Morphological differentiation across the invasive range in Senecio madagascariensis populations.

Scientific Reports
Bruno DematteisJuan P Coulleri

Abstract

Invasive species are characterized by their ability to colonize new habitats and establish populations away from their native range. In this sense, these plants are expected to have plastic responses to adapt to the environmental pressures during the invasion process. Hence, the role of natural selection is essential because it might favor the occurrence of advantageous traits. However, gene flow can counteract natural selection because immigrants introduce genes adapted to different conditions, with these introductions tending to homogenize allelic frequencies. In this work, we explore the effect of natural selection in invasive populations of S. madagascariensis in Argentina. We quantified leaf area, head number, and length of internodes and inflorescence from material spanning 54 years (1962-2016) and then compared between the edge versus established ranges. Our results show differences in all the measured plant traits among the sampled areas. However, only leaf area was statistically significant, which evidences different responses under the same environmental pressures in the areas located in the edge and established ranges. On the other hand, unlike homogeneous areas, the areas characterized by phenotypically diverse indi...Continue Reading

References

Jun 22, 2000·Proceedings of the National Academy of Sciences of the United States of America·N C Ellstrand, K A Schierenbeck
Mar 16, 2007·Proceedings of the National Academy of Sciences of the United States of America·Sébastien Lavergne, Jane Molofsky
Nov 2, 2011·Annals of Botany·Mariska te BeestPetr Pysek
Jul 19, 2013·Ecology·John D ParkerLorne M Wolfe
Jun 19, 2018·Evolution; International Journal of Organic Evolution·Martin A SchäferWolf U Blanckenhorn

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