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Related Concept Videos

Types of Selection01:46

Types of Selection

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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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Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the...
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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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Symbiosis00:58

Symbiosis

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Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
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Competition

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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.
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Frequency-dependent Selection01:21

Frequency-dependent Selection

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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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Competitive interactions between parasitoids provide new insight into host suppression.

Hai-Yun Xu1, Nian-Wan Yang, Fang-Hao Wan

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Competition between parasitoid species, Eretmocerus hayati and Encarsia sophia, negatively impacts progeny production and Bemisia tabaci suppression. Understanding these dynamics is key for effective biological control strategies.

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Area of Science:

  • Biological Control
  • Insect Ecology
  • Pest Management

Background:

  • Parasitoid communities are vital for biological control of pests like Bemisia tabaci.
  • Understanding inter- and intraspecific competition is crucial for selecting effective parasitoid combinations.
  • The interaction between exotic (Eretmocerus hayati) and existing (Encarsia sophia) parasitoids warrants investigation.

Purpose of the Study:

  • To investigate interference competition between Eretmocerus hayati and Encarsia sophia.
  • To assess the impact of this competition on Bemisia tabaci suppression.
  • To evaluate competition under varying host resource conditions.

Main Methods:

  • Laboratory studies of host-parasitoid systems (Bemisia tabaci, Eretmocerus hayati, Encarsia sophia).
  • Analysis of interspecific, intraspecific, and self-interference competition.
  • Experiments conducted under rich and limited host resource conditions.

Main Results:

  • Both parasitoid species negatively impacted each other's progeny production regardless of host availability.
  • Intraspecific interference occurred when hosts were scarce.
  • Parasitoid-induced mortality of Bemisia tabaci varied, showing potential for optimized control.

Conclusions:

  • Interspecific competition between Eretmocerus hayati and Encarsia sophia affects parasitoid success and host suppression.
  • Further research on multi-generational interactions is recommended for refining biological control strategies.