Assay to Monitor T6SS-mediated Bacterial Competition

Published on: March 20, 2013

16.1K

Size and density mediate transitions between competition and facilitation.

Hayley Cameron1, Tim Coulson2, Dustin J Marshall1

  • 1Centre for Geometric Biology, School of Biological Sciences Monash University, Melbourne, Vic., Australia.

Ecology Letters
|August 31, 2019
PubMed
Summary

Species size and density critically influence ecological interactions. Small neighbors facilitate, while large ones compete, impacting population dynamics and life history pace.

Keywords:
Competitive hierarchyintegral projection modelinterspecific interactionslife historypopulation dynamicsresponse surfacetrait variation

More Related Videos

Nanosponge Tunability in Size and Crosslinking Density
11:15

Nanosponge Tunability in Size and Crosslinking Density

Published on: August 4, 2017

8.0K
Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles
07:47

Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles

Published on: November 27, 2015

11.3K

Related Experiment Videos

Last Updated: Jan 20, 2026

A Visual Assay to Monitor T6SS-mediated Bacterial Competition
08:45

A Visual Assay to Monitor T6SS-mediated Bacterial Competition

Published on: March 20, 2013

16.1K
Nanosponge Tunability in Size and Crosslinking Density
11:15

Nanosponge Tunability in Size and Crosslinking Density

Published on: August 4, 2017

8.0K
Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles
07:47

Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles

Published on: November 27, 2015

11.3K

Area of Science:

  • Ecology
  • Population Dynamics
  • Marine Biology

Background:

  • Species interactions range from competition to facilitation.
  • Size is a key factor mediating these interactions, but its demographic consequences remain unclear.
  • Understanding these dynamics is crucial for predicting population trajectories.

Discussion:

  • Heterospecific size and density interactively alter focal species population dynamics.
  • Small neighbors facilitate, while large neighbors compete, with density amplifying these effects.
  • These size-mediated interactions affect the pace of the focal species' life history.

Key Insights:

  • Demonstrates size and density mediating competition and facilitation from a population dynamics perspective.
  • Highlights the interactive effects of neighbor size and density on population dynamics.
  • Provides empirical data for size-structured population models.

Outlook:

  • Suggests size-mediated competition-facilitation is a ubiquitous but underappreciated ecological phenomenon.
  • Recommends incorporating size-specific data to avoid misinterpreting competitive hierarchies.
  • Emphasizes the need for further research into the demographic impacts of interspecific interactions.