By-catches from bark beetle monitoring in 2013 and 2014

From June to October 2013 and from April to September 2014, a book printer monitoring with 20 pheromone traps (slit traps) was carried out by the University of Natural Resources at Gesäuse National Park southwest of Hieflau. In the present project, the by-catches from these traps were evaluated, as they provide valuable information about the organismic diversity of the sampled forest sites and can provide indications of dynamic processes in and outside of beetle areas.From samples, beetles (Coleoptera), bedbugs (Hepteroptera), cicadas (Auchenorrhyncha), spiders (Araneae) and weavers (Opiliones) were sorted and processed. In comparison with the years, the populations of the beetles and bedbugs, which specialise in bark beetles found in 2013, have been observed reduced by 30-40 % in 2014. Species numbers in the second year of study were slightly increased for beetles (146-164) and spiders (16-21) in comparison, remaining for bedbugs (35-32) and falling in cicadas (16-6). The bulk of the species is euryök and is considered approximate, although individual spectacular evidence (highly endangered species, rare species, jungle relic species) can also be found again and again. From June to October 2013 and from April to September 2014, a book printer monitoring with 20 pheromone traps (slit traps) was carried out by the University of Natural Resources at Gesäuse National Park southwest of Hieflau. In the present project, the by-catches from these traps were evaluated, as they provide valuable information about the organismic diversity of the sampled forest sites and can provide indications of dynamic processes in and outside of beetle areas. From samples, beetles (Coleoptera), bedbugs (Hepteroptera), cicadas (Auchenorrhyncha), spiders (Araneae) and weavers (Opiliones) were sorted and processed. In comparison with the years, the populations of the beetles and bedbugs, which specialise in bark beetles found in 2013, have been observed reduced by 30-40 % in 2014. Species numbers in the second year of study were slightly increased for beetles (146-164) and spiders (16-21) in comparison, remaining for bedbugs (35-32) and falling in cicadas (16-6). The bulk of the species is euryök and is considered approximate, although individual spectacular evidence (highly endangered species, rare species, jungle relic species) can also be found again and again.2013年6月至10月、2014年4月至9月，自然资源大学（University of Natural Resources）在希夫劳西南侧的格塞厄国家公园（Gesäuse National Park）开展了小蠹虫监测工作，共布设20台信息素诱捕器（slit traps，狭缝式诱捕器）。本项目对这些诱捕器的副捕获物（by-catches）进行了评估，因其可为所采样森林样地的生物多样性提供宝贵数据，并能反映甲虫类群分布区内外的动态过程。研究人员对采集样本中的鞘翅目（Coleoptera）甲虫、半翅目（Hepteroptera）椿象、头喙亚目（Auchenorrhyncha）蝉类、蜘蛛目（Araneae）蜘蛛以及盲蛛目（Opiliones）盲蛛进行了分拣与处理。相较于2013年，2014年专食小蠹虫（bark beetles）的甲虫与椿象种群数量下降了30%~40%。本研究第二年的物种种数方面，甲虫（146~164种）与蜘蛛（16~21种）略有增加，椿象（35~32种）基本持平，蝉类（16~6种）则出现明显下降。绝大多数物种为广栖性（euryök）类群，相关统计数据近似可靠，但仍可多次观测到珍稀类群的记录，包括极危物种、稀有物种以及丛林孑遗物种（jungle relic species）。