November 7, 2024
Open access:
Witteveen, N.H., Kleijwegt, Z.S., Geara, H., Kool, C., Blaus, A., Saenz, L.C., Gomes, B.T., Philip, A., Bush, M.B. & McMichael, C.N.H. (2024) Quantifying past forest cover and biomass changes in the Ecuadorian Amazon. New Phytologist. DOI: 10.1111/nph.20237
This paper is the latest to come from the PhD thesis of Nina Witteveen who defended at the University of Amsterdam earlier in 2024. To find out more about Nina’s PhD click here.
July 29, 2024
Open access:
Heijink, B.M., Zwarts, A., Witteveen, N.H., Watson, J., Ebbenhorst, A., Veenman, F., Kessel, M., León-Yánez, S., Guevara-Andino, J., Endara, M., Rivas-Torres, G., Bush, M.B. & McMichael, C.N.H. (2024) Past fire and vegetation change in the hyperdiverse forests of the Ecuadorian Amazon. Plants 13. DOI: 10.3390/plants13152048
April 11, 2024
Teunissen van Manen, M.L. (2020) Plant wax n-alkane biomarkers in the tropical Andes (Ecuador). PhD Thesis, University of Amsterdam, Amsterdam. ISBN: 9789491407857
Abstract
Developing new applications for plant wax n-alkane biomarkers can deepen our understanding of ecosystem history. In this thesis I study modern and sedimentary n-alkane signals, sourced along the tropical Andes, to better understand how they can be used as a proxy for past environmental change. The overarching question addressed in this thesis is: what do n-alkane patterns extracted from sedimentary records reflect? Specifically, I address:• Do environmental or taxonomic factors dominate the n-alkane signal?• Does the n-alkane signal alter as the plant material degrades?• How much of the n-alkane variability can be explained by our analytical protocols?I find that the taxonomic and environmental signals of n-alkane patterns are entangled, especially in leaf n-alkanes. Soil n-alkane patterns reflect environmental conditions at the site, but the results cannot rule out a taxonomic signal in soil n-alkane patterns. I also find that, as the source material degrades (leaves), the n-alkane patterns are altered. Although the n-alkane signal is recognizable as having plant origin, there is a reduction in n-alkane pattern variability and the metric for degradation becomes an increasingly important descriptor of the n-alkane pattern shifts observed in soils and sediments. I find evidence that the metric for degradation can be used as proxy for past environmental change, but the application of this n-alkane signal proxy is not straightforward. Finally, I find there is little understanding of how much extraction and measurement protocols contribute to the n-alkane pattern variability and what implications this has on interpretations of the n-alkane signal.
Handel: http://hdl.handle.net/11245.1/716e0c42-7bc7-4270-9d76-e4c556c51e1a
April 9, 2024
Cuesta C., F.X. (2019) Global environmental changes in the high tropical Andes. PhD Thesis, University of Amsterdam, Amsterdam. ISBN: 9789491407758
Abstract
The high tropical Andes harbours vital ecosystems that sustain biodiversity, carbon storage, and environmental service provision for millions of people. They are identified as one of the most vulnerable terrestrial ecosystems to global environmental changes, particularly to climate change and land use conversion. Despite their vulnerability and the importance of global biodiversity conservation and Andean societies, they are among the least studied ecosystems in the world. In this thesis, I studied the patterns of summit plant community’s across the tropical section of the Andes. Further, I studied what environmental factors influence plant community composition, species diversity, and thermal niche traits in high tropical alpine ecosystems. Based on the thermal niche traits, I assessed the potential vulnerability of species and communities to climate warming, considering the effect of the climate variability hypothesis on the species niche breadths. Further, I synthesised the current state of knowledge and assessed the current and projected landscape changes in the high Andes due to the combined effect of glacier retreat and climate warming. I reviewed documented glacier changes and landscape evolution over past decades to millennia and assessed projected future glacier shrinkage until 2100 for two case studies in the Andes of Ecuador and Peru. I also evaluated the capacity of high Andean ecosystems to recover from land use changes using the aptitude to store and take up carbon together with plant diversity. Lastly, I carried out an applied research analysis aimed at informing conservation policy formulation in continental Ecuador through defining critical areas for biodiversity conservation.
Handel: http://hdl.handle.net/11245.1/c97e30b0-90d7-4363-9d33-50d288089712
November 6, 2023
Pinto, E., Cuesta, F., Bernardi, A., Llerena-Zambrano, M., Pérez, ÁJ., van der Sande, M.T., Gosling, W.D. & Burgess, K.S. (2023) Determinants of above-ground carbon stocks and productivity in secondary forests along a 3000-m elevation gradient in the Ecuadorian Andes. Plant Ecology & Diversity DOI: 10.1080/17550874.2023.2274844
August 16, 2023
By: Lina Cabrera Sáenz and Bianca Gomes
We invite you to join us on an incredible journey through the heart of Ecuador, where a group of adventurous students from Florida Institute of Technology embarked on a life-changing experience as part of the Neotropical Archaeoecology summer field course. Buckle up as we delve into the marvels of nature, indigenous cultures, and unforgettable experiences. Let’s dive right in!
Our adventure began with a breath-taking visit to the Paramo at Cayambe-Coca National Park. Paramos are high altitude (3000-4000 metres) wet grasslands above the tree line and below the snow line within the equatorial Andes. Our tour guides Patricio and Byron gave us information about the local vegetation, focusing on the Polylepis tree (locally known as “paper tree”), which is unique to this sort of habitat. They also told us about some of the fascinating wildlife that can be seen here, such as the Andean Bear (Tremarctos ornatus) and the Andean Puma (Puma concolor).
We then descended through the cloud forest (3,600–3,400 meters) and lower montane rainforest (3,400–2,500 meters). Across these various habitats, we documented changes in hummingbird abundance and recorded their behaviour at four different feeder points: Guango Lodge, La Brisa, San Isidro Lodge, and Cascada el Hollin. The sheer diversity of hummingbird species left us in awe, and we marvelled at their iridescent feathers and incredible agility.
We explored a waterfall near San Isidro Lodge (https://cabanasanisidro.com), and we were able to observe pre-Inca pottery. At the lodge we also saw a diverse array of bird species, which was delightful! The forest’s nightlife brought us close encounters with a group of nocturnal monkeys, and to our surprise, we stumbled upon a very rare mountain tapir. The following morning we saw a small agouti (a small rodent) prowling around the lodge, and ended our adventures in the cloud forest on a high note.
San Isidro waterfall and some of the animal diversity we observed
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September 29, 2022
Open access:
Hagemans, K., Urrego, D.H., Gosling, W.D., Rodbell, D.T., Wagner-Cremer, F. & Donders, T.H. (2022) Intensification of ENSO frequency drives forest disturbance in the Andes during the Holocene. Quaternary Science Reviews 294, 107762. DOI: 10.1016/j.quascirev.2022.107762
September 21, 2022
During the delivery of this years BSc Palaeoeclogy course at the University of Amsterdam (UvA) I discussed with a number of students about the nature and purpose of understanding the ecology of the past. This lead me to highlighting the research of Nick Loughlin (@PalaeoNick) from his PhD at The Open University and the subsequent work that he has done. I though it might be interesting to also share this here…
Nick’s study sought to understand better the ecological history of the biodiverse eastern Andean flank in Ecuador. To achieve this he went into the field and recovered sediments from a lake and a sedimentary section exposed by a road cutting. He analysed the sediments to reveal vegetation change (pollen analysis), fire histories (charcoal analysis), and past animals in the landscape (non-pollen palynomorphs, or NPPs). To extract extra ecological information from his samples he developed the methodological approach for examining NPPs in a tropical setting (Loughlin et al. 2018a). He then combined all the different palaeoecological approaches to reveal the drivers of vegetation change during the last glacial period (in the absence of humans; Loughlin et al. 2018b), and during the last 1000 years (when indigenous and European human populations radically altered the landscape; Loughlin et al. 2018c). The insights gained from Nicks research provided empirical evidence of how humans have been modifying this biodiversity hotspot on the timescales relevant to the lifecycles of tropical trees. These findings and ideas were collated in his PhD Thesis at The Open University which was supervised by Encarni Montoya, Angela Coe and myself (Loughlin, 2018a). Subsequently, Nick has been working to broaden the impact of his work and to communicate his findings to the broader scientific and conservation community. This has lead to two new publications focused on understanding baseline ecological function and conservation implications (Loughlin et al. 2022, Nogué et al. 2022).
The arch of research carried out by Nick, I think, really demonstrates the important of understanding the ecology of the past – without his detailed investigation of microfossils we could not have seen the impacts of indigenous communities on the past Andean landscape, or identify the consequences of the European depopulation; or been able to estimate the timescales of the ecological change!
References
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March 25, 2021
Open access:
McMichael, C., Witteveen, N.H., Scholz, S., Zwier, M., Prins, M.A., Lougheed, B.C., Mothes, P. & Gosling, W.D. (2021) 30,000 years of landscape and vegetation dynamics in a mid-elevation Andean valley. Quaternary Science Reviews 258, 106866.
March 24, 2021
Mark Bush is looking to recruit a PhD researcher to the “Neotropical Palaeoecology Research Group” at Florida Institute of Technology.Applications are invited from qualified and highly-motivated students for an exciting PhD studentship in the areas of paleoecology and community ecology of South American lowland rainforests.
Ecology of the past 