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Size-Mediated Trophic Interactions in Two Syntopic Forest Salamanders.

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Summary

Interference competition between forest salamanders Speleomantes strinatii and Salamandrina perspicillata affects foraging. Larger S. perspicillata experienced reduced foraging success when competitors were active, indicating size-mediated interference.

Keywords:
competitiondietforaginginterference competitionsalamanderspecies interaction

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Area of Science:

  • Ecology
  • Animal Behavior
  • Interspecific Competition

Background:

  • Competition is a key ecological interaction influencing species coexistence and community structure.
  • Exploitative competition reduces resource availability, while interference competition involves direct antagonistic interactions.
  • Understanding these dynamics is crucial for predicting species distributions and conservation strategies.

Purpose of the Study:

  • To investigate foraging competition between two sympatric forest-dwelling salamander species in Italy: Speleomantes strinatii and Salamandrina perspicillata.
  • To determine if competition is size-mediated and identify the type of competition (exploitative vs. interference).

Main Methods:

  • Stomach content analysis of 191 individuals from 8 shared habitats using stomach flushing.
  • Focus on shared prey taxa: Collembola and Acarina.
  • Statistical analysis to assess the influence of body size and competitor activity on foraging success.

Main Results:

  • Foraging activity of Salamandrina perspicillata was positively influenced by body size.
  • Competitor activity on the forest floor negatively impacted S. perspicillata foraging.
  • The positive relationship between body size and foraging was weakened by competitor presence, suggesting interference competition.

Conclusions:

  • The study provides evidence for interference competition between Speleomantes strinatii and Salamandrina perspicillata.
  • Competition is size-mediated, with larger S. perspicillata being more affected by the presence and activity of S. strinatii.
  • These findings highlight the complex interactions shaping amphibian communities and resource use.