Effects of macro and micro-environmental factors on the species richness of terrestrial tardigrade assemblages in an Iberian mountain environment
Effects of macro and micro-environmental factors on the species richness of terrestrial tardigrade assemblages in an Iberian mountain environment
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DOI：
10.1007/s10980-008-9312-x
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发表时间：
2009-03
影响因子：
5.2
通讯作者：
N. Guil;J. Hortal;S. Sánchez-Moreno;A. Machordom
中科院分区：
文献类型：
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作者：
N. Guil;J. Hortal;S. Sánchez-Moreno;A. Machordom
迟滞群落受到微观和宏观环境条件的影响，但只受微观环境变量的影响，并对海拔梯度进行了研究。我们回顾了以前关于海拔效应的报道，并通过宏观(气候、土壤、生物群和其他)和微观环境(植被、苔藓和树叶凋落物)因素的相互作用，评估了对西班牙伊比利亚中央系统山脉(Sierra De Guadarrama Mountain)迟滞组合的影响。使用标准岩心采集陆相迟滞组合，以收集落叶和生长在岩石上的苔藓。用一般线性模型检验了缓步动物物种丰富度和丰度与宏观和微观环境变量(海拔、生境特征、当地生境结构和优势凋落物类型以及两种生物气候分类)之间的关系。利用变异划分技术分离海拔和生境变化的影响，并量化气候和土壤、植被结构和凋落物优势类型的独立影响。海拔高度与迟滞物种丰富度呈单峰关系，但与生境变化无关的影响可以忽略不计。生物气候分类对物种丰富度的预测效果最好。宏观环境梯度(土壤和气候)、植被结构和落叶类型的单独和综合影响是丰富度的重要决定因素。一个同时包括宏观和微观环境变量的模型解释了微观样地中近60%的迟滞物种丰富度。丰度只与土壤组成和凋落物类型显著相关。迟滞丰度不能用这里分析的宏观环境梯度来解释，尽管丰度和丰富度之间存在显著的相关性。
Tardigrade communities are affected by micro and macro-environmental conditions but only micro-environmental variables, and altitudinal gradients have been studied. We review previous reports of altitudinal effects and evaluate the influence by interacting macro- (climate, soils, biome, and others) and micro-environmental (vegetation, moss and leaf litter) factors on tardigrade assemblages at the Sierra de Guadarrama mountain range (Iberian Central System Mountains, Spain). Terrestrial tardigrade assemblages were sampled using standard cores to collect leaf litter and mosses growing on rocks. General Linear Models were used to examine relationships between Tardigrada species richness and abundance, and macro- and micro-environmental variables (altitude, habitat characteristics, local habitat structure and dominant leaf litter type, and two bioclimatic classifications). Variation partitioning techniques were used to separate the effects of altitude and habitat variation, and to quantify the independent influences of climate and soil, vegetation structure and dominant type of leaf litter. Altitude shows a unimodal relationship with tardigrade species richness, although its effect independent of habitat variation is negligible. The best predictors for species richness were bioclimatic classifications. Separate and combined effects of macro-environmental gradients (soil and climate), vegetation structure and leaf litter type are important determinants of richness. A model including both macro- and micro-environmental variables explained nearly 60% of tardigrade species richness in micro-scale plots. Abundance was significantly related only to soil composition and leaf litter type. Tardigrade abundance was not explained by macro-environmental gradients analysed here, despite a significant correlation between abundance and richness.