Pollen analysis has been, and still is, one of the most widely used techniques in Quaternary sciences, especially to reconstruct vegetation history and climate variability. Fossil deposits of accumulating plants, such as peat sediments, were very early investigated as they are particularly suitable for the reception, storage and conservation of palynomorphs. Thanks to successive methodological innovations, palynological analyses then gradually developed by multiplying studies of diverse more mineral sedimentary materials (lake, stream and/or marine sediments, loess deposits, travertine, etc.). These new efficient techniques also led to an interest in archaeological sediments, allowing palaeoenvironmental reconstructions where no adequate Quaternary continental sedimentary records are available. Soon after the mid-20th century, caves and rock-shelters became then the favored studied places in karstic areas to approach the environment of prehistoric humans. However, the pollen record in caves is a complex phenomenon in which multiple geological, biological and atmospheric factors are involved and could lead to some distortions and discontinuities in the pollen assemblages. When not perceived, these pitfalls have sometimes generated some over or misinterpretations. After a keen interest, cave sediment sequences were thus considered as unattractive, presenting lot of alterations, difficult to correlate and with a low palaeoenvironmental potential. The validity and scope of the interpretation of palynological data from this type of deposits are still highly controversial and debatable. In Belgium, a systematic program of detailed stratigraphic recordings from caves associated with various palaeoenvironmental analyses has recently been undertaken in close collaboration with researchers from different disciplines. The objective was to better understand the sedimentary dynamics of these fillings and to test their potential as recorders of Quaternary climatic variations. In that context, new pollen data from two Belgian caves have been acquired and open new prospects for research work in this type of environments. In this paper, we present the state of the art of cave palynology, including the different parameters defining pollen taphonomy, the potentials and the limits of pollen analysis on Quaternary cave deposits. Through the examples of the caves Walou and Scladina, we show that good palynological results can be obtained in these contexts. These records are compared and evaluated in the light of multidisciplinary palaeoecological information from these two prehistoric settlements. When precautions are taken and a close link with geology and archaeology is maintained, local environment of the prehistoric populations, but also major trends in vegetation evolution and climate change during the Middle Paleolithic, can be accurately documented by pollen records from cave sequences.
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Several initiatives aim to map the diversity of Natural History (NH) collections and standardise their descriptions. The Global Registry of Biodiversity Repositories (GRBio) is the most recent global registry. Unfortunately the server has been down since mid-2018 but the Global Biodiversity Information Facility (GBIF) recently "rescued" this data. In addition to this, the One World Collection exercise is a set of high-level collection descriptors (size, group coverage and geographic distribution) supporting a common strategy between the largest world institutions. Despite these efforts, a large part of the NH collections remains digitally unavailable and digitisation at the specimen level will take several decades. A new NH collections dashboard is needed in order to harmonise the efforts of the institutions. The Consortium of European Taxonomic Facilities (CETAF) is a good place to introduce this excercise. CETAFʼs members hold over half of the worldʼs NH collections, representing 80\% of the world's bio- and geo-diversity. Most of these collections are now engaged in the preparation for the common process of the Distributed System of Scientific Collections (DiSSCo, European Strategy Forum on Research Infrastructure). Additionally in Belgium, the Royal Belgian Institute of Natural Sciences (RBINS), Royal Museum of Central Africa (RMCA), Meise Botanic Garden (MBG) and CETAF have joined efforts to set up a common research portal (Natural Heritage, BRAIN-be project). The goal is to link together several collection management systems (CMS) and to (re)create links between isolated collection items. The CETAF collections dashboard splits the information into small metadata units related to topics relevant to the collections (taxonomy, geographic distribution, digitisation strategy and coverage, stratigraphy, etc.). The model allows for the creation of new units without a complete modification of the database structure. All units are defined by the Dublin Core and by fields derived from the Innovation and consolidation for large scale digitisation of natural heritage (ICEDIG) d2.3 deliverable (van Egmond et al. 2019). The object hierarchy allows for the creation of sub-collections and preserves the unity of the information. The CMS has an internal object database with a full index and a faceted search interface. It also has web services and XLS (Microsoft®Excel®)$~$import/export functionalities. The collection dashboard also includes a complete workflow and access rights management at the object level. This is important for the information that is protected by the EU General Data Protection Regulation (GDPR). The dashboard is now being evaluated with the collections hosted by the partners of Natural Heritage. The system will be proposed to CETAF members and connections will be established with the international portals such as the GBIF or the future DiSSCo portal.
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RBINS Staff Publications 2019
