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Abstract Detail


Neto-Bradley, Barbara [1], Lipsen, Linda P. J. [1], Whitton, Jeannette [1], Pennell, Matthew W. [2].

Macroevolutionary history predicts flowering time but not phenological response to climate change in grasses.

Long term observations show that flowering phenology has shifted in many lineages in response to climate change. However we do not know whether these results can be generalized to predict the presence, direction or magnitude of responses in lineages for which we lack long time-series of observations. If phenological responses are phylogenetically conserved, it would allow us to extrapolate from species for which we have data to predict responses of their close relatives. To assess this, we analyzed flowering time data from 3163 manually scored herbarium specimens from 72 species of grasses (Poaceae), collected over 115 years. We matched each record to historical climate data and used recently developed phylogenetic comparative methods to investigate the macroevolutionary dynamics of an emergent trait, the sensitivity of flowering time to temperature. We find that closely related grass species tend to flower at similar times, but flowering times respond to temperature changes in species-specific ways. Even when the timing of a phenological event is broadly phylogenetically conserved, this does not necessarily indicate that lineages will respond to changing environments in a similar way.

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1 - University Of British Columbia, Department Of Botany, 3529-6270 University BLVD, Vancouver, BC, V6T 1Z4, Canada
2 - University of British Columbia, Department of Zoology

none specified

Presentation Type: Oral Paper
Session: MACRO2, Macroevolution II
Location: Tucson B/Starr Pass
Date: Tuesday, July 30th, 2019
Time: 3:00 PM
Number: MACRO2007
Abstract ID:1344
Candidate for Awards:None

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