Effect of dioecy on the etructure of a population of Araucaria angustifolia (Bert.) O. Kuntze

Araucaria angustifolia (Bert.) O. Kuntze is a dioecious tree, due to the distinction between the reproductive functions of males and females, the species may have secondary sex characteristics accumulated throughout its life in variables such as diameter and height. Therefore, the present study aimed to characterize the diameter and height structure of male and female trees of the A. angustifolia species using probabilistic distribution models as well as to test the sex ratio trend throughout their distributions. A census was carried out in a ​​98-ha area located in the Campos Gerais region, in the municipality of Palmeira, state of  Parana, Brazil. In the study area, a total of 621 trees were recorded, of which 51.53 % were male and 48.47 % were female with a sex ratio of 1.06, which did not differ statistically from a hypothetical 1:1 ratio, by means of a Chi-square test. The Weber distribution was the one that showed the best fit for the diameter at breast height (DBH) of both sexes and the normal distribution showed the best fit for the height. In this study, it was observed that male trees have presented a greater reproductive effort, so they tend to be more susceptible to environmental disturbances. As A. angustifolia is a species with limitations, due to forest fragmentation and its low natural regeneration, its unequal reproductive behavior may not favor one of the sexes, nor alter the balance of the Mendelian proportion, but could compromise seed production.

• Publication year

  2025

• Venue

  Caderno Pedagógico

• Publication date

  2025-01-13

• Fields of study

  Not labeled

• Identifiers
  DOI 10.54033/cadpedv22n1-092
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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