Abstract
Predictions of plant responses to climate change are frequently based on organisms’ presence in warmer locations, which are then assumed to reflect future performance in cooler areas. However, as plant life stages may be affected differently by environmental changes, there is little empirical evidence that this approach provides reliable estimates of short-term responses to global warming. Under this premise, we analyzed 8 years of early recruitment data, seed production and seedling establishment and survival, collected for two tree species at two latitudes. We quantified recruitment to a wide range of environmental conditions, temperature, soil moisture and light, and simulated recruitment under two forecasted climatic scenarios. Annual demographic transitions were affected by the particular conditions taking place during their onset, but the effects of similar environmental shifts differed among the recruitment stages; seed production was higher in warmer years, while seedling establishment and survival peaked during cold years. Within a species, these effects also varied between latitudes; increasing temperatures at the southern location will have stronger detrimental effects on recruitment than similar changes at the northern locations. Our simulations illustrate that warmer temperatures may increase seed production, but they will have a negative effect on establishment and survival. When the three early recruitment processes were simultaneously considered, simulations showed little change in recruitment dynamics at the northern site and a slight decrease at the southern site. It is only when we considered these three stages that we were able to assess likely changes in early recruitment under the predicted conditions.
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Acknowledgements
Funding was provided by the National Science Foundation (NSF) Grant (DEB 1252664) to I. Ibáñez, and by NSF-GRF and NSF-DDIG (DEB 11309805) to D. Katz.
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II conceived and designed the experiment. II, DK and BL collected data. II analyzed the data. II, DK and BL wrote the manuscript.
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Communicated by John Dwyer.
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Ibáñez, I., Katz, D.S.W. & Lee, B.R. The contrasting effects of short-term climate change on the early recruitment of tree species. Oecologia 184, 701–713 (2017). https://doi.org/10.1007/s00442-017-3889-1
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DOI: https://doi.org/10.1007/s00442-017-3889-1