检索结果-南通市图书馆

Brain size and urbanization in birds

在线全文

学校读者我要写书评

暂无评论

Chinese Birds 2015年第2期6卷 92-98页

作者： Anders Pape Moller Johannes Erritzoe laboratoire d’ecologie Systématique et EvolutionCNRS UMR 8079Universite Paris-Sud Taps Old Rectory

Background: Brain size may affect the probability of invasion of urban habitats if a relatively larger brain entails superior ability to adapt to novel environments. However, once urbanized urban environments may provide poor quality food that has negative consequences for normal brain development resulting in an excess of individuals with small ***: Here we analyze the independent effects of mean, standard deviation and skewness in brain mass for invasion of urban habitats by 108 species of birds using phylogenetic multiple regression analyses weighted by sample ***: There was no significant difference in mean brain mass between urbanized and non-urbanized species or between urban and rural populations of the same species, and mean brain mass was not significantly correlated with time since urbanization. Bird species that became urbanized had a greater standard deviation in brain mass than non-urbanized species, and the standard deviation in brain mass increased with time since urbanization. Brain mass was significantly left skewed in species that remained rural, while there was no significant skew in urbanized species. The degree of left skew was greater in urban than in rural populations of the same species, and successfully urbanized species decreased the degree of left skew with time since urbanization. This is consistent with the hypothesis that sub-optimal brain development was more common in rural habitats resulting in disproportionately many individuals with very smal ***: These findings do not support the hypothesis that large brains promote urbanization, but suggest that skewness has played a role in the initial invasion of urban habitats, and that variance and skew in brain mass have increased as species have become urbanized.

关键词： Birds Brain mass Skewness in Brain Mass Standard deviation in Brain Mass Urbanization

determinants of quinolone resistance in Escherichia coli causing community-acquired urinary tract infection in Bejaia,Algeria

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2014年第6期7卷 462-467页

作者： Yanat Betitra Vinuesa Teresa Vinas Miguel Touati Abdelaziz laboratoire d'ecologie Microbiologie.Universite A/Mira de Bejaia Laboratory of Molecular Microbiology and Antibiotics Dept.Pathology and Experimental therapeutics.Medical SchoolUniversity of Barcelona

Objective:To investigate the mechanisms of quinolone resistance and the association with other resistance markers among Esherichia coli(***) strains isolated from outpatient with urinary tract infection in north of ***:A total of 30 nalidixic acid-resistant *** isolates from outpatient with urinary tract infections from January 2010 to April 2011 in north of Algeria(Bejaia) were *** susceptibility was determined by disc diffusion assay,minimal inhibitory concentrations(MIC) of quinolone were determined by *** in the Quinolone Resistance-determining Region(QRdR) of gyra and parC genes and screening for qnr(A,B and S) and bla genes were done by PCK and UNA ***:Most of the *** isolates(56.66%) were shown to carry mutations in gyrA and parC,igyra:Ser83Leu + Asp87Asn and parC:***.16.66 had only an alteration in gyrA:*** isolate produced qnrB-like and two *** isolates were CTXM-15 producers associated with TEM-1 producing in one ***-expression of bla_(LTV,M)_(15) and qnrB was determined in one *** ***:Our findings suggested the community emergence of gyrA and parC alterations and Qnr determinants that contributed to the development and spread of fluoroquinolone resistance in Algerian *** isolates.

关键词： Escherichia coli Community-acquired urinary tract infection QRdR Qnr ESBL

Vegetation structure,dominance patterns and height growth in an Afromontane forest,Southern Africa

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Forestry Research 2020年第2期31卷 453-462页

作者： Sylvanus Mensah Anthony Egeru Achille Ephrem Assogbadjo Romain GleleKakai laboratoire de Biomathematiques et d’Estimations Forestieres Facultedes Sciences AgronomiquesUniversite d’Abomey-Calavi04 BP 1525 CotonouBenin Regional Universities Forum for Capacity Building in Agriculture Makerere UniversityP.O Box 16811WandegeyaKampalaUganda laboratoire d’ecologie Appliquee Facultedes Sciences AgronomiquesUniversite d’Abomey-Calavi03 BP 1974 CotonouBenin

Information on forest structure is fundamentally important to track successional vegetation dynamics for efficient forest *** study reports on vegetation characteristics,dominance patterns and species height growth in a northern mistbelt forest type in South *** alpha-diversity indices(species richness and Shannon-Weiner diversity),structural vegetation parameters(tree density and basal area),and species importance value index were *** class distribution and height-diameter allometry were further examined for the overall stand and most important *** densities(472.0±43.5 and 605.3±28.1 trees ha^-1 for C 5 cm to\10 cm and C 10 cm dbh(diameter at breast height)classes,respectively)and basal area values(1.99±0.19 and 48.07±3.46 m^2 ha^-1,respectively)are comparable to other Afromontane forests in East *** overall stand showed an inverted-J shaped distribution pattern which is a typical feature of stand size class distribution in most natural *** ecologically important species also exhibited an inverted-J shaped distribution pattern,suggesting good regeneration and recruitment *** were significant differences in species on height,reflecting species-specific height growth patterns,possibly a result of intrinsic growth potential and competitive *** present study suggests that conservation and management policies,including protection of surrounding land uses against fire,contribute to maintaining a successful recovery of these ***,it should be noted that these forests may be experiencing relatively slow dynamic flux as a result of the overmature state of some trees with several years under relatively strict protection.

关键词： diversity Population structure Species composition Size class distribution

Water quality in forest and village ponds in Burkina Faso(western Africa)

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2017年第5期28卷 1039-1048页

作者： Bilass Zongo Frdric Zongo Aboubacar Toguyeni Joseph I.Boussim laboratoire de Biologie et ecologie Vgtales Universit de Ouagadougou Unit de Recherche Aquaculture et Biodiversit Aquatique laboratoire d'Etude et de Recherche sur les Ressources Naturelles et les Sciences Environnementales Universit Polytechnique de Bobo-Dioulasso

Forest ecosystems help conserve the quality of water resources in aquatic habitats. The conservation of biological diversity in aquatic and terrestrial ecosystems remains a communal concern. Aquatic ecosystems and resources are vulnerable but can be preserved and protected by forests. In sub-Saharan regions of Africa, water from ecosystems such as ponds still play important role in the livelihood of local populations. Water from temporary ponds is used by local populations for multiple needs; however, in this part of the world, the population is increasing, thus increasing human needs and activities and land use in the region. Land-use changes lead to deforestation, land degradation and the decline in freshwater, affecting human health and well-being. Forest degradation leads to the decline in ecosystem goods and services, particularly those related to watersheds. This study conducted in eastern Burkina Faso aimed to assess water quality of temporary ponds in protected forest areas (reserves) and surrounding villages. It was conducted in 61 temporary ponds where physical, chemical and biological variables were measured, such as water surface area, depth, transparency, macrophyte cover, pH, dissolved O2, conductivity, nutrient concentrations and algae biomass. The results showed that at p depth (p = 0.00), nutrient content (p = 0.00), and algae biomass (p = 0.04) were significantly higher outside reserves than inside reserves. In contrast, macrophyte cover (mean cover percentages 53 vs. 44.5%) and water transparency (p = 0.02) were higher inside reserves. The variations in conductivity and pH were not significant. All trends showed the influences of human activities on water characteristics and the role forests and land cover had in preventing negative human impacts and disturbance of temporary ponds. Forests and land cover are important to water quality conservation and algae biomass regulation in temporary ponds. Prot

关键词： Ecosystem services Pond water Reserves Variables Western Africa

Phosphorus mobility in dam reservoir affected by redox oscillations:An experimental study

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2019年第3期31卷 250-263页

作者： Anne Rapin Malgorzata Grybos Marion Rabiet Brice Mourier Véronique deluchat Université de Limoges PEIRENE EA 7500 Faculté des Sciences et Techniques Université de Lyon UMR5023 laboratoire d'ecologie des Hydrosystèmes Naturels et Anthropisés Université Lyon 1ENTPE CNRS

The internal sedimentary phosphorus(P) load of aquatic systems is able to support eutrophication, especially in dam–reservoir systems where sedimentary P stock is high and where temporary anaerobic conditions occur. The aim of this study therefore is to examine the response of sedimentary P exposed to redox oscillations. Surface sediments collected in the Champsanglard dam–reservoir(on the Creuse River, France) were subjected to two aerobic phases(10 and 12 days) alternated with two anaerobic periods(21 and 27 days)through batch incubations. The studied sediment contained 77 ± 3 μmol/g dW of P, mainly associated with the ascorbate fraction(amorphous Fe/Mn oxyhydroxides). The used sediment was rich in organic matter(OM)(21% ± 1%) with primarily allochthone *** results showed that redox oscillations enhance dissolved inorganic phosphorus release at sediment/water interface. during the first anaerobic stage, the P release was mainly controlled by the dissolution/precipitation of iron minerals. The more pronounced increase of P release during the second anaerobic stage(44%) was due to various mechanisms related to the change in quality of dissolved organic matter(dOM), namely a higher SUVA254 and humification indices. The release of more refractory dOM(rdOM) served to lower the microbial metabolism activity, possibly favored iron oxyhydroxide aggregation and thus limiting iron reduction. In addition, rdOM is able to compete for mineral P sorption sites,leading to a greater P release. In reservoir with predominant allochthone OM input, the release of more aromatic dOM therefore plays an important role in P mobility.

关键词： Phosphorus Sediment Redox Iron Organic matter

Morphological characterization and habitat suitability modeling of the goat population of Benin under climate change scenarios

在线全文

学校读者我要写书评

暂无评论

Ecological Processes 2022年第1期11卷 631-653页

作者： Habib Rainier Vihotogbe Whannou Cossi Ulriche Afatondji Côme Agossa Linsoussi Gnimansou Abraham Favi Thanh Thi Nguyen Marcel Romuald Benjamin Houinato Luc Hippolyte dossa Ecole des Sciences et Techniques de Production Animale Facultédes Sci-ences AgronomiquesUniversitéd’Abomey-CalaviAbomey-CalaviBénin laboratoire d’ecologie Appliquée Facultédes Sciences AgronomiquesUni-versitéd’Abomey-CalaviAbomey-CalaviBénin laboratoire de Botanique et ecologie Végétale Facultédes Sciences et TechniquesUniversitéd’Abomey-CalaviAbomey-CalaviBénin Organic Plant Production and Agroecosys-tems Research in the Tropics and Subtropics Organic Agricultural SciencesUniversity of KasselWitzenhausenGermany.

Background:Insufficient knowledge of the genetic and phenotypic diversity in the local Beninese goat population combined with the lack of understanding of its adaptive capacity to ongoing environmental and societal changes hampers the development of strategies for better management and genetic *** objective of this study was to establish the current geographical distribution of goats in Benin based on their morphology and model the potential habitat suitability of the three known main goat phenotypes(i.e.,djallonkégoat or TypeⅠ,Sahelian goat or TypeⅡ,and their Crossbreeds or TypeⅢ)under climate change *** qualitative and 26 linear body measurements were taken on 2114 adult female goats sampled across the three vegetation zones of the *** ratios were generated from the quantitative *** data were analyzed using generalized linear model procedures followed by multiple comparisons of least-squares means and multivariate analytical methods,including canonical discrimination analysis and hierarchical ascendant *** goat was then assigned to one of the three aforementioned main goat phenotypes following its morphological characteristics and according to the a priori cluster membership defined in the previous *** Maximum Entropy algorithm was used to model the current and future distribution of the three goat phenotypes under climate change scenario using the Representative Conservation Pathways 4.5 and ***:All linear body measurements varied among vegetation *** the discriminant function analysis,71%of the measured individuals were correctly classified in their vegetation zone of origin by seven measured variables and three *** cluster procedure analysis revealed two groups of goats subdivided into the three main *** modeling results showed that the currently highly favorable habitats were distributed in the South for TypeⅠ,in the North for TypeⅡ,and both South and North for Type

关键词： Capra hircus Climate change Ecological niche modeling Farm animal species MaxEnt model Morphology

Tree-ring:a suitable implement for spatial and temporal fire distribution analysis in savanna woodland and dry forest

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2015年第2期26卷 435-446页

作者： Franck Sinsin Romain GlèlèKaka? Bettina Orthmann Brice Sinsin laboratoire d’ecologie Appliquée Faculté des Sciences AgronomiquesUniversité d’Abomey-Calavi03 BP 1974 CotonouBénin Laboratory of Biomathematics and Forest Estimations Faculté des Sciences AgronomiquesUniversité d’Abomey-Calavi03 BP 1974 CotonouBénin Institute of Biosciences University of Rostock

Based on 120 stem discs collected during3 months of fieldwork along a 12 km route,the history of fires in the Wari Maro Forest（09 1000 N–02 1000E） over the past century in savanna woodland and dry forest was *** major ecological areas are characterized：one highly burnt zone located between two relative less burnt *** analyzing tree rings,246 fire scars were *** scars were caused by 51 fire years,occurring at a mean interval of 2.23 *** 1890 to1965,only 6 years with fires were recorded from sampled *** 1966,no year has passed without *** fire frequency point scale reached 14 *** was the case of Burkea africana,which has been identified as a species tolerant to fire and could be planted to create a natural *** contrast,Anogeissus leiocarpa is highly sensitive to fire,and in a dry forest ecosystem that burns seasonally,it requires a special conservation *** new concepts are described：the rebarking of trees after fire and Mean Kilometer Fire *** first concept was tested with daniellia oliveri（Rolfe） Hutch ＆ dalz trees,and the second concept was used to evaluate spatial fire *** demonstrate that savanna woodland and dry forest were subject to a degradation process caused by destructive fires related to vegetation cover clearance and illegal logging.

关键词： Fire ecology Tree-rings Savanna woodland dry forest Conservation strategies

doppler Global Velocimeter-development and Validation with Measurements in a Round Free Jet

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2009年第1期18卷 74-84页

作者： X.Ottavy S.Goguey J.Berthiau I.Trébinjac laboratoire de Mécanique des Fluides et d’Acoustique(LMFA)

doppler global velocimetry （dGV） has already been shown to be an interesting technique capable of measuring the three components of velocity in a plane. A 1-component dGV system is currently under development at the LMFA, using a stabilized continuous wave （CW） argon ion laser for ermssion, lne receiver Ieatures only one camera for both signal and reference images and incorporates a dEF1 system to adjust the incident laser light frequency and its transmission coefficient on the iodine cell absorption line. A description of the whole system is presented and a validation with measurements of axial velocities at several positions in a round free jet is proposed.

关键词： laser anemometry doppler shift iodine vapor absorption line filter dEFI system image processing.

Relationship between Tropical Forest distribution and Soils on different Types of Mother Rocks in the Republic of Congo

在线全文

学校读者我要写书评

暂无评论

Open Journal of Forestry 2019年第4期9卷 341-354页

作者： Koubouana Félix Atsoumpari Ngakabi Létycia Adeline Ndzai Saint Fédriche Ifo Suspense Averti laboratoire de Géomatique et d’ecologie Tropicale Appliquée (LGETA) ENSAF Brazzaville Congo laboratoire de Géomatique et d’ecologie Tropicale Appliquée (LGETA) ENS Brazzaville Congo

The factors influencing the distribution of forests and their development are important in order to better understand the bio-functioning of tropicals ecosystems forests. The Republic of the Congo has an important forest area of 23.5 million ha subdivided into three large massifs with different forest units from the north until the south of the country. The present study proposes to highlight the relationship between the edaphic and pedological factors and the distribution of the floristic species of some tropical forests of the Congo. To achieve this aim, a principal component analysis (PCA) was to identify similarities or oppositions between variables and to locate the most correlated variables. Also, the indices of biodiversities were used to assess the biodiversity between forest plot and forest sites. A total of 238 species distributed in 46 families were counted. We noted a CS similarity between Mbomo-Kellé and FMU Mokabi-dzanga of 50%. However, there was considerable variability between the forests of the Impfondo-dongou axis and of the forest of other localities. The main component analysis carried out showed that the distribution of floristic species in the studied forests is determined by the edaphic factors.

关键词： Tropical Forest Congo Biodiversity’s Indices Principal Component Analysis Environmental Factors Similarity Coefficient