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Article Reference The common morphospecies Cypridopsis vidua (O.F. MÜLLER, 1776) (Crustacea, Ostracoda) is not an obligate parthenogen
The common non-marine ostracod Cypridopsis vidua (O.F. Müller, 1776) is used as a proxy in various biological disciplines, such as (palaeo-)ecology, evolutionary biology, ecotoxicology and parasitology. This morphospecies was considered to be an obligate parthenogen. We report on the discovery of the first population of C. vidua with males from Woods Hole (MA, USA) and determine that it is a population with mixed reproduction. We describe the morphology of the males and of the sexual and asexual females. We illustrate a copula of a male and a sexual female as well insemination in a sexual female, showing that males are functional. Therefore, Cypridopsis vidua is a morphospecies with mixed reproduction, not a full apomictic parthenogen. We use, for the first time, polychromatic polarization microscope technology to illustrate soft parts of ostracods. In addition, we compare the sexual species C. bisexualis, C. okeechobei, C. howei and C. schwartzi and conclude that these species, especially the latter three, are morphologically very close to C. vidua.
Located in Library / RBINS Staff Publications 2023
Article Reference The complete phylogeny of extant pangolins: scaling up the molecular tracing of the most trafficked mammals on earth
Located in Library / RBINS Staff Publications 2017
Article Reference The complexity of 3D stress-state changes during compressional tectonic inversion at the onset of orogeny
Compressional tectonic inversions are classically represented in 2D brittle failure mode (BFM) plots that illustrate the change in differential stress (σ1−σ3) versus the pore-fluid pressure during orogenic shortening. In these BFM plots, the tectonic switch between extension and compression occurs at a differential stress state of zero. However, mostly anisotropic conditions are present in the Earth's crust, making isotropic stress conditions highly questionable. In this study, theoretical 3D stress-state reconstructions are proposed to illustrate the complexity of triaxial stress transitions during compressional inversion of Andersonian stress regimes. These reconstructions are based on successive late burial and early tectonic quartz veins which reflect early Variscan tectonic inversion in the Rhenohercynian foreland fold-and-thrust belt (High-Ardenne Slate Belt, Belgium, Germany). This theoretical exercise predicts that, no matter the geometry of the basin or the orientation of shortening, a transitional ‘wrench’ tectonic regime should always occur between extension and compression. To date, this intermediate regime has never been observed in structures in a shortened basin affected by tectonic inversion. Our study implies that stress transitions are therefore more complex than classically represented in 2D. Ideally, a transitional ‘wrench’ regime should be implemented in BFM plots at the switch between the extensional and compressional regimes.
Located in Library / No RBINS Staff publications
Article Reference The composite Kortrijk section (W Belgium): a key reference for mid-Ypresian (Early Eocene) stratigraphy in the southern North Sea Basin
The upper part of the Kortrijk Clay Formation (the Roubaix Clay and Aalbeke Clay Members of mid-Ypresian age) has been exposed in road and canal cuttings and clay quarries in the Kortrijk area (western Belgium), and penetrated by several cored boreholes. It is overlain disconformably by the Mont-Panisel Sand Member of the Hyon Sand Formation (upper middle Ypresian). The Roubaix Clay Member contains diverse and well-preserved calcareous nannofossils, dinoflagellate cysts, foraminifera, ostracods and other calcitic microfossils, and less well-preserved mollusc assemblages, while the Aalbeke Clay Member is secondarily decalcified. The calcareous nannofossil subdivision of upper NP11 and lower NP12 has been recognised in the Kortrijk area, and calibrated with the NW European mid-Ypresian dinoflagellate cyst, ostracod and planktonic foraminiferal zones and datums (e.g. Subbotina influx). Several medium-scale depositional sequences, with an estimated duration of 400 kyr or less, have been recorded. Their respective boundaries coincide with the resistivity maxima identified on the majority of the wireline log profiles of the Belgian Ypresian. Integrated biostratigraphic, magnetostratigraphic and sequence stratigraphic analysis enables correlation with other areas in Belgium, with the London Clay Formation of southern England, and with the standard chronostratigraphic scale. A marine erosion surface has been identified at the base of Unit 20 in the Kortrijk area (mid-Ypresian, early Biochron NP12, middle C24n.1n, ~ 52.8 Ma), corresponding to the first occurrence of estuarine channel-fill units in southern England. This indicates a brief but profound sea-level fall, either eustatically or tectonically controlled. The composite Kortrijk section is proposed as a reference section for the middle Ypresian in the southern North Sea Basin, and for similar settings in mid- to high-latitudes of the Northern Hemisphere (e.g. Kazakhstan and Crimea).
Located in Library / RBINS Staff Publications 2017
Inbook Reference The conceptual model for an abandoned coal mine reservoir
Located in Library / RBINS Staff Publications
Article Reference The continuous exploitation of wild animal resources in the archaeozoological record from Ghana
The paper provides a critical review of the archaeozoological information from Ghanaian sites published up to now and summarizes the new faunal analysis of several Gonja and Asante sites. The data suggest the persistence of the use of the various wild animal resources available and limited reliance on domestic animals since late prehistoric times up to today, although certain resources such as molluscs, insects etc. may have limited or no visibility. Intensive utilisation of edible wild resources may be prevalent in African woodlands.
Located in Library / RBINS Staff Publications
Article Reference The contribution if Jan H. Stock to the origin and biodiversity of subterranean aquatic crustaceans (an introduction to the Jan H. Stock memorial Syposium's theme)
Located in Library / RBINS Staff Publications
Article Reference The Cordex.be initiative as a foundation for climate services in Belgium
Located in Library / RBINS Staff Publications 2018
Article Reference The cost of CO2 geological storage is more than a number
CO2 geological storage is the last stage in the CO2 capture and storage process which aims to reduce CO2 emissions into the atmosphere. The cost of storage has frequently been regarded as minor compared to the cost of the whole CCS process. There are however a multitude of cost parameters that will form a unique combination for each storage project, with costs projected from one to several tens of euros per tonne of CO2 stored. Several research efforts have lately been identifying the main cost drivers and relatively wide cost ranges. Reservoir type and location, geological uncertainty, injectivity and capacity are recognised as the main source of cost variation between potential storage projects.
Located in Library / RBINS Staff Publications
Article Reference The creodonts (mammalia, Ferae) from the Paleocene-Eocene transition in Belgium (Tienen Formation, MP7)
Study of the dental remains of creodont mammals from the Paleocene-Eocene transition in Belgium (Tienen Formation, reference-level MP7) allows seven species to be recognized, four of which belong to the family Hyaenodontidae and three to the Oxyaenidae. The four hyaenodontid species, which are new to science, present numerous symplesiomorphic characteristics. They represent the oldest hyaenodontids of northern Europe and are shown to be the most primitive representatives of the sub-family Hyaenodontinae known so far. They are closely related to the oldest North American species but the morphological differences between them demonstrate that they are not vicariant species. Thus, the Belgian species could be at the origin of the American hyaenodontid lineages or belong to lineages already distinct but recently differentiated from common ancestors slightly older than both of these species groups. As for oxyaenids, their dental morphology shows that they could originate from the North American Paleocene lineages, although their small size does not support this hypothesis. The smallest Belgian creodont, Prototomus minimus n. sp. is remarkable in that it may present sexual dimorphism in mandibular morphology.
Located in Library / RBINS Staff Publications