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The use of sentinel logs to assess host shifts in early beetle colonisers of deadwood under climate‐ and forestry‐induced tree species substitutions
Insect Conservation and Diversity ( IF 3.2 ) Pub Date : 2020-07-27 , DOI: 10.1111/icad.12434 Christophe Bouget 1 , Antoine Brin 2 , Laurent Larrieu 2, 3
中文翻译：
在气候和林业引起的树种替代下，使用前哨原木评估枯木的早期甲虫定居者的寄主转移
更新日期：2020-07-27
Insect Conservation and Diversity ( IF 3.2 ) Pub Date : 2020-07-27 , DOI: 10.1111/icad.12434 Christophe Bouget 1 , Antoine Brin 2 , Laurent Larrieu 2, 3
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- Global change scenarios project drastic modifications in tree species range and an increase in exotic tree plantations. Subsequent tree species substitutions may alter habitat conditions for biodiversity.
- We measured substitutability between tree species for early deadwood colonisers, through a sentinel log approach, i.e. through the experimental exposure of paired down deadwood (DDW) pieces to native beetles in native stands. We compared two native/substitute tree species pairs: one conifer pair composed of a rapidly expanding exotic species (Douglas fir) and a declining native species (silver fir), and one deciduous pair composed of two native species, one expanding (sessile oak) and one retreating (beech) at the regional scale.
- The effects of expanding exotic and native trees on beetle communities were not in line with expectations.
- Species assemblages in Douglas fir DDW were indistinguishable from those in native silver fir DDW and did not contain fewer species. Assemblages were not more generalist on average in substitutes than in substituted trees: we did not note any decrease in species richness of functional groups to the detriment of specialist species.
- Moreover, species richness and abundance were higher in substitute oak than in native beech DDW, confirming that species from the regional pool were able to colonise oak, even though it is a minor tree species at the regional level.
- Large‐scale monitoring schemes including multi‐taxon, multi‐year and multiple native/substitute pairs would further our knowledge of the generic effects of tree species substitution on biodiversity and ecosystem functioning.
中文翻译：
在气候和林业引起的树种替代下，使用前哨原木评估枯木的早期甲虫定居者的寄主转移
- 全球变化方案预测，树木种类将发生巨大变化，外来树种种植将增加。随后的树木替代可能会改变生物多样性的栖息地条件。
- 我们通过前哨对数方法，即通过配对成对的枯木（DDW）块暴露于天然林中的天然甲虫的实验，测量了早期枯木定居者的树种之间的可替代性。我们比较了两种原生/替代树木物种对：一对针叶树对（由迅速扩张的外来物种（道格拉斯冷杉）和数量递减的本土物种（银杉）组成）和一对落叶对（一对由两个原生物种组成的物种，一种正在扩张（无栎））还有一个在区域范围内撤退（山毛榉）。
- 扩大外来树种和本地树种对甲虫群落的影响与预期不符。
- 道格拉斯冷杉DDW中的物种集合与原生银冷杉DDW中的物种集合没有区别，并且没有更少的物种。替代品的组合平均而言没有替代树的通用性：我们没有注意到功能组的物种丰富度降低，这不利于专业树种。
- 此外，替代橡木的物种丰富度和丰度比本地山毛榉DDW高，这证实了即使在区域一级它是次要的树种，区域库中的物种也能够殖民橡木。
- 包括多个分类单元，多年和多个本地/替代对的大规模监测计划将使我们进一步了解树种替代对生物多样性和生态系统功能的一般影响。
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