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Hummingbird community structure and nectar resources modulate the response of interspecific competition to forest conversion

On-going land-use change has profound impacts on biodiversity by filtering species that cannot survive in disturbed landscapes and potentially altering biotic interactions. In particular, how land-use change reshapes biotic interactions remains an open question. Here, we used selectivity experiments...

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Autores principales: Guevara, Esteban A., Bello, Carolina, Poveda, Cristian, McFadden, Ian R., Schleuning, Matthias, Pellissier, Loïc, Graham, Catherine H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10038955/
https://www.ncbi.nlm.nih.gov/pubmed/36754882
http://dx.doi.org/10.1007/s00442-023-05330-z
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author Guevara, Esteban A.
Bello, Carolina
Poveda, Cristian
McFadden, Ian R.
Schleuning, Matthias
Pellissier, Loïc
Graham, Catherine H.
author_facet Guevara, Esteban A.
Bello, Carolina
Poveda, Cristian
McFadden, Ian R.
Schleuning, Matthias
Pellissier, Loïc
Graham, Catherine H.
author_sort Guevara, Esteban A.
collection PubMed
description On-going land-use change has profound impacts on biodiversity by filtering species that cannot survive in disturbed landscapes and potentially altering biotic interactions. In particular, how land-use change reshapes biotic interactions remains an open question. Here, we used selectivity experiments with nectar feeders in natural and converted forests to test the direct and indirect effects of land-use change on resource competition in Andean hummingbirds along an elevational gradient. Selectivity was defined as the time hummingbirds spent at high resource feeders when feeders with both low and high resource values were offered in the presence of other hummingbird species. Selectivity approximates the outcome of interspecific competition (i.e., the resource intake across competing species); in the absence of competition, birds should exhibit higher selectivity. We evaluated the indirect effect of forest conversion on selectivity, as mediated by morphological dissimilarity and flower resource abundance, using structural equation models. We found that forest conversion influenced selectivity at low and mid-elevations, but the influence of morphological dissimilarity and resource availability on selectivity varied between these elevations. At mid-elevation, selectivity was more influenced by the presence of morphologically similar competitors than by resource abundance while at low-elevation resource abundance was a more important predictor of selectivity. Our results suggest that selectivity is influenced by forest conversion, but that the drivers of these changes vary across elevation, highlighting the importance of considering context-dependent variation in the composition of resources and competitors when studying competition. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00442-023-05330-z.
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spelling pubmed-100389552023-03-26 Hummingbird community structure and nectar resources modulate the response of interspecific competition to forest conversion Guevara, Esteban A. Bello, Carolina Poveda, Cristian McFadden, Ian R. Schleuning, Matthias Pellissier, Loïc Graham, Catherine H. Oecologia Community Ecology–Original Research On-going land-use change has profound impacts on biodiversity by filtering species that cannot survive in disturbed landscapes and potentially altering biotic interactions. In particular, how land-use change reshapes biotic interactions remains an open question. Here, we used selectivity experiments with nectar feeders in natural and converted forests to test the direct and indirect effects of land-use change on resource competition in Andean hummingbirds along an elevational gradient. Selectivity was defined as the time hummingbirds spent at high resource feeders when feeders with both low and high resource values were offered in the presence of other hummingbird species. Selectivity approximates the outcome of interspecific competition (i.e., the resource intake across competing species); in the absence of competition, birds should exhibit higher selectivity. We evaluated the indirect effect of forest conversion on selectivity, as mediated by morphological dissimilarity and flower resource abundance, using structural equation models. We found that forest conversion influenced selectivity at low and mid-elevations, but the influence of morphological dissimilarity and resource availability on selectivity varied between these elevations. At mid-elevation, selectivity was more influenced by the presence of morphologically similar competitors than by resource abundance while at low-elevation resource abundance was a more important predictor of selectivity. Our results suggest that selectivity is influenced by forest conversion, but that the drivers of these changes vary across elevation, highlighting the importance of considering context-dependent variation in the composition of resources and competitors when studying competition. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00442-023-05330-z. Springer Berlin Heidelberg 2023-02-09 2023 /pmc/articles/PMC10038955/ /pubmed/36754882 http://dx.doi.org/10.1007/s00442-023-05330-z Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Community Ecology–Original Research
Guevara, Esteban A.
Bello, Carolina
Poveda, Cristian
McFadden, Ian R.
Schleuning, Matthias
Pellissier, Loïc
Graham, Catherine H.
Hummingbird community structure and nectar resources modulate the response of interspecific competition to forest conversion
title Hummingbird community structure and nectar resources modulate the response of interspecific competition to forest conversion
title_full Hummingbird community structure and nectar resources modulate the response of interspecific competition to forest conversion
title_fullStr Hummingbird community structure and nectar resources modulate the response of interspecific competition to forest conversion
title_full_unstemmed Hummingbird community structure and nectar resources modulate the response of interspecific competition to forest conversion
title_short Hummingbird community structure and nectar resources modulate the response of interspecific competition to forest conversion
title_sort hummingbird community structure and nectar resources modulate the response of interspecific competition to forest conversion
topic Community Ecology–Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10038955/
https://www.ncbi.nlm.nih.gov/pubmed/36754882
http://dx.doi.org/10.1007/s00442-023-05330-z
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