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Local Insect Availability Partly Explains Geographical Differences in Floral Visitor Assemblages of Arum maculatum L. (Araceae)

Geographical variation in abundance and composition of pollinator assemblages may result in variable selection pressures among plant populations and drive plant diversification. However, there is limited knowledge on whether differences in local visitor and pollinator assemblages are the result of s...

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Autores principales: Laina, Danae, Gfrerer, Eva, Scheurecker, Valerie, Fuchs, Roman, Schleifer, Marielle, Zittra, Carina, Wagner, Rüdiger, Gibernau, Marc, Comes, Hans Peter, Hörger, Anja C., Dötterl, Stefan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8957888/
https://www.ncbi.nlm.nih.gov/pubmed/35350299
http://dx.doi.org/10.3389/fpls.2022.838391
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author Laina, Danae
Gfrerer, Eva
Scheurecker, Valerie
Fuchs, Roman
Schleifer, Marielle
Zittra, Carina
Wagner, Rüdiger
Gibernau, Marc
Comes, Hans Peter
Hörger, Anja C.
Dötterl, Stefan
author_facet Laina, Danae
Gfrerer, Eva
Scheurecker, Valerie
Fuchs, Roman
Schleifer, Marielle
Zittra, Carina
Wagner, Rüdiger
Gibernau, Marc
Comes, Hans Peter
Hörger, Anja C.
Dötterl, Stefan
author_sort Laina, Danae
collection PubMed
description Geographical variation in abundance and composition of pollinator assemblages may result in variable selection pressures among plant populations and drive plant diversification. However, there is limited knowledge on whether differences in local visitor and pollinator assemblages are the result of site-specific strategies of plants to interact with their pollinators and/or merely reflect the pollinator availability at a given locality. To address this question, we compared locally available insect communities obtained by light-trapping with assemblages of floral visitors in populations of Arum maculatum (Araceae) from north vs. south of the Alps. We further investigated whether and how the abundance of different visitors affects plants’ female reproductive success and examined the pollen loads of abundant visitors. Local insect availability explained inter-regional differences in total visitor abundance, but only partly the composition of visitor assemblages. Northern populations predominantly attracted females of Psychoda phalaenoides (Psychodidae, Diptera), reflecting the high availability of this moth fly in this region. More generalized visitor assemblages, including other psychodid and non-psychodid groups, were observed in the south, where the availability of P. phalaenoides/Psychodidae was limited. Fruit set was higher in the north than in the south but correlated positively in both regions with the abundance of total visitors and psychodids; in the north, however, this relationship disappeared when visitor abundances were too high. High pollen loads were recorded on both psychodids and other Diptera. We demonstrate for the first time that the quantitative assessment of floral visitor assemblages in relation to locally available insect communities is helpful to understand patterns of geographical variation in plant–pollinator interactions. This combined approach revealed that geographical differences in floral visitors of A. maculatum are only partly shaped by the local insect availability. Potential other factors that may contribute to the geographical pattern of visitor assemblages include the region-specific attractiveness of this plant species to flower visitors and the population-specific behavior of pollinators.
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spelling pubmed-89578882022-03-28 Local Insect Availability Partly Explains Geographical Differences in Floral Visitor Assemblages of Arum maculatum L. (Araceae) Laina, Danae Gfrerer, Eva Scheurecker, Valerie Fuchs, Roman Schleifer, Marielle Zittra, Carina Wagner, Rüdiger Gibernau, Marc Comes, Hans Peter Hörger, Anja C. Dötterl, Stefan Front Plant Sci Plant Science Geographical variation in abundance and composition of pollinator assemblages may result in variable selection pressures among plant populations and drive plant diversification. However, there is limited knowledge on whether differences in local visitor and pollinator assemblages are the result of site-specific strategies of plants to interact with their pollinators and/or merely reflect the pollinator availability at a given locality. To address this question, we compared locally available insect communities obtained by light-trapping with assemblages of floral visitors in populations of Arum maculatum (Araceae) from north vs. south of the Alps. We further investigated whether and how the abundance of different visitors affects plants’ female reproductive success and examined the pollen loads of abundant visitors. Local insect availability explained inter-regional differences in total visitor abundance, but only partly the composition of visitor assemblages. Northern populations predominantly attracted females of Psychoda phalaenoides (Psychodidae, Diptera), reflecting the high availability of this moth fly in this region. More generalized visitor assemblages, including other psychodid and non-psychodid groups, were observed in the south, where the availability of P. phalaenoides/Psychodidae was limited. Fruit set was higher in the north than in the south but correlated positively in both regions with the abundance of total visitors and psychodids; in the north, however, this relationship disappeared when visitor abundances were too high. High pollen loads were recorded on both psychodids and other Diptera. We demonstrate for the first time that the quantitative assessment of floral visitor assemblages in relation to locally available insect communities is helpful to understand patterns of geographical variation in plant–pollinator interactions. This combined approach revealed that geographical differences in floral visitors of A. maculatum are only partly shaped by the local insect availability. Potential other factors that may contribute to the geographical pattern of visitor assemblages include the region-specific attractiveness of this plant species to flower visitors and the population-specific behavior of pollinators. Frontiers Media S.A. 2022-03-08 /pmc/articles/PMC8957888/ /pubmed/35350299 http://dx.doi.org/10.3389/fpls.2022.838391 Text en Copyright © 2022 Laina, Gfrerer, Scheurecker, Fuchs, Schleifer, Zittra, Wagner, Gibernau, Comes, Hörger and Dötterl. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Plant Science
Laina, Danae
Gfrerer, Eva
Scheurecker, Valerie
Fuchs, Roman
Schleifer, Marielle
Zittra, Carina
Wagner, Rüdiger
Gibernau, Marc
Comes, Hans Peter
Hörger, Anja C.
Dötterl, Stefan
Local Insect Availability Partly Explains Geographical Differences in Floral Visitor Assemblages of Arum maculatum L. (Araceae)
title Local Insect Availability Partly Explains Geographical Differences in Floral Visitor Assemblages of Arum maculatum L. (Araceae)
title_full Local Insect Availability Partly Explains Geographical Differences in Floral Visitor Assemblages of Arum maculatum L. (Araceae)
title_fullStr Local Insect Availability Partly Explains Geographical Differences in Floral Visitor Assemblages of Arum maculatum L. (Araceae)
title_full_unstemmed Local Insect Availability Partly Explains Geographical Differences in Floral Visitor Assemblages of Arum maculatum L. (Araceae)
title_short Local Insect Availability Partly Explains Geographical Differences in Floral Visitor Assemblages of Arum maculatum L. (Araceae)
title_sort local insect availability partly explains geographical differences in floral visitor assemblages of arum maculatum l. (araceae)
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8957888/
https://www.ncbi.nlm.nih.gov/pubmed/35350299
http://dx.doi.org/10.3389/fpls.2022.838391
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