Interspecific dispersal constraints suppress pattern formation in metacommunities.

Area of Science:

• Ecology
• Theoretical Ecology
• Spatial Ecology

Background:

• Dispersal is a key driver of ecosystem dynamics, influencing species distribution and abundance.
• Metacommunity models traditionally focus on intraspecific density, often overlooking interspecific interactions in dispersal decisions.
• Interspecific encounters during dispersal, such as resource tracking or predator avoidance, shape spatial patterns.

Purpose of the Study:

• To investigate how interspecific dispersal rules influence metacommunity spatial patterns.
• To determine the impact of adaptive behaviors (prey tracking, predator avoidance) on spatial pattern formation.
• To explore the role of food web complexity in modulating the effects of adaptive dispersal.

Main Methods:

• Analysis of three-species network motifs to understand basic interaction dynamics.
• Computation of master stability functions to differentiate local and spatial interaction contributions.
• Application of a random matrix approach to extend findings to complex food webs.

Main Results:

• Interspecific dispersal rules generally promote heterogeneous spatial patterns in metacommunities.
• Adaptive behaviors like predator avoidance exert a strong homogenizing effect, suppressing spatial pattern formation.
• In large, species-rich food webs, the homogenizing effect of adaptive dispersal is overridden, leading to pattern formation.

Conclusions:

• Interspecific dispersal rules are critical for shaping spatial patterns across landscapes.
• Adaptive behavioral constraints must be incorporated into models to accurately link local interactions and metacommunity structure.
• The complexity of ecological networks influences the balance between pattern formation and homogenization driven by dispersal.