Fine-scale spatial genetic structure in two Mexican cycad species Dioon caputoi and Dioon merolae (Zamiaceae, Cycadales): Implications for conservation

Cabrera-Toledo, Dánae; González‐Astorga, Jorge; Flores-Vázquez, Juan Carlos

doi:10.1016/j.bse.2011.09.004

Cited by 17 publications

(11 citation statements)

References 38 publications

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“…Similar levels of relatedness between D. caputoi and D. planifolium were found only in contrasting distance classes ( r ij = 0.407, 30–35 m vs. r ij = 0.413, 5–10 m, respectively). It is remarkable that our results are consistent with those inferred using different markers; Cabrera‐Toledo, González‐Astorga, and Flores‐Vázquez () calculated a genetic neighbourhood size of 30–35 m for the same population of D. caputoi using allozymes. This probably reveals a relict of a spatially wider genetic neighbourhood in the D. caputoi population at local scale.…”

Section: Discussionsupporting

confidence: 90%

Surviving background extinction: Inferences from historic and current dynamics in the contrasting population structures of two endemic Mexican cycads

et al. 2018

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Ecological and microevolutionary perspectives were used to investigate signs of background extinction in two endemic species. We studied relict populations of the cycad Dioon caputoi, contrasting its population structure and neighborhood size with those of Dioon planifolium as a demographically healthier reference population. Population dynamics analysis was performed on two populations of D. caputoi through Integral Projection Models and genetic neighborhoods compared between species through 172 Inter Simple Sequence Repeat loci performed in one population of each of the two study species. The D. caputoi populations mostly comprised adult plants, while D. planifolium presented mainly juvenile individuals. Dioon caputoi showed equilibrium in population growth (i.e., λ ≈ 1), with low recruitment, and its genetic neighborhood revealed highly related individuals in a unique distance class (r ij = 0.407, 33 m). A contrasting pattern was found in D. planifolium, which showed higher relatedness in the first distance class (r ij = 0.543, 5 m), gradually decreasing to 20 m. The discrepancies between the two species reflect different strategies of persistence. Dioon caputoi conserves a relict dynamics with signs of a multigenerational, attritional loss of reproductive fitness, while D. planifolium does not. This study furthers our understanding of the background extinction process and the information will thus contribute to the management and conservation of this endangered species. K E Y W O R D Sbackground extinction, cycad demography, Dioon, dispersion, Tehuacán-Cuicatlán biosphere reserve

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Section: Discussionsupporting

confidence: 90%

Surviving background extinction: Inferences from historic and current dynamics in the contrasting population structures of two endemic Mexican cycads

et al. 2018

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“…1). Dioon merolae grows in warm humid and sub‐humid climates in the Mexican States of Oaxaca and Chiapas (Cabrera‐Toledo et al , 2010, 2012). In the State of Oaxaca it grows on the Sierra Madre del Sur where it is separated orographically from D. rzedowskii De Luca, Moretti, Sabato & Vázquez‐Torres, D. purpusii Rose, D. califanoi De Luca & Sabato and D. spinulosum Dyer which grow on the inner mountains of the Sierra del Norte (De Luca et al , 1981).…”

Section: Introductionmentioning

confidence: 99%

Molecular evidence of cycad seed predation by immature Aulacoscelidinae (Coleoptera: Orsodacnidae)

Prado

McKenna

Windsor

2012

Systematic Entomology

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Adult beetles in the small subfamily Aulacoscelidinae (superfamily Chrysomeloidea) are known to feed on the foliage and juices of New World cycads (Order Cycadales; family Zamiaceae), but the habits of larvae have long remained a mystery. We provide the first direct evidence that Aulacoscelidinae larvae feed on and develop within the megagametophyte of the Mesoamerican cycad, Dioon merolae (Zamiaceae). Phylogenetic analyses based on partial DNA sequences from 3 genes recover a cycad seed‐feeding larva proposed to belong to Aulacoscelidinae. These observations reveal a more intimate feeding relationship between Aulacoscelidinae and their New World cycad host plants than was previously recognized. Further, adult Aulacoscelidinae have long been noted to resemble Jurassic fossil chrysomeloids in the extinct subfamily Protoscelidinae. The molecular, morphological, ecological and fossil data reported herein are broadly compatible with an early association between Aulacoscelidinae and their gymnosperm hosts.

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“…Hypothesizing that the toxicity of cycad seeds may be precluding dispersal by frugivores over long distances (Hall & Walter 2013). A lack of dispersal may lead to small, isolated populations which in turn can be subject to localized extinction due to inbreeding depression (Gonz alez- Cabrera-Toledo et al 2012). Furthermore, poor dispersal mechanisms will likely preclude migration in response to a changing climate therefore forcing cycads to persist and adapt in situ (Bitencourt et al 2016;Aguirre et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Investigating the demographics and intrapopulation spatial patterns of the endangered Cycas megacarpa K.D.Hill in central Queensland, Australia

Etherington¹,

Jeffers²,

Grigg³

et al. 2017

Austral Ecology

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Cycads are threatened globally due to land clearing and unsustainable harvesting impacting upon long-living mature plants that are essential for population viability. Cycas megacarpa K.D.Hill is an endangered cycad endemic to central Queensland, Australia. Populations of this species have been impacted by recent infrastructure projects resulting in translocation of individuals to ameliorate losses. Translocations require an understanding of the species demographics and intrapopulation spatial distributions to inform planting design. This project studied the demography and spatial patterns of a population of C. megacarpa (%5600 individuals) within a 96.3 ha area in central Queensland to design a translocation planting that replicates a healthy population. Descriptive statistics were used to analyse the demography of the population. Spatial Point Pattern Analyses (SPPA) were used to determine if the population's spatial arrangement departed from complete spatial randomness across height, gender classes and between female and juvenile cycads. We found this population to possess a 1:1 ratio of male and female cycads. However, male C. megacarpa were on average %0.5 m shorter than female cycads and reached reproductive maturity at shorter heights. SPPA found this population of C. megacarpa to be clustered irrespective of height or gender. A significant spatial relationship was detected between female and juvenile cycads. The results of this study suggest that to replicate a healthy C. megacarpa population, the translocated cycads could be planted in a clustered spatial pattern with known male and female individuals distributed through the clusters at a 1:1 ratio.

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Fine-scale spatial genetic structure in two Mexican cycad species Dioon caputoi and Dioon merolae (Zamiaceae, Cycadales): Implications for conservation

Cited by 17 publications

References 38 publications

Surviving background extinction: Inferences from historic and current dynamics in the contrasting population structures of two endemic Mexican cycads

Surviving background extinction: Inferences from historic and current dynamics in the contrasting population structures of two endemic Mexican cycads

Molecular evidence of cycad seed predation by immature Aulacoscelidinae (Coleoptera: Orsodacnidae)

Investigating the demographics and intrapopulation spatial patterns of the endangered Cycas megacarpa K.D.Hill in central Queensland, Australia

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