Evaluation of biogeochemical reactivity of fresh and weathered contaminated dredged sediments     

Couvidat  Julien  Neculita  Carmen Mihaela  Benzaazoua  Mostafa  Genty  Thomas  Chatain  Vincent 《Journal of Soils and Sediments》2017,17(2):543-556

Journal of Soils and Sediments - Metal mobility in contaminated marine sediments is largely controlled by low-soluble sulfides. In dredged sediments exposed to air and water, geochemical and...  相似文献   

IMAGING DIAGNOSIS—MAGNETIC RESONANCE IMAGING AND HISTOPATHOLOGICAL FEATURES OF A SKULL BASE CHORDOMA IN A CAT          下载免费PDF全文

Josep Brocal  Virginia Gamino  Julien Guevar  Rodrigo Gutierrez‐Quintana  Francesco Marchesi  Gawain Hammond  Catherine Stalin 《Veterinary radiology & ultrasound》2017,58(2):E11-E15

An 8‐year‐old domestic short‐haired cat was presented with anorexia, lethargy, ataxia and one episode of consciousness loss. A midline vertically orientated, biconcave, extra‐axial mass originating from the basioccipital bone was detected on magnetic resonance images of the head. The mass was T1W iso‐ to hypointense when compared with normal grey matter, T2W hyperintense with small areas of isointensity and heterogeneously enhanced with contrast. Multiple signal voids were observed on T2^* images. Histopathological evaluation confirmed a chordoma. To the authors’ knowledge this is the first report of the imaging characteristics of a chordoma affecting the skull base in a cat.  相似文献   

Vertebral venous system abnormalities identified with magnetic resonance imaging in sighthounds          下载免费PDF全文

John C. Vernon  Alexane Durand  Julien Guevar  Roberto José‐López  Gawain Hammond  Catherine Stalin  Rodrigo Gutierrez‐Quintana 《Veterinary radiology & ultrasound》2017,58(4):399-410

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Comparison of albumin,colloid osmotic pressure,von Willebrand factor,and coagulation factors in canine cryopoor plasma,cryoprecipitate, and fresh frozen plasma          下载免费PDF全文

Christine A. Culler DVM  MS  DACVECC  Cristina Iazbik MV  Julien Guillaumin DV  DACVECC  DECVECC 《Journal of Veterinary Emergency and Critical Care》2017,27(6):638-644

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Predicting weed distribution at the regional scale in the native range: environmental determinants and biocontrol implications of Phyla nodiflora (Verbenaceae)          下载免费PDF全文

A J Sosa  M V Cardo  M H Julien 《Weed Research》2017,57(3):193-203

Alien plants produce severe environmental and economic losses in the territories they invade. Modelling the spatial distribution of alien species as a function of the environment in the native range has therefore become an essential first step in the struggle against invasions. Phyla nodiflora var. minor is a fast‐growing perennial herb native to South America that has spread through three continents, where it poses a major threat to biodiversity and significantly impacts on conservation and grazing systems, mainly in riparian areas. To assess the distribution of native Argentine populations of P. nodiflora as a function of the environment, we conducted long‐term roadside surveys and associated the occurrence of the plant with climatic, geographical, demographical and vegetation cover variables in a generalised linear mixed model. The plant was recorded in 230 of 431 sites, mostly east of 66°W and north of 39°S. According to the best model, which predicted the data 58% better than random assignment, its occurrence was associated with temperature variables (mean annual values and daytime range) and relative humidity. Based on these associations, we generated a presence probability map for the occurrence of P. nodiflora in southern South America. Understanding the environmental determinants of the distribution of weeds in their native range provides valuable baseline data to further manage the spread of alien species.  相似文献   

Habitat partitioning among three predatory fish in a temperate reservoir     

Samuel Westrelin  Julien Cucherousset  Romain Roy  Laurence Tissot  Frdric Santoul  Christine Argillier 《Ecology of Freshwater Fish》2022,31(1):129-142

The diversity of predatory species plays a key role in ecosystem functioning but our understanding of the mechanisms underlying their coexistence is limited, particularly in freshwater ecosystems. Northern pike Esox lucius, European perch Perca fluviatilis and pikeperch Sander lucioperca are three widespread predatory species in European lakes, where they often coexist. As potential competitors, we hypothesised that partitioning habitat is a determinant of species coexistence. This was tested by quantifying the variability of their habitat use in tracking adult individuals in the Bariousses reservoir (France, 86.6 ha, mean depth 7.1 m). Specifically, we investigated their distribution along the littoral–pelagic and depth axes along the daily cycle and across seasons. From littoral to pelagic waters were first found pike, then perch and finally pikeperch. Pike was the closest to the surface while pikeperch was the deepest. This general pattern was, however, variable across seasons with the three species located in the upper layer in summer during reservoir stratification. Individuals were more evenly distributed along the littoral–pelagic axis and closer to the bottom when water was mixing (autumn, winter). In summer, perch used more intensively in the pelagic zone during the daytime. Other species did not show any diel change of habitats. Our results highlighted that species coexistence is associated with habitat partitioning among these three predators, with perch showing a more variable behaviour regarding habitat characteristics. Now more than ever, in the context of global change which modifies habitats, it is of crucial importance to understand the coexistence mechanisms of species that shape ecosystems.  相似文献