Climate change and plant distribution and diversity refuges in Brazilian
northern savannas
Abstract
Objective: Climate change coupled with anthropogenic events can alter
the distribution of biological groups and affect the reorganization,
structure, dynamics and functioning of ecosystems and their services.
Despite this, predictions of impacts on Brazilian savannas are scarce.
This study estimated the potential effects of climate change on
peripheral plant diversity by predicting the distribution of species
from Cerrado. Site: Northern Brazilian Cerrado (NBC). Methods:
Ecological niche modeling was used to provide present and future
projections of responses in terms of occurrence of ten woody species
based on four algorithms and four future climate change scenarios for
the year 2050. Potential refuge areas for conservation actions were
identified, and evidence of the vulnerability of the flora was
demonstrated based on the disparity between potential areas of climate
stability amid current protected areas (Conservation Units - CUs).
Results: The results suggested a lack of pattern between the scenarios
and an idiosyncratic response of the species, indicating different
impacts on plant communities and the existence of unequal stable
alternative conditions, which could bring consequences to the ecological
relationships and functionality of the floras. Even in the most
pessimistic scenarios, most species presented an expansion of potential
occurrence areas, suppressing or cohabiting with species of adjacent
biomes. Typically marginal plants were the most sensitive. Key findings:
Overlapping adequate habitats are concentrated in the NBC. The analysis
of habitats in relation to anthropized areas and CUs demonstrate low
future effectiveness in the protection of these savannas, indicating the
need to create CUs that consider the potential effects of climate
change.