Ecosystem engineering by leaf-rolling mites enhances arthropod diversity

Area of Science:

• Ecology
• Arthropod Ecology
• Ecosystem Engineering

Background:

• Arthropods often modify plant structures, creating habitats used by other species.
• Leaf-rolling mites are known to alter plant tissues, but their role in structuring broader arthropod communities is underexplored.
• Understanding these indirect interactions is key to comprehending forest ecosystem dynamics.

Purpose of the Study:

• To investigate the influence of leaf-rolling mites on arthropod communities in a tropical rainforest.
• To determine if mite-modified leaves (rolled leaves) support greater arthropod species richness, abundance, and colonization than unmodified leaves (expanded leaves).
• To assess the role of rolled leaves as shelter and nesting sites for arthropods, especially ants.

Main Methods:

• Field sampling in a Mexican tropical rainforest during June 2019.
• Collection of 150 leaves (75 rolled, 75 expanded) from 15 Amphitecna tuxtlensis trees.
• Enumeration and identification of all arthropods found on sampled leaves.

Main Results:

• A total of 1421 arthropods from 67 morphospecies were recorded.
• Rolled leaves harbored significantly more arthropods (1382 individuals, 56 morphospecies) compared to expanded leaves (39 individuals, 23 morphospecies).
• Ants were the most abundant group in rolled leaves, utilizing them as nesting sites (1260 individuals from 3 species).

Conclusions:

• Leaf-rolling mites act as ecosystem engineers by creating valuable shelter and nesting sites.
• Mite-induced leaf modifications enhance arthropod species richness, abundance, and colonization frequency.
• This interaction significantly structures arthropod communities, increasing biodiversity on host plants.