Population trends of medium to large-sized vertebrates in protected areas in brazilian Amazonia
DOI:
https://doi.org/10.37002/biodiversidadebrasileira.v14i3.2484Keywords:
Amazonia, Biodiversity index, Biodiversity monitoring, Population trendsAbstract
The current biodiversity crisis has generated a growing demand for information on the status and trends of biodiversity, especially in mega diverse regions such as the tropics, where comprehensive data is lacking. In view of this, the Brazilian government developed the Brazilian in situ monitoring program of Federal Protected Areas – Programa Monitora, a long-term program aimed at monitoring the state of biodiversity and ecosystem services in federal protected areas (PAs). In this study, we used a nine-year monitoring time series (2014-2022) from 22 PAs in the Amazon to assess trends in 167 populations of medium- to large-sized terrestrial birds and mammals, as well as aggregate biodiversity trends, using the geometric mean of the relative abundances as a biodiversity index. We found stability, decline and increase for 92%, 6.5 and 0.6% of the analyzed populations, respectively. We did not find differences between the population growth rates of birds and mammals, or between populations located in strictly protected and sustainable use PAs. The geometric mean of relative abundances remained stable over the sampled period. The results suggest that, in general, the monitored PAs have been effective for the conservation of the program's target populations, although some populations have suffered significant declines, which raises an alert. In the near future, the time series will become longer and longer and more and more PAs and populations will become eligible for analysis. Therefore, the continuity of the program is essential to ensure more robust results.
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