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Experimental Analysis of Interactions Among Saprotrophic Fungi from A Phosphorous-Poor Desert Oasis in the Chihuahuan Desert

Mycobiology 2020년 48권 5호 p.410 ~ 417
Marini-Macouzet Constanza, Munoz Luis, Gonzalez-Rubio Aldo, Eguiarte Luis E.,
소속 상세정보
 ( Marini-Macouzet Constanza ) - Universidad Nacional Autonoma de Mexico Instituto de Ecologia Departamento de Ecologia Evolutiva
 ( Munoz Luis ) - Universidad Nacional Autonoma de Mexico Instituto de Ecologia Departamento de Ecologia Evolutiva
 ( Gonzalez-Rubio Aldo ) - Universidad Nacional Autonoma de Mexico Instituto de Ecologia Departamento de Ecologia Evolutiva
 ( Eguiarte Luis E. ) - Universidad Nacional Autonoma de Mexico Instituto de Ecologia Departamento de Ecologia Evolutiva

Abstract


Fungal ecological interactions play a key role in structuring community assemblages. These associations may involve both antagonistic and synergistic relationships, which are commonly influenced by abiotic factors such as nutrient conditions. However, information for extreme, oligotrophic systems remain poor. Herein, interactions among key members of the aquatic transient fungal community (Aspergillus niger, Cladosporium sp., and Coprinellus micaceus) of a low-nutrient freshwater system in the Cuatro Cienegas Basin, Mexico were studied. Pairwise interaction bioassays were explored in vitro under different nutrient conditions, including carbohydrates-rich, carbohydrates and amino peptides-rich, and low nutrients. Our results indicated that antagonistic patterns prevail among the studied taxa. However, nutrient-dependent changes were observed in Cladosporium sp. shifting to synergy under carbohydrates-rich conditions, suggesting changes in the fungal community composition as a result of nutrient enrichment. Remarkably, our findings contrast with previous work demonstrating mainly synergistic interactions between our tested fungal isolates and co-occurring autochthonous bacteria (Aeromonas spp. and Vibrio sp.) under low-nutrient conditions. This observation may indicate that bacteria and fungi exhibit distinct community-level responses, driven by nutrient conditions. This contributes to the knowledge of fungal community dynamics and interspecific interactions in an oligotrophic ecosystem, highlighting the relevance of nutrient-based shifts and antagonistic interactions in ecosystem dynamics.

키워드

Arid ecosystem; ecosystem dynamics; fungus?fungus interaction; inhibition index

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