Dataset from an inventory of slime moulds (Eumycetozoa) in two forest nature reserves of the Masurian Lakeland, north‑eastern Poland

This dataset compiles statistical summaries from an inventory of slime moulds (Eumycetozoa) on tree-linked and litter-type substrates in two forest nature reserves of the Masurian Lakeland (north-eastern Poland). It includes substrate-level diversity metrics and species incidence totals, summaries by ecological substrate class, a richness–pH model, NMDS ordination scores, combined taxon–substrate records across both reserves, and soaking-water pH values from moist chamber cultures. Supplementary Material 1.1 provides substrate‑level alpha‑diversity metrics and species incidence totals. For each substrate code it reports species richness, Shannon diversity, the Gini–Simpson index and Pielou’s evenness, together with associated metadata on host tree, substrate material, ecological substrate class and, where available, mean pH of moist‑chamber soaking water. A second table lists every recorded taxon and its total number of collections across both reserves and all substrates. Supplementary Material 1.2 summarises richness and diversity by ecological substrate class and documents an exploratory non‑parametric comparison between lignicolous and non‑lignicolous substrates. One table gives, for each substrate class, the number of substrate codes and the mean and standard deviation of richness, Shannon diversity, Gini–Simpson index and evenness. A second table reports the Wilcoxon rank‑sum statistic, p‑value and test specification for the comparison of richness between substrates. Supplementary Material 1.3 contains parameter estimates from a univariate Gaussian linear model describing species richness as a function of mean substrate pH. Mean pH is represented as a categorical predictor with levels corresponding to the distinct pH values measured in moist‑chamber soaking water. The table lists, for the intercept and each pH level, the estimated coefficient, standard error, test statistic and p‑value. Supplementary Material 1.4 provides ordination scores for all substrate codes from a two‑dimensional non‑metric multidimensional scaling analysis based on Bray–Curtis dissimilarities of presence–absence data. For each substrate code the table reports NMDS coordinates on two axes together with metadata on host tree, substrate description, mean pH, tree and material codes and ecological substrate class, allowing reconstruction and ecological interpretation of the ordination. Supplementary Material 1.5 presents combined records of slime moulds (Eumycetozoa) from Dębowo and Gązwa by host tree and substrate type. For each taxon, it lists the number of collections on bark, wood, twigs, leaves/needles and seeds/cupules, plus BRY, FOL, HER and TER, providing the observed substrate associations. Supplementary Material 1.6 reports mean soaking-water pH from moist chamber cultures for substrates. Supplementary Material 1.7. records moist chamber cultures established from tree-linked substrates in Gązwa and Dębowo Nature Reserves本数据集汇编了波兰东北部马祖里湖区两处森林自然保护区内，附生林木基质与枯落物基质上的黏菌（Eumycetozoa）调查统计摘要。数据集涵盖基质水平多样性指标、物种发生总数、按生态基质类群汇总的统计结果、物种丰富度-pH模型、非度量多维标度（NMDS）排序得分、两处保护区内的类群-基质联合记录，以及保湿培养箱浸泡液的pH值。 补充材料1.1提供基质水平的α多样性指标与物种发生总数。针对每个基质编码，该材料报告了物种丰富度、香农多样性指数、基尼-辛普森指数以及皮卢均匀度，同时附带宿主树木、基质材质、生态基质类群等相关元数据，以及可获取的保湿培养箱浸泡液平均pH值。第二张表格列出了所有记录的类群，以及其在两处保护区所有基质中的总采集次数。 补充材料1.2按生态基质类群汇总了物种丰富度与多样性数据，并记录了木质基质与非木质基质之间的探索性非参数比较结果。第一张表格针对每个基质类群，给出了基质编码数量、丰富度、香农多样性指数、基尼-辛普森指数及均匀度的平均值与标准差。第二张表格报告了基质间丰富度比较的威尔科克森秩和检验统计量、p值及检验设定详情。 补充材料1.3包含基于单变量高斯线性模型的参数估计结果，该模型以基质平均pH为自变量预测物种丰富度。此处的平均pH被设置为分类预测变量，其水平对应保湿培养箱浸泡液中测得的不同pH值。表格列出了截距项与每个pH水平对应的估计系数、标准误、检验统计量及p值。 补充材料1.4提供了基于存在-缺失数据的布莱-柯蒂斯（Bray–Curtis）相异度进行二维非度量多维标度（NMDS）分析得到的所有基质编码的排序得分。针对每个基质编码，表格报告了其在两个轴上的NMDS坐标，以及宿主树木、基质描述、平均pH、树木与材质编码、生态基质类群等元数据，可用于排序结果的重建与生态学阐释。 补充材料1.5展示了来自登博沃（Dębowo）与加兹瓦（Gązwa）自然保护区的黏菌（Eumycetozoa）联合记录，按宿主树木与基质类型分类。针对每个类群，该材料列出了其在树皮、木材、细枝、叶片/针叶以及种子/壳斗上的采集次数，同时附带BRY、FOL、HER与TER编码，以呈现观测到的基质关联类型。 补充材料1.6报告了各基质的保湿培养箱浸泡液平均pH值。 补充材料1.7记录了来自加兹瓦与登博沃自然保护区附生林木基质的保湿培养箱培养物。