Roadside habitat impacts insect traffic mortality

Keilsohn, William; Narango, Desirée L.; Tallamy, Douglas W.

doi:10.1007/s10841-018-0051-2

Cited by 44 publications

(43 citation statements)

References 17 publications

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“…The importance of landscape composition surrounding habitat patches to community beta diversity in our study area is in line with past research on the effects of local landscapes on bee species richness and abundance (Guti errez-Chac on et al 2018, Ballare et al 2019). Many native forest bees are likely unable to cross the developed landscape matrix that exists between suitable forest patches in an urban-suburban environment (Ricketts 2001, Keilsohn et al 2018. Within our study area, bee community structure was not spatially correlated at sites greater than 3 km apart, though when assessed at the individual trap array, positive spatial autocorrelation was only detected within 1562.722 m (r = 0.104; P = 0.0013).…”

Section: Discussionsupporting

confidence: 83%

“…, Keilsohn et al. ). Preserving not only remnant forest patches but also corridors for movement could greatly facilitate inter‐patch connectivity for bees and other invertebrates, as bee density has been shown to increase with enhanced habitat connectivity in mosaicked landscapes (Steffan‐Dewenter ).…”

Section: Discussionmentioning

confidence: 99%

“…Many native forest bees are likely unable to cross the developed landscape matrix that exists between suitable forest patches in an urban–suburban environment (Ricketts , Keilsohn et al. ). Within our study area, bee community structure was not spatially correlated at sites greater than 3 km apart, though when assessed at the individual trap array, positive spatial autocorrelation was only detected within 1562.722 m ( r = 0.104; P = 0.0013).…”

Section: Discussionmentioning

confidence: 99%

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Local landscapes and microhabitat characteristics are important determinants of urban–suburban forest bee communities

et al. 2019

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Despite their diversity and abundance, the importance of native, forest bee communities to pollination services and inherent biological diversity conservation is often overlooked. We studied forest bee communities in Delaware and Pennsylvania, USA, to better understand how forest bee community structure varies with changing land use and microhabitat quality among small, urban and suburban forest fragments in the mid‐Atlantic United States. Our hypotheses were that (1) microhabitat quality would affect relative abundance of bee taxa, (2) surrounding landscape composition would drive local patch colonization–extinction dynamics, and (3) forest patch size would not affect community structure and composition. We found a lack of spatial autocorrelation among forest patches, indicating the importance of individual fragments in the autonomous generation and/or maintenance of bee communities. Community analyses revealed the importance of both landscape context and microhabitat quality in defining forest bee communities. By partitioning beta diversity into its constituent components, we also found that landscape composition drove changes in the relative abundance of taxa, while both landscape and microhabitat characteristics significantly influenced species turnover. Neither landscape composition nor quality of the microhabitat influenced initial site occupancy or colonization–extinction dynamics. Bisected by highways, suburban neighborhoods, agricultural lands, and urban development, many urban and suburban forest patches in the eastern United States are similar in composition to our study sites. As many native forest bees have limited capacity for long‐range movement between forest patches, these remaining forest fragments are critical to the conservation of unique and speciose forest bee communities.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Local landscapes and microhabitat characteristics are important determinants of urban–suburban forest bee communities

et al. 2019

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“…For example, we controlled for the effect of vegetation structure on insect abundance/diversity and risk of road mortality (Keilsohn et al, 2018;Ober & Hayes, 2008), by selecting transects that were as similar in vegetation structure as possible (along transects, among transects, and among freeways). For example, we controlled for the effect of vegetation structure on insect abundance/diversity and risk of road mortality (Keilsohn et al, 2018;Ober & Hayes, 2008), by selecting transects that were as similar in vegetation structure as possible (along transects, among transects, and among freeways).…”

Section: Roads and Road Network Can Have Detrimental Impacts On Wildmentioning

confidence: 99%

“…Roads can have detrimental impacts on invertebrate species, including barrier effects (Knapp et al, 2013;Koivula & Vermeulen, 2005), and road mortality (Baxter-Gilbert et al, 2015;Keilsohn, Narango, & Tallamy, 2018;Martin et al, 2018;Rao & Girish, 2007;Seibert & Conover, 1991). Roads can have detrimental impacts on invertebrate species, including barrier effects (Knapp et al, 2013;Koivula & Vermeulen, 2005), and road mortality (Baxter-Gilbert et al, 2015;Keilsohn, Narango, & Tallamy, 2018;Martin et al, 2018;Rao & Girish, 2007;Seibert & Conover, 1991).…”

Section: Introductionmentioning

confidence: 99%

Little evidence of a road‐effect zone for nocturnal, flying insects

Bhardwaj

Soanes

Lahoz‐Monfort

et al. 2018

Ecology and Evolution

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Roads and traffic may be contributing to global declines of insect populations. The ecological effects of roads often extend far into the surrounding habitat, over a distance known as the road‐effect zone. The quality of habitat in the road‐effect zone is generally degraded (e.g., due to edge effects, noise, light, and chemical pollution) and can be reflected in species presence, abundance, or demographic parameters. Road‐effect zones have been quantified for some vertebrate species but are yet to be quantified for insects. Investigating the road‐effect zone for insects will provide a better understanding of how roads impact ecosystems, which is particularly important given the role insects play as pollinators, predators, and prey for other species. We quantified the road‐effect zone for nocturnal flying insects along three major freeways in agricultural landscapes in southeast Australia. We collected insects using light traps at six points along 2‐km transects perpendicular to each highway (n = 17). We sorted the samples into order, and dried and weighed each order to obtain a measure of dry biomass. Using regression models within a Bayesian framework of inference, we estimated the change in biomass of each order with distance from the road, while accounting for environmental variables such as temperature, moon phase, and vegetation structure. The biomass of nine of the ten orders sampled did not change with distance from the freeway. Orthoptera (i.e., grasshoppers and crickets) was the only order whose biomass increased with distance from the freeway. From our findings, we suggest that the impacts of roads on insects are unlikely extending into the surrounding landscape over a distance of 2 km. Therefore, if there are impacts of roads on insects, these are more likely to be concentrated at the road itself, or on finer taxonomic scales such as family or genus level.

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Roadsides provide refuge for orchids: characteristic of the surrounding landscape

Fekete

Bódis

Fülöp

et al. 2020

Ecology and Evolution

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Seminatural habitats are declining throughout the world; thus, the role of small anthropogenic habitats in the preservation of plants is becoming increasingly appreciated. Here, we surveyed the orchid flora of roadside verges in five Central European countries (Austria, Hungary, Romania, Slovakia, and Slovenia) and tested how the surrounding landscape matrix affects the overall number of species and individuals, and also different functional groups of orchids. We found more than 2,000 individuals of 27 orchid species during our surveys. According to our results, the increasing coverage of agricultural and urban areas negatively affects both the number of orchid species and individuals on roadsides. Our study further suggests that differences in the surrounding habitats affect which species are found on roadsides, since the increasing coverage of grasslands or forested areas around orchid occurrences had a significant positive effect on the number of grassland or forest-dwelling species and individuals, respectively. Most variance in orchid numerosity and diversity was explained by the cover of the suitable habitat types of the respective taxa in the surrounding landscape of the sampling points. This highlights the importance of roadsides acting as refugia for numerous species and valuable plant communities as well as in supporting biodiversity in general.

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Roadside habitat impacts insect traffic mortality

Cited by 44 publications

References 17 publications

Local landscapes and microhabitat characteristics are important determinants of urban–suburban forest bee communities

Local landscapes and microhabitat characteristics are important determinants of urban–suburban forest bee communities

Little evidence of a road‐effect zone for nocturnal, flying insects

Roadsides provide refuge for orchids: characteristic of the surrounding landscape

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