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Symbiosis00:58

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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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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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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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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
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More Is Not Always Better: Coinfections with Defensive Symbionts Generate Highly Variable Outcomes.

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Coinfections with pea aphid symbionts (heritable facultative symbionts) yield variable defense and fitness outcomes. Combinations can lessen costs but don't create generalist "Swiss army knife" aphids.

Keywords:
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Area of Science:

  • Microbial Ecology
  • Symbiosis Research
  • Insect-Host Interactions

Background:

  • Animal-associated microbes significantly influence host phenotypes and fitness.
  • Pea aphids (Acyrthosiphon pisum) host heritable facultative symbionts (HFS) providing defense against natural enemies.
  • Aphids frequently harbor multiple HFS, leading to complex interactions beyond single-infection studies.

Purpose of the Study:

  • To investigate the fitness and defense consequences of single versus coinfection with two common HFS: Hamiltonella defensa (antiparasitoid) and Regiella insecticola (antipathogen).
  • To evaluate these interactions across different pea aphid genotypes and environments.

Main Methods:

  • Experimental manipulation of single infections and coinfections with H. defensa and R. insecticola in pea aphids.
  • Assessment of aphid defense against specific enemies (parasitoids and pathogens).
  • Measurement of aphid fitness (survival and reproduction) under varying environmental conditions and enemy presence.

Main Results:

  • Single infections conferred specific defenses, but H. defensa reduced aphid fitness without enemy presence.
  • Coinfections showed variable outcomes: R. insecticola ameliorated H. defensa costs but weakened its antiparasitoid defense.
  • H. defensa negated survival benefits from R. insecticola against pathogens, likely due to symbiont costs rather than reduced defense.

Conclusions:

  • Coinfection outcomes are complex and not simply additive; they can mitigate symbiont-imposed costs.
  • The defensive services and fitness impacts of HFS coinfections are highly context-dependent.
  • Observed patterns of HFS coinfections in nature may be influenced by these complex interactions and cost-benefit trade-offs.