Population viability analysis and the effects of light availability and litter on populations of Cirsium pitcheri, a rare, monocarpic perennial of Great Lakes shorelines

Jolls, Claudia L.; Marik, Julie E.; Hamzé, Samara I.; Havens, Kayri

doi:10.1016/j.biocon.2015.04.006

Cited by 15 publications

(9 citation statements)

References 75 publications

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“…Gray, or Pitcher's thistle, is endemic to dune habitats of the Great Lakes of North America, where it can be locally abundant. Globally ranked G2G3, this species is threatened by habitat conversion, invasive seed predators, inbreeding depression (Havens et al 2012, Jolls et al 2015, and climate change (Vitt et al 2010). Centaurea stoebe L., or spotted knapweed, is found in a broad range of habitats (Mr az et al 2012, Otiskova et al 2014) and has been introduced to North America multiple times, where it is considered a noxious weed in multiple localities (Marrs et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Temporal variation in the roles of exotic and native plant species in plant–pollinator networks

et al. 2020

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The role of individual plant species, including those that are rare or invasive, in the structure of plant–pollinator networks will depend on how connected the plants are to pollinator species and when they flower. Plant species visited by a high diversity of pollinators that visit few other species during a particular time period are thought to provide high value to the insect community. Here, we examined the role of plant species in a plant–pollinator network across the entire flowering season and across dune and adjacent woodland habitats in Wisconsin, USA. We found strong turnover of plants, pollinators, and their interactions in time and space. Both native and exotic species play important structural roles in plant–pollinator networks. Simulations reveal that the loss of the early‐flowering rare plant, Cirsium pitcheri, would result in a disproportionate loss of pollinator species. Furthermore, the critical role that this species plays in the network is not replaced by its exotic relative, Centaurea stoebe. Our research demonstrates that consideration of temporal and spatial variability in networks allows for critical plant species to be identified within a plant–pollinator network that might otherwise be overlooked.

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Section: Introductionmentioning

confidence: 99%

Temporal variation in the roles of exotic and native plant species in plant–pollinator networks

et al. 2020

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“…Altered disturbance regimes, such as changes in fire frequency, human land-use, and management practices, can directly influence rare plant populations by altering microsite availability, vegetation structure, soil fertility, and biotic interactions (Brys et al 2005;Menges and Dolan 1998;Middleton 2013;Vitt et al 2009). Because rare species with restricted distributions often depend on periodic disturbances to create suitable habitat, a major challenge for conservation is to understand their response to habitat change and successional processes (Jolls et al 2015;Menges and Quintana-Ascencio 2004;Pardini et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Habitat change in insular grasslands: Woody encroachment alters the population dynamics of a rare ecotonal plant

Albrecht

Becknell

Long

2016

Biological Conservation

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Inferring habitat requirements of rare plants can be challenging when the few remaining populations occur in sites with divergent successional states. In island-like rock outcrop systems within forest landscapes, edaphic conditions are assumed to modulate successional patterns, but changes to disturbance regimes in the landscape matrix could alter ecotone microenvironments over time. We used demographic surveys and controlled experiments with a dispersal-limited and endangered ecotonal plant, Astragalus bibullatus, to test the hypothesis that woody encroachment from the forest matrix threatens rare plants in globally imperiled limestone cedar glades. Tree canopy cover was more important than edaphic conditions or ground-layer structure for explaining variation in demographic structure. As tree canopy cover increased, stem densities, flowering, and seed production declined. Over three-years, per plant inflorescence production, fruit production, and fruit set were markedly greater in open microhabitats than in edge or closed microhabitats. In contrast, seedling densities peaked in edge and closed microhabitats. Seedling recruitment and seed production were spatially decoupled across a canopy cover gradient, suggesting that shaded sites historically had lower tree canopy cover. Shade reduced growth rates and biomass of seedlings and adults under nonlimiting moisture conditions. Although A. bibullatus can persist in degraded ecotones using multiple demographic strategies, growth, flowering and seed production depend on open microhabitats. Our results demonstrate that woody encroachment effects in temperate grasslands extend to island-like rock outcrop systems with unique edaphic conditions. Conservation and recovery programs with rare ecotonal plants should integrate restoration of historical disturbance regimes in the landscape matrix.

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“…In contrast, several studies 46 have documented negative effects of summer temperature on growth rates for other plant species (Aragón-Gastélum et al, 2017;Riba et al, 2002;Shryock et al, 2014). In some cases, a given 48 climatic variable has been shown to have diverging effects on separate vital rates within a species 49 life-history (Csergő et al, 2017;Jolls et al, 2015;Nicolè et al, 2011;Peñuelas et al, 2004;50 Treurnicht et al, 2016). For example, a warm summer increased the flowering probability of 51 Dracocephalum austriacum, whereas it decreased plant survival, leading to reduced effects of 52 climate on population growth rates (Nicolè et al, 2011).…”

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confidence: 94%

Predicting population viability of the narrow endemic Mediterranean plant Centaurea corymbosa under climate change

Belaid

Maurice

Fréville

et al. 2018

Biological Conservation

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6Climate change is a growing threat for global biodiversity, in particular for narrow endemic 7 species. The Mediterranean region, which harbors an exceptional biodiversity, has been identified 8 as one of the most sensitive regions to climate change. Based on a 22-year monitoring period, we 9 analyzed the dynamic and viability of the six extant populations of a narrow endemic plant species 10 of the Mediterranean area, Centaurea corymbosa, to predict their fate under two climatic scenarios. 11We constructed matrix projection models to calculate current asymptotic growth rates and to 12 perform stochastic projections including both demographic and environmental stochasticity. Neither 13 asymptotic growth rates nor their temporal variance were linked to population size and age at 14 flowering. Randomization tests showed that asymptotic growth rates were significantly different 15 among years but not among populations. An increase in temperature and a decrease in the number 16 of wet days had a negative impact on the whole life-cycle, particularly in the summer period, and 17 thus reduced asymptotic growth rates. Stochastic projections showed that an increased frequency of 18 extreme climatic events increased population extinction risk and decreased mean time to extinction. 19The warm scenario had a more dramatic impact on population viability than the dry scenario. 20Management recommendations are proposed to increase population viability of endangered plant 21 species such as C. corymbosa that face climate change. 22

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Population viability analysis and the effects of light availability and litter on populations of Cirsium pitcheri, a rare, monocarpic perennial of Great Lakes shorelines

Cited by 15 publications

References 75 publications

Temporal variation in the roles of exotic and native plant species in plant–pollinator networks

Temporal variation in the roles of exotic and native plant species in plant–pollinator networks

Habitat change in insular grasslands: Woody encroachment alters the population dynamics of a rare ecotonal plant

Predicting population viability of the narrow endemic Mediterranean plant Centaurea corymbosa under climate change

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