Influences of interyear rainfall variability and microhabitat on the germinable seed bank of annual plants in a sandy Monte Desert

Quevedo-Robledo, L.; Pucheta, Eduardo; Ribas-Fernández, Yanina A.

doi:10.1016/j.jaridenv.2009.08.002

Cited by 34 publications

(26 citation statements)

References 46 publications

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“…This supports previous findings in our study area, which showed very high densities of Schismus (Pucheta et al 2011) and relatively low densities of native species (Quevedo-Robledo et al 2010). This supports previous findings in our study area, which showed very high densities of Schismus (Pucheta et al 2011) and relatively low densities of native species (Quevedo-Robledo et al 2010).…”

Section: Implications For Plant Diversity Conservationsupporting

confidence: 93%

“…Schismus barbatus is native to the winter-rainfall deserts of the Mediterranean Basin and has spread into most deserts around the globe (Brooks 2000a). Results of a preceding seed bank study in central-northern Monte Desert suggest positive effects of multi-specific shrub clusters on the native annual plant community (Quevedo-Robledo et al 2010), although species-specific influences of shrubs were not studied. Schismus barbatus has been only recently found in the central-northern Monte Desert, where it can form large non-dormant soil seed banks (Pucheta et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Schismus barbatus has been only recently found in the central-northern Monte Desert, where it can form large non-dormant soil seed banks (Pucheta et al 2011). Results of a preceding seed bank study in central-northern Monte Desert suggest positive effects of multi-specific shrub clusters on the native annual plant community (Quevedo-Robledo et al 2010), although species-specific influences of shrubs were not studied.…”

Section: Introductionmentioning

confidence: 99%

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Species‐specific influences of shrubs on the non‐dormant soil seed bank of native and exotic plant species in central‐northern Monte Desert

et al. 2012

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Deserts shrubs are well known to facilitate vegetation aggregation, mostly through seed trapping, and stress amelioration during and after plant establishment. Because vegetation aggregation effects are a by-product of shrub presence, beneficiary species may not only be native, but also exotic. However, despite the high risk that exotic invasive species pose to ecosystem services, little is known of the role of desert shrubs on plant invasions. We assessed the influence of two shrub species on the non-dormant soil seed bank (i.e. the number of seeds that readily germinate with sufficient water availability) of an invasive annual grass (Schismus barbatus) and of coexisting native species in a central-northern Monte Desert (Argentina). Soil samples were collected beneath the canopies of two dominant shrub species (Bulnesia retama and Larrea divaricata) and in open spaces (i.e. intercanopies) in May 2001. Overall, the density of germinated seedlings of Schismus and that of the native species were negatively associated across microsite types. Schismus density was similar to that of all native species pooled together (mostly annuals), and was highest in Larrea samples (with no significant differences between Bulnesia and intercanopies). On the contrary, the density of all native species pooled together was highest in Bulnesia samples. Our results suggest that shrubs may contribute to plant invasions in our study system but, most importantly, they further illustrate that this influence can be species specific. Further research is needed to assess the relative importance of in situ seed production (and survival) and seed redistribution on soil seed bank spatial patterns.

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Section: Implications For Plant Diversity Conservationsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Species‐specific influences of shrubs on the non‐dormant soil seed bank of native and exotic plant species in central‐northern Monte Desert

et al. 2012

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“…It governs the capability to trap dispersing seeds, resulting in distinct patterns of seed accumulation (Bertiller, 1998;Guo et al, 1998;Quevedo-Robledo et al, 2010). In addition, physical soil properties and low-stature natural obstructions account for much of small-scale variation in seed deposition (DeFalco et al, 2009;Reichman, 1984), which is further affected by processes like directed dispersal, granivory or decay (Kemp, 1989;Nathan and Muller-Landau, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, physical soil properties and low-stature natural obstructions account for much of small-scale variation in seed deposition (DeFalco et al, 2009;Reichman, 1984), which is further affected by processes like directed dispersal, granivory or decay (Kemp, 1989;Nathan and Muller-Landau, 2000). Temporal changes therein relate to interannual climatic variability (Quevedo-Robledo et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal variation in soil seed banks under contrasting grazing regimes following low and high seasonal rainfall in arid Namibia

Dreber

Esler

2011

Journal of Arid Environments

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a b s t r a c tIn arid rangelands, soil seed bank characteristics vary with rainfall patterns, livestock pressure and habitat heterogeneity. We investigated this issue by assessing spatio-temporal patterns in soil seed bank density and richness in a degraded (heavy grazing) and non-degraded (light grazing) Nama Karoo ecosystem. To account for variation in seed distribution, different microsites were compared, and the effect of diaspore size on the patterning analyzed. Long-term heavy grazing increased seed densities and species richness of the soil seed bank by favoring small-seeded and tiny-seeded annual species. The spatial patterning of the soil seed bank was, however, similar to that found under sustainable grazing. The overall seed distribution was dictated by the small-scale environmental heterogeneity, which interacted with diaspore size. Our results suggest that the degraded environment is still efficient in controlling secondary dispersal and retaining seeds. This is through low stature barriers like surface rocks, which replace the function of grazing-sensitive perennial grasses in trapping and storing small diaspores. Soil seed banks were persistent and accumulated readilygerminable seeds over time. Observed temporal pattern across the study sites indicates that both condition and sequence of preceding rainfall seasons are likely to have a profound effect on soil seed banks of subsequent years.

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Looks can be deceiving: ecologically similar exotics have different impacts on a native competitor

2019

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Influences of interyear rainfall variability and microhabitat on the germinable seed bank of annual plants in a sandy Monte Desert

Cited by 34 publications

References 46 publications

Species‐specific influences of shrubs on the non‐dormant soil seed bank of native and exotic plant species in central‐northern Monte Desert

Species‐specific influences of shrubs on the non‐dormant soil seed bank of native and exotic plant species in central‐northern Monte Desert

Spatio-temporal variation in soil seed banks under contrasting grazing regimes following low and high seasonal rainfall in arid Namibia

Looks can be deceiving: ecologically similar exotics have different impacts on a native competitor

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