Material Suplementar. Matas ripárias do Cerrado sob intensa fragmentação apresentam alta diversidade, porém baixa similaridade de espécies

The riparian vegetation of the Meia Ponte River basin, in the southern Goiás Cerrado, is undergoing continuous fragmentation and environmental isolation. This process threatens local biodiversity and exacerbates the water crisis, prompting this investigation into the association between phytosociological, taxonomic, and floristic diversity patterns and the degradation of riparian communities in the Lower Meia Ponte sub-region. We analyzed 32 transects (20m x 4m) in the riparian vegetation of four watercourses, using diversity indices and morphological analyses for taxonomic identification. A total of 152 species (57 families) were identified, with the highest richness found in the Bom Jardim Stream. The Shannon index (H') indicated higher floristic complexity in the Formiga Stream (H'=3.32) and Bom Jardim Stream (H'=2.38). Evenness was higher in the Congo Stream (J'=0.81) and lower in the Serra Stream (J'=0.50), a pattern also observed in the Jentsch's Mixing coefficient. Floristic similarity ranged from 17% to 22%. The observed floristic heterogeneity, with high species richness and variability, indicates an association between species distribution and anthropogenic impacts. This association may result in biodiversity loss and a worsening water crisis in the Meia Ponte River basin.

位于戈亚斯州南部塞拉多（Cerrado）生态区的梅亚蓬蒂河（Meia Ponte River）流域河岸植被正经历持续的片段化与生境隔离过程。该过程不仅威胁当地生物多样性，还加剧了水资源危机，由此推动本研究聚焦下梅亚蓬蒂亚区河岸群落退化与植物社会学、分类学及区系多样性格局之间的关联。本研究针对四条水道的河岸植被布设了32条20米×4米的样带，并通过多样性指数与形态学分析完成物种分类鉴定。本次研究共计鉴定出152种植物，隶属于57个科，其中邦雅尔丁溪（Bom Jardim Stream）的物种丰富度最高。香农多样性指数（Shannon index，H'）结果显示，福尔米加溪（Formiga Stream，H'=3.32）与邦雅尔丁溪的区系复杂度更高，二者指数分别为3.32与2.38。均匀度指数（Evenness，J'）在刚果溪（Congo Stream，J'=0.81）中更高，在塞拉溪（Serra Stream，J'=0.50）中更低，这一格局与詹茨混合系数（Jentsch's Mixing coefficient）的分析结果一致。各水道间的区系相似性系数介于17%至22%之间。本研究观测到的区系异质性特征（伴随高物种丰富度与变异度）表明，物种分布格局与人为干扰活动存在显著关联。这种关联或导致梅亚蓬蒂河流域生物多样性丧失，同时加剧当地的水资源危机。