Abstract
Astrocaryum vulgare Mart. is a palm tree that tolerates multiple environmental conditions, with complex development characteristics. The objective is to understand the population structure, the spatial distribution of this species in different environments and the effect of environmental gradients on its occurrence on Marajó Island, Pará. The hypothesis is that the population density of the species, as well as the spatial distribution, depends on the environment in which it is inserted. The study was carried out in 11 communities of residents of five different physiognomies, in which all individuals belonging to 42 sample units were mapped, measured and were categorized in height classes for further analysis. The results showed an abundance of juvenile individuals and a spatial distribution grouped across all physiognomies. The evidence points to a growing population, probably influenced by anthropic actions. Variables such as vegetation index of normalized difference, slope and distance from rivers were shown to be linked to the development of morphological characteristics. Finally, the occurrence of this species in physiognomies may be linked to the land use system, as it contributes to the creation of favorable environments for its development and, although differently, it has shown a high degree of adaptation to atypicals.
Highlights
IntroductionA typical palm of this landscape is Astrocaryum vulgare Mart.), Known as tucumã-do-pará, which plays an important role in the structure and functioning of many ecosystems (Elias et al 2015, Elias 2017), in addition to having a value invaluable cultural resource for Amazonian people, who use practically all parts of plants in a variety of applications, mainly in Marajó Island, Pará (dos Santos et al 2015, Oliveira et al 2018)
These were distributed in classes of size that ranged from seedlings to adults over 2.0m in height, showing that it is a population that is continuously developing in the areas of field (C), transition between field and park savannah (C / Savannah Park (SP)), savannah park (SP), secondary forest (MS) and in backyards (Q)
The results of this study showed that the population of tucumã-do-pará showed typical density of the species, with abundance of juvenile individuals and clustered spatial distribution pattern in all the studied physiognomies
Summary
A typical palm of this landscape is Astrocaryum vulgare Mart.), Known as tucumã-do-pará, which plays an important role in the structure and functioning of many ecosystems (Elias et al 2015, Elias 2017), in addition to having a value invaluable cultural resource for Amazonian people, who use practically all parts of plants in a variety of applications, mainly in Marajó Island, Pará (dos Santos et al 2015, Oliveira et al 2018) This species occurs spontaneously in different environments, whether in the form of clumps or solitary plants, and can sprout after fires (Cymerys et al 2005, Guedes 2006, Zaninetti 2009), which are recurrent in Marajó. Due to the complexity of the characteristics of this species, further study of the population structure, that is, the development and biological characteristics of its individuals, allows us to understand their current interaction with the environment, diagnose the occurrence of
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