Abstract
Trees are thought to be important for supporting urban biodiversity. However tree species differ considerably in the numbers of invertebrates they support, with potential consequences for higher trophic groups such as birds. In this study the influence of native and non-native trees on the abundance of insects (Hemiptera) and the incidence of insectivorous birds (Paridae) were investigated in the southern English town of Bracknell. The number and species of tree were recorded from each of 17 roundabout and parkland sites. Tree beating was used to sample arboreal Hemiptera and Paridae were recorded either with point counts and transect walks, depending on the size of the site. Due to the great variation between tree species, there was no overall significant difference in species richness or abundance of Hemiptera between native and non-native tree species. However, individual native trees had more species and individuals than non-natives. The proportion of native trees at Bracknell sites was positively related to the abundance of both Hemiptera and the number of Paridae observed. The consequences of vegetation type for insect abundance indicates that in order to sustain and enhance urban biodiversity, careful consideration needs to be given to species of trees present in urban areas.
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Acknowledgments
We are very grateful to Bracknell Forest Council and Bracknell Town Council for their advice and for allowing us to study the Bracknell sites. Dr. Bernard Nau provided draft copies of his key to the Miridae and Heteroptera checklist, and helped with the identification of some species.
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Appendices
Appendix 1 The number of native and non-native trees found on 17 roundabouts and parkland sites in Bracknell
Tree species | Roundabouts | Non-roundabouts | Total | |
Native species | ||||
Quercus robur L. | 11 | 145 | 156 | |
Crataegus monogyna Jacq. | 15 | 124 | 139 | |
Salix spp. | 23 | 63 | 86 | |
Betula pendula Roth | 30 | 40 | 70 | |
Pinus sylvestris L. | 68 | 2 | 70 | |
Fraxinus excelsior L. | 22 | 37 | 59 | |
Sorbus aucuparia L. | 28 | 17 | 45 | |
Populus spp. | 11 | 30 | 41 | |
Tilia spp. | 36 | 3 | 39 | |
Corylus avellana L. | 10 | 28 | 38 | |
Carpinus betulus L. | 27 | 3 | 30 | |
Fagus sylvatica L. | 6 | 15 | 21 | |
Acer campestre L. | 8 | 11 | 19 | |
Ilex aquifolium L. | 10 | 5 | 15 | |
Ulmus spp. | 0 | 15 | 15 | |
Alnus glutinosa (L.) Gaertner | 0 | 13 | 13 | |
Taxus baccata L. | 10 | 0 | 10 | |
Non-native species | ||||
Acer platanoides L. | 63 | 3 | 66 | |
Prunus sp.A | 18 | 38 | 56 | |
Platanus x hispanica Mill. ex Münchh | 25 | 3 | 28 | |
Acer pseudoplatanus L. | 16 | 5 | 21 | |
Prunus sp.B | 0 | 20 | 20 | |
Malus sp. | 4 | 12 | 16 | |
Sorbus intermedia (Ehrh.) | 12 | 2 | 14 | |
Quercus rubra L. | 6 | 5 | 11 | |
Other non-native | 34 | 19 | 53 | |
Total | 493 | 658 | 1151 | |
Total native | 315 | 551 | 866 | |
Total non-native | 178 | 107 | 285 | |
% non-native | 36.1 | 16.3 | 24.8 |
Appendix 2 The number of species of Hemiptera, corrected with rarefaction to 5 sampled trees, and the mean abundance of Hemiptera per tree. Non-native species are shown in bold
Tree species | Hemiptera species | Tree species | Hemiptera abundance |
Salix cinerea L. | 10.3 | Crataegus monogyna Jacq. | 12.8 |
Betula pendula Roth | 9.7 | Betula pendula Roth | 10.4 |
Salix caprea L. | 8.8 | Sorbus aucuparia L. | 10.2 |
Crataegus monogyna Jacq. | 8.4 | Fraxinus excelsior L. | 9.9 |
Quercus robur L. | 8.4 | Corylus avellana L. | 7.5 |
Acer campestre L. | 7.9 | Malus sp. | 7.4 |
Sorbus intermedia (Ehrh.) Pers. | 7.0 | Quercus robur L. | 5.2 |
Fraxinus excelsior L. | 6.9 | Salix caprea L. | 4.5 |
Carpinus betulus L. | 6.0 | Sorbus intermedia (Ehrh.) Pers. | 4.4 |
Quercus rubra L. | 6.0 | Salix cinerea L. | 3.8 |
Prunus sp. | 5.2 | Acer campestre L. | 3.3 |
Corylus avellana L. | 5.0 | Pinus sylvestris L. | 2.9 |
Tilia x europaea L. | 5.0 | Carpinus betulus L. | 2.5 |
Malus sp. | 4.1 | Prunus sp. | 1.9 |
Acer platanoides L. | 4.1 | Quercus rubra L. | 1.8 |
Pinus sylvestris L. | 4.1 | Tilia x europaea L. | 1.4 |
Sorbus aucuparia L. | 3.8 | Acer platanoides L. | 1.4 |
Acer pseudoplatanus L. | 3.7 | Fagus sylvatica L. | 1.3 |
Fagus sylvatica L. | 3.6 | Tilia platyphyllos Scop. | 1.1 |
Tilia platyphyllos Scop. | 2.8 | Acer pseudoplatanus L. | 1.0 |
Salix fragilis L. | 2.1 | Salix fragilis L. | 0.9 |
Platanus x hispanica Mill. ex Münchh | 1.1 | Platanus x hispanica Mill. ex Münchh | 0.2 |
Ilex aquifolium L. | 0.8 | Ilex aquifolium L. | 0.2 |
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Helden, A.J., Stamp, G.C. & Leather, S.R. Urban biodiversity: comparison of insect assemblages on native and non-native trees. Urban Ecosyst 15, 611–624 (2012). https://doi.org/10.1007/s11252-012-0231-x
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DOI: https://doi.org/10.1007/s11252-012-0231-x