The town Crepis and the country Crepis: How does fragmentation affect a plant–pollinator interaction?

Andrieu, Émilie; Dornier, Antoine; Rouifed, Soraya; Schatz, Bertrand; Cheptou, Pierre‐Olivier

doi:10.1016/j.actao.2008.07.002

Cited by 60 publications

(49 citation statements)

References 39 publications

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“…Our results show opposite patterns. Nevertheless, Andrieu et al [54] showed in C. sancta that the time pollinators spend searching for capitula is much longer in urban fragmented habitats than in unfragmented urban or rural habitats. Thus, a pollinator may take longer to find a patch of flowering Crepis growing alongside a tree on a Montpellier street, but once such a patch is located, the pollinator may then become less selective, foraging on all mature capitula while ignoring their size or height.…”

Section: (B) Selection In Urban Fragmented Habitatsmentioning

confidence: 99%

“…Thus, a pollinator may take longer to find a patch of flowering Crepis growing alongside a tree on a Montpellier street, but once such a patch is located, the pollinator may then become less selective, foraging on all mature capitula while ignoring their size or height. Although pollinators indeed choose to forage on bigger capitula in the countryside [54], foraging behaviour within urban patches suggests less selectivity, relaxing selection on reproductive traits linked to attractiveness (see also [56]). Given that producing larger capitula is likely to be more costly, relaxed competitive pressures on pollination in urban fragmented habitats could explain the pattern observed.…”

Section: (B) Selection In Urban Fragmented Habitatsmentioning

confidence: 99%

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Effects of fragmentation on plant adaptation to urban environments

Dubois¹,

Cheptou²

2017

Phil. Trans. R. Soc. B

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One contribution of 18 to a theme issue 'Human influences on evolution, and the ecological and societal consequences'. Urban ecosystems are relatively recent and heavily human-altered terrestrial ecosystems with a surprisingly high diversity of animals, plants and other organisms. Urban habitats are also strongly fragmented and subject to higher temperatures, providing a compelling model for studying adaptation to global change. Crepis sancta (Asteraceae), an annual Mediterranean wasteland weed, occupies fragmented urban environments as well as certain unfragmented landscapes in southern France. We tested for shifts in dispersal, reproductive traits and size across a rural-urban gradient to learn whether and how selection may be driving changes in life history in urban and fragmented habitats. We specifically compared the structure of quantitative genetic variation and of neutral markers (microsatellites) between urban and rural and between fragmented and unfragmented habitats. We showed that fragmentation provides a better descriptor of trait variation than urbanization per se for dispersal traits. Fragmentation also affected reproductive traits and plant size though one rural population did conform to this scheme. Our study shows the role of fragmentation for dispersal traits shift in urban environments and a more complex pattern for other traits. We discuss the role of pollinator scarcity and an inhospitable matrix as drivers of adaptation.This article is part of the themed issue 'Human influences on evolution, and the ecological and societal consequences'.

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Section: (B) Selection In Urban Fragmented Habitatsmentioning

confidence: 99%

Section: (B) Selection In Urban Fragmented Habitatsmentioning

confidence: 99%

Effects of fragmentation on plant adaptation to urban environments

Dubois¹,

Cheptou²

2017

Phil. Trans. R. Soc. B

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“…Within species, flower morphology can vary among habitats: certain plants in urban fragments have more, but smaller flower heads, which may decrease floral attractiveness and affect pollinator behaviour (Andrieu et al, 2009). Changes in pollinator behaviour could increase self-pollen deposition (Aizen and Feinsinger, 1994a,b), and drive a divergence in the evolution of floral traits in fragmented populations (Kingsolver et al, 2001;Pérez-Barrales et al, 2007).…”

Section: Plant Traitsmentioning

confidence: 99%

Biodiversity, Species Interactions and Ecological Networks in a Fragmented World

Hagen

Kissling

Rasmussen

et al. 2012

Advances in Ecological Research

347

352

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“…Another plant that blooms at the same time, may compete with the B. coccolobifolia proving Distrito Federal Barros (1992) to be more attractive in terms of reward (Duffy and Stout, 2008). Andrieu et al (2009) claim that the pollinators can adapt their foraging behavior according to the amount of resources available. Gómez et al (2007) argues that many plants are visited and pollinated by a wide variety of pollinators, thus they may be more likely to suffer Improper Pollen Transfer (IPT), covering the stigma but avoiding effective pollination (Duffy and Stout, 2008).…”

Section: Discussionmentioning

confidence: 99%

“…If the plant distance is large, pollination could be limited, and the plant fitness can be reduced due to reproductive failure or inbreeding depression, leading to a drop in genetic variability of the population and favoring local extinction. Moreover, according to Andrieu et al (2009), foraging behavior of some pollinators may be influenced by the amount of available resources and their spatial arrangement. In a fragmented landscape, pollinators may change their foraging mode, and eventually, seek other plant species as a resource according to the new reward/energy expenditure relation.…”

Section: Introductionmentioning

confidence: 99%

Pollination of Byrsonima coccolobifolia: short-distance isolation and possible causes for low fruit production

Amorim¹,

Marco²

2011

Braz. J. Biol.

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Byrsonima coccolobifolia is a tropical plant from the Malpighiaceae family, distributed in the neotropical savanna fields and pollinated by bees known as "collecting-oil bees". In this study, conducted in a Cerrado area located on a farm in the city of Silvânia, GO, the following hypothesis was tested: the greater the isolation degree of a plant, the lower its fruit production due to access difficulties for pollinators. Using a linear regression analysis, it was possible to relate the fruiting rate with the degree of isolation of each B. coccolobifolia individual and consequently it was found that the isolation had no influence on the pollination rate, an unexpected event that can be explained by the distance amongst individuals not being large enough to limit the movement of pollinators, or because cross-pollination was not the predominant form of reproduction, since the rate of cross-pollination was similar to self-pollination. It was also found that the proportion of fruits produced was lower than expected, a factor which may also have influenced the results.Keywords: pollination, isolation, habitat alteration, fruit production. Polinização de Byrsonima cocolobifolia: isolamento de curta distância e as possíveis causas para baixa produção de frutos ResumoByrsonima coccolobifolia é uma planta tropical da família Malpighiaceae, distribuída no Cerrado e polinizada por abelhas conhecidas como "abelhas coletoras-de-óleo". No presente estudo, realizado em área de cerrado localizada em uma fazenda no município de Silvânia, GO, foi testada a hipótese de que quanto maior o grau de isolamento de uma planta, menor sua produção de frutos, devido à dificuldade de acesso dos polinizadores. Através de uma análise de regressão linear foi possível relacionar a taxa de frutificação ao grau de isolamento de cada indivíduo de B. coccolobifolia, e verificou-se que o isolamento não exerceu influência alguma na produção de frutos, fato inesperado que pode ser explicado pela distância entre os indivíduos não ser suficientemente grande a ponto de limitar o trânsito de polinizadores, ou pelo fato da polinização cruzada não ser a forma predominante de reprodução, uma vez que a taxa de polinização cruzada foi semelhante à de autopolinização. Verificou-se ainda que a proporção de frutos produzidos foi abaixo do esperado, fator que também pode ter influenciado os resultados.Palavras-chave: polinização, isolamento, alteração de habitat, produção de frutos.

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The town Crepis and the country Crepis: How does fragmentation affect a plant–pollinator interaction?

Cited by 60 publications

References 39 publications

Effects of fragmentation on plant adaptation to urban environments

Effects of fragmentation on plant adaptation to urban environments

Biodiversity, Species Interactions and Ecological Networks in a Fragmented World

Pollination of Byrsonima coccolobifolia: short-distance isolation and possible causes for low fruit production

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