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Related Concept Videos

Predator-Prey Interactions02:39

Predator-Prey Interactions

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Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
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Frequency-dependent Selection01:21

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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pH Scale02:41

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Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means of...
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Scaling01:26

Scaling

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In designing and analyzing filters, resonant circuits, or circuit analysis at large, working with standard element values like 1 ohm, 1 henry, or 1 farad can be convenient before scaling these values to more realistic figures. This approach is widely utilized by not employing realistic element values in numerous examples and problems; it simplifies mastering circuit analysis through convenient component values. The complexity of calculations is thereby reduced, with the understanding that...
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Drug Dependence01:17

Drug Dependence

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Medications are typically administered to achieve therapeutic effects. Some drugs can modify an individual's mood and perception, frequently resulting in various enjoyable experiences. However, this can result in drug dependency, a condition marked by continuous drug use despite potential negative consequences. Drug dependency primarily falls into two categories: psychological and physical dependence. Psychological dependence occurs when the pleasurable feelings induced by the drug...
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Contact-dependent Signaling01:19

Contact-dependent Signaling

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Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
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Testing Nicotine Tolerance in Aphids Using an Artificial Diet Experiment
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Predator-prey interactions in a ladybeetle-aphid system depend on spatial scale.

Wei-Ting Lin1, Steven C Pennings1

  • 1Department of Biology and Biochemistry University of Houston Houston Texas USA.

Ecology and Evolution
|July 25, 2018
PubMed
Summary

Species interactions, like ladybeetle-aphid predator-prey dynamics, change with spatial scale. Small-scale suppression effects diminish at larger scales due to dispersal limitations, impacting ecological interpretations.

Keywords:
AphidsCoccinellidsCycloneda sanguineaIva frutescensUroleucon ambrosiaemetacommunityscale‐dependentspatial scalespecies interaction

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Area of Science:

  • Ecology
  • Predator-prey dynamics
  • Spatial ecology

Background:

  • Species interactions can yield different outcomes depending on the spatial scale of observation.
  • Small-scale experimental results may not accurately represent landscape-scale ecological processes.
  • Ladybeetle-aphid systems exemplify how scale influences the interpretation of predator-prey interactions.

Purpose of the Study:

  • To investigate how predator-prey interactions, specifically between ladybeetles and aphids, vary across different spatial scales.
  • To compare experimental findings with a spatially explicit metacommunity model to understand scale-dependent dynamics.
  • To elucidate the role of dispersal in mediating these interactions at various spatial resolutions.

Main Methods:

  • Conducted an experiment using 81 potted plants to analyze interactions across four distinct spatial scales.
  • Simulated a spatially explicit metacommunity model in parallel with the experiment.
  • Quantified the effects of ladybeetles on aphids and vice versa at each spatial scale.

Main Results:

  • The suppressive effect of ladybeetles on aphids decreased as spatial scale increased.
  • Aphid-induced increases in ladybeetle populations were most pronounced at the three-plant scale.
  • Model simulations, even without predator demographic dynamics, mirrored experimental results, highlighting dispersal as a key factor.

Conclusions:

  • Predator-prey interactions are scale-dependent, with effects diminishing at larger spatial scales due to dispersal limitations.
  • Dispersal significantly influences predator population dynamics and interaction strength across scales.
  • Integrating multi-scale approaches is crucial for bridging small-scale experimental findings with landscape-level ecological challenges.