Proximity to roads disrupts rodents’ contributions to seed dispersal services and subsequent recruitment dynamics

Journal of Ecology - Tập 107 Số 6 - Trang 2623-2634 - 2019
Wenwen Chen1,2, Jie Zhong3,2, Walter P. Carson4, Zhanhui Tang3, Zongqiang Xie2, Shucun Sun1, Youbing Zhou2
1Department of Ecology, School of Life Sciences, Nanjing University, Nanjing, China
2State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China
3School of Environment, Northeast Normal University, Changchun, China
4Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania

Tóm tắt

Abstract Seed dispersal and subsequent recruitment dynamics play a crucially important role in regulating species coexistence and structuring tree diversity in diverse forests. Wildlife, which can dually shape the tree recruitment process by simultaneously functioning as natural enemies and seed dispersers, are undergoing widespread changes in population and behaviour due to the detrimental effects of expanding global road networks. However, the impact of these changes on recruitment dynamics through the alteration of seed dispersal processes remains understudied. Here, we assessed how roads affect animal‐mediated recruitment dynamics from the seed to adult stages of trees using a ubiquitous vertebrate‐seed model: rodents and acorns. To quantify the degree to which proximity to a road alters seed dispersal and regulates subsequent recruitment dynamics, we conducted seed dispersal and predation experiments, and investigated the natural recruitment of a dominant tree species (Quercus aliena) from September 2009 to July 2012 in a subtropical forest of central China. Roads caused a decreased seed dispersal distance and increasing larder hoarding, demonstrating a weakened contribution of rodents to seed dispersal services. These patterns were stronger in the masting year than in the non‐masting year. Correspondingly, seedlings, saplings and adult trees had higher densities near roads than far from roads. Near roads, recruit transition rates (i.e. seedling‐to‐sapling and sapling‐to‐juvenile) were low, and the influential strength of conspecific adult density was weakened over these recruit transitions, indicating that space limitation and lottery competition, not conspecific negative density‐dependent effects, approximately determined the near‐road recruitment process. Furthermore, most adults near roads were young, and their ages matched the road ages. Synthesis. Roads diminished animal‐mediated seed dispersal services and disrupted subsequent recruitment dynamics in Quercus aliena populations, thus weakening the key process promoting diversity in forest ecosystems. Given that these animal‐regulated roles in recruitment dynamics are widespread stabilizing forces for tree coexistence, our findings suggest that the ubiquity of roads and their continued expansion will contribute to the increase in forests dominated by a relatively low number of species. Consequently, the growing expansion of road networks will ultimately cause profound changes in community composition and structure across diverse forests worldwide.

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Tài liệu tham khảo

10.1126/sciadv.1600936

10.1002/9781118568170.ch39

10.1038/nature12911

10.1111/1365-2745.12929

10.1007/s10531-010-9791-3

10.1016/j.biocon.2010.02.009

10.1890/08-0955.1

10.1007/BF02803189

10.1098/rspb.2014.2580

10.1098/rspb.2014.2095

Chen W., 2019, Data from: Proximity to roads disrupts rodents’ contributions to seed dispersal services and subsequent recruitment dynamics, Dryad Digital Repository

10.1016/j.foreco.2017.10.008

Connell J., 1971, Dynamics of numbers in population, 298

10.1111/1365-2745.12902

10.1007/BF00317624

10.1126/science.aaf7934

10.1007/s00442-007-0928-3

10.1126/science.aaf7166

10.1111/ele.12317

10.1086/282687

10.1093/beheco/arr205

10.1146/annurev.ecolsys.33.020602.095433

10.1111/j.1365-2435.2008.01514.x

10.1126/science.aam5678

Lambert T. D., 2014, Roads as barriers to seed dispersal by small mammals in a neotropical forest, Tropical Ecology, 55, 263

10.1016/j.tree.2009.06.009

10.1111/ele.12643

10.1111/brv.12240

Liu F., 1998, Plant community and species diversity in Longmenhe region, Xingshan

10.3758/s13428-016-0809-y

10.1016/j.biocon.2016.06.024

10.1111/1365-2745.12818

10.1017/S0266467415000504

10.1111/1365-2745.12848

10.1890/06-0737.1

10.1016/j.biocon.2011.11.023

10.1007/s10980-015-0329-7

10.1016/j.tree.2015.06.009

10.1073/pnas.1522488113

10.1038/nature24038

10.1111/geb.12502

10.1111/j.2041-210X.2011.00153.x

10.2307/2255275

10.1016/j.foreco.2005.10.054

10.17520/biods.2016268

Zhong J., 2012, Diversity of small mammals among different plantations in Shennonjia, central China

Zhu H., 2011, The chronicle of Shennongjia Forestry District

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Journal of Ecology

Tập 107 Số 6

2623-2634

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