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Updated: May 12, 2025

The Joint Effect of Social Comparison and Social Distance on Evaluation of Intertemporal Choice Outcomes in Event-related Potential Studies
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Shared sinks alter competitive outcomes via edge effects.

Brian A Lerch1, Senay Yitbarek1, Samantha A Catella2

  • 1Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.

Ecology
|May 9, 2025
PubMed
Summary
This summary is machine-generated.

Shared sinks can enable a weaker competitor to exclude a superior one in metacommunities, altering competitive outcomes. This occurs when the benefit in the source region is outweighed by a greater cost in the shared sink.

Keywords:
Lotka‐Volterra competitionenvironmental heterogeneityhabitat qualitymetacommunitysource‐sink dynamicsspecialist‐generalist trade‐off

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Area of Science:

  • Ecology
  • Population Dynamics
  • Metacommunity Ecology

Background:

  • Metacommunity research often assumes distinct sources and sinks for competing species.
  • This study investigates scenarios with overlapping sources and sinks for competing species.

Purpose of the Study:

  • To explore how shared sources and sinks influence competitive exclusion in metacommunities.
  • To examine the impact of niche overlap on species coexistence and competitive dynamics.

Main Methods:

  • Utilized implicit-space two-patch models (ordinary differential equations).
  • Employed explicit-space reaction-diffusion models (partial differential equations).

Main Results:

  • Shared sinks can facilitate the exclusion of a superior competitor by an inferior one.
  • Competitive outcomes are reversed when species share sources and sinks, provided costs in sinks outweigh source benefits.
  • Edge effects at abrupt source-sink transitions alter competitive dynamics based on sink tolerance.

Conclusions:

  • Niche overlap and shared habitats significantly impact metacommunity dynamics and competitive outcomes.
  • Findings offer insights into species coexistence, trade-offs, and inform conservation and restoration strategies.