Effects of dead wood volume and connectivity on saproxylic insect species diversity

Schiegg, Karin

doi:10.1080/11956860.2000.11682598

Cited by 133 publications

(92 citation statements)

References 41 publications

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“…The sensor captured four returns per pulse. Data was collected for a total area of 107 km 2 at an average density of at least 9 pulses per m 2 . The point density often exceeded 20 returns per square meter in dense forest canopy.…”

Section: Lidar Datamentioning

confidence: 99%

“…Dead woody material on the forest floor is an essential structural component of forest ecosystems: downed dead wood provides habitat for species, is a fuel source for forest fires, and is a key component of forest nutrient cycling and carbon storage [1][2][3]. Information on the quantity and location of downed logs in forests is important for assessing fire risk [4,5], measuring dead biomass for carbon storage estimates [6], biodiversity and nutrient cycling [7,8], forest management and silviculture [9,10], and wildlife habitat monitoring and modeling [11].…”

Section: Introductionmentioning

confidence: 99%

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Object-Based Image Analysis of Downed Logs in Disturbed Forested Landscapes Using Lidar

2011

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Downed logs on the forest floor provide habitat for species, fuel for forest fires, and function as a key component of forest nutrient cycling and carbon storage. Ground-based field surveying is a conventional method for mapping and characterizing downed logs but is limited. In addition, optical remote sensing methods have not been able to map these ground targets due to the lack of optical sensor penetrability into the forest canopy and limited sensor spectral and spatial resolutions. Lidar (light detection and ranging) sensors have become a more viable and common data source in forest science for detailed mapping of forest structure. This study evaluates the utility of discrete, multiple return airborne lidar-derived data for image object segmentation and classification of downed logs in a disturbed forested landscape and the efficiency of rule-based object-based image analysis (OBIA) and classification algorithms. Downed log objects were successfully delineated and classified from lidar derived metrics using an OBIA framework. 73% of digitized downed logs were completely or partially classified correctly. Over classification occurred in areas with large numbers of logs clustered in close proximity to one another and in areas with vegetation and tree canopy. The OBIA methods were found to be effective but inefficient in terms of automation and analyst's time in the delineation and classification of downed logs in the lidar data.

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Section: Lidar Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Object-Based Image Analysis of Downed Logs in Disturbed Forested Landscapes Using Lidar

2011

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“…2003) or spatial distribution (Schiegg 2000). Among them, longhorn beetles (Coleoptera, Cerambycidae) and hoverflies (Diptera, Syrphidae) share similar broad ecological requirements.…”

Section: Introductionmentioning

confidence: 99%

Contrasting Responses of Saproxylic Insects to Focal Habitat Resources: The Example of Longhorn Beetles and Hoverflies in Belgian Deciduous Forests

et al. 2006

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Although both saproxylic longhorn beetles and hoverflies benefit from the presence of woody substrates for reproduction, they differ in their requirements for floral resources and for microbiotopes of overmature and senescent trees. This led us to expect contrasting responses between the two species groups in relation to these essential resources. We examined this prediction in 22 mature oak-and beech-dominated stands of southern Belgium by relating their species assemblages to local vegetation structure and composition, altitude and landscape composition. Stands were organised in pairs as a function of their overall dead wood supply. Free-hanging window traps, stump emergence traps and Malaise traps produced 30 longhorn beetle species (1637 individuals) and 106 hoverfly species (3020 individuals). Paired-comparisons controlling for annual variation in captures showed that, unlike saproxylic hoverflies, stands with dead wood hosted more species and individuals of longhorn beetles. Accordingly, the two species groups were found to be independent on ordination axes, responding to different sets of environmental conditions. While stands dominated by oaks with a high snag volume were highly favoured by longhorn beetles, saproxylic and threatened syrphids were limited to open-stands with large trees and a well-developed, species rich herb layer providing the floral resources required for their reproduction. Our results suggest that, when defining criteria to identify or restore important habitats for saproxylic insect conservation, variables related to different aspects of dead wood supply should not be the only criteria taken into account.

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“…Over-mature trees and deadwood with large diameters are usually absent from managed temperate forests. Their conservation may reduce timber yield, but these old trees are of high value for biodiversity conservation by providing habitats for numerous specialized organisms, including hole-nesting birds, bats, xylophagous insects, fungi, lichens, and bryophytes, that are rare or absent from the earlier development stages (Schiegg 2000;Ó dor and others 2006;Hilmo and others 2009).…”

Section: Introductionmentioning

confidence: 99%

Significance of Over-Mature and Decaying Trees for Carbon Stocks in a Central European Natural Spruce Forest

et al. 2012

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Old-growth forests are important stores for carbon as they may accumulate C for centuries. The alteration of biomass and soil carbon pools across the development stages of a forest dynamics cycle has rarely been quantified. We studied the above-and belowground C stocks in the five forest development stages (regeneration to decay stage) of a montane spruce (Picea abies) forest of the northern German Harz Mountains, one of Central Europe's few forests where the natural forest dynamics have not been disturbed by man for several centuries. The over-mature and decay stages had the largest total (up to 480 Mg C ha -1 ) and aboveground biomass carbon pools (200 Mg C ha -1 ) with biomass C stored in dead wood in the decay stage. The soil C pool (220-275 Mg C ha -1 , 0-60 cm) was two to three times larger than in temperate lowland spruce forests and remained invariant across the forest dynamics cycle. On the landscape level, taking into account the frequency of the five forest development stages, the total carbon pool was approximately 420 Mg C ha -1 . The results evidence the high significance of over-mature and decaying stages of temperate mountain forests not only for conserving specialized forest organisms but also for their large carbon storage potential.

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Effects of dead wood volume and connectivity on saproxylic insect species diversity

Cited by 133 publications

References 41 publications

Object-Based Image Analysis of Downed Logs in Disturbed Forested Landscapes Using Lidar

Object-Based Image Analysis of Downed Logs in Disturbed Forested Landscapes Using Lidar

Contrasting Responses of Saproxylic Insects to Focal Habitat Resources: The Example of Longhorn Beetles and Hoverflies in Belgian Deciduous Forests

Significance of Over-Mature and Decaying Trees for Carbon Stocks in a Central European Natural Spruce Forest

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