The importance of canopy complexity in shaping seasonal spider and beetle assemblages in saltmarsh habitats
The importance of canopy complexity in shaping seasonal spider and beetle assemblages in saltmarsh habitats
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树冠复杂性对于塑造盐沼栖息地季节性蜘蛛和甲虫组合的重要性
DOI：
10.1111/een.12373
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发表时间：
2016
影响因子：
2.2
通讯作者：
FORD H
中科院分区：
文献类型：
--
作者：
FORD H
1.生境结构，包括植被结构的复杂性，在很大程度上决定了无脊椎动物的组合在半自然草原。盐沼无脊椎动物群落的结构复杂性的重要性，其中植被特征和潮汐淹没之间的相互作用是关键，是鲜为人知的。据推测，树冠复杂性将是一个更重要的蜘蛛和甲虫组合比简单的植被属性（如高度，群落类型）和环境变量（如海拔）单独的预测，在两个盐沼地区，东南（埃塞克斯）和西北（莫雷坎贝湾）英国。冠层复杂性（冠层中≥ 1 mm宽的非植被“间隙”数量）使用侧面摄影进行评估。通过抽吸取样，冬、夏两季共采集蜘蛛和甲虫1500余只.在夏季，盐沼丰富的蜘蛛和甲虫种群的特点是高分数的冠层复杂性往往与丛生草或灌木覆盖。简单的植被属性（植物覆盖，高度）占蜘蛛丰度和蜘蛛多样性的变化的26%和14%，分别上升到46%和41%，加上冠层复杂性得分。越冬蜘蛛组合与海拔和植被生物量。海拔和植物物种丰富度最能解释夏甲虫的丰度，特别是捕食性和食虫性类群，以及多样性.夏季树冠复杂性被确定为盐沼蜘蛛群落（地面奔跑的猎人和床单编织者）的一个积极的栖息地特征，与更常见的测量植被结构属性相比具有显着的“附加值”。
1. Habitat structure, including vegetation structural complexity, largely determines invertebrate assemblages in semi‐natural grasslands. The importance of structural complexity to the saltmarsh invertebrate community, where the interplay between vegetation characteristics and tidal inundation is key, is less well known.2. It was hypothesised that canopy complexity would be a more important predictor of spider and beetle assemblages than simple vegetation attributes (e.g. height, community type) and environmental variables (e.g. elevation) alone, measured in two saltmarsh regions, south‐east (Essex) and north‐west (Morecambe Bay) U.K. Canopy complexity (number of non‐vegetated ‘gaps’ in canopy ≥ 1 mm wide) was assessed using side‐on photography. Over 1500 spiders and beetles were sampled via suction sampling, winter and summer combined.3. In summer, saltmarshes with abundant spider and beetle populations were characterised by high scores for canopy complexity often associated with tussocky grass or shrub cover. Simple vegetation attributes (plant cover, height) accounted for 26% of variation in spider abundance and 14% in spider diversity, rising to 46% and 41%, respectively, with the addition of canopy complexity score. Overwintering spider assemblages were associated with elevation and vegetation biomass. Summer beetle abundance, in particular the predatory and zoophagous group, and diversity were best explained by elevation and plant species richness.4. Summer canopy complexity was identified as a positive habitat feature for saltmarsh spider communities (ground‐running hunters and sheet weavers) with significant ‘added value’ over more commonly measured attributes of vegetation structure.
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DOI：
10.1002/0470011815.b2a15148
发表时间：
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影响因子：
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