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Plant performance across latitude: the role of plasticity and local adaptation in an aquatic plant

By L. Santamaria, J. Figuerola, J.J. Pilon, M. Mjelde, A.J. Green, T. De Boer, R.A. King and R.J. Gornall

Abstract

Geographic variation can lead to the evolution of different local varieties within a given species, therefore influencing its distribution and genetic structure. We investigated the contribution of plasticity and local adaptation to the performance of a common aquatic plant (Potamogeton pectinatus) in contrasting climates, using reciprocal transplants at three experimental sites across a latitudinal cline in Europe. Plants from 54 genets, originally collected from 14 populations situated within four climatic regions (subarctic, cold temperate, mild temperate, and mediterranean) were grown in three different localities within three of these regions (cold temperate, Norway; mild temperate, The Netherlands; mediterranean, Spain). Tuber production was highest for the mild-temperate genets, irrespective of locality where the genets were grown. Selection coefficients indicated that populations at the European center of the species distribution perform better than all other populations, at all sites. However, marginal populations showed changes in life-history traits, such as compressed life cycles in the north and true perenniality in the south, that may allow them to perform better locally, at the limits of their distribution range. Our results thus suggest that local adaptation may overlap spatially with center–periphery gradients in performance caused by genetic factors (such as genetic drift and inbreeding in range-marginal populations).Peer-reviewedPublisher Versio

Publisher: The Ecological Society of America
Year: 2003
DOI identifier: 10.1890/02-0431
OAI identifier: oai:lra.le.ac.uk:2381/1604
Journal:

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