Effect of canopy openness on the pressure of predatory arthropods and birds on epigeic insects

Šipoš, Ján; Drozdová, Michaela; Drozd, Pavel

doi:10.2478/s11535-012-0093-5

Cited by 6 publications

(2 citation statements)

References 49 publications

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“…The foliage complexity is known to favor arthropod survival in a wide range of habitats, because complex environments can provide: (i) safe places for resting (Šipoš & Kindlmann ); (ii) refuges from intraguild predation and cannibalism (Langellotto & Denno ); (iii) suitable microclimatic conditions (Šipoš et al . ); (iv) alternative food sources (Polis et al . ); and (v) increased numbers of potential prey (Polis et al .…”

Section: Discussionmentioning

confidence: 99%

Vertical distribution of earwigs (Dermaptera: Forficulidae) in a temperate lowland forest, based on sampling with a mobile aerial lift platform

Kirstová

Pyszko

Šipoš

et al. 2017

Entomological Science

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Although earwigs (Dermaptera) may be important components of ecosystems because of their locally high abundance and omnivory, their vertical distribution among forest strata is poorly understood. This study used a mobile aerial lift platform to survey the spatiotemporal distribution of earwigs along the vertical dimension in a forest. In 2013 and 2014, 57 trees in a lowland floodplain forest were sampled in the southeastern Czech Republic, Central Europe. Earwigs were collected along the complete vertical gradient of the foliage of the trees using square beating sheets and exhaustors. Of the three recorded earwig species (Apterygida media, Chelidura acanthopygia and Forficula auricularia), A. media was the most abundant. The distribution of its abundance with the height from ground (in the tree leaf layer) was unimodal, with a peak at 4–10 m, indicating that A. media is arboricolous. The vertical stratification of A. media differed among developmental stages, and in its abundance among tree species. Investigation of insect vertical stratification in forests should be facilitated by the use of a mobile aerial lift platform.

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Section: Discussionmentioning

confidence: 99%

Vertical distribution of earwigs (Dermaptera: Forficulidae) in a temperate lowland forest, based on sampling with a mobile aerial lift platform

Kirstová

Pyszko

Šipoš

et al. 2017

Entomological Science

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“…Ants, which are the dominant insect predators, are generally sensitive to high temperatures, and therefore they prefer not to forage in hot, open habitats (Holec et al ., ). The canopy of hedgerows or solitary trees does not have as large an impact on predation rates compared with the canopy of the forest interior (Šipoš et al ., ). Therefore, forest fragments in managed landscapes should have a sufficient central area to maintain a humid climate and forest litter.…”

Section: Discussionmentioning

confidence: 97%

Assessment of trends in predation pressure on insects across temperate forest microhabitats

Šipoš

Drozdová

Drozd

2013

Agri and Forest Entomology

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1 Experimental tests of whether predation pressure on insects is sometimes restricted to particular forest microhabitats have been carried out only in one or two vegetation periods and described for only a few predators. In the present study, we describe the seasonal dynamics of a wide spectrum of insect predators among forest microhabitats. 2 We also examine the impact of weather conditions on insect predation, and predict that forest openness would influence the predation trends among forest microhabitats. 3 The design of our experiments enabled direct measurement of relative predation pressure on bait (larvae of the blowfly Calliphora vicina) pinned onto selected microhabitats (the base, trunk and leaves of trees) within a temperate floodplain forest (Czech Republic). 4 The most parsimonious generalized additive model showed significant trends in the predation rate among the forest microhabitats. The highest predation rate for bait was at the base of trees and the lowest predation rate was on leaves. 5 We also observed significant differences in the species structure of predators in various microhabitats. The most common source of predation on trunks was from birds, whereas wasps were the most common predator on leaves and ants were the most common at the base of trees.in biomass partitioning among forest layers can influence the abundance of predators, with higher densities tending to be found in layers with the greatest amount of biomass (De Dijn, 2003;Vance et al ., 2007). This information can be useful when examining whether certain safe refuges for prey exist. For insects, spatial refuges can be located on different scales: (i) various habitats within a plant; (ii) different layers within the forest; and (iii) different types of forest habitat.Studies from tropical and temperate forests imply that predation activity differs across forest layers (Jeanne, 1979;Olson, 1992;Loiselle & Farji-Brener, 2002). The main disadvantages of recent predation studies are that they: (i) focus only on a few predators (mostly ants and birds); (ii) are carried out only in one or two growing seasons; (iii) do not examine diurnal or seasonal variability in the predation rate in different forest layers; and (iv) do not examine the effect of

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Characterizing Canopy Openness Across Large Forested Landscapes Using Spherical Densiometer and Smartphone Hemispherical Photography

Beeles

Tourville

Dovčiak

2021

Journal of Forestry

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Canopy openness is an important forest characteristic related to understory light environment and productivity. Although many methods exist to estimate canopy openness, comparisons of their performance tend to focus on relatively narrow ranges of canopy conditions and forest types. To address this gap, we compared two popular approaches for estimating canopy openness, traditional spherical densiometer and modern smartphone hemispherical photography, across a large range of canopy conditions (from closed canopy to large gaps) and forest types (from low-elevation broadleaf to high-elevation conifer forests) across four states in the northeastern United States. We took 988 field canopy openness measurements (494 per instrument) and compared them across canopy conditions using linear regression and t-tests. The extensive replication allowed us to quantify differences between the methods that may otherwise go unnoticed. Relative to the densiometer, smartphone photography overestimated low canopy openness (<10%) but it underestimated higher canopy openness (>10%), regardless of forest type.

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Effect of canopy openness on the pressure of predatory arthropods and birds on epigeic insects

Cited by 6 publications

References 49 publications

Vertical distribution of earwigs (Dermaptera: Forficulidae) in a temperate lowland forest, based on sampling with a mobile aerial lift platform

Vertical distribution of earwigs (Dermaptera: Forficulidae) in a temperate lowland forest, based on sampling with a mobile aerial lift platform

Assessment of trends in predation pressure on insects across temperate forest microhabitats

Characterizing Canopy Openness Across Large Forested Landscapes Using Spherical Densiometer and Smartphone Hemispherical Photography

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