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Restoring population structure and dynamics in translocated species: learning from wild populations

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Abstract

Conservation of Leucojum aestivum, a wetland-dependent species distributed in Europe and west Asia, should aim to reduce the fragmentation of wild stands, through the establishment of new populations. However, density-dependent dynamics occur in L. a estivum. For instance, fruit set and seed set increase with increasing plant density. In this study, we evaluate the effect of plant density on translocation success of two recently established populations of L. a estivum. Twenty-six populations of L. a estivum were investigated in northern Italy to find out differences in population traits (size, density, age structure, and reproductive performance) between populations from different habitats. Data obtained were used to establish two new populations of the species differing for population density (high H, mirroring the typical plant density of a wild population in Salix alba woods and low L, in which plant density was halved compared to H), to evaluate the role of density-dependent dynamics on the translocation success. 4 years after the translocation, H produced seedlings, while L did not. Moreover, H produced a significantly higher number of fruits per fruiting plant and higher fruit set. Seed set was also greater in H than in L, while mortality was greater in L than in H, but differences were not significant. Our results suggest that population density is an important factor to account for in newly established populations, especially in those species showing density-dependent population dynamics. Moreover, the imitation of successful within-population dynamics occurring in natural stable populations may increase the translocation success.

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Acknowledgments

The authors are grateful to V. Dominione, A. Morini, L. Zubani, S. Pedrini, E. Vegini, F. Nai Oleari, M. Cere, C. Albrecht and M.I. Manisco, (University of Pavia), M. Donati and L. Ghillani for their valuable contribution during field work. The authors thank D. Matthies (University of Marburg) for his precious suggestions during the study of wild populations. The authors thank E. Ottolini and E. Fior (LIFE07 NAT/IT/000499 “Pianura Parmense” Staff Members) for their logistic and practical support during the translocation. The authors are also grateful to A. Manzi and S. Panzeri (University of Milan) for the determination of VOC in flowers of L. a estivum. The translocation has received financial support from the LIFE + project 2007 NAT/IT/000499 “Pianura Parmense.”

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Authors and Affiliations

  1. Department of Earth and Environmental Sciences, University of Pavia, Pavia, Italy

    Thomas Abeli & Graziano Rossi

  2. IUCN/SSC Reintroduction Specialist Group, Abu Dhabi, UAE

    Thomas Abeli

  3. Department of Agricultural and Environmental Sciences-Production, Landscape, Agroenergy, University of Milan, Milan, Italy

    Paolo Cauzzi, Ilda Vagge & Simone Orsenigo

  4. LIFE07 NAT/IT/000499 “Pianura Parmense” Staff Member, Parma, Italy

    Michele Adorni

  5. Pavia, Italy

    Gilberto Parolo

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  1. Thomas Abeli
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  2. Paolo Cauzzi
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Correspondence to Simone Orsenigo.

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Communicated by Dr. Thomas Abeli and Prof. Kingsley Dixon.

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Abeli, T., Cauzzi, P., Rossi, G. et al. Restoring population structure and dynamics in translocated species: learning from wild populations. Plant Ecol 217, 183–192 (2016). https://doi.org/10.1007/s11258-015-0529-x

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