Léon Baert

Léon Baert
Royal Belgian Institute of Natural Sciences · Direction Taxonomy and Phylogeny

PhD

About

77
Publications
16,702
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935
Citations
Citations since 2017
13 Research Items
344 Citations
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060

Publications

Publications (77)
Article
Full-text available
We present the first comprehensive review of the ant taxa of the Galápagos archipelago. The review is based on data gathered during literature searches, field surveys, and the revision of museum specimens, and includes information on the distribution, habitat, and ecology of 47 species. At least nine of these species are assumed to be native or end...
Article
The Galapagos archipelago is an ideal location for studying species differentiation on oceanic islands due to its isolation and geological youth. Spiders, as early colonisers, are good model organisms to understand these processes. The aim of this study is to update the list of spiders found in Galapagos and investigate the current distribution pat...
Article
The Galapagos archipelago is an ideal location for studying species differentiation on oceanic islands due to its isolation and geological youth. Spiders, as early colonisers, are good model organisms to understand these processes. The aim of this study is to update the list of spiders found in Galapagos and investigate the current distribution pat...
Article
Full-text available
Between 1993 and 2018 a management to encourage development towards heathland and oligotrophic dry grasslands in Nature Reserve Schobbejakshoogte east of Bruges was carried out. In eutrophic grassland, not managed dunes, heathlands and forest, a continuously and alternatively grazing management deforestation and cutting sods resulted in a mosaic of...
Article
Full-text available
During the period April 2016 to April 2017 four heathland patches in Ter Heyde (Sint-Andries, Brugge) were sampled with 12 pitfall traps in total. Erica cinerea, Calluna vulgaris, Erica tetralix and Molinia caerulea are the dominant plant species at the sampled sites. The reserve is situated between a forest of Pinus nigra var. corsicana on one sid...
Article
Full-text available
105 species of spiders were collected during a year-round sampling with pitfall traps of 3 heathland patches in Provinciedomein Tillegembos south of Bruges. Several rare and interesting species were discovered and discussed. An important part of the spider fauna in these heathlands consists of species characteristic for dry, oligotrophic grasslands...
Article
Full-text available
103 species of spiders were collected during 3 years continuous sampling with pitfall traps of 2 heathland patches in Nature Reserve Zevenkerken southwest of Bruges. Several rare and interesting species were discovered and discussed. Besides a large amount of species characteristic for forest and shrubs also an important part of the spider fauna in...
Article
Full-text available
131 species of spiders were collected during a year-round sampling with pitfall traps of 8 heathland patches west of Bruges. One species, Ozyptila westringi, was recorded for the first time in Belgium, 20 species are mentioned as threatened on the Red list of spiders of Flanders and one species is catalogued as critically endangered on that list: P...
Article
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Identifying patterns in the effects of temperature on species' population abundances could help develop a general framework for predicting the consequences of climate change across different communities and realms. We used long-term population time series data from terrestrial, freshwater, and marine species communitieswithin central Europe to comp...
Article
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In the period 2000-2001 nature restoration projects drastically reshaped the Nature Reserve in Lombardsijde near the Ijzer Estuary in Flanders, Belgium. Dikes were constructed and new dune grasslands were installed. Seven years after the restoration the ant fauna of these newly created sites was compared with reference sites from foredunes, dune gr...
Article
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Climate change, land-use change, pollution and exploitation are among the main drivers of species’ population trends; however, their relative importance is much debated. We used a unique collection of over 1,000 local population time series in 22 communities across terrestrial, freshwater and marine realms within central Europe to compare the impac...
Article
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More than 800 spiders were collected in 43 houses heated in winter, distributed mainly in the northern part of Belgium. Information required for the collections to be eligible for the project was: address, construction year, type of house, and surroundings. The spiders were qualified as ‘house spiders’ or ‘garden spiders’. Of the 93 species collect...
Article
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Selenops galapagoensis was recently synonymized with Selenops mexicanus because the types of the former did not differ from the latter in any visible way. Additionally, a large molecular analysis of the genus from North and Central America and the Caribbean that included both nuclear and mitochondrial genes showed no differences indicating two sepa...
Article
The importance of linear habitat elements connecting core habitat patches for biodiversity conservation is still poorly understood. We surveyed reed strips along drainage ditches and reed marshes in an agricultural landscape to assess how both the density of linear habitat elements and the area of core habitat affect diversity and community composi...
Article
Full-text available
The geographic and ecological distribution of the arachnid species belonging to the Amblypygi (Charinus insularis Banks, 1902), the Opiliones (Galanomma microphthalma Juberthie, 1970), the Schizomida (Schizomus portoricensis (Chamberlin, 1922)), the Scorpiones (Centruroides exsul (Meise, 1934) and Hadruroides galapagoensis Maury, 1975), the Solifug...
Article
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Nemastoma dentigerum Canestrini, 1873 is reported for the first time from Belgium. An overview is given of the situation and the behaviour of this species in the neighbouring countries. The circumstances of the find are compared to other known captures. It is suggested that this is probably a case of introduction. Résumé Nemastoma dentigerum Canes...
Article
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The mega-diverse haplogyne family of goblin spiders (Oonopidae Simon, 1890) has long been among the most poorly known families of spiders. However, since the launch of the goblin spider Planetary Biodiversity Inventory project knowledge about Oonopidae is rapidly expanding. Currently, Oonopidae is placed within the superfamily Dysderoidea and is di...
Article
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Three new Eustala species are described from the Galapagos archipelago: Eustala occidentalis sp. nov. with a western distribution, Eustala orientalis sp. nov. with an eastern distribution and Eustala meridionalis sp. nov. with a distribution restricted to the southern island Floreana.
Article
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Arachnids were collected by means of pitfall traps between March and December 2010 and between March and September 2011 by means of a Malaise trap along the edge of a deciduous woodland bordering a marshy valley located at Viesville. The phenology of the 21 species with highest activity density (data of pitfall traps) is given. Those data are compa...
Article
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Thirteen centipeds, eleven millipeds and one symphylan species are reported from the Galápagos islands. Six centipeds (Cryptops beebei Chamberlin 1924, Nannopodellus purpurescens Chamberlin 1924, Pachymerium pereirai Shear & Peck 1992, Pectiniunguis albemarlensis Chamberlin 1914, Pectiniunguis kraussi Shear & Peck 1992, Schendylops nealotus (Chambe...
Article
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A synthesis is given of 30 years of galapagoan spider fauna research, including an historical overview of spider sampling in the archipelago. A total of 11,437 specimens originating from 688 sampling localities are analyzed. In total 175 spider species are reported of which 152 could be identified or were described as new. The remaining 23 species...
Article
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Two new species of Thomisidae are described (Mecaphesa reddelli sp. nov. and Tmarus galapagosensis sp. nov.). Of a third species, Mecaphesa inclusa (Banks, 1902), three colour variations are described. Tmarus specimens previously listed from the islands have always erroneously been called T. stolzmanni Keyserling, 1880. The Philodromidae are mentio...
Article
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We mention the rediscovery of the very rare carabid beetle Pogonus luridipennis (Germar, 1822) in the IJzer Estuary in Nieuwpoort in the spring of 2007. Samenvatting We vermelden de herontdekking van de zeer zeldzame loopkeversoort Pogonus luridipennis (Germar, 1822) in het IJzer estuarium te Nieuwpoort in de lente van 2007. Résumé Nous mentionnons...
Article
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Within island archipelagos, repeated ecological settings may lead to radiations wherein similar niches are recurrently occupied. Although it has been shown that species with common habitat requirements share particular traits, it remains relatively unexplored to what extent this may lead to the repeated evolution of almost identical phenotypes (phe...
Article
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Based on a survey of a wide variety of oonopid genera and outgroups, we hypothesize new synapomorphies uniting the Oonopidae (minus the South African genus Calculus Purcell, which is transferred to the Orsolobidae). The groundplan of the tarsal organ in Oonopidae is hypothe sized to be an exposed organ with a distinctive, longitudinal ridge origina...
Article
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Cette note donne un aperçu de la faune arachnologique (araignées et opilions) d'anciens sites carriers et calaminaires situés en province de Liège (Belgique). La répartition des espèces entre les stations et l'effet du reboisement sur cette faune sont étudiés. Une comparaison avec les résultats déjà obtenus pour d'autres groupes d'Arthropodes (Hété...
Article
Within most island archipelagos, such as the Galápagos, similar ecological gradients are found on geographically isolated islands. Species radiations in response to these ecological gradients may follow different scenarios being (i) a single habitat specialization event followed by secondary colonization of each ecotype on the different islands or...
Article
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The paper reports on a collection of Clubionidae (s.l.) of canopy dwelling Clubionidae. Two new Matidia (Clubionidae, Araneae) species (males and females), Matidia missai and Matidia strobbei are described. Two new genera are proposed: Arabellata with two new species A. nimispalpata and A. terebrata, and Invexillata with three new species, 1. macul...
Article
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The colonization of species on remote islands may result in phenotypic diversification and ultimately speciation. On the Galápagos Archipelago, seven very closely related morpho-species of the wolf spiders genus Hogna are distinguishable based on small somatic and genital differences. Based on habitat preference, these species can broadly be catego...
Article
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An analysis of the spider assemblage structure and the presence of indicator species in the Flemish coastal dunes are presented. The analysis is based on data from more than 170 year-round pitfall sampling campaigns from the 1970s onwards. We were able to find indicator species for all identified habitats. The assemblages are determined by variatio...
Article
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This contribution reports on the discovery of Calleida migratoria Casale, new species, a ground beetle previously unknown to the Galápagos Islands. Since the recent and very strong 1997–98 El Niño event we have found this species on five of the Galápagos Islands: Isabela, Pinta, Santa Cruz, Santiago and Rabida. The species is also known from Peru a...
Article
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Specimens of the genus Pteroneta (Deeleman, 2001) were studied from fogging samples from Papua New Guinea. Four new species are described (males and females) and compared with type material from the region (P. saltans Deeleman): Pteroneta longichela, P. brevichela, P. baiteta and P. madangiensis. Detailed morphological description and fi gures of m...
Article
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Abstract Populations of ground beetles and spiders are continuously monitored since 1990 in the dunes and salt marshes of the river Ijzer estuary (Belgium), where a recent nature restoration project took place within the framework of LIFE. Immediately after restoration measures, continuous (year cy- cle) pitfall and window,trapping was performed,du...
Article
Full-text available
We monitored the spider and ground beetle assemblages of old dune and newly created dune-like habitats in the Ijzer estuary by means of four years of continuous pitfall sampling (2001-2004). The new sites built with dune sand were rapidly colonised by good dispersing species. These populations thrived so well during the first years after colonisati...
Article
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Species distribution patterns have been explained by Hutchinson's niche theory, metapopulation theory and source-sink theory. Empirical verification of this framework, however, remains surprisingly scant. In this paper, we test the hypothesis that landscape characteristics (patch size and connectivity), aerial dispersal ability and niche breadth in...
Article
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Oedothorax gibbosus is a dwarf spider bound to oligo- and mesotrophic alder carrs. Two male morphs occur: gibbosus, characterised by a hunch and a hairy groove on its carapace, and tuberosus without these features. The hairy groove is supposedly of importance during gustatorial courtship behaviour. Earlier studies indicated that this dimorphism was...
Article
Diversity, composition and community structure of terrestrial macroinvertebrates were compared along an altitudinal gradient on Volcán Alcedo (Isabela, Galápagos), sampled at nine sites in April 1986 and 1996. This volcano has recently suffered a population explosion of introduced feral goats, which have transformed large parts of the former forest...
Article
Full-text available
During a recent expedition to Easter Island, we collected many carabid beetles by intensive pitfall trapping, time standardized hand collecting and light trapping. The beetles were Notiobia (Anisotarsus) cupripennis Germar and Metius chilensis Dejcan. We review the current knowledge of these presumably introduced species including their detailed di...
Article
The spider fauna of oceanic islands in the Pacific (Galapagos, Juan Fernandez, Easter Island, Marquesas, Hawaii), the Atlantic (Saint Helena) and the Indian Ocean (Comoros, Seychelles) is analysed. Family composition, size frequency distribution, species/area relationship, the origin of the faunas and their qualitative compositions are discussed. T...
Article
The various vegetation zones of the central Galapagoan island, Santa Cruz, have been sampled for spiders on three occasions, in 1982, 1986 and 1988. This paper deals with the synecological analyses (DECORANA, TWINSPAN) of the spider composition of the different vegetation zones of the island. There is an important variation in the composition of th...
Article
Full-text available
A number of heath parcels differing from each other in management type and age were sampled by means of pitfall traps: mown heathland with and without removal of litter, burnt heath, young and old Calluna vulgaris stands. Another set of data was obtained by a more detailed sampling of places with a different horizontal structure of the Calluna vege...

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Project (1)
Project
Since 2014, several entomofauna groups are monitored in a large number of heathland patches near Bruges. Most of these patches are dominated by Calluna vulgaris and Erica cinerea. The sampled sites differ in history, age of the heathland, management, surface, surrounding vegetation and isolation. Spiders and insects are sampled mainly by pitfall traps, which are placed at the sites for at least 12 months. Until now more than 40 different insect and other invertebrate groups were sorted out and identified. For some groups many rare species were discovered and seem to have vital populations in these patches. Some species are even very rare and threatened in Flanders and for these species the heathlands near Bruges are very important in their survival.