Challenges to Introducing and Managing Disturbance Regimes for Holocarpha macradenia, an Endangered Annual Grassland Forb

  title={Challenges to Introducing and Managing Disturbance Regimes for Holocarpha macradenia, an Endangered Annual Grassland Forb},
  author={Karen D. Holl and Grey F. Hayes},
  journal={Conservation Biology},
Abstract:  Introducing rare plants to new sites for conservation to offset effects of habitat destruction requires detailed knowledge of habitat requirements, plant demography, and management needs. We conducted a factorial experiment replicated at three coastal prairie sites to test the effects of clipping frequency and litter accumulation on seed germination, seedling survival, reproduction, and seedling recruitment of introduced populations of the endangered, tall‐stature, annual forb… 
Restoring Populations of the Endangered Plant Scorzonera humilis: Influence of Site Conditions, Seed Source, and Plant Stage
It is suggested that transplanting young plants could be a much more effective and faster way to establish new populations than sowing seeds, and genotype by environment interactions and genetic differentiation among populations are indicated.
Manipulating disturbance regimes and seeding to restore mesic Mediterranean grasslands
Managing disturbance regimes alone is insufficient to restore native species guilds in highly-invaded grasslands and seeding native species has highly variable success.
Seed banks in plant conservation: Case study of Santa Cruz tarplant restoration
Restoration demography: a 10-year demographic comparison between introduced and natural populations of endemic Centaurea corymbosa (Asteraceae)
Overall, survival rates were higher in the introduced than in the natural populations, either due to better habitat conditions at the cliff scale or to better conditions in microsites selected for seed.
Habitat Restoration as a Recovery Tool for a Disturbance-Dependent Butterfly, The Endangered St. Francis’ Satyr
Insightful insights are presented into the challenges of creating and maintaining restored habitat for a species dependent on frequent disturbance, the results of experimental testing of demographic success, and the complexities in carrying out a captive rearing program.
Establishment success and persistence of threatened plant translocations in south west Western Australia: an experimental approach
Investigation of the effect of three post planting techniques on the survival and growth of six translocated threatened plant species in south-west Western Australia showed that both fencing and supplementary summer watering were two very effective approaches for enhancing seedling establishment and plant persistence.
Two decades of demography reveals that seed and seedling transitions limit population persistence in a translocated shrub
Increased the number of disturbance events in populations, even severe disturbances that almost extirpate populations, significantly increases longer-term population persistence and Seedling establishment is promoted by recent disturbance.
Conservation of a Critically Endangered Endemic Halophyte of West Portugal: A Microcosm Assay to Assess the Potential of Soil Technology for Species Reintroduction
The soil system has been frequently overlooked during plant reintroduction planning and practice since working with soils and plant roots can be difficult, particularly in saline environments.
Restoration demography and genetics of plants: when is a translocation successful?
The ways translocations have been evaluated at various stages during the process of restoration are considered, with genetic issues are paramount, as restorationists need to consider inbreeding depression, reproductive viability, local adaptation, and evolutionary potential of translocated populations.


Demographic variation and population viability in Gentianella campestris: effects of grassland management and environmental stochasticity
Traditional grassland management is more favourable for G. campestris than the methods that prevail in Scandinavia today, and this indicates a serious conservation problem, because grazing has replaced traditional management in many of the remaining semi-natural grasslands throughout Europe.
Site-specific responses of native and exotic species to disturbances in a mesic grassland community
Treatment response of some plant guilds differed among sites, highlighting the importance of replicating experiments at several sites before recommending conservation manage- ment practices.
Reducing Competitive Suppression of a Rare Annual Forb by Restoring Native California Perennial Grasslands
Results of this research suggest that restored native perennial grasslands at intermediate densities have a high habitat value for the potential establishment of the native annual A. grandiflora.
Contrasting litter effects on old field tree germination and emergence
Litter may contribute to the slow rate of tree invasion and the low probability of tree establishment in old fields, but old field litter studies taken together point to the difficulty in drawing general conclusions about any ‘net effect’ of litter on old field tree establishment.
Effects of Temporal Variability on Rare Plant Persistence in Annual Systems
It is concluded that contrary to conventional predictions of conservation and population biology, yearly fluctuations in climate may be essential for the persistence of rare species in invaded habitats.
Effects of rainfall variability and gopher disturbance on serpentine annual grassland dynamics
We studied the dynamics of a serpentine annual grassland in northern Cal- ifornia in relation to disturbance by pocket gophers (Thomomys bottae) and interannual variation in rainfall over the period
Modulation of diversity by grazing and mowing in native tallgrass prairie
Mowing or the reestablishment of grazing in anthropogenically stressed grasslands enhanced biodiversity, particularly on burned and fertilized treatments.
What is a Safe Site?: Neighbor, Litter, Germination Date, and Patch Effects
Variation in patch favorableness must prevent populations from reaching a stable spatial distribution and from reach a stable age distribution in any given patch, according to the rank order of quadrat favorability for seedlings.