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排序方式: 共有130条查询结果,搜索用时 31 毫秒
71.
Anne Pinton Julia Boubnova François Becmeur Pierre Kuhn Marie-Victoire Senat Julien Stirnemann Marianne Capelle Jonathan Rosenblatt Jérôme Massardier Pascal Vaast Gwenaelle Le Bouar Amélie Desrumaux Laure Connant Laetitia Begue Benoit Parmentier Franck Perrotin Alain Diguet Guillaume Benoist Charles Muszynski Aurélien Scalabre Norbert Winer Jean-Luc Michel Florence Casagrandre-Magne Jean-Marie Jouannic Denis Gallot Perrine Coste Mazeau Emmanuel Sapin Alexis Maatouk Anne-Hélène Saliou Loïc Sentilhes Florence Biquard Nicolas Mottet Romain Favre Alexandra Benachi Nicolas Sananès 《黑龙江环境通报》2020,40(8):949-957
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Scent-marking is a frequent behaviour of highly social ground squirrels and might play an important role in their social dynamics.
Female Columbian ground squirrels exhibit considerable scent-marking during the reproductive period. We examined how gestating
and lactating females responded to jugal gland scent-marks of same-sexed and opposite-sexed conspecifics with attention to
genetic relatedness and the geographical location of the territory of individuals. We tested the dear-enemy, threat-level
and kin-discrimination hypotheses to explain patterns of scent-marking. Females sniffed the scent of non-neighbouring males
significantly longer than other types of scent categories and tended to over mark the scent of females more than the scent
of males. Furthermore, females sniffed significantly longer at scents during gestation than during lactation. We concluded
that scent-marking mainly functioned in the defence of female territories and for protection of pups against infanticidal
females (threat-level hypothesis). Our results were also in accordance with the kin-discrimination hypothesis, because greater
attention was paid to the marks of non-kin females. Kin females might not pose an infanticidal threat, perhaps explaining
greater tolerance among related reproductive females. We concluded that scent-marking may be a relatively low-cost means of
territorial defence, as well as a means of communication of aspects of individual identity. 相似文献
76.
Katarzyna Wojczulanis-Jakubas Dariusz Jakubas Julien Foucher Joanna Dziarska-Pałac Hubert Dugué 《Die Naturwissenschaften》2013,100(11):1095-1098
Relatively little attention has been paid to sex differences in the migration of birds in autumn. We studied the autumn migration strategy of molecularly sexed males and females in the globally threatened aquatic warbler Acrocephalus paludicola. We captured 176 birds at a stopover site in the Loire estuary at Donges, France. The median date for the passage of adults was 8 days earlier in males than females, although the timing of migration in first-year males and females was similar. This indicates that males, who are without parental duties, can start their migration earlier than females and first-year birds. Adults were significantly heavier than immature birds but did not have higher fat scores. In both age categories, more males (two to three times more) were captured. However, various factors (including tape-luring) can affect observed sex ratio. 相似文献
77.
Julien Saada Anne-Gaëlle Grebille Marie-Cécile Aubry Arash Rafii Yves Dumez Alexandra Benachi 《黑龙江环境通报》2004,24(8):627-630
Congenital adrenal hyperplasia (CAH) is an autosomal recessive disorder with an incidence of 1/15 000. More than 90% of CAH cases result from mutations of CYP21, leading to 21-hydroxylase deficiency. In its classical form, CAH is severe and consists of the virilizing (increase of androgens) and salt-wasting (lack of aldosterone) phenotype. When a proband exists, early prenatal diagnosis for CAH can be performed by direct molecular analysis in the first trimester. We describe herein two cases suggesting that the prenatal diagnosis of CAH can be initiated by the sonographic appearance of the adrenal gland at the second-trimester scan in the absence of a family history. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
78.
Haematological parameters as predictors of blood lead and indicators of lead poisoning in the black duck (Anas rubripes) 总被引:2,自引:0,他引:2
Pain DJ 《Environmental pollution (Barking, Essex : 1987)》1989,60(1-2):67-81
The validity of various haematological parameters as indicators of blood lead concentration and lead poisoning in the black duck (Anas rubripes) is discussed. Elevated (> 40 microg dl(-1)) blood lead (PbB) levels were recorded in 41% of the 229 wild birds examined. No correlation was found between PbB concentration and haematocrit. Zinc protoporphyrin (ZPP) was positively correlated with PbB. Haemoglobin, delta-aminolevulinic acid dehydratase (ALA-d) activity and non-activated/activated ALA-d ratios were negatively correlated with PbB. The minimum PbB levels at which these parameters were affected varied greatly. ZPP and haemoglobin were relatively insensitive to PbB concentrations; whilst ALA-d activity and ALA-d ratio were influenced by PbB concentrations of < 5 microg dl(-1). Log(10) ALA-d ratio was more strongly correlated with PbB (r = -0.953) than log(10) ALA-d activity (r = -0.914) and the predictive validity (% false -ve and +ve predictions) of the ratio method was higher. The high individual variability in ALA-d activities at low PbB levels was greatly reduced by the use of the ALA-d ratio method. The ALA-d ratio method proved the most efficient for screening black duck for lead poisoning in the field. 相似文献
79.
Bernard Guyot Anne Bazin Yvette Sole Christophe Julien Fernand Daffos François Forestier 《黑龙江环境通报》1988,8(7):485-493
We have used a Y-chromosome specific DNA probe in a controlled study to determine the presence of Y-chromosome material and to detect numerical abnormalities in uncultured amniotic fluid cells by fluorescent hybridization. Using this non-radioactive method, we correctly predicted fetal sex within 48 h in all but 3 of 54 cases and identified an XYY syndrome. The technique was previously tested with no false-positive or false-negative results on cultured interphase or metaphase nuclei of fetal fibroblasts and adult T-lymphocytes. Fluorescent in situ hybridization was applied to long-term fixed cytogenetic preparations up to 44 months old and was shown to be reliable. 相似文献
80.
Changes in agricultural land use are responsible for significant modifications in mountain landscapes. This study is part
of an interdisciplinary research on the processes and consequences of spontaneous afforestation of Pyrenean landscapes by
ash, and the possibilities for its management. We address the relationships between vegetation dynamics and land-use change
from the combination of an agricultural study of change in farm management and an ecological study of grassland colonization
by ash. In the framework of a village case study, we characterized parcels management and land-use histories, and analyzed
the dynamics of the composition of grassland vegetation communities. From a joint analysis of the results obtained in each
discipline, we discuss the limitations and complementarities of the two approaches for the interdisciplinary assessment of
the afforestation process. 相似文献