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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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Taxonomy is the science of defining and naming groups of biological organisms based on shared characteristics. It uses a hierarchy of increasingly inclusive categories with Latin names. The smallest units of taxonomy, species and genus, are used to assign a formal, taxonomic name to each species in a system. This classification system, referred to as binomial nomenclature, was formalized by Carolus Linnaeus in the 18th century.
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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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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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Pest categorisation of Malacosoma parallela.

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    The mountain ring silk moth (Malacosoma parallela) is a potential EU quarantine pest. Its introduction could damage deciduous trees and shrubs, necessitating phytosanitary measures for prevention.

    Keywords:
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    Area of Science:

    • Plant Health
    • Entomology
    • Pest Risk Assessment

    Background:

    • Malacosoma parallela, the mountain ring silk moth, is a polyphagous pest from West-Central Asia.
    • It primarily feeds on deciduous trees and shrubs, including Malus, Prunus, and Quercus species, causing significant damage.

    Purpose of the Study:

    • To perform a pest categorization of Malacosoma parallela for the European Union.
    • To assess the potential risk posed by M. parallela, identified during risk assessments of plants for planting from Türkiye.

    Main Methods:

    • Conducted a pest categorization following commodity risk assessments.
    • Evaluated host availability, climate suitability, and potential pathways for introduction and spread within the EU.

    Main Results:

    • Malacosoma parallela is a univoltine species with larvae feeding on buds and leaves, capable of complete defoliation.
    • Plants for planting infested with egg masses represent a primary pathway for introduction and spread.
    • Parts of the EU show suitable climate and host availability for establishment.

    Conclusions:

    • The introduction of Malacosoma parallela could lead to outbreaks and damage to EU forests and orchards.
    • The species satisfies criteria to be considered a potential Union quarantine pest.
    • Phytosanitary measures are available to mitigate the entry and spread of M. parallela.