Structural elements enhanced by retention forestry promote forest and non-forest specialist bees and wasps

Rappa, Nolan J.; Staab, Michael; Ruppert, Laura-Sophia; Frey, Julian; Bauhus, Jürgen; Klein, Alexandra‐Maria

doi:10.1016/j.foreco.2022.120709

Cited by 9 publications

(22 citation statements)

References 101 publications

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“…Variables characterising the environment were chosen based on their potential influence on feeding and nesting resources of cavity-nesting bees and wasps, following Rappa et al (2023). Deciduous tree share (proportion of deciduous tree species), elevation and diameter at breast height of standing and lying deadwood pieces above 7 cm in diameter were obtained during full plot-level inventories conducted in 2017 and 2018.…”

Section: Forest Structural Elements and Environmental Variablesmentioning

confidence: 99%

“…Individuals who could not be identified at species level ($8% of host cells, $12% of parasitised cells) were excluded before analyses. Following identification, species were categorised according to habitat specialisation as forest and non-forest specialists (hosts) (Rappa et al, 2023) and according to host specificity as general and specific (parasitoids). More detailed information regarding trap construction, and insect identification and categorisation can be found in Supporting Information.…”

Section: Insect Collection Identification and Categorisationmentioning

confidence: 99%

“…Retention forestry emphasises maintaining forest habitat structural elements that would have been removed during timber harvest as a result of traditional management practices (e.g., deadwood removal) (Storch et al, 2020). Unique forest structural elements such as deadwood are important components of forest habitats and can have important influences on parasitism networks via the abundance and species richness of their potential hosts (Eckerter et al, 2021; Rappa et al, 2023), feeding resources (Heimpel, 2019) and microclimates (Laliberté & Tylianakis, 2010). Thus, understanding the potential effects of retention forestry on parasitism via the arrangement of forest habitat structural elements will provide valuable insights into the maintenance of this important ecosystem function (Baho et al, 2017; Holling, 1973).…”

Section: Introductionmentioning

confidence: 99%

“…Cavity‐nesting bees and wasps locate hollow cavities in deadwood or soil exposures and provision resources in a series of cells for their offspring. In forests, cavity‐nesting bees and wasps are considered secondary saproxylics, nesting in the deadwood exit holes created by primary saproxylic organisms (Westerfelt et al, 2015), and can thus be useful indicators of forest structure (Eckerter et al, 2021, Rappa et al, 2023). During nest building, or following nest completion, parasitoid species exploit the opportunity to lay their eggs on the resources provisioned and on/within the host egg or larvae.…”

Section: Introductionmentioning

confidence: 99%

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Forest structure and heterogeneity increase diversity and alter composition of host–parasitoid networks

Rappa,

Staab,

Ruppert

et al. 2024

Ecological Entomology

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Antagonistic host–parasitoid interactions can be quantified using bipartite and metanetworks, which have the potential to reveal how habitat structural elements relate to this important ecosystem function. Here, we analysed the host–parasitoid interactions of cavity‐nesting bees and wasps, as well as their abundance, diversity and species richness with forest structural elements from 127 forest research plots in southwestern Germany. We found that parasitoid abundance, diversity and species richness all increase with host abundance, a potential mediator between parasitoids and forest structure. Both parasitoid abundance and diversity increased with stand structural complexity, possibly mediated by the abundance of hosts. In addition, parasitoid abundance increased with increasing standing deadwood and herb cover. The bipartite networks of host–parasitoid interactions showed higher connectance with increasing standing deadwood, herb cover and host abundance. Analyses of interactions within the host–parasitoid metanetwork revealed that increasing host abundance and decreasing canopy cover diversify the suites of interactions present at the plot level. These results demonstrate that forest structural elements can improve the stability and resilience of host–parasitoid networks by promoting parasitoids and diversifying interactions in ecological networks.

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Section: Forest Structural Elements and Environmental Variablesmentioning

confidence: 99%

Section: Insect Collection Identification and Categorisationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Forest structure and heterogeneity increase diversity and alter composition of host–parasitoid networks

Rappa,

Staab,

Ruppert

et al. 2024

Ecological Entomology

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“…Recent approaches such as retention forestry aim to integrate timber production and conservation of biodiversity through retaining valuable old growth features like habitat trees and deadwood (Lindenmayer et al 2012, Gustafsson et al 2020). Evaluating the response of different faunistic groups to retention practices is a current topic in forest ecological research (Basile et al 2019, Franklin et al 2019, Storch et al 2020, Hendel et al 2023, Rappa et al 2023).…”

Section: Introductionmentioning

confidence: 99%

Lying deadwood retention affects microhabitat use of martens (Martes spp.) in European mountain forests

Schwegmann,

Storch

2023

Wildlife Biology

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Biodiversity loss due to intensive timber production is a ubiquitous conservation issue across temperate and boreal forest ecosystems. Retention forestry, the retention of deadwood and old‐growth features within production forest, is one management strategy that has been implemented in various countries around the world to conserve a wide range of taxa within managed forests. The success and ecological implications of retention forestry are currently subject to intensive investigation and while some taxa like birds and insects have already been studied frequently, larger mammals have received less attention. Pine martens are one of the few larger mammals in central Europe preferring older forest and potentially profiting directly from deadwood retention as a consequence of implemented retention forestry. The goal of our study was to assess the response of European marten species to deadwood retention in montane mixed forests. Using marten detection rates from camera traps on 135 research plots we assessed the response of martens to deadwood at three different spatial scales using generalized linear mixed models. We found no effect of lying deadwood on marten detections at the plot scale (1 ha) or in a 10 m radius around the camera traps. However, we found a significant increase of marten detections if logs (> 10 cm in diameter) were directly in front and in view of the camera trap. Our results show that deadwood retention as a measure of retention forestry does affect microhabitat use of martens, but not stand selection during the growing season. Logs directly in view of the camera trap increase marten detection rates as martens choose to move and forage along fallen trees when they are available. When using camera trapping to collect data on martens, trap positioning in front of logs can heavily bias trapping results when unaccounted for.Keywords: beech marten, camera trapping, deadwood, logs, pine marten, retention forestry

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Effects of forest management on native bee biodiversity under the tallest trees in the world

Ealy,

Pawelek,

Hazlehurst

2023

Ecology and Evolution

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Coast redwood (Sequoia sempervirens) forests are a unique ecosystem within the global biodiversity hotspot of the California Floristic Province (Myers et al., 2000) that include the tallest trees in the world and are associated with many unique flora and fauna.Redwood forests have undergone intensive historical clear-cutting, and over the last 150 years 95% of mature primary (old growth) redwood forests were clear-cut (Noss, 2000). The majority of redwood forests today are mature secondary growth forests that have regenerated from large clear-cut areas. These secondary growth forests include naturally regenerating forests and areas that are actively managed through techniques like retention forestry, where for example, portions of tree stands are left un-cut in order to retain structural and compositional forest biodiversity. It is not known if critical ecological processes, such as the pollination of understory

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Structural elements enhanced by retention forestry promote forest and non-forest specialist bees and wasps

Cited by 9 publications

References 101 publications

Forest structure and heterogeneity increase diversity and alter composition of host–parasitoid networks

Forest structure and heterogeneity increase diversity and alter composition of host–parasitoid networks

Lying deadwood retention affects microhabitat use of martens (Martes spp.) in European mountain forests

Effects of forest management on native bee biodiversity under the tallest trees in the world

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