scholarly journals Las comunidades vegetales del bosque de coníferas altimontano en el macizo del Tancítaro (Michoacán, México)

2020 ◽  
Author(s):  
Consuelo Medina García ◽  
Joaquin Gimenez de Azcarate ◽  
Alejandro Velázquez Montes
Keyword(s):  
Service Providers ◽  
Distribution Patterns ◽  
Environmental Services ◽  
Multivariate Techniques ◽  
Plant Associations ◽  
Environmental Variations ◽  
Field Information ◽  
Grassland Types

Antecedentes y Objetivos: El límite superior del bosque es un ecosistema que alberga comunidades herbáceas y forestales con singular presencia de endemismos y con una función relevante en la captación, recarga y transporte de agua, lo que los define como nodos de provisión de bienes y servicios ambientales. Lo anterior es de particular significado en las montañas intertropicales por ser las que resguardan un banco de germoplasma oriundo significativamente elevado. Ese es el caso del Pico del Tancítaro y volcanes circundantes, región de estudio comprendida entre 2600 y 3800 m de altitud en Michoacán, México. Este trabajo tuvo como objetivo central definir y caracterizar la diversidad florística y fitocenótica, así como las pautas de distribución de las asociaciones vegetales a lo largo del gradiente altitudinal.Métodos: Se realizaron 35 inventarios siguiendo la metodología fitosociológica; en ellos se registraron las especies, su cobertura y los atributos físico-geográficos del sitio muestreado. La información de campo fue corroborada en gabinete; para asegurar los aspectos de identificación florística se utilizó preferentemente la “Flora del Bajío y de regiones adyacentes”. Los datos fueron analizados utilizando técnicas de agrupamiento multivariadas para poder definir las asociaciones vegetales.Resultados clave: Los 35 inventarios se consideraron como base para armar las tablas de vegetación que soportan las siguientes asociaciones vegetales: Gaultherio myrsinoidis-Pinetum hartwegii, Polysticho speciosissimae-Abietetum religiosae y Sibthorpio repentis-Abietetum religiosae; así como otras de rango menor. Para cada asociación se abordaron cuestiones de estructura, composición, ecología, distribución y relación con los pisos bioclimáticos y con otras asociaciones próximas.Conclusiones: Las combinaciones florísticas propias de las asociaciones reflejan las variaciones ambientales que se suceden en el gradiente altitudinal, incluyendo las causadas por perturbación natural y/o antrópica. Dichas asociaciones permiten tipificar la heterogeneidad fitocenótica del bosque estudiado y su papel como proveedoras de servicios ambientales y de biodiversidad.Abstract:Background and Aims: The timberline occurs as an ecosystem harboring unique forest and grassland types comprising outstanding endemic species. These vegetation types, furthermore, are the centers of capturing, recharging and transporting water so that these are regarded as provider´s nodes of environmental services. This is even more significant in intertropical mountains since these harbor large genetic reservoirs. This is the case of the Pico del Tancítaro and surrounding volcanoes, a region between 2600 and 3800 m elevation, in Michoacán, Mexico. The present study aimed to define and characterize the floristic and phytocenotic diversity, as well as recognize distribution patterns of the plant associations along the elevational gradient.Methods: Thirty five inventories were carried out following the phytosociological approach. At each inventory, a list of species, their coverage, and physical and geographical attributes of the site were compiled. Field information was later verified in the laboratory to ensure species identification; “Flora del Bajío y regiones adyacentes” was preferably consulted. Data were further analyzed via multivariate techniques in order to define plant associations.Key results: The 35 inventories were considered as a basis to assemble the vegetation tables that support three plant associations: Gaultherio myrsinoidis-Pinetum hartwegii, Polysticho speciosissimae-Abietetum religiosae and Sibthorpio repentis-Abietetum religiosae; as well as other units of lower rank. For each one, issues, such as structure, composition, ecology, distribution and relationship with bioclimatic belts and other nearby associations were addressed.Conclusions: The floristic combinations of the associations reflect environmental variations that occur along the altitudinal gradient, including those caused by natural and/or anthropic disturbance. These associations permit a clear classification of the phytocenotic heterogeneity in the forest studied, and confirm its role of environmental service providers and biodiversity.

scholarly journals The role of interannual environmental variations in the geographic range of spawning and feeding concentrations of redfish Sebastes mentella in the Irminger Sea

2005 ◽  
Vol 62 (7) ◽  
pp. 1501-1510 ◽  
Author(s):  
Andrey P. Pedchenko
Keyword(s):  
Water Temperature ◽  
Central Area ◽  
Distribution Patterns ◽  
Atlantic Water ◽  
Western Slope ◽  
The North ◽  
Irminger Sea ◽  
Environmental Variations ◽  
Sebastes Mentella

Abstract The Irminger Sea is occupied by the most abundant population of the redfish, Sebastes mentella, in the North Atlantic. Results of Russian and international surveys of redfish in the Irminger Sea between 1982 and 2003 are summarized here. Interannual variations in redfish spatial distribution and oceanographic conditions are also analysed. Distribution patterns of spawning and feeding concentrations of redfish are established, and the role of oceanographic factors in the formation of concentrations and in the migrations of redfish are shown. The habitat of the mature redfish population in pelagic waters is confined within the Sub-polar cyclonic Gyre. Redfish spawning grounds extend along the western slope of the Reykjanes Ridge in the areas of intensive rise of intermediate waters. Seasonal variation in water temperature above the ridge slopes is one of the factors causing feeding redfish to migrate westwards, to the central area of the Sub-polar Gyre. Atlantic Water advection, intensified by the Irminger Sea, and water temperature increase in the upper 200-m layer in the second half of the 1990s produced a considerable shift of commercial concentrations of feeding redfish from their usual grounds westwards, to the NAFO Regulatory area.

scholarly journals Disentangling earthworm taxonomic stumbling blocks using molecular markers

2021 ◽  
Vol 13 (11) ◽  
pp. 19566-19579
Author(s):  
Azhar Rashid Lone ◽  
Samrendra Singh Thakur ◽  
Nalini Tiwari ◽  
Olusola B. Sokefun ◽  
Shweta Yadav
Keyword(s):  
Population Genetics ◽  
Molecular Markers ◽  
Native Species ◽  
Distribution Patterns ◽  
Negative Consequences ◽  
Lineage Sorting ◽  
Earthworm Species ◽  
Historical Processes

Taxonomic classification of earthworms based on anatomical features has created several challenges for systematics and population genetics. This study examines the application of molecular markers, in particular mitochondrial cytochrome oxidase (COI), to facilitate discrimination of closely related earthworm species. Molecular markers have also provided insights into population genetics by aiding assessment of genetic diversity, lineage sorting, and genealogical distributions of populations for several species. Phylogeography—a study that evaluates the geographical distribution of these genealogical lineages and the role of historical processes in shaping their distribution—has also provided insights into ecology and biodiversity. Such studies are also essential to understand the distribution patterns of invasive earthworm species that have been introduced in non-native ecosystems globally. The negative consequences of these invasions on native species include competition for food resources and altered ecosystems. We anticipate that molecular markers such as COI and DNA barcoding offer potential solutions to disentangling taxonomic impediments in earthworms and advancing their systematics and population genetics. 

Raiders Activity on the Market for Corporate Control as a Product of Coercive Entrepreneurship Evolution

2007 ◽  
pp. 80-92
Author(s):  
A. Kireev
Keyword(s):  
Corporate Control ◽  
Role Of Government ◽  
Market For Corporate Control ◽  
Basic Characteristics

The paper studies the problem of raiders activity on the market for corporate control. This activity is considered as a product of coercive entrepreneurship evolution. Their similarities and sharp distinctions are shown. The article presents the classification of raiders activity, discribes its basic characteristics and tendencies, defines the role of government in the process of its transformation.

ASPECTS IN BUILDING A COMPANY WEB-SITE AND ITS ROLE FOR THE DEVELOPMENT OF BUSINESS

2018 ◽  
pp. 117-124
Author(s):  
Petar Halachev ◽  
Victoria Radeva ◽  
Albena Nikiforova ◽  
Miglena Veneva
Keyword(s):  
Life Cycle ◽  
Web Site ◽  
The Internet ◽  
A Company ◽  
The Web ◽  
Design Construction ◽  
Made In ◽  
Site Types

This report is dedicated to the role of the web site as an important tool for presenting business on the Internet. Classification of site types has been made in terms of their application in the business and the types of structures in their construction. The Models of the Life Cycle for designing business websites are analyzed and are outlined their strengths and weaknesses. The stages in the design, construction, commissioning, and maintenance of a business website are distinguished and the activities and requirements of each stage are specified.

Risk and Protective Factors in the Life of Youth in Relation to Resilience

2018 ◽  
Vol 52 (1) ◽  
pp. 50-59
Author(s):  
Silvia Barnová ◽  
Viola Tamášová
Keyword(s):  
Social Support ◽  
Protective Factors ◽  
School Psychologists ◽  
Social Environment ◽  
Social Services ◽  
Service Providers ◽  
Vital Role ◽  
Great Role ◽  
Health Service Providers

Abstract Introduction: A certain degree of stress is present in everyone’s life and young people are not an exception. Most of them show a certain degree of resilience and can cope with stressful situations without any difficulties, however there is a group of youth who live in toxic environments and need help. If there is a risk of failure due to the intensity of stressors; external formal and informal support have a great role to play as they have the potential to prevent negative developmental outcomes. Purpose: The authors’ intention was to make a review of available literature on the current issues of resilience research with a focus on the importance of protective factors in young people’s lives – especially when they are exposed to adversity. An emphasis is placed on the vital role of social support to individuals provided by schools as well as social services. Methods: In the presented literature review, multiple formal search methods including hand searching of key journals; electronic searching of journal databases and subject specific websites; reference scanning; and citation tracking were used. Conclusion: Individuals commonly demonstrate some level of resilience, yet most of them are able to deal with stressful situations without any harm. On the other hand, if the adversity is too high, the presence of social support provided by their social environment is important. In this context, good relationships in general and sufficient external protective factors provided by their social environment (schools, school psychologists, institutional social and health service providers) are important.

Information-seeking to Support Personal and Community Wellbeing: Report of a study of New Zealand Men Using Focus Groups

2016 ◽  
Author(s):  
Peta Wellstead
Keyword(s):  
New Zealand ◽  
Focus Groups ◽  
Support Services ◽  
Information Seeking ◽  
Service Providers ◽  
Structural Constraints ◽  
Health And Wellbeing ◽  
Study Results ◽  
Groupes De Discussion

This paper reports part of an ongoing study exploring the information behaviour of New Zealand men during periods of diminished health and wellbeing. Focus groups were used for this iteration of the study. Results indicate that New Zealand men face both personal and structural constraints to their information-seeking during periods when their health and wellbeing may be compromised. This study highlights that service providers need to develop more effective information delivery mechanisms and support services for men. These services need to be appealing to men and reflect men’s information seeking preferences. The role of LIS professionals in supporting this endeavour is discussed. Cet article présente une étude en cours explorant le comportement informationnel d’ hommes néo-zélandais durant des périodes où leur état de santé et de bien-être est amoindri. Des groupes de discussion ont été utilisés pour cette itération de l'étude. Les résultats indiquent que les hommes en Nouvelle-Zélande font face à des contraintes à la fois  personnelles et structurelles dans leur recherche d'information pendant les périodes où leur santé et leur bien-être peuvent être affaiblis. Cette étude met en évidence le besoin pour les fournisseurs de services de développer des mécanismes de diffusion de l'information plus efficaces et des services de soutien pour les hommes. Ces services doivent être attrayants et refléter les préférences des hommes dans leurs recherches d’information. Le rôle des professionnels de l'information dans le soutien à cette entreprise est discuté.

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