Detecting local adaptation in widespread grassland species - the importance of scale and local plant community

• Published in: The Journal of ecology 2006-11, Vol.94 (6), p.1130-1142
• Main Authors: BISCHOFF, ARMIN, CRÉMIEUX, LISÈLE, SMILAUEROVA, MARIE, LAWSON, CLARE S, MORTIMER, SIMON R, DOLEZAL, JIRI, LANTA, VOJTECH, EDWARDS, ANDREW R, BROOK, ALEX J, MACEL, MIRKA, LEPS, JAN, STEINGER, THOMAS, MÜLLER-SCHÄRER, HEINZ
• Format: Article
• Language: English
• Subjects: Animal and plant ecology; Animal, plant and microbial ecology; Applied ecology; Biological adaptation; Biological and medical sciences; Botany; competition; Conservation, protection and management of environment and wildlife; Ecological competition; ecological restoration; Environmental degradation: ecosystems survey and restoration; field experimentation; Flowers & plants; forage crops; Fundamental and applied biological sciences. Psychology; General aspects; geographical distance; geographical variation; Grasses; grasslands; Habitats; Holcus lanatus; home‐site advantage; Human ecology; Lotus corniculatus; Plant adaptation; plant communities; plant competition; Plant ecology; Plant populations; Plant Responses to Biotic and Abiotic Factors; Plantago lanceolata; Plants; population differentiation; Population ecology; Provenance; provenance choice; reciprocal transplant; Seedling emergence; spatial variation; sward
• ISSN: 0022-0477; 1365-2745
• DOI: 10.1111/j.1365-2745.2006.01174.x

1 Adaptation of plant populations to local environments has been shown in many species but local adaptation is not always apparent and spatial scales of differentiation are not well known. In a reciprocal transplant experiment we tested whether: (i) three widespread grassland species are locally adapted at a European scale; (ii) detection of local adaptation depends on competition with the local plant community; and (iii) local differentiation between neighbouring populations from contrasting habitats can be stronger than differentiation at a European scale. 2 Seeds of Holcus lanatus, Lotus corniculatus and Plantago lanceolata from a Swiss, Czech and UK population were sown in a reciprocal transplant experiment at fields that exhibit environmental conditions similar to the source sites. Seedling emergence, survival, growth and reproduction were recorded for two consecutive years. 3 The effect of competition was tested by comparing individuals in weeded monocultures with plants sown together with species from the local grassland community. To compare large-scale vs. small-scale differentiation, a neighbouring population from a contrasting habitat (wet-dry contrast) was compared with the 'home' and 'foreign' populations. 4 In P. lanceolata and H. lanatus, a significant home-site advantage was detected in fitness-related traits, thus indicating local adaptation. In L. corniculatus, an overall superiority of one provenance was found. 5 The detection of local adaptation depended on competition with the local plant community. In the absence of competition the home-site advantage was underestimated in P. lanceolata and overestimated in H. lanatus. 6 A significant population differentiation between contrasting local habitats was found. In some traits, this small-scale was greater than large-scale differentiation between countries. 7 Our results indicate that local adaptation in real plant communities cannot necessarily be predicted from plants grown in weeded monocultures and that tests on the relationship between fitness and geographical distance have to account for habitat-dependent small-scale differentiation. Considering the strong small-scale differentiation, a local provenance from a different habitat may not be the best choice in ecological restoration if distant populations from a more similar habitat are available.