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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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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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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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Visually Sexing Loggerhead Shrike Lanius Ludovicianus Using Plumage Coloration and Pattern
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Density dependent effects between three competitive bird species.

L Sasvári1, J Török2, L Tóth1

  • 1Department of General Zoology, Eötvös University, Puskin u. 3, 1088, Budapest, Hungary.

Oecologia
|March 18, 2017
PubMed
Summary
This summary is machine-generated.

Bird species competition impacts breeding success. High densities of blue tits (Parus caeruleus) and great tits (Parus major) negatively affected clutch size, while collared flycatchers (Ficedula albicollis) reduced hatching success.

Keywords:
BirdsInterspecific competitionIntraspecific competition

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Area of Science:

  • Avian ecology
  • Population dynamics
  • Interspecific competition

Background:

  • Understanding density-dependent effects is crucial for avian population management.
  • Competition dynamics between closely related species can significantly influence breeding outcomes.
  • Oak forest ecosystems support diverse bird communities with complex interactions.

Purpose of the Study:

  • To investigate the long-term (19-year) effects of intraspecific and interspecific density on breeding success in three sympatric bird species.
  • To determine how the presence of a dominant competitor (collared flycatcher) alters competitive interactions between two tit species.
  • To analyze the reciprocal effects of tit species density on the breeding success of the collared flycatcher.

Main Methods:

  • Long-term monitoring of a nest box colony over 19 years.
  • Quantifying population densities of great tit (Parus major), blue tit (Parus caeruleus), and collared flycatcher (Ficedula albicollis).
  • Analyzing clutch size, hatching success, and fledgling numbers in relation to species densities.

Main Results:

  • Intraspecific density-dependent clutch size reduction observed in blue and great tits.
  • High blue tit density negatively impacted great tit clutch size.
  • Collared flycatchers significantly reduced hatching success and fledgling numbers of both tit species.
  • High densities of great tits and combined tit species negatively affected collared flycatcher hatching success and fledgling numbers.

Conclusions:

  • Interspecific competition significantly alters breeding success dynamics in this avian community.
  • The presence of the collared flycatcher reshapes competitive interactions between tit species.
  • Density-dependent effects are complex and vary based on species identity and density levels.