If you’re allergic to pollen, you might be more likely to curse the existence of those microscopic particles. You’re not alone: up to 30% of the world’s inhabitants suffers from hay fever, which is usually pushed by pollen allergic reactions. Shifting international climates are more likely to push that figure even higher.
Nonetheless, pollen represents probably the most highly effective instruments to uncover the character of previous environmental change.
I’m the pinnacle of the Palaeoecology Laboratory at Nelson Mandela University in South Africa. My analysis focuses on unravelling the secrets and techniques of historical environments and ecosystems by analyzing fossil pollen grains. These tiny time capsules maintain a wealth of details about the earth’s previous. They assist scientists to reconstruct ecosystems, observe local weather change and perceive the evolution of vegetation.
However it may be tough to supply pollen deposits in arid areas. That’s as a result of such deposits are sometimes present in massive lakes, that are briefly provide in southern Africa. That’s the place an unlikely scientific ally enters the image: the fossilised urine of a small mammal, the rock hyrax (South Africans name them “dassies”).
Pollen grains are extremely sturdy as a result of they’re product of an natural substance (known as sporopollenin) that could be very immune to decay. Pollen is launched into the air, typically in massive portions, and might decide on surfaces like lakes, and turn out to be preserved in sediment deposits over hundreds, and even thousands and thousands, of years.
Within the lab, we look at the pollen present in these deposits utilizing a microscope. By figuring out the several types of pollen grains discovered throughout the totally different layers (representing totally different time slices) we will reconstruct the world’s vegetation historical past. Crops develop beneath particular weather conditions: as an example, desert vegetation can develop beneath low rainfall situations whereas forest vegetation want excessive quantities of rainfall. So we will make inferences concerning the local weather on the time that the pollen was included into the deposit.
As I’ve mentioned, southern Africa’s arid climates imply there are only a few massive lakes within the area. This makes it a problem to supply deposits that adequately protect pollen inside them over lengthy durations of time. That’s the place fossilised dassie urine is available in.
These sticky deposits known as “middens” accumulate in rock crevices in mountainous areas over hundreds to tens of hundreds of years and comprise superbly preserved pollen grains. As additionally they comprise varied different sorts of proof (reminiscent of geochemical knowledge) and could be precisely dated, they signify probably the most precious archive of previous local weather knowledge in southern Africa. The oldest middens we’ve labored with date again 50,000 years.
The analysis my lab conducts, specializing in harnessing the ability of the common-or-garden pollen grain and utilising distinctive archives reminiscent of hyrax middens, is strongly multidisciplinary. It attracts collectively parts from botany, geography, geology, climatology and archaeology.
We’re at present producing fossil pollen information from a number of websites throughout the Cape Fold Belt mountains of South Africa. For instance, now we have a midden sequence that covers the final 6,000 years from the Baviaanskloof within the Jap Cape province. The fossil pollen from this sequence reveals that there was a dramatic shift in vegetation about 3,300 years in the past, pushed by a big fireplace occasion and elevated temperatures. We’re hoping to publish this analysis quickly.
This info supplies baselines of variability in pure programs and might help inform present conservation efforts throughout the Baviaanskloof, which is a biodiversity hotspot.
Another project that we’re concerned in is centred on the archaeological excavation inside South Africa’s southern Cape area at a website known as Boomplaas Cave. By utilizing the fossil pollen inside hyrax middens discovered throughout the neighborhood of Boomplaas Cave, we hope to supply the environmental context to the archaeological file which might help to decipher how early people responded to local weather change.
And looking out ahead
We’re not solely working throughout the realm of the previous: as pollen is among the fundamental sources of allergic reactions it is very important monitor the categories and quantities of pollen at present current within the air we breathe. My lab is a part of the South African Pollen Monitoring network and we generate pollen knowledge for town of Gqeberha within the Jap Cape province.
This initiative focuses on analysing pollen captured within the air throughout a number of totally different components of South Africa and guaranteeing that this info is publicly out there. This challenge is especially necessary as, due to climate change, pollen seasons are lengthening and allergenic pollen is increasing.
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