Tree selection by the endangered beetle Rosalia alpina in a lapsed pollard beech forest
Tree selection by the endangered beetle Rosalia alpina in a lapsed pollard beech forest
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DOI：
10.1007/s10841-016-9854-1
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发表时间：
2016-04-01
影响因子：
1.9
通讯作者：
Fernandez, Jon
中科院分区：
文献类型：
--
作者：
Castro, Alberto;Fernandez, Jon
被遗弃的截顶山毛榉林是特殊的生境，可能需要特别的保护努力，以保护濒危甲虫罗萨利亚alpina，一个模式物种，其保护可能使许多其他物种的栖息地永久化。森林利用方式决定了林木选择和种群大小。alpina，变量以前没有研究过在截头森林。选定的树木性状和人口规模，表明存在的成年标本和最近的出口孔，确定在一个截头山毛榉森林的栖息地操作，以保护物种的实施之前。多变量分析表明，树的条件（生活，障碍，下跌）和清除大小和方面的影响变量，前者解释更多的方差比后者。R.阿尔卑斯山积极选择位于大而干燥的空地上的截头障碍物和树木，避免那些在小空地或阴影区。障碍显示大多数成年人（90%）和最近出现的洞（84%）。距离最近的占用树，树干直径，树皮厚度和是否有汁液泄漏的发生没有影响R。阿尔卑斯山。种群规模估计为0.1个个体/天/公顷，38%的可用栖息地树木显示出出口洞，低于在其他欧洲国家观察到的数值。这些结果表明，有必要开始在森林中重新截头，以延长截头站的生活，并提高阳光照射。建议首先采取的措施是确定截桩障碍物和清除周围的植被，以有利于R。高山种群的截顶与封闭的树冠。
Abandoned pollard beech forests are particular habitats that may require special conservation efforts to preserve the endangered beetle Rosalia alpina, a model species whose protection may perpetuate the habitat of many other saproxylic species. Forest use can determine the tree selection and population size of R. alpina, variables previously not researched in pollard forests. Selected tree traits and population size, indicated by presence of adult specimens and recent exit holes, were determined in a pollard beech forest before the implementation of habitat manipulations targeted to preserve the species. Multivariate analysis showed tree condition (living, snag, fallen) and clearing size and aspect as influential variables, with the former explaining more variance than the latter. R. alpina positively selected pollard snags and trees located in big and dry clearings, avoiding those in small clearings or shaded areas. Snags showed most adults (90 %) and recent emergence holes (84 %). Distance to the nearest occupied tree, trunk diameter, bark thickness and presence of sap leaks had no effect on the occurrence of R. alpina. Population size was estimated in 0.1 individuals day(-1) ha(-1), and 38 % of available habitat trees showed exit holes, values lower than those observed in other European countries. These results show the need to start re-pollardings in the forest to extend pollard standing life and enhance exposure to sunlight. Pinpointing pollard snags and clearing the surrounding vegetation are recommended as the first measures to be taken in order to favor R. alpina populations on pollard stands with closed canopies.