Flying insect biomass is negatively associated with urban cover in surrounding landscapes
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Flying insect biomass is negatively associated with urban cover in surrounding landscapes. / Svenningsen, Cecilie S.; Bowler, Diana E.; Hecker, Susanne; Bladt, Jesper; Grescho, Volker; van Dam, Nicole M.; Dauber, Jens; Eichenberg, David; Ejrnæs, Rasmus; Fløjgaard, Camilla; Frenzel, Mark; Frøslev, Tobias G.; Hansen, Anders J.; Heilmann-Clausen, Jacob; Huang, Yuanyuan; Larsen, Jonas C.; Menger, Juliana; Nayan, Nur L. B. M.; Pedersen, Lene B.; Richter, Anett; Dunn, Robert R.; Tøttrup, Anders P.; Bonn, Aletta.
In: Diversity and Distributions, Vol. 28, No. 6, 2022, p. 1242-1254.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Flying insect biomass is negatively associated with urban cover in surrounding landscapes
AU - Svenningsen, Cecilie S.
AU - Bowler, Diana E.
AU - Hecker, Susanne
AU - Bladt, Jesper
AU - Grescho, Volker
AU - van Dam, Nicole M.
AU - Dauber, Jens
AU - Eichenberg, David
AU - Ejrnæs, Rasmus
AU - Fløjgaard, Camilla
AU - Frenzel, Mark
AU - Frøslev, Tobias G.
AU - Hansen, Anders J.
AU - Heilmann-Clausen, Jacob
AU - Huang, Yuanyuan
AU - Larsen, Jonas C.
AU - Menger, Juliana
AU - Nayan, Nur L. B. M.
AU - Pedersen, Lene B.
AU - Richter, Anett
AU - Dunn, Robert R.
AU - Tøttrup, Anders P.
AU - Bonn, Aletta
N1 - Publisher Copyright: © 2022 The Authors. Diversity and Distributions published by John Wiley & Sons Ltd.
PY - 2022
Y1 - 2022
N2 - Aim: In this study, we assessed the importance of local- to landscape-scale effects of land cover and land use on flying insect biomass. Location: Denmark and parts of Germany. Methods: We used rooftop-mounted car nets in a citizen science project (“InsectMobile”) to allow for large-scale geographic sampling of flying insects. Volunteers sampled insects along 278 five-km routes in urban, farmland, grassland, wetland and forest landscapes in the summer of 2018. The bulk insect samples were dried overnight to obtain the sample biomass. We extracted proportional land use variables in buffers between 50 and 1,000 m along the routes and compiled them into land cover categories to examine the effect of each land cover, and specific land use types, on insect biomass. Results: We found a negative association between urban cover and flying insect biomass (1% increase in urban cover = 1% [95% CI: −3.0 to 0.0] decrease in biomass in Denmark, and a 3% [95% CI: −3.0 to 0.0] decrease in Germany) at a landscape scale (1,000-m buffer). In Denmark, we also found positive effects of semi-natural land cover types, that is protected grassland (largest at the landscape scale, 1000 m) and forests (largest at intermediate scales, 250 m). Protected grassland cover had a stronger positive effect on insect biomass than forest cover did. For farmland cover, the positive association with insect biomass was not clearly modified by any variable associated with farmland use intensity. The negative association between insect biomass and urban land cover appeared to be reduced by increased urban green space. Main conclusions: Our results show that land cover has an impact on flying insect biomass with the magnitude of this effect varying across spatial scales. However, the vast expanse of grey space in urbanized areas has a direct negative impact on flying insect biomass across all spatial scales examined.
AB - Aim: In this study, we assessed the importance of local- to landscape-scale effects of land cover and land use on flying insect biomass. Location: Denmark and parts of Germany. Methods: We used rooftop-mounted car nets in a citizen science project (“InsectMobile”) to allow for large-scale geographic sampling of flying insects. Volunteers sampled insects along 278 five-km routes in urban, farmland, grassland, wetland and forest landscapes in the summer of 2018. The bulk insect samples were dried overnight to obtain the sample biomass. We extracted proportional land use variables in buffers between 50 and 1,000 m along the routes and compiled them into land cover categories to examine the effect of each land cover, and specific land use types, on insect biomass. Results: We found a negative association between urban cover and flying insect biomass (1% increase in urban cover = 1% [95% CI: −3.0 to 0.0] decrease in biomass in Denmark, and a 3% [95% CI: −3.0 to 0.0] decrease in Germany) at a landscape scale (1,000-m buffer). In Denmark, we also found positive effects of semi-natural land cover types, that is protected grassland (largest at the landscape scale, 1000 m) and forests (largest at intermediate scales, 250 m). Protected grassland cover had a stronger positive effect on insect biomass than forest cover did. For farmland cover, the positive association with insect biomass was not clearly modified by any variable associated with farmland use intensity. The negative association between insect biomass and urban land cover appeared to be reduced by increased urban green space. Main conclusions: Our results show that land cover has an impact on flying insect biomass with the magnitude of this effect varying across spatial scales. However, the vast expanse of grey space in urbanized areas has a direct negative impact on flying insect biomass across all spatial scales examined.
KW - biomass
KW - citizen science
KW - insects
KW - land cover
KW - land use intensity
U2 - 10.1111/ddi.13532
DO - 10.1111/ddi.13532
M3 - Journal article
AN - SCOPUS:85128916802
VL - 28
SP - 1242
EP - 1254
JO - Diversity and Distributions
JF - Diversity and Distributions
SN - 1366-9516
IS - 6
ER -
ID: 307742801