Rodent-mediated plant community competition: what happens to the seeds after entering the adjacent stands?

Abstract

Background Seed dispersal by scatter-hoarding animals can affect the developmental dynamics of plant communities. However, how animals might participate in plant inter-community competition has rarely been investigated. Forest community junction is an area where the competition between plant communities is most prominent and animal activity is more frequent. At present, little is known about how scatter-hoarding animals might assist competitions by adjacent plant communities. Thus, for 3 years (2015–2017), we tracked the fate of 2880 tagged seeds (Quercus aliena var. acuteserrata, Pinus tabuliformis, and P. armandii seed) placed near an edge where the forest composition changes from a pine forest to an oak forest in northwestern China. Results We found that the seed fates differed when Quercus and Pinus seeds entered adjacent stands. In contrast to Pinus seeds, acorns that entered pine forests were characterized by higher caching rates and longer dispersal distances. Pinus seeds had the highest probability of being predated (85%) by rodents, and eleven Q. aliena var. acuteserrata seedlings were established in pine forests, although none survived in the later stages. In addition, rodents exhibited obvious selectivity in terms of the microhabitats for the seed caching sites. Conclusions Seed fates differed when Quercus and Pinus seeds entered adjacent stands. The predation pressure by rodents on the seeds of Pinus species limited the germination of seeds and seedling establishment in oak forests. The different seed fates after their bidirectional dispersal could affect the differences in natural regeneration between pine and oak forests, and they might increase the recruitment rates for oak at the edge of an adjacent community. Rodent-mediated seed dispersal could potential unintentionally affect the competition between plant communities.

Preferences of rodent scatter-hoard and predators determine dissemination oak species.

“…For this reason, this species of acorns is the most transported to caches (Lu and Zhang 2004;Lichti et al 2020). This means that it is the most favored in the dispersal process (Correa and Uriarte 2013; Wang et al 2014b;Kang et al 2020). But this acorn specie has a problem, which also attracts the attention of the predatory specie in this study (Common vole) more intensely than other acorn species with lower nutrient concentrations (Lichti et al 2020) (Fig.…”

Plant–rodent interactions after a heavy snowfall decrease plant regeneration and soil carbon emission in an old-growth forest

“…Rodents strongly affect plant regeneration and community composition in forest ecosystems by their scatterhoarding of seeds and by changing plant-plant interactions (Kang et al 2020;Yang et al 2020). In the current study, we examined the indirect effects of rodents on carbon emission from soil after a heavy snowfall.…”

Effects of Thinning Intensity on Litterfall Production, Soil Chemical Properties, and Fine Root Distribution in Pinus koraiensis Plantation in Republic of Korea

“…Generally, broadleaf species also have better regenerative traits compared with many pine species because they can generally regenerate in various ways, such as stumps, root systems, and acorns, which are effective for seed dispersal [39][40][41]. Despite limited light availability due to the dense pine canopy at CON, broadleaf species were able to regenerate successfully, resulting in an increased litter input.…”