Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailClimatic differentiation of the invasive alien plant Senecio inaequidens (Asteraceae) during invasion
Monty, Arnaud ULg; Mahy, Grégory ULg

Conference (2007)

Despite the problems they cause, biological invasions represent a great opportunity to study large-scale plant evolution, e.g. in response to changing climate. Senecio inaequidens DC. is an herbaceous ... [more ▼]

Despite the problems they cause, biological invasions represent a great opportunity to study large-scale plant evolution, e.g. in response to changing climate. Senecio inaequidens DC. is an herbaceous perennial originating from South Africa. It was introduced as a wool alien in a few precise locations about one century ago and after a lag phase of several decades, started to spread rapidly throughout Europe and its contrasted climate. Our study uses common garden experiments to assess the differentiation of the species along both altitudinal and climatic gradients. Life history traits are measured and linked to climatic conditions of source populations. Results show that the species evolved along a climatic gradient from the Mediterranean to the high Pyrenean. This along-invasion differentiation can be linked to mean temperature evolution along the gradient and shows how an introduced species can potentially develop adaptations to new encountered thermic conditions in a length of time of several decades. How understanding the adaptive response of a plant to new climatic conditions will help anticipating the potential response of the flora to climate change is discussed. [less ▲]

Detailed reference viewed: 9 (3 ULg)
Peer Reviewed
See detailClimatic environment and air quality in breeding pig houses
Debliquy, P.; Nicks, Baudouin ULg; Canart, B. et al

in proceedings of the annual conference of the Association of Veterinary Teachers and Research Workers (1991)

Detailed reference viewed: 4 (0 ULg)
Full Text
Peer Reviewed
See detailClimatic factors, time activity budget and breeding success of the Spanish sparrow (Passer hispaniolensis TEMM.)
Metzmacher, Maxime ULg

in Pinowski, Jan; Summers-Smith, J. Denis (Eds.) Granivorous birds in the agricultural landscape: Proceedings of General Meetings of the Working Group on Granivorous Birds, INTECOL : The Ottawa, Canada, June 28, 1986 and Syracuse, New York, USA, August 13, 1986 (1990)

This study examines the influence of environmental factors and time budget on reproductive success of Spanish Sparrows (Passer hispaniolensis Temm.). Work was conducted in 1983 in a large cerealiculture ... [more ▼]

This study examines the influence of environmental factors and time budget on reproductive success of Spanish Sparrows (Passer hispaniolensis Temm.). Work was conducted in 1983 in a large cerealiculture zone in Western Algeria. Nest construction was carried out primary by males. The males also spent more time in nest defense than females. Nest construction was more frequent in the morning, but display was more frequent in the afternoon. Both sexes shared incubation. When left alone, or not regurlaly relieved, females extended their contribution to incubation. Males incubated less during windy conditions. Time spent brooding depended on age of nestlings and weather conditions. Females spent more time in these activities than males. Initially, the contribution by males to feeding young was comparable to that of females, though at the end of the brooding period it ofen diminished. When wind was strong or temerature high nestling feeding rates decreased. The wind appears to be the climatic factor that most influenced the activities and reproductive success of the sparrows in this study. [less ▲]

Detailed reference viewed: 22 (6 ULg)
Peer Reviewed
See detailClimatic influence on black grouse population dynamic in Belgian Hautes-Fagnes : an update.
Loneux, Michèle ULg; Lindsey; Vandiepenbeek et al

Conference (2003)

Detailed reference viewed: 2 (0 ULg)
Full Text
Peer Reviewed
See detailClimatic influence on black grouse population dynamic in Belgian Hautes-Fagnes.
Loneux, Michèle ULg; Lindsey, James ULg; Vandiepenbeeck, Marc et al

in Sylvia (2003), 39(supplement), 53-57

Detailed reference viewed: 28 (5 ULg)
Peer Reviewed
See detailClimatic influence on black grouse population dynamic in Belgian Hautes-Fagnes.
Loneux, Michèle ULg; Lindsey, J.K.; Vandiepenbeek, M. et al

Conference (2003)

Detailed reference viewed: 4 (3 ULg)
Full Text
Peer Reviewed
See detailClimatic Modelling of Black Grouse population dynamics: a game or a tool?
Loneux, Michèle ULg; Lindsey, James ULg

in Sylvia (2003), 39(supplement), 43-52

Detailed reference viewed: 9 (1 ULg)
See detailClimatic response to solar variability: simulations with a seasonal energy balance model
Gérard, Jean-Claude ULg

in Proceedings of the 28th Liège International Astrophysical Colloquium (1989)

Detailed reference viewed: 5 (2 ULg)
See detailClimatic warming due to increasing trace gases: simulations with a seasonal energy balance model
Hauglustaine, Didier A.; Gérard, Jean-Claude ULg; Brasseur, G.

in Proceedings of the 28th Liège International Astrophysical Colloquium (1989)

Detailed reference viewed: 2 (1 ULg)
Full Text
Peer Reviewed
See detailClimatological characteristics of NDVI time series: challenges and constraints
Horion, Stéphanie; Tychon, Bernard ULg; Cornet, Yves ULg

in Bulletin de la Société Géographique de Liège (2010), 54

Many studies already investigated the impact of climate change and climate variability on vegetation at global and continental scales. Low resolution satellite imagery is one of the main sources of ... [more ▼]

Many studies already investigated the impact of climate change and climate variability on vegetation at global and continental scales. Low resolution satellite imagery is one of the main sources of information. In this paper, we describe a strategy to improve the quality of 10-daily time series of Normalized Difference Vegetation Index derived from SPOT-VEGETATION. A specifi c methodology was also defi ned in order to identify optimal test sites for the analysis of climate control on intra-annual dynamic of croplands. Finally two cases studies are presented to illustrate this research and in particular the non linear relationship between NDVI and meteorological parameters during the growing season. [less ▲]

Detailed reference viewed: 65 (10 ULg)
Full Text
Peer Reviewed
See detailClimatological influences on inland waterway transport capacity
Cools, Mario ULg; Limbourg, Sabine ULg

Conference (2014)

Climate change may affect inland waterway transport through disturbances in waterway hydrology: longer periods with strong water swells and drops. To allow fully loaded barges, the water level must be ... [more ▼]

Climate change may affect inland waterway transport through disturbances in waterway hydrology: longer periods with strong water swells and drops. To allow fully loaded barges, the water level must be neither too high (limited air draught) nor too low (limited draught). Therefore, the water level impacts the load factor of barges and thus the transportation costs. Moreover, in winter, ice jams can paralyze inland waterway traffic on the river. In this paper, the effect of various climatological changes on the capacity of inland waterway in terms of barge transport is examined. The paper focusses on the development of a methodology for assessing the sensitivity of inland waterway systems to climatological changes and takes into account an experts' opinion survey that provides insight into the perceived likelihood of the different scenarios that are investigated. The analysis focusses on the inland waterway systems in Belgium, which has the second highest density of European inland waterways. It enables the integration of inland waterway transport in the intermodal supply chain. The results are related to investment planning and management in inland waterways transport. They are intended to be interesting to researchers and to inland waterways actors developing intermodal transport as well. [less ▲]

Detailed reference viewed: 44 (4 ULg)
Full Text
Peer Reviewed
See detailClimatological Mean and Decadal Change in Surface Ocean pCO2, and Net Sea-air CO2 Flux over the Global Oceans
Takahashi, Taro; Sutherland, Stewart C.; Wanninkhof, Rik et al

in Deep-Sea Research Part II, Topical Studies in Oceanography (2009), in press

Detailed reference viewed: 95 (7 ULg)
Full Text
Peer Reviewed
See detailClimatological study of ionospheric irregularities over the European mid-latitude sector with GPS
Wautelet, Gilles ULg; Warnant, René ULg

in Journal of Geodesy (2014), 88(3), 223-240

High-frequency variability of the ionosphere, or irregularities, constitutes the main threat for real-time precise positioning techniques based on Global Navigation Satellite Systems (GNSS) measurements ... [more ▼]

High-frequency variability of the ionosphere, or irregularities, constitutes the main threat for real-time precise positioning techniques based on Global Navigation Satellite Systems (GNSS) measurements. Indeed, during periods of enhanced ionospheric variability, GNSS users in the field – who cannot verify the integrity of their measurements – will experience positioning errors that can reach several decimeters, while the nominal accuracy of the technique is cm-level. In the frame of this paper, a climatological analysis of irregularities over the European mid-latitude region is presented. Based on a ten year GPS dataset over Belgium, the work analyzes the occurrence rate (as a function of the solar cycle, season and local time) as well as the amplitude of ionospheric irregularities observed at a single GPS station. The study covers irregularities either due to space weather events (solar origin) or of terrestrial origin. If space weather irregularities are responsible for the largest effects in terms of ionospheric error, their occurrence rate highly depends on solar activity. Indeed, the occurrence rate of ionospheric irregularities is about 9% during solar maximum, whereas it drops to about 0% during medium or low solar activity periods. Medium-Scale Ionospheric Disturbances (MSTIDs) occurring during daytime in autumn/winter are the most recurrent pattern of the time series, with yearly proportions slightly varying with the solar cycle and an amplitude of about 10% of the TEC background. Another recurrent irregularity type, though less frequent than MSTIDs, is the noise-like variability in TEC observed during summer nighttime, under quiet geomagnetic conditions. These summer nighttime irregularities exhibit amplitudes ranging between 8 and 15% of the TEC background. [less ▲]

Detailed reference viewed: 54 (12 ULg)
See detailClimatologie - Topoclimatologie
Erpicum, Michel ULg

Book (2008)

Detailed reference viewed: 46 (18 ULg)
See detailClimatologie : analyse des nuages vus de l'espace
Erpicum, Michel ULg

in Wilmet, Jules (Ed.) Télédétection satellitaire (1987)

Detailed reference viewed: 21 (1 ULg)
Full Text
Peer Reviewed
See detailLa climatologie
Erpicum, Michel ULg; Alexandre, Jean ULg

in Bulletin de la Société Géographique de Liège (2003), 43(2003), 79-88

Detailed reference viewed: 30 (6 ULg)
Peer Reviewed
See detailClimatology
Erpicum, Michel ULg

in Bulletin de la Société Belge d'Etudes Géographiques = Tijdschrift van de Belgische Vereniging voor Aardrijkskundige Studies (1996), 64 (2)

Detailed reference viewed: 12 (1 ULg)
Full Text
See detailClimatology and circulation of the Azores-Canary region by Data-Interpolation Variational Analysis
Troupin, Charles ULg; Machín, Francisco; Ouberdous, Mohamed ULg et al

Poster (2008, June 02)

Detailed reference viewed: 16 (0 ULg)