We are looking for a researcher with a geosciences background to explore the physical properties of the sediments recovered from Lake Bosumtwi (Ghana). The Lake Bosumtwi sediments we recovered by the International Continental Scientific Drilling Program in 2004 and have been found to span the last c. 1.07 million years (Koerbel et al., 2005). This project will examine the borehole data and relate this ongoing palaeoenvironmental studies at the site (Miller & Gosling, 2014; Miller et al., 2016).
Jardine, P.E., Hoorn, C., Beer, M.A.M., Barbolini, N., Woutersen, A., Bogota-Angel, G., Gosling, W.D., Fraser, W.T., Lomax, B.H., Huang, H., Sciumbata, M., He, H. & Dupont-Nivet, G. (2021) Sporopollenin chemistry and its durability in the geological record: an integration of extant and fossil chemical data across the seed plants. Palaeontology https://doi.org/10.1111/pala.12523
The paper we discussed was “Columbus’ footprint in Hispaniola: A paleoenvironmental record of indigenous and colonial impacts on the landscape of the central Cibao Valley, northern Dominican Republic” by Castilla-Beltrán et al (2018). The paper provides a multi-proxy paleoecological reconstruction of the Caribbean island nation of the Dominican Republic, spanning the last 1100 years. Personally I found this to be a very interesting paper, packed with information and interpretations on the impact of anthropogenic factors on past Caribbean environments. What this paper nicely demonstrates is the difference in impact between pre-colonial and post-colonial societies on the vegetation of the Dominican republic. Pre-colonial Hispaniola was inhabited by indigenous societies, the Taíno people, and while this paper clearly shows them having had an environmental impact in the form of fire management (e.g. for slash and burn agriculture), small scale deforestation and the introduction of cultivars such as maize and squash, their environmental impact remains modest compared to post-colonial disturbances. Columbus arriving in AD 1492 signified a moment of change in the landscape. The paleorecord suggests that, after an initial collapse of the Taíno population, the colonization of the Dominican Republic by the Spanish brought with it deforestation, crop monoculture and the introduction of European livestock, all of which still characterizes the landscape to this day.
The discussion mainly focused on the chronology used. One of the radiocarbon samples was excluded from the age-depth model for no apparent reason, which led us to discuss the importance of critically evaluating your calibrated radiocarbon dates and which ones to incorporate in your age-depth model. The age-depth model currently used implied a shift in pollen composition c. 30 years before the arrival of the Spanish. We were unsure how to interpret these findings because you would expect the shift to happen afterwards, so my initial thought was that it had to be a fault in the chronology. This chronology however does imply a large charcoal peak followed by a rapid decline that coincides precisely with the arrival of the Spanish, and it turned out that this was the reason the authors settled on this chronology.
Even though this paper by Castilla-Beltrán et al. didn’t spark any heated discussions, its incorporation of ecology, botany, history, archeology and geology still showcases the interdisciplinary nature of paleoecology, something I very much enjoy about this field of research.
The second and third weeks of the Environments Through Time course at the University of Amsterdam has focused on obtaining practical experience of developing chronologies, analyzing multi-variate data-sets, and conducting time series analysis. The focus of the course has been on Quaternary environmental change, however, the skills learnt can be applied to almost any time-scale so long as you have time control points you want to tie together, and multiple things you can track changing through that time.
Over the two week period the students worked on a previously published paper that they had selected that contains: (i) chronological information (at least 3 control points), and (ii) multiple variables that change through the time series (at least 9 variables). In week two they deconstructed the chronologies and generated their own revised versions. For example students have (re-)calibrated radiocarbon dates, made different decisions on dates to include/exclude, and used different approaches to constructing the age vs. depth model, e.g. contrasting linear point-to-point vs. Bayesian methodologies. In week three they have taken the data-set(s) associated with their paper and re-evaluated it in light of the revised chronologies using cluster analysis, ordination techniques, and wavelets.
The joy of wavletes
Through this exercise students have gained experience of how to critically assess scientific literature and gained an appreciation of where re-analysis of data-sets can (and cannot) make a difference. Personally I have be delighted with the high level of engagement and enthusiasm for the material and have been excited to have a chance to delve into literature that I would not otherwise be aware of.
It’s very nice to be invited to write something for this blog, let me introduce myself a little bit.
I am a MSc Earth Sciences student at the University of Amsterdam. Currently I am working on my master thesis at Naturalis Biodiversity Center, under supervision of Niels Raes, Willem Renema and William Gosling. We are looking at species migration between Australia and Asia during the Miocene, and we compare it to migration between N and S America at the dawn of the Great American Biotic Interchange. To do so I’m analysing data on fossil occurrences in Australia and Southeast Asia. Hopefully this research will lead to interesting new insights.
Before starting my MSc Earth Sciences I did a bachelor in Biology at Leiden University. I decided to do a master’s in Earth Sciences because it offered a broader perspective of the natural world and its processes.
I like analysing and sorting out data like I’m currently doing for my thesis with fossil occurrence data. It also played a major role in my internship at TNO – Caribbean Branche Office, where I was involved in starting a database containing information on Aruba’s subsurface. During my internship I also experienced the “Green Aruba” conference and was involved in organising a geological excursion for some of the attendants. I am very interested in environmental issues and solutions, such as the transition to renewable energy. New technologies spike my interest a lot and I like being aware of innovations in a whole lot of fields.
Hopefully I will have my thesis ready within a couple of months, and can give an update about some of the findings.
My final teaching job for The Open University was to help deliver the “Sedimentary Rocks & Fossils in the Field” section of the Level 2 Practical Science module (SXG288) offered by the Science Faculty. I have been involved in all three presentations of this section of the SXG288 module, which will now cease to be offered, and a number of other Earth and environmental science residential schools over the last 9 years.
Having the opportunity to engage directly with students and enthuse them face-to-face about the subject I specialise in is a privilege I have gained a lot from. Furthermore, my over-riding impression from the students I have taught is that they feel they benefit greatly from the opportunity to explore first hand the concepts and subjects which they have previously studied in books and online. Based on my experiences on “Sedimentary Rocks and Fossils”, and other modules as both a tutor and a student, I am convinced that to effectively teach geological, geographical, environmental and ecological subjects effectively an element of field-based teaching is required.
Well, we’ve heard from Wes and Adele, and now it’s my turn (Phil Jardine) for a bit of a chat on the “Ecology of the past” YouTube channel. Similar to the previous interview videos, I’m talking about my role on the Bosumtwi pollen chemistry project, and what I’ve done (academically speaking) prior to coming to the Open University. Enjoy!
Malm and Hornborg’s paper ‘The geology of mankind? A critique of the Anthropocene narrative’ raises some important points about the terminology of climate science and how this not only affects perceptions of who or what is to blame, but also of what can be done to address it and by who. The main thrust of their argument is that the use of the term Anthropocene distances people from the effects of man-made climate change through the argument that human nature inescapably led to large CO2 emissions and therefore the havoc being wreaked upon ecosystems is essentially inevitable. They go on to discuss that this ignores the fact that a tiny percentage of humanity actually set into motion the huge changes which we are only now beginning to address, that humanity as a whole at no point decided to take this path and that the use of the term Anthropocene is actually counter-productive, in that it removes the onus of solving environmental problems from the small group of humans that actually caused them, instead spreading it out so thinly that it loses its power.
The argument that Anthropocene is perhaps not the best term to use for the present situation is persuasive, but the idea that it apportions blame too widely does not take into consideration the fact that developing countries are now largely following in the footsteps of developed countries in terms of both habitat destruction and carbon emissions. Although all of humanity may not have started global change, the practices initiated by the few are now being endlessly replicated. The reasons behind this are economic; currently, and largely in the short term, it pays countries and large corporations to continue unsustainable practices. They ignore pressure to change if it undermines economic growth or affects profit margins, not because they do not think they are part of the problem. Academics could choose to call this the ‘Anthropocene’ the ‘OnePercentocene’ or the ‘ThisIsYourFault,Sir,Yes,YouInTheGreySuit,StopPlayingWithYour PhoneAndListen-ocene’, but it will not make the slightest difference until these basic problems are addressed.