Local and Geographic Factors Shape the Occupancy-Frequency Distribution of Freshwater Bacteria

Autor(es)

Mateus-Barros, Erick ^{[1, 2]} ; de Melo, Michaela L. ^{[3, 1]} ; Bagatini, Inessa L. ^[4] ; Caliman, Adriano ^[5] ; Sarmento, Hugo ^[1]

Afiliação do(s) autor(es)

^[1] Fed Univ Sao Carlos UFSCar, Dept Hydrobiol, Lab Microbial Proc & Biodivers, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Post Grad Program Ecol & Nat Resources PPG ERN, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Quebec Montreal, Dept Sci Biol, Montreal, PQ - Canada

^[4] Fed Univ Sao Carlos UFSCar, Dept Bot, Lab Phycol, BR-13565905 Sao Carlos, SP - Brazil

^[5] Univ Fed Rio Grande do Norte, Dept Ecol, BR-59078900 Natal, RN - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MICROBIAL ECOLOGY; v. 81, n. 1 JUL 2020.
• Citações Web of Science: 0

Resumo

Species prevalence across the landscape is related to their local abundance, which is a result of deterministic and stochastic processes that select organisms capable of recolonizing sites where they were once extinct, a process known as the rescue effect. The occupancy-frequency distribution (OFD) describes these patterns and has been extensively used to understand organism's distribution but has been poorly tested on microorganisms. In order to test OFD on freshwater bacteria, we collected data from 60 shallow lakes distributed across a wide area in southeastern Brazil, to determine the bacterial operational taxonomic units (OTUs) that were present in all sites (core) and at only one site (satellite). Then, we analyzed the spatial abundance distributions of individual OTUs to understand the influence of local abundances on regional occupancy patterns. Finally, we tested the environmental factors that influenced occupancy and abundance. We found a significant bimodal OFD for freshwater bacteria using both OTUs (97% clustering) and amplicon sequence variants (ASVs, unique sequences), with 13 core OTUs and 1169 satellite OTUs, but only three core ASVs. Core organisms had a bimodal or gamma abundance distribution. The main driver of the core community was pH, while nutrients were key when the core community was excluded and the rest of the community (mild and satellitetaxa) was considered. This study demonstrates the close relationship between local environmental conditions and the abundance and dispersion of microorganisms, which shapes their distribution across the landscape. (AU)

• Processo FAPESP: 11/50054-4 - Biodiversidade de microalgas de água doce: banco de germoplasma e obtenção de marcadores moleculares das espécies criopreservadas
• Beneficiário: Armando Augusto Henriques Vieira
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 14/14139-3 - Biodiversidade e processos microbianos em ecossistemas aquáticos
• Beneficiário: Hugo Miguel Preto de Morais Sarmento
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores