Comparative demography of a rare species in Florida scrub and road habitats

Quintana‐Ascencio, Pedro F.; Weekley, Carl W.; Menges, Eric S.

doi:10.1016/j.biocon.2007.02.009

Cited by 36 publications

(44 citation statements)

References 36 publications

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“…Nonetheless, species responding to indirect fire-related germination cues, such as light increase from vegetation removal, may still find refuges from local extinction in habitats where disturbances such as shrub slashing mimic the fire effect of elimination of the aboveground vegetation (Pavlovic 1994;Quintana-Ascencio et al, 2007). At the same time, anthropogenic disturbances that prevent natural habitat succession (e.g., vegetation clearance) and therefore allow for multiple recruitment events of post-fire specialists may affect not only the distribution but also the age structure of otherwise cohort-pulsed populations (Quintana-Ascencio et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Local-scale disturbances can benefit an endangered, fire-adapted plant species in Western Mediterranean heathlands in the absence of fire

Paniw

Salguero‐Gómez

Ojeda

2015

Biological Conservation

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Section: Introductionmentioning

confidence: 99%

Local-scale disturbances can benefit an endangered, fire-adapted plant species in Western Mediterranean heathlands in the absence of fire

Paniw

Salguero‐Gómez

Ojeda

2015

Biological Conservation

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“…At a regional scale, habitat‐specific heterogeneity can be caused by unique conditions related to topography, climate, or disturbance level (Traveset et al . 2003; Quintana‐Ascencio et al . 2007; Zavaleta et al .…”

Section: Introductionmentioning

confidence: 99%

Spatial patterns of recruitment in Mediterranean plant species: linking the fate of seeds, seedlings and saplings in heterogeneous landscapes at different scales

2008

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Summary 1.Plant recruitment is a multiphase process that takes place in environments that are heterogeneous in space and time. In this work, I analyse how environmental heterogeneity in Mediterranean forests affects dynamics of early recruitment at different scales, using the wind-dispersed tree Acer opalus subsp. granatense as a case study. 2. Seed dispersal and viability, post-dispersal predation, seedling emergence and seedling and sapling survival were evaluated in different habitats (regional scale) and microhabitats (local scale). Simultaneously, a review of the literature on spatial dynamics of plant recruitment in Mediterranean systems was conducted to look for general patterns and investigate their fit to the Acer system. Nineteen woody and herbaceous species were included in the review. 3. At the regional scale, Acer recruitment dynamics strongly converged among sites of the same habitat. This was mainly due to large seedling emergence and survival differences among habitats. Although most of the studies reviewed analyzed only one site per habitat type, they also support strong regional variation (either site-or habitat-specific) in recruitment patterns. 4. At the local scale, Acer recruitment was microhabitat-specific, a result shared by almost all the reviewed species independently of their life form and dispersal syndrome. This was mostly due to spatial differences in seed arrival (higher under conspecifics) and seedling survival (higher under nurse shrubs). 5. Spatial discordance among seed rain and recruitment was found in 60% of the reviewed species at the regional scale, and in 67% at the local scale. Acer results supported this predominant lack of concordance. Discordance among seed rain and recruitment suggests that regeneration is largely limited by safe sites than by seed availability. Because seedling survival was the limiting process with a larger impact on the magnitude and spatial pattern of recruitment, safe sites might be defined as those where seedlings have a higher survival probability. 6. Synthesis : This study indicates that the influence of seed dispersal on the spatial patterns and demography of plant species could be limited in heterogeneous and stressful environments (as are found in the Mediterranean), where recruitment is restricted to a small fraction of the landscape. If we are to preserve the distribution and abundance of Mediterranean species in the face of environmental changes, we need to explicitly consider the strong patch-specificity that characterizes their recruitment process at all scales.

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“…The origin of new V. calaminaria habitat is the result of human activities and habitat quality could thus differ between recent and ancestral populations (Quintana-Ascencio et al, 2007). Nevertheless, differences in vegetation structure that could lead to difference of reproductive success between recent and ancestral populations were not observed.…”

Section: Impact Of Population Originsmentioning

confidence: 97%

“…In recently founded population, reproductive success can be reduced as a result of founder effect (Nei et al, 1975;Leimu & Mutikainen, 2005), but rapid growth of populations associated with high gene flow between populations can reduce the impacts of these effects (Leimu & Mutikainen, 2005). Furthermore, habitat quality in a recently established population may differ from an ancestral habitat and subsequently affect the reproductive success of rare endemic species (Brock et al, 2007;Quintana-Ascencio et al, 2007). Colonisation of new habitats by maladapted genotypes can lead to a reduction in the number of individuals until the population reaches extinction (Pulliam, 1988).…”

Section: Introductionmentioning

confidence: 99%

Conservation of an endemic metallophyte species: Effect of population history and vegetative density on the reproductive success of Viola calaminaria

Bizoux

Cristofoli

Piqueray

et al. 2011

Journal for Nature Conservation

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Demographic studies that monitor population dynamics are an essential component in establishing conservation strategies. The conventional view that human disturbance results in negative effects to species and habitats is countered by the fact that some anthropogenic activities result in the origin of new habitat opportunities for species. Faced with an increase in European restoration programs, studies that assess the variability in traits conferring reproductive success among populations is particularly relevant to rare species conservation and further improves our knowledge to achieve restoration success. In the present study, we evaluated reproductive success variation (flower density, percent fructification and seed set) in Viola calaminaria, a rare endemic metallophyte, in relationship to population origins (ancestral or recent habitat), plant density and habitat structure. Results indicated that seed set varied significantly among ancestral and recently established populations, with recent populations exhibiting increased seed set (P < 0.05). Habitat structure did not influence species reproductive success. A positive significant correlation was detected between vegetative and flower density (P < 0.001). Results suggested that population origin (ancestral or recent) and local vegetative density was more important than habitat structure on reproductive success in Viola calaminaria. In addition, we demonstrated that Viola calaminaria populations distributed in habitats recently created by anthropogenic activity exhibited similar or higher reproductive success than populations from ancestral sites. These results are noteworthy as they show that anthropogenic activities can create new favourable habitats for some rare species.

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Comparative demography of a rare species in Florida scrub and road habitats

Cited by 36 publications

References 36 publications

Local-scale disturbances can benefit an endangered, fire-adapted plant species in Western Mediterranean heathlands in the absence of fire

Local-scale disturbances can benefit an endangered, fire-adapted plant species in Western Mediterranean heathlands in the absence of fire

Spatial patterns of recruitment in Mediterranean plant species: linking the fate of seeds, seedlings and saplings in heterogeneous landscapes at different scales

Conservation of an endemic metallophyte species: Effect of population history and vegetative density on the reproductive success of Viola calaminaria

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