Geographic ecology of soil oribatid mites in deciduous forests

in Pedobiologia (1989), 33(6), 399-416

On a broad, geographic scale (Belgium), soil oribatid mites show relatively simple patterns of spatial distribution and habitat use since 2 groups of species can be defined: "regionally specialist' (RS ... [more ▼]

On a broad, geographic scale (Belgium), soil oribatid mites show relatively simple patterns of spatial distribution and habitat use since 2 groups of species can be defined: "regionally specialist' (RS) species which are rare and restrict their humus type occupancy, and "regionally generalist' (RG) species with reverse attributes. In the locality studied, 7/31 RS species inhabited all or nearly all the stands sampled and used widely disjunctive categories of habitat resources taking into account vertical location within organic layers (litter or humus), humus type (mor or moder) and vegetation (climax or secondary) developed in the study site. Nevertheless, their overlap on these categories was lower on average than the one of the 20 RG species which did not change their patterns on both geographic scales. Some of the 34 other RG species narrowed their local distribution and showed a clear specialization on the habitat categories. To explain the local/regional variations of patterns, it is proposed to interpret the regional distribution shown by soil oribatid mites in terms of tolerance to environmental factors. Then, it is advocated, the role of biotic interactions in the local widening of habitat breadth shown by the RS as well as RG species, and to produce a local non-equilibrium assemblage. -from Authors [less ▲]

Geographical allozymes differentiation in wild Phaseolus lunatus L. and its implication for conservation and management of populations

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2007), 11(4), 287-297

Geographical research in Belgium : remote sensing and photo-interpretation

in Bulletin de la Société Belge d'Etudes Géographiques (1995), 2

Geographical variation in sound production in the anemonefish Amphiprion akallopisos

in Proceedings of the Royal Society B-Biological Sciences (2005), 272(1573), 1697-1703

Because of pelagic-larval dispersal, coral-reef fishes are distributed widely with minimal genetic differentiation between populations. Amphiprion akallopisos, a clownfish that uses sound production to ... [more ▼]

Because of pelagic-larval dispersal, coral-reef fishes are distributed widely with minimal genetic differentiation between populations. Amphiprion akallopisos, a clownfish that uses sound production to defend its anemone territory, has a wide but disjunct distribution in the Indian Ocean. We compared sounds produced by these fishes from populations in Madagascar and Indonesia, a distance of 6500 km. Differentiation of agonistic calls into distinct types indicates a complexity not previously recorded in fishes' acoustic communication. Moreover, various acoustic parameters, including peak frequency, pulse duration, number of peaks per pulse, differed between the two populations. The geographic comparison is the first to demonstrate 'dialects' in a marine fish species, and these differences in sound parameters suggest genetic divergence between these two populations. These results highlight the possible approach for investigating the role of sounds in fish behaviour in reproductive divergence and speciation. [less ▲]

Géographie (de Fagne et Famenne) : les conditions physiques fondamentales, le paysage rural et les structures agricoles, l'habitat rural

in Architecture rurale de Wallonie, Fagne et Famenne (1988)

Géographie (de l'Ardenne Centrale) : les conditions physiques fondamentales, le paysage rural et les structures agricoles, l'habitat rural

in Architecture rurale de Wallonie. Ardenne Centrale (1987)

Géographie (de la Hesbaye namuroise) : les conditions physiques fondamentales, le paysage rural et les structures agricoles, l’habitat rural

in Architecture rurale de Wallonie. Hesbaye namuroise (1983)

Géographie (du Condroz) : les conditions physiques fondamentales, le paysage rural et les structures agricoles, l'habitat rural

in Architecture rurale de Wallonie, Condroz (1989)

Géographie (du Tournaisis) : les conditions fondamentales, le paysage rural et les structures agricoles, l’habitat rural

in Architecture rurale de Wallonie. Tournaisis (1984)

La géographie au service du développement local. Le bilan du Colloque de Liège (16-18 novembre 1995) de l'Association de Géographes Français

in Cahiers de Géographie du Quebec (1996), 40(111), 479-484

Summary of a symposium held in Liege from 16 to 18 November 1996 on the theme of local development