Results 41 to 50 of about 11,991 (140)

Variations spatio-temporelles des matieres en suspension dans I'estuaire du Sinnamary, Guyane française: influence du barrage hydroélectrique de Petit Saut [PDF]

Revista Brasileira de Oceanografia, 2000
The coast of Prench Guiana is subjected to the Amazon dispersal system, which is influenced by oceanic currents and trade winds ruled by the position of the Intertropical Convergence Zone. The Sinnamary is one of the major French Guiana rivers. Since 1994, the hydroelectric dam of "Petit Saut" has modified the hydrological regime and the ecological ...
Oliveira, Carlos J. Maia de, Clavier, Jacques   +1 more
openaire   +3 more sources

Pollinator functional group abundance and floral heterogeneity in an agroecological context affect mating patterns in a self‐incompatible wild plant

American Journal of Botany, Volume 111, Issue 12, December 2024.
Using a farm‐scale experiment, we investigated how the mating outcomes (expected heterozygosity and paternity correlation) of Cyanus segetum in agroecological infrastructures (herbaceous field margins) are affected by the interplay between pollinator functional group abundance and, respectively, the relative maternal plant attractiveness and the local ...
Audrey Labonté, Valérie Le Corre, Annick Matejicek, Emeline Felten, Mélinda Turpin, Emilien Laurent, Séverine Michel, Chantal Ducourtieux, Eric Vieren, Willem Proesmans, Violaine Deytieux, Stéphane Cordeau, Adam J. Vanbergen   +12 more
wiley   +1 more source

Influence de la déforestation sur le fonctionnement hydrologique de petits bassins versants tropicaux [PDF]

, 1998
Les régions tropicales subissent une déforestation importante. En Amérique du Sud,la forêt est généralement remplacée par une prairie, C'est pourquoi nous avons étudié le comportement hydrologique de 2 petits (1,5 ha) bassins versants.
Bariac, T., Boulegue, J., Grimaldi, C., Grimaldi, M., Hubert, P., Millet, A., Molicova, H.   +6 more
core   +1 more source

Diversity, habitat and activity patterns of mesocarnivore assemblages in an Afrotropical protected forest savannah mosaic of Central Cameroon

African Journal of Ecology, Volume 62, Issue 3, September 2024.
Abstract Little is known about the diversity and ecology of mesocarnivores in the Mpem and Djim National Parks in central Cameroon. Therefore, we undertook a rapid assessment using camera traps from September 2021 to December 2021. The main objective of our study was to collect data on the diversity, abundance and relative frequency of mesocarnivores ...
Ernest D. B. Fotsing, Meigang M. F. Kamkeng, Salah Marcel Senge, Dietmar Zinner   +3 more
wiley   +1 more source

Variations spatio-temporelles du zooplancton d'un estuaire hyperhalin : la Casamance

, 1987
La Casamance est un fleuve côtier du sud du Sénégal (Afrique de l'Ouest) pourvu d'une zone estuarienne relativement vaste. Le déficit pluviométrique de ces deux dernières décennies, combiné à une forte évaporation a contribué à une augmentation anormale de la salinité laquelle atteint 172 °/°° en amont, en fin de saison sèche 1986.
Diouf, P.S., Diallo, A.
openaire   +1 more source

Le suivi du régime hydrologique des grands fleuves de l'Ouest Africain : apport de l'imagerie satellitaire NOAA/AVHRR [PDF]

, 1992
Le Projet, « suivi de la végétation en zone tropicale » de l'Institut des Applications de la Télédétection au Centre Commun de Recherche des Communautés Européennes d'lspra, a mis au point et alimente en permanence une banque de données satellitaires ...
Geffard, S., Gregoire, J. M., Pieyns, S.
core   +1 more source

Community‐science reveals delayed fall migration of waterfowl and spatiotemporal effects of a changing climate

Journal of Animal Ecology, Volume 93, Issue 4, Page 377-392, April 2024.
Using 43 years of community‐science data, the authors found significant changes in the fall migration phenology for 12/15 waterfowl species, with most species shifting migration later in the season. When and where climate was correlated with phenological shifts differed among species, highlighting the importance of scale in climate research.
Barbara Frei, Amelia R. Cox, Ana C. Morales, Christian Roy   +3 more
wiley   +1 more source

Composition et variations spatio-temporelles du régime alimentaire de Trachurus trachurus (Carangidae) de la côte atlantique marocaine

, 2015
A study of the diet of the Atlantic horse mackerel Trachurus trachurus (Linnaeus, 1758) was carried out on the Atlantic coast of Southern Morocco, located from Cap Boujdour to Cap Blanc (26 degrees 30'N-21 degrees N latitude). This area is characterized by a permanent upwelling and is among the highly productive ecosystems of the worldwide ocean.
Wahbi, F., /Le Loc'h, François, Berreho, A., Benazzouz, A., Ben Mhmed, A., Errhif, A.   +5 more
openaire   +3 more sources

La diffusion de la "géographie théorique et quantitative" en France : quel modèle de diffusion spatiale ?

, 2014
International audienceThe spread of “theoretical and quantitative” geography in France: which model of spatial diffusion?The localization of research centers in theoretical and quantitative geography is highly asymmetrical.
Commenges, Hadrien, Cuyala, Sylvain
core   +2 more sources

Crop phenology reshapes the food‐safety landscape for roe deer in an agroecosystem

Journal of Applied Ecology, Volume 61, Issue 3, Page 564-574, March 2024.
Our work highlights the importance of behavioural plasticity and habitat complementation in the persistence of this synanthropic species in agroecosystems. This behavioural adjustment may buffer the consequences of the reduction in natural habitats that accompanies intensification of agricultural production and has implications for understanding how ...
Noa Rigoudy, Simon Chamaillé‐Jammes, A. J. Mark Hewison, Arnaud Bonnet, Yannick Chaval, Bruno Lourtet, Joël Merlet, Nicolas Morellet   +7 more
wiley   +1 more source