Biology subjects

Bueno, M. L.

Publications and source records attributed to Bueno, M. L..

2 recordsLinked to original sources

bioRxiv2023

FROM FOREST TO SAVANNA AND BACK TO FOREST: EVOLUTIONARY HISTORY OF THE GENUS Dimorphandra (LEGUMINOSAE)

The tree genus Dimorphandra comprises 26 species, which are circumscribed into three subgenera. The subgenus Dimorphandra is associated with both rainforests (Amazon and Atlantic Forest) and savanna-like vegetation (Cerrado); whereas the subgenera Pocillum and Phaneropsia are restricted to the Amazon. We obtained DNA sequence data from six gene regions of the chloroplast genome (cpDNA) and the nuclear internal transcribed spacer (ITS) from 17 species of Dimorphandra and 12 closely related species. Bayesian phylogeny and haplotype network analyses together with both ancestral area reconstructions and ecological niche modeling allowed for exploring the late evolutionary history of the genus Dimorphandra. Species within the subgenus Phaneropsia were more closely related to species of the genus Mora than to the remaining congeners in the plastid tree (but not in the ITS tree), casting doubts on the monophyly of Dimorphandra. Such incongruence may be the result of incomplete lineage sorting of ancient polymorphisms. Amazonian lineages (subgenera Pocillum and Phaneropsia) were highly polymorphic and divergent; whereas lineages from either the Cerrado or the Atlantic Forest were genetically depauperate. The Amazon seems to be the likely source of the lineage that gave rise to the extant species of Dimorphandra of the Cerrado. In turn, a lineage that occupied the Cerrado likely gave rise to the extant species that occur in the Atlantic Forest. Habitat shifts may have been a key driving force that shaped the late evolutionary history of Dimorphandra.

evolutionary biology↗

bioRxiv2020

Identifying priority connectivity in a tropical forest hotspot severely affected by land use changes

The probability that a propagule reaches a certain location where it can establish and persist is affected by the distance from the source. Fragmented landscapes often promote the isolation of habitats that hinder or impede the movement of species that affect their range distribution, even when environmental conditions are adequate. Studies that assess the connectivity of the landscape are essential to ensure that ecological conservation planning covers all vital processes that occur on a landscape scale. Based on the classification of land cover in the Rio Doce Basin - RDB, we used a habitat / non-habitat approach to assess RDB connectivity for tree species. Based on circuit theory, we built 6 surface models of resistance based on habitat and non-habitat areas. We performed the analysis using the GIS plug-in and Linkage Mapper to generate lest cost path maps. The RDB is very fragmented, but still has functionally connected regions. The west to nothwestern and southeastern portions of the basin are well-connected and demand conservation practices, while the center-north of the basin and the far southwest are regions with greater resistance to connectivity as a result of strong anthropic pressures that reduce forests, requiring intervention through restoration projects avoiding loss due to lack of connectivity. In addition, land reclamation projects in degraded areas must also be organized in the Linhares region, as it is inserted in a region of very high biodiversity with a high level of endemism and a high number of threatened species.

ecology↗