Genetic and ecological niche modeling of Calydorea crocoides (Iridaceae): an endemic species of Subtropical Highland Grasslands

Abstract

Evolutionary analyses have been widely used for evaluation of genetic diversity of natural populations and correlate these data to the fitness of the species, especially in the case of threatened species. Calydorea crocoides occurs in a restricted area at altitudes from 800 to 1500 m in southern Brazil and is considered endangered. A study assessing genetic diversity, cytogenetic features and ecological niche was performed aiming to characterize C. crocoides by multidisciplinary approaches. Molecular data highlighted that most of the total variation (76%; p < 0.001) was found within populations and the parameters of genetic diversity were high at the species level (PPB = 98.97%; I = 0.4319; h = 0.2821). Gene flow (Nm) was estimated in 0.97 individuals per generation. Cytogenetically, C. crocoides presents a bimodal karyotype and low asymmetry. DAPI banding pattern was uniform, but the CMA-signal evidenced a pericentric inversion in the population ESC688. The species presents high pollen viability and two different morphologies of pollen grains. Our data showed high levels of polymorphism maintained in this species that could ensure conservationist practices in which the main goal is to preserve the evolutionary potential of the species through the maintenance of genetic diversity.

IAPT chromosome data 40

“…For chromosome counting, root tips were pretreated with 8-hydroxyquinoline for 24 h at 8°C and fixed with 3 : 1 ethanol : glacial acetic acid. Slides were prepared according to and Alencar & al. (2018).…”

Atributos ecológicos e modelagem de nicho climático de Allagoptera brevicalyx Moraes, espécie ameaçada de extinção

“…A modelagem de nicho climático é uma técnica que utiliza algoritmos para correlacionar dados de ocorrência de uma espécie com variáveis bióticas e abióticas com intuito de identificar áreas potenciais para ocorrência do táxon avaliado (Anderson et al, 2003;Guisan & Zimmermann, 2000;Montoya et al, 2012). Essa é uma técnica que apresenta diversas aplicabilidades (Contreras-Medina et al, 2010;Guisan & Zimmermann, 2000;Rodrigues et al, 2015;Vieira et al, 2015) e dentre elas é possível destacar sua utilização para identificar novas populações de uma espécie (Alencar et al, 2018;Marcer et al, 2013) ou como passo inicial para criação de áreas para a sua conservação (Koch et al, 2017).…”

MODELING THE POTENTIAL DISTRIBUTION OF Anamaria heterophylla (GIUL. & V.C. SOUZA) V.C. SOUZA (PLANTAGINACEAE) IN THE CAATINGA

“…Species distribution modeling is a procedure by which a mathematical algorithm optimizes (correlates) the occurrence sites of a target species with environmental information from these sites and, as a product of these correlations, indicates suitable environments for the species' survival (Anderson et al 2003, Guisan & Thuiller 2005. Among the studies that use SDM in the context of conservation biology, those that can identify new populations of rare, endemic and/ or threatened species from model-predicted areas are of particular relevance (Araújo & Williams 2000, Engler et al 2004, Hassemer et al 2015, Alencar et al 2018.…”