Landscape variables impact the structure and composition of butterfly assemblages along an urbanization gradient

Bergerot, Benjamin; Fontaine, Benoît; Julliard, Romain; Baguette, Michel

doi:10.1007/s10980-010-9537-3

Cited by 86 publications

(57 citation statements)

References 60 publications

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“…Possibly, both main pollinators groups, namely, flies and bees, have a threshold response to urbanization, and their reaction to urban conditions is highly species-specific, with some taxa responding positively to an increasing urbanization gradient, despite the general trend. This has been demonstrated for bees (Williams et al 2010) and butterflies (Bergerot et al 2011) and may be due to the fact that, in some cases, the urban surrounding may offer more appropriate conditions for these insects when compared with adjacent agricultural lands that are greatly impoverished due to agrotechnical activities (Bates et al 2011). Several authors have shown that some suburban or garden environments may even be useful to agriculture by providing a source of pollinators (Goulson et al 2002(Goulson et al , 2010Samnegard et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Flower-visitor and pollen transport networks in a large city: structure and properties

Jędrzejewska-Szmek

Zych

2013

Arthropod-Plant Interactions

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Plant species and their pollinators are linked by their mutualistic interactions, which form the basis of pollination networks. The use of a network approach allows one to take into account all interactions between a group of plants and its animal pollinators, and to reveal the structure of these connections. We analysed pollination interactions for urban habitat fragments located within the Warsaw city environment. We compared two similar, ruderal communities (phytosociological order Onopordetalia acanthii) located in distant parts of the city of Warsaw (Poland) that differed with the surrounding ecosystems. The aim of this study was to define the structures and properties of flower-visitor (visitation) and pollen transport networks (based on analysis of pollen loads carried by insects) and to assess the differences between the studied sites. Although the sites differed in insect relative abundance (Diptera dominated one study site, whereas Hymenoptera dominated the other), network size and structure were similar for both communities. In both cases, networks contained moderately specialized species (based on H 2 0 index); however, networks were dominated by apparently ecologically generalized insect taxa as well as those represented by a single specimen. Networks based on pollen transport indicated greater generality of insect species (more links) than those based on our samples of visitation. The most highly linked plant species represented were either the most abundant (Fabaceae) or phenotypically generalized taxa (Daucus carota). We conclude that plantpollinator interactions in such highly disturbed and isolated habitats are composed mostly of ecologically generalised species. Moreover, we stress the usefulness of pollen load analysis in the development and verification of visitation data.

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Section: Discussionmentioning

confidence: 99%

Flower-visitor and pollen transport networks in a large city: structure and properties

Jędrzejewska-Szmek

Zych

2013

Arthropod-Plant Interactions

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“…There are many examples of such studies, particularly from Europe and North America (e.g. Blair 1996;Clergeau et al 1998;Niemela et al 2009;Bergerot et al 2011;Fatel et al 2014). However, studies from the tropics are scarce, and for birds at least, there are few from developing countries (Marzluff et al 2001;Pautasso et al 2011), yet the developing world shows the highest rates of human population growth (United Nations Population Fund 2014), the highest rates of expected future urbanization of the human population (Cohen 2006), and most biodiversity hot-spots are in the developing world (Myers et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Trends in bird species richness, abundance and biomass along a tropical urbanization gradient

et al. 2016

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AcknowledgementsWe thank Lilian Twanza and Osman Mwebe, who also took part in some of the bird counts in Kampala, and to NatureUganda for data from the rural sites. We are also grateful to L. Bennun, J. Roberts, P. Robinson and J. Pierini for providing personal observations on scavenger populations in African cities, and to an anonymous referee whose constructive comments improved the manuscript. 3Abstract Impacts of urbanization on biodiversity are commonly studied using urbanization gradients which provide a space-for-time substitution in estimating consequences of urban expansion. Rates of urbanization and human population growth are high in tropical countries of the developing world, which also hold most of the world's biodiversity hot-spots, yet few studies have considered biodiversity trends along urban gradients in these regions. Bird communities across a gradient of nine sites in Uganda, from the city centre of Kampala to outlying rural locations, were studied over a six year period. These sites were ordered along an urbanization gradient using Principle Components Analysis based on habitat variables estimated at each site. Bird species richness showed a decrease from rural to urban sites, a trend especially evident in forest birds. There was no clear pattern in total abundance, total biomass or biomass per individual along the gradient. However, this latter result was heavily influenced by a colony of Marabou Storks at one site.When this species was omitted, there was evidence of a positive trend with urbanization, showing that as species richness decreased, the bird community was increasingly dominated by larger species with increasing urbanization, which were mainly scavengers able to exploit human refuse. These results provide further support for the negative impacts of urbanization on species richness, but also demonstrate trends in abundance and biomass are variable across different regions. In particular, the increasing dominance of larger species in urban areas may be relevant to certain geographic and/or socioeconomic contexts.

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“…Urbanization is usually considered to impact biodiversity (Blair and Launer 1997;McKinney 2002McKinney , 2006McKinney , 2008Bergerot et al 2011). Cities are generally grown in terms of human population size over time (Grimm et al 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Plants and animals have frequently experienced local extinction in urban area due to habitat loss, habitat degradation, and fragmentation (McKinney 2002;Clark et al 2007). Studies on the effects of urbanization on biodiversity in urban areas compared with rural areas have shown different species compositions and less abundance of organisms: e.g., mammals (George and Crooks 2006), amphibians (Osawa and Katsuno 2005;Hamer and McDonnell 2008), birds (Motegi and Yanai 2005;Rubèn and Ian 2009), ground beetles (Niemelä et al 2002;Lee and Ishii 2009;Lee and Kwon 2013), ants (Yamaguchi 2005;Lee and Kwon 2013), and butterflies (Imai 2004;Lee and Kwon 2012;Bergerot et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Diversity and density of butterfly communities in urban green areas: an analytical approach using GIS

et al. 2015

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Background: Urbanization is one of the leading causes of habitat loss, habitat degradation, and fragmentation. Urban development negatively affects biodiversity. We clarified changes in butterfly communities due to urbanization in urban green areas. Results: In total, 59 species and 1,465 individuals of butterflies were observed in the four urban green areas -Namsan Park (NS), Ewha Womans University (EW), Bukseoul Dream Forest (BD), and Hongneung Forest (HF) -and a natural forest, Gwangneung Forest (GF). The categories of land use around the study sites were determined based on GIS data. Species richness and density of niche breadth and habitat type in the four urban green areas differed mostly from those in GF. Estimated species richness and species diversity (H') in the four urban green areas were significantly lower than those in GF. Species richness and density of forest interior species and specialist species were positively correlated with paddy, field, and forest, whereas those of forest interior species and specialists were negatively correlated with urban area and road. Species composition and community structure of butterflies in the four urban were differed from those in GF.

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Landscape variables impact the structure and composition of butterfly assemblages along an urbanization gradient

Cited by 86 publications

References 60 publications

Flower-visitor and pollen transport networks in a large city: structure and properties

Flower-visitor and pollen transport networks in a large city: structure and properties

Trends in bird species richness, abundance and biomass along a tropical urbanization gradient

Diversity and density of butterfly communities in urban green areas: an analytical approach using GIS

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