Male-biased effective sex ratio across populations of the threatened Zamia boliviana (Zamiaceae)

Autor: Gudryan Jackson Barônio, Fábio Pinheiro, Rosane Segalla, Leonor Patrícia Cerdeira Morellato
Přispěvatelé: Ciência e Tecnologia de Mato Grosso, Universidade Estadual de Campinas (UNICAMP), Programa de Pós-Graduação em Ciência Florestal, Universidade Estadual Paulista (Unesp)
Rok vydání: 2021
Předmět:
Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
ISSN: 1573-5052
1385-0237
DOI: 10.1007/s11258-021-01127-3
Popis: Made available in DSpace on 2021-06-25T11:13:27Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-05-01 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Populations of dioecious plants commonly exhibit dissimilarities to the equilibrium expectation of a 1:1 sex ratio. Differential expenditure for reproduction between genders is cited as the primary mechanism responsible for a male-biased sex ratio, with increased effects on long-living species, but these mechanisms are still poorly understood. We explore the sex ratio in the endemic gymnosperm Zamia boliviana (Zamiaceae) populations from the Brazilian savanna (the Cerrado). We aim to investigate what the Z. boliviana sex ratio is, and whether population density and ecological correlates lead to variation in the sex proportion among Cerrado habitats. The study was conducted on ten in situ populations of Z. boliviana at sexual maturity (tertiary sex ratio). We estimated the populations’ sex ratio and performed a redundancy analysis to assess the relationship between biotic traits, such as sex ratio, and associated environmental features. Soil texture classes were used to classify the cycad habitats and were expressed in a ternary phase diagram. The results show a significant male-biased sex ratio in seven of the ten populations surveyed. Environmental factors did not explain the redundancy in the reproductive characteristics. However, the cycad occurs in different habitats in their endemic zone. Our study provides new biological data for Z. boliviana, suggesting that the differential reproductive expenditure of sexes in reproduction is governing the mechanisms of sex ratio variation, compared to local environmental factors in this cycad. The pattern of effective sex ratio found here improves our understanding of mechanisms causing biased sex ratios in cycads and other dioecious species from tropical ecosystems. Instituto Federal de Educação Ciência e Tecnologia de Mato Grosso Campus Cáceres–Prof. Olegário Baldo, Avenida Europa, nº 3000, Vila Real/Distrito Industrial Departamento de Biologia Vegetal Instituto de Biologia Universidade Estadual de Campinas Universidade Federal dos Vales do Jequitinhonha e Mucuri Programa de Pós-Graduação em Ciência Florestal, Campus JK, Rodovia MGT 367 - Km 583, nº 5.000, Alto da Jacuba Laboratório de Fenologia Departamento de Biodiversidade Instituto de Biociências Universidade Estadual Paulista UNESP Laboratório de Fenologia Departamento de Biodiversidade Instituto de Biociências Universidade Estadual Paulista UNESP
Databáze: OpenAIRE
Externí odkaz: