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Related Concept Videos

Predator-Prey Interactions02:39

Predator-Prey Interactions

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.Although predation is commonly associated with carnivory, for...
Frequency-dependent Selection01:21

Frequency-dependent Selection

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.Positive Frequency-Dependent SelectionIn positive...
Distribution and Dispersion00:54

Distribution and Dispersion

Ecology is the study of how organisms interact with their environment and with one another. An important aspect of ecology is understanding where species are found and how individuals are distributed within those areas. The geographic range of a species refers to the total area where its members are located, while dispersion describes the pattern of spacing of individuals within that range.Geographic Range and Dispersion PatternsWithin a species’ geographic range, individuals may be distributed...
Migration00:53

Migration

Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
Habitat Fragmentation02:31

Habitat Fragmentation

Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...

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Administering and Detecting Protein Marks on Arthropods for Dispersal Research
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Published on: January 28, 2016

Notonecta exhibit threat-sensitive, predator-induced dispersal.

Shannon J McCauley1, Locke Rowe

  • 1Ecology & Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada. shannon.mccauley@utoronto.ca

Biology Letters
|February 19, 2010
PubMed
Summary
This summary is machine-generated.

Predation risk from fish drives aquatic insects to disperse more frequently from their habitats. Higher perceived risk leads to increased dispersal rates, influencing broader community structures in landscapes.

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Area of Science:

  • Ecology
  • Behavioral Ecology
  • Landscape Ecology

Background:

  • Dispersal is key to community structure in diverse landscapes.
  • Species interactions influence dispersal, but inter-habitat movement is less understood.
  • Predation risk is a significant factor in species interactions.

Purpose of the Study:

  • To investigate how predation risk affects dispersal from aquatic habitats.
  • To determine if risk influences the movement of semi-aquatic insects between habitats.

Main Methods:

  • Conducted two experiments using caged fish (predators) and semi-aquatic insects (Notonecta undulata).
  • Exposed insects to non-lethal predation risk from fish fed conspecifics.
  • Measured dispersal rates in relation to varying levels of predation risk.

Main Results:

  • Exposure to caged fish significantly increased dispersal rates in Notonecta undulata.
  • Dispersal rate showed a positive correlation with the intensity of predation risk.
  • Higher conspecific consumption by fish led to greater insect dispersal.

Conclusions:

  • Habitat-specific predation risk can influence inter-habitat dispersal.
  • This risk-mediated dispersal can impact landscape-level community structure.
  • Predation risk has broader ecological consequences beyond direct mortality.