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Resisting annihilation: relationships between functional trait dissimilarity, assemblage competitive power and

Rika M W Muhl1, Daniel L Roelke1,2, Tamar Zohary3

  • 1Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX, 77843-2258, USA.

Ecology Letters
|July 12, 2018
PubMed
Summary

Stronger competition within ecological assemblages increases resistance to invasive allelopathic species. Neutral assemblages are most vulnerable, while intransitive ones show the highest resistance to allelopathy.

Keywords:
Allelopathyexploitative competitioninterference competitionintransitivitylumpy coexistenceneutralityspecies supersaturated assemblages

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Area of Science:

  • Ecology
  • Community Ecology
  • Invasion Biology

Background:

  • Allelopathic species can significantly impact biodiversity by inhibiting the growth of other species.
  • Understanding the factors that confer resistance to allelopathy is crucial for predicting community dynamics.

Purpose of the Study:

  • To investigate the relationship between within-assemblage competitive dissimilarity and resistance to allelopathic species.
  • To model how different community structures (neutral, lumpy, intransitive) influence susceptibility to allelopathy.

Main Methods:

  • Utilized simulated ecological assemblages with varying competitive structures.
  • Analyzed real-world time-series data from eight lakes to validate modeling findings.

Main Results:

  • Assemblages with higher exploitative competition (stronger competitive power) exhibited greater resistance to allelopathic species.
  • Neutral assemblages were most vulnerable, followed by lumpy, and then intransitive assemblages.
  • Lake plankton assemblage structure correlated with historical allelopathic phytoplankton dominance, mirroring model predictions.

Conclusions:

  • An ecological assemblage's competitive power is a key determinant of its resistance to allelopathy.
  • Community structure plays a critical role in mediating the impact of invasive allelopathic species.