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Facilitation May Buffer Competitive Effects: Indirect and Diffuse Interactions among Salt Marsh Plants.

Ragan M Callaway, Steven C Pennings

The American Naturalist

|March 30, 2018

Summary

In salt marsh plant communities, Monanthechloe littoralis outcompetes other species, but Arthrocnemum subterminale can buffer these negative effects, highlighting plant interdependence.

Keywords:

competition diffuse interactions facilitation indirect interactions positive interactions salt marsh

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Area of Science:

Ecology
Plant Community Dynamics
Interspecific Interactions

Background:

Plant interactions are complex, influenced by direct competition and indirect community effects.
Salt marsh ecosystems exhibit dynamic species composition influenced by competitive and facilitative interactions.

Purpose of the Study:

To investigate the direct and indirect effects of Monanthechloe littoralis and Arthrocnemum subterminale on other salt marsh plants.
To understand how these interactions shape plant community structure in a California salt marsh.

Main Methods:

Field experiments were conducted in permanent plots within a salt marsh.
Direct and combined effects of M. littoralis and A. subterminale on winter annuals and Limonium californicum were assessed.

Main Results:

Monanthechloe littoralis strongly suppressed Arthrocnemum subterminale and other resident species.
Arthrocnemum subterminale directly facilitated some annuals but competed with others.
Arthrocnemum subterminale ameliorated the negative impacts of Monanthechloe littoralis on multiple species.

Conclusions:

Arthrocnemum subterminale acts as a crucial buffer, mitigating competitive exclusion by Monanthechloe littoralis.
Plant community functioning depends on a balance of direct and diffuse interactions, emphasizing species interdependence.