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Species are being lost around the world, but in different regions, there are variables. Scientists have analyzed about two hundred investigations in this regard and the conclusions show that the biodiversity crisis is not just a decline, but a large-scale reorganization. The oceans of the tropics are the most affected by the loss of species.
Man's activities have managed to impact world diversity, especially those related to intensive land use and climate change. Extinction rates vary from region to region, but on a global scale the loss of biodiversity is evident.
New research published in the journalScience, indicates that global biodiversity projections do not always match highly variable trends observed at the local level.
The team of scientists, led by the German Center for Integrative Biodiversity Research (iDiv) in Germany and the Center for Biological Diversity at the University of St. Andrews (UK), has examined spatial and geographic variation in species richness and the alteration in the composition of biodiversity by mapping trends in sea, land and fresh water around the world.
The analysis has been made possible thanks to the use of data from 239 scientific studies with more than 50,000 time series from the BioTIME database, the largest collection of local biodiversity time series to date.
“We find a clear geographic variation in the change of biodiversity”, The authors clarify in their work. According to the scientists, these findings are important since historically it has been “surprisingly difficult and controversial”Identify global trends in the biodiversity of local ecosystems.
In their analysis, Shane Blowes of the German center and his colleagues found that the composition of local species assemblages is rapidly reorganizing.
The oceans are the most affected
The study shows that the loss of biodiversity is not homogeneous. The greatest disturbances are occurring in the oceans, with upward or downward changes of up to 20% per year, especially in tropical marine biomes, which are critical points of loss of species richness.
These results, which have been challenging for their authors, can help inform how to prioritize conservation issues. Scientists propose that our understanding of biodiversity loss is conditioned by the context and location of each ecosystem, and they have no doubt that the impacts of climate change and other human activities are causing unprecedented disruption to biodiversity around the world. .
S.A. Blowes et al. "The geography of biodiversity change in marine and terrestrial assemblages"Science Oct 17, 2019