Using ecological context to interpret spatiotemporal variation in natural selection.

Autor: Albertsen E; Norwegian Institute for Bioeconomy Research, Trondheim, 7031, Norway.; Centre for Biodiversity Dynamics, Department of Biology, Norwegian University of Science and Technology, Trondheim, 7491, Norway., Opedal ØH; Centre for Biodiversity Dynamics, Department of Biology, Norwegian University of Science and Technology, Trondheim, 7491, Norway.; Department of Biology, Lund University, Lund, SE-22362, Sweden., Bolstad GH; Norwegian Institute for Nature Research (NINA), Trondheim, 7485, Norway., Pérez-Barrales R; School of Biological Sciences, University of Portsmouth, Portsmouth, PO1 2DY, United Kingdom., Hansen TF; Centre for Ecological and Evolutionary Synthesis, Department of Biology, University of Oslo, Oslo, 0316, Norway., Pélabon C; Centre for Biodiversity Dynamics, Department of Biology, Norwegian University of Science and Technology, Trondheim, 7491, Norway., Armbruster WS; School of Biological Sciences, University of Portsmouth, Portsmouth, PO1 2DY, United Kingdom.; Institute of Arctic Biology, University of Alaska, Fairbanks, Alaska, 99775, USA.
Jazyk: angličtina
Zdroj: Evolution; international journal of organic evolution [Evolution] 2021 Feb; Vol. 75 (2), pp. 294-309. Date of Electronic Publication: 2020 Dec 25.
DOI: 10.1111/evo.14136
Abstrakt: Spatiotemporal variation in natural selection is expected, but difficult to estimate. Pollinator-mediated selection on floral traits provides a good system for understanding and linking variation in selection to differences in ecological context. We studied pollinator-mediated selection in five populations of Dalechampia scandens (Euphorbiaceae) in Costa Rica and Mexico. Using a nonlinear path-analytical approach, we assessed several functional components of selection, and linked variation in pollinator-mediated selection across time and space to variation in pollinator assemblages. After correcting for estimation error, we detected moderate variation in net selection on two out of four blossom traits. Both the opportunity for selection and the mean strength of selection decreased with increasing reliability of cross-pollination. Selection for pollinator attraction was consistently positive and stronger on advertisement than reward traits. Selection on traits affecting pollen transfer from the pollinator to the stigmas was strong only when cross-pollination was unreliable and there was a mismatch between pollinator and blossom size. These results illustrate how consideration of trait function and ecological context can facilitate both the detection and the causal understanding of spatiotemporal variation in natural selection.
(© 2020 The Authors. Evolution © 2020 The Society for the Study of Evolution.)
Databáze: MEDLINE
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