Abstract Detail

Biogeography

Dupin, Julia [1], Smith, Stacey [2].

Historical biogeography and environmental niche evolution in Datureae (Solanaceae).

A main goal in biogeography is to understand patterns of clade distribution, that is, why different lineages have dispersed and established populations in some areas and not in others. Distribution patterns are shaped by abiotic factors such as climate, biotic factors such as competition, and historical aspects such as dispersal limitation. In this study, we estimate historical events and aspects of the environmental niche evolution in Datureae (Solanaceae) to explain the current geographical distribution of this clade. Datureae is a tribe in the Solanaceae family, with an estimated age of ca. 35 million years and it is composed of 18 species divided into three genera, Brugmansia, Datura and Trompettia. Maximum likelihood ancestral area reconstructions showed that Datureae originated in Andean regions and subsequently expanded its range to North America and non-Andean regions. Moreover, our analysis of environmental niche evolution that searched for significant shifts in environmental trait space and estimated niche overlap between genera showed that the ancestral environmental niche in the tribe is dry and that there has been a significant shift along the Brugmansia branch towards a more mesic type of environment. The long-distance dispersal to North America represented a range expansion into a familiar type of environment, a dry one. Over time, Datura and Brugmansia continued to expand their realized niche towards different areas of the niche space creating a niche shift, with Brugmansia occupying a significantly different and more mesic niche region than the rest of Datureae.

1 - University of Colorado at Boulder, Department of Ecology and Evolutionary Biology, Campus Box 334, Boulder, Colorado, 80309, USA
2 - University Of Colorado-Boulder, School Of Biological Sciences, Campus Box 334, Boulder, CO, 80309-0334, USA

Keywords:
Datureae
Solanaceae
biogeography
niche shift.

Presentation Type: Oral Paper
Session: 13, Biogeography
Location: Sundance 3/Omni Hotel
Date: Monday, June 26th, 2017
Time: 5:00 PM
Number: 13013
Abstract ID:497
Candidate for Awards:None