Fast-forward to the present day, and much of our current scientific knowledge of global plant and fungal diversity comes from specimens hosted by the world’s herbaria and fungaria, of which there are more than 3,000. But despite this wealth of knowledge and collections, one might be surprised to learn that, to date, we have not been able to answer one of the most fundamental questions in plant and fungal diversity with confidence – namely, how many species are there globally and in different parts of the world?
The consequences of our insufficient knowledge on biodiversity and distribution are manifold. Scientists may have drawn biased – or possibly even incorrect – conclusions on the patterns and underlying drivers of diversity. Beyond the impacts of knowledge gaps and inaccuracies on efforts to answer fundamental scientific questions, there are serious implications for conservation given that several targets in the Kunming–Montreal Global Biodiversity Framework, such as those related to protecting and restoring biodiverse habitats, rely on having robust biodiversity data.
Around the world, myriad Lifeforms have evolved to depend On each other in complex ways. This biodiversity, at scales from Single genes to entire ecosystems, Is essential for our existence.
Plants, in particular, provide us with food, materials, medicines and more. They regulate important planetary cycles that provide us with the air we breathe and water we drink, and contribute to our overall well-being.
If we are to safeguard life on Earth, we must end the current extinction crisis in which plant species are dying out at least 500 times faster than before humans existed.
But with limited time and resources, we need to know how best to conserve biodiversity to keep ecosystems diverse and functioning, while preserving species with the greatest potential for use by future human population.
Researchers measure biodiversity in different ways, including by considering the distinctiveness of species resulting from their evolutionary history.
Diverse evolutionary lineages underpin an ecosystem’s resilience to environmental change.
Traditionally, conservation has focused on species richness and endemism. However, phylogenetic diversity, which takes account of evolutionary history, is a more effective measure of capturing diversity and ensuring ecosystems remain resilient.
The maps show that phylogenetic diversity is more evenly distributed across the globe, so current conservation priorities may need to be rethought to ensure critical biodiversity is not lost.
32 plant data darkspots have been identified worldwide. Fourteen are within tropical Asia, nine within South America, six in temperate Asia, two in Africa, and one in North America.
They are the dark matter of botany – plant species that are yet to be scientifically named, described and mapped but which are estimated to make up 15% of the world’s flora. As well as being part of the global
With 77% of undescribed species predicted to be threatened with extinction (see Chapter 9), the race is on to find and conserve them.
Many species that are unknown to science are, in fact, well known to indigenous communities.
Iran is one of six plant diversity darkspots located within temperate Asia.
The largest knowledge gaps on plant diversity and distribution occur in Colombia.
New Guinea comes second in terms of knowledge gaps and is also the only country not to overlap with the current global Biodiversity Hotspots.
Madagascar and cape provinces have the greatest combined data gaps for Africa.
Overall, the work indicated that if recent trends in scientifically describing and mapping new plant species continue, current botanical collection may be insufficient to completely document the geographical distribution of all vascular plants in the near future.
And while the current Biodiversity Hotspot classification is regarded as a useful framework to guide biodiversity scientists and conservationists, the new research findings show that the Hotspots alone are not enough to inform collection priorities. Rather, in parallel with the findings outlined in Chapter 6, they indicate that considering plant diversity darkspots in conjunction with Hotspots would be a better approach going forward.
Citation
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