Abstract
Plant species of the Chaco seasonally dry forest of central Argentina have presumably been under a low evolutionary pressure to develop specialized fire-response traits, such as heat-stimulated germination. Nevertheless, other historical factors such as seasonal drought and/or endozoochorus dispersal could have led some species to develop heat-tolerant seeds. Therefore, heat-tolerant germination should be more common than heat-stimulated or heat-sensitive germination. To test this, we exposed seeds of 26 dominant species from the Chaco region to a broad range of experimental heat treatments and incubated them for 30 days at 25 °C and 12 h photoperiod. We then scored the percent germination and classified them as heat-stimulated, heat-tolerant or heat-sensitive based on their germination following heat treatments relative to control. Seventeen species showed heat-tolerant germination, including all native graminoids. Seven species showed heat-stimulated germination, under the less-intense heat treatments. Only two species showed heat-sensitive germination. Endozoochory had no influence on germination responses. We suggest that, unlike Mediterranean-climate ecosystems, fire was not a major evolutionary force in the development of Chaco forests, and our results provide greater understanding of the potential response of Chaco plant communities in the face of increasingly frequent fires.
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Acknowledgments
We are grateful to J. Di Rienzo and F. Casanoves for statistical advice and to G. Funes for useful comments on experimental design. We thank Dr. Juan Armesto and two anonymous reviewers for useful comments that greatly helped improving this paper. This study is a contribution of Núcleo DiverSus, endorsed by DIVERSITAS and the IGBP Global Land Project, and supported by FONCyT, CONICET, SeCyT-Universidad Nacional de Córdoba and the Inter-American Institute for Global Change Research (IAI) CRN 2015 and SGP-CRA 2015, which were supported by the US National Science Foundation (grants GEO-0452325 and GEO-1138881). The experiments comply with the current laws of the country (Argentina) in which the experiments were performed.
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Jaureguiberry, P., Díaz, S. Post-burning regeneration of the Chaco seasonally dry forest: germination response of dominant species to experimental heat shock. Oecologia 177, 689–699 (2015). https://doi.org/10.1007/s00442-014-3161-x
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DOI: https://doi.org/10.1007/s00442-014-3161-x