Publication Details

Category Text Publication
Reference Category Journals
DOI 10.3732/ajb.1600290
Title (Primary) Effects of seed density and proximity to refuge habitat on seed predation rates for a rare and a common Lupinus species
Author Pardini, E.A.; Patten, M.V.; Knight, T.M.
Source Titel American Journal of Botany
Year 2017
Department BZF; iDiv
Volume 104
Issue 3
Page From 389
Page To 398
Language englisch
Keywords apparent competition; congeneric comparisons; Lupinus; plant height , Point Reyes National Seashore; rodent seed predation; seed density; seed size
UFZ wide themes RU1;

PREMISE OF THE STUDY: Biotic interactions such as seed predation can play a role in explaining patterns of abundance among plant species. The effect of seed predation will depend on how the strength of predation differs across species and environments, and on the degree to which seed loss at one life-cycle phase increases fitness at another phase. Few studies have simultaneously quantified predispersal and postdispersal predation in co-occurring rare and common congeners, despite the value of estimating both for understanding causes of rarity.

METHODS: We quantified predispersal seed predation on the rare, herbaceous species Lupinus tidestromii (Fabaceae) and its common, shrubby congener L. chamissonis across multiple years in the same community. We experimentally measured postdispersal seed predation at two seed densities and locations near or far from an exotic grass housing high densities of deer mice (Peromyscus maniculatus), their primary, native seed predator.

KEY RESULTS: The common L. chamissonis had the lowest predispersal seed predation of the two lupine species, potentially because of its height: its high racemes received less predation than those low to the ground. By contrast, the same species experienced higher postdispersal seed predation, and at predators traveled long distances away from refuge habitat to consume their seeds. Across both plant species, mice preferentially predated high-density seed sources.

CONCLUSIONS: Our results show differences in the magnitude and direction of seed predation between the species across different life-cycle phases. We demonstrated possible roles of proximity to refuge habitat, seed density, and seed size in these patterns. Congeneric comparisons would benefit from a comprehensive framework that considers seed predation across different life-cycle phases and the environmental context of predation.

Persistent UFZ Identifier
Pardini, E.A., Patten, M.V., Knight, T.M. (2017):
Effects of seed density and proximity to refuge habitat on seed predation rates for a rare and a common Lupinus species
Am. J. Bot. 104 (3), 389 - 398 10.3732/ajb.1600290