Trade-off between seed defensive traits and impacts on interaction patterns between seeds and rodents in forest ecosystems
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Plants often have two kinds of defensive traits against animal predation: physical and chemical defenses, but the trade-off between them is heavily debated, and their impacts on relationship between plants and animals are largely unknown. We investigated seed traits of 23 tree species and their impacts on seed fates or hoarding behaviors under predation from 16 rodent species in four forest types in China. We provide clear evidence that there is a strong nonlinear trade-off between physical (as measured by seed coat thickness) and chemical (as measured by tannin content) defensive traits in seeds. This trade-off was closely associated with nutritional traits, resulting in coordinated defense syndromes in seeds. The seed fate and hoarding behavior patterns were largely determined by the trade-off-related seed traits and the body mass of rodents, respectively, not by the phylogenetic relations of species. Tree species showed more conservative evolution in seed traits of high starch content, high tannin content, and thin seed coat, but they showed more convergent/divergent evolution in seed traits of high protein content, high fat content, and thick seed coat under rodent predation. Our results suggest that trade-off-related seed traits may play a predominant role in shaping the relationship between plants and animals.
KeywordsTrade-off Physical and chemical defense Phylogenetic distance Evolution Plant-animal interactions
This work is partially supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB11050300), the grants of National Natural Science Foundation of China (30930016, 31330013, 31372212), the Knowledge Innovation Program of Chinese Academy of Sciences (KSZD-EW-TZ-008; CXTDS2005-4), and the National Basic Research Program of China (2007CB109101; 2012CB955504). We are grateful to Prof. Marcel Holyoak, University of California, for his valuable comments to this manuscript. We thank Mr. Yunfa Xiao and Xunlong Wang for the field assistances in rodent capture in Dujiangyan region.
- Bascompte J, Jordano P (2014) Mutualistic networks. In: Leven SO, Horn HS (eds) Monographs in population biology, vol 53. Princeton University Press, PrincetonGoogle Scholar
- Izhaki I (2002) The role of fruit traits in determining fruit removal in East Mediterranean ecosystems. In: Levey DJ, Silva WR, Galetti M (eds) Seed dispersal and frugivory: ecology, evolution, and conservation. CABI Publishing, Wallingford, pp 161–175Google Scholar
- Lebreton P (1982) Tanins ou alcaloïdes: deux tactiques phytochimiques de dissuasion des herbivores. Rev Ecol (Terre Vie) 36:539–572Google Scholar
- Li J, Liu J (2003) Ecological implication and behavior mechanism of food selection of mammalian herbivores. Chin J Appl Ecol 14:439–442Google Scholar
- Lu JQ, Zhang ZB (2007) Hoarding of walnuts by David’s rock squirrels (Sciurotamias davidianus) within enclosure. Acta Theriol Sin 27:209–214Google Scholar
- R Core Team (2014). R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna. http://www.R-project.org/.
- Reece JB, Campbell NA, Urry LA et al (2010) Cambell biology, vol 9. Pearson, San FranciscoGoogle Scholar
- Xiao ZS, Wang YS, Zhang ZB (2001) Seed bank and the factors influencing it for three Fagaceae species in Dujiangyan Region, Sichuan. Biodivers Sci 9:373–381 (In Chinese with English abstract) Google Scholar
- Xiao ZS, Zhang Z, Wang Y (2002) Rodent’s ability to discriminate weevil-infested acorns: potential effects on regeneration of nut-bearing plants. Acta Theriol Sin 23:312–320Google Scholar
- Yang XP, Xiao YX (2002) Animal Physiology. Higher Education Press, BeijingGoogle Scholar
- Zhang Z, Wang F (2000) Effect of burial on acorn survival and seedling recruitment of Liaodong oak (Quercus liaotungensis) under rodent predation. Acta Theriol Sin 21:35–43Google Scholar