Inferring population trends of<i>Araucaria angustifolia</i>(Araucariaceae) using a transition matrix model in an old-growth forest

Paludo, Giovani Festa; Lauterjung, Miguel Busarello; Reis, Maurício Sedrez dos; Mantovani, Adelar

doi:10.2989/20702620.2015.1136506

Cited by 17 publications

(14 citation statements)

References 33 publications

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“…The average of these matrices (three) generated the transition matrix used for the analysis ( Fig. 4; see Paludo et al 2016). Mortality rate (D) was estimated for each class as follows: D = 1 -S -G. Fecundity was estimated based on the number of recruits found in the central plot between 2013 and 2016, divided by the number of RP individuals found inside the same central plot, and multiplied by the probability of remaining in the same RP class for each assessed year (Caswell 2001).…”

Section: Data Collection and Analysismentioning

confidence: 99%

Population dynamics of Podocarpus lambertii in southern Brazilian forest–grassland mosaics

et al. 2019

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The grasslands conversion to forests is occurring globally and modifying the population dynamics of species. Here, we characterized the population dynamics of Podocarpus lambertii Klotzsch ex Endl. over four years in southern Brazilian forest–grassland mosaics. We asked (i) if the studied P. lambertii population would decrease or increase over time and (ii) what the role of forest patches is in the growth and recruitment of a P. lambertii population. Thus, we studied forest–grassland mosaics, stratified the population into four demographic classes, evaluated the population dynamics, and estimated the correlation between canopy cover and average number of individuals. All individuals of P. Lambertii occurred in forest patches. Density was high but decreased from seedlings to the reproductive stage. The population growth rate was λ = 1.025, and the recruitment of individuals was high and variable among years. The transition and mortality rates showed a pattern of reduction from seedlings to the reproductive stage. Mortality rate for seedlings and juveniles was low and concentrated at the smaller heights. The correlations between canopy cover and the average number of individuals were positive and significant. The ecological characteristics of this species and specific conditions provided by forest patches allow population growth and species conservation in the southern Brazilian forest–grassland mosaics.

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Section: Data Collection and Analysismentioning

confidence: 99%

Population dynamics of Podocarpus lambertii in southern Brazilian forest–grassland mosaics

et al. 2019

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“…Because of their longevity and large sizes, conifers remain dominant in these forests for long time periods (frequently centuries, Oliveira et al 2010), although demographically functioning as remnant populations that lack sufficient regeneration. While substantial evidence supports the regeneration D r a f t 18 component of this model (Duarte and Dillenburg 2000, Souza et al 2008, Steward and Beveridge 2010, Paludo et al 2016, our understanding of the demography of adult trees is limited.…”

Section: Discussionmentioning

confidence: 93%

“…Long-lived groups such as conifers may present negligible growth and mortality over the few years during which most research projects carry out demographic monitoring (Silva et al 2009, Beckert et al 2014, Paludo et al 2016). Dendroecological studies span longer time-scales but do not allow for the assessment of survivorship or its relationship with habitat variables like forest patch size.…”

Section: Discussionmentioning

confidence: 99%

“…However patterns can be missed because of insufficient sample size or time interval. Only a minority of studies have carried out demographic monitoring for more than a few years, while long-lived groups like conifers may experience negligible growth and mortality over short time scales (Beckert et al 2014, Paludo et al 2016. Dendrochronological analyses (e.g., Silva et al 2009) allow for long-term assessment of growth patterns, but cannot provide information on survivorship or on ecological determinants of growth other than climatic variables.…”

Section: Introductionmentioning

confidence: 99%

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Conifer demography in forest–grassland mosaics: a landscape-scale study over a 24-year period

Souza

2017

Botany

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Survivorship was higher in forest patches than in grasslands, where it showed densitydependence. In forest patches, survivorship was positively related to both patch area and distance from forest edge. Crown breakage was more common in the grassland than in forest patches. In forest patches, it was positively related to crown size, number of conspecific neighbours, and patch area. Adult Araucaria seem to benefit from angiosperm-dominated neighbourhoods relative to isolation in grasslands. Densitydependent effects, known to be widespread among seeds and seedlings, were shown to be important to adult trees as well.

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“…Kuntze, 1898] is an endangered tree species of the Mixed Ombrophilous Forest, commonly known as "Mata das Araucárias," located in southern and the southern east of Brazil and in portions of Argentina and Paraguay [1,2]. The araucaria is a dioecious plant, and its propagation by seeds (pinhões) is conditioned to the existence of intraspecific genetic richness in natural habitat.…”

Section: Introductionmentioning

confidence: 99%

Colonization and Spore Richness of Arbuscular Mycorrhizal Fungi in Araucaria Nursery Seedlings in Curitiba, Brazil

Vilcatoma-Medina

Kaschuk

Zanette

2018

International Journal of Agronomy

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Araucaria or Paraná pine [Araucaria angustifolia (Bertol.) Kuntze, 1898] is an endangered timber tree species of Atlantic Forest that naturally forms symbiosis with arbuscular mycorrhizal fungi (AMF). The objective of this experiment was to evaluate AMF colonization and spore AMF richness in araucaria seedlings produced in nursery at the metropolitan region of Curitiba, Brazil, with the interest of identifying a taxonomical AMF group. For that, soil and fine roots of 6-month-, 1-year-, 2-year-, 3-year-, and 5-year-old araucaria seedlings were sampled and evaluated. Evaluations indicated that araucaria seedlings were well colonized by AMF (with rates varying from almost 50 to over 85%) and produced an abundant number of mycorrhizal spores (from 344 to 676 spores per seedling). Samples contained spores of the species Acaulospora scrobiculata, Dentiscutata heterogama, and Glomus spinuliferum and unidentified species of genera Gigaspora and Glomus. The Glomus genus was the most abundant kind of AMF spores found under nursery conditions. Therefore, the experiment evidenced that Glomus is a promising genus candidate for being used as AMF inoculant in production of araucaria seedlings.

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Inferring population trends ofAraucaria angustifolia(Araucariaceae) using a transition matrix model in an old-growth forest

Cited by 17 publications

References 33 publications

Population dynamics of Podocarpus lambertii in southern Brazilian forest–grassland mosaics

Population dynamics of Podocarpus lambertii in southern Brazilian forest–grassland mosaics

Conifer demography in forest–grassland mosaics: a landscape-scale study over a 24-year period

Colonization and Spore Richness of Arbuscular Mycorrhizal Fungi in Araucaria Nursery Seedlings in Curitiba, Brazil

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