Algas de las lagunas de alta montaña de Sierra Nevada

Se estudia la composición específica del fitoplancton de 16 lagunas de alta montaNa de Sierra Nevada. Las lagunas estudiadas se encuentran situadas sobre sustrato silíceo y con una altitud comprendida entre los 2.500 y los 3.100 m. Presentan un período libre de hielo que oscila entre 5 y 6 meses, normalmente de juoio a octubre. De los 149 tacones catalogados, 21 pertenecen a las Cyanophyceae, 2 a las Dinophyceae, 8 a las Euglenophyceae, 5 las Chrysophyceae, 51 a las Diatomophyceae, 28 a las Chlorophyceae y 34 a las Zygophyceae; 11 de los cuales no habían sido citados con anterioridad para la ficoflora española.Por su especial interés biogeográfico son de destacar Eunotia pseudopectinalis, E.sudetica, Netrium oblongum var. curvatum y Actinotaenium adelochondrum var. kriegeri, todos ellos de distribución ártico-alpina, mientras que Nostoc kihlmani, Meridion circulare, Cymbella minuta, Pediastrum boryanum, Cosmarium garrolense y Staurastrum hirsutum son los tacones que presentan una más amplia distribución en el conjunto de las lagunas estudiadas.Se propone una combinación nueva: Eunotia pseudopectinalis Hustedt var. vasconiensis (Manguin) Sánchez Castillo.Dann ce travail on étudie la composition spécifique du phytoplancton de 16 lacs de haute montagne de Sierra Nevada. Les lacs étudiés sont-ils situés sur le sol silicieux et á une altitude qui est entre 2.500 et 3.100 m. Elles presentent un période llore du gel qui vane entre 5 et 6 mois, normalement entre join et octubre. Des 149 taxons cités, 21 appartiennent á Cyanophyceae, 2 á Dinophyceae, 8 á Euglenophyceae, 5 á Chrysophyceae, 51 á Diatomophyceae, 28 a Chlorophyceae et 34 á Zygophyceae; 11 d'entre eux n'avaient pas été cités auparavant pour la phycoflore espagnole.Pour leur intérét biogeographique on detaché: Eunotia pseudopectinalis, E. sudetica, Netrium oblongum var. curvatum et Actinotaenium adelochondrum var. kriegeri qui ont distribution artic-alpine; tandis que Nostoc kihlmani, Meridian circulare, Cymbella minuta, Pediastrum boryanum, Cosmarium garrolense et Staurastrum hirsutum sont les spéces ayant une distribution plus ample duns l'ensemble des lacs étudiés.La combinaison nouvelle Eunotia pseudopectinalis Hustedt var. vasconiensis (Manguin) Sánchez Castillo cot proposé

Contribución al conocimiento del género "Chara" en Andalucía

This paper is a chorology and ecology study about six taxa belonging to the genus Chara L. from Andalucía (Spain).Se estudia la distribución de seis táxones del género Chara L. en Andalucía, resaltando los caracteres morfológicos más destacables, así como la ecología observada en cada localidad

The Lattice of Congruences of a Finite Line Frame

Let $\mathbf{F}=\left\langle F,R\right\rangle$ be a finite Kripke frame. A congruence of $\mathbf{F}$ is a bisimulation of $\mathbf{F}$ that is also an equivalence relation on F. The set of all congruences of $\mathbf{F}$ is a lattice under the inclusion ordering. In this article we investigate this lattice in the case that $\mathbf{F}$ is a finite line frame. We give concrete descriptions of the join and meet of two congruences with a nontrivial upper bound. Through these descriptions we show that for every nontrivial congruence $\rho$, the interval $[\mathrm{Id_{F},\rho]}$ embeds into the lattice of divisors of a suitable positive integer. We also prove that any two congruences with a nontrivial upper bound permute.Comment: 31 pages, 11 figures. Expanded intro, conclusions rewritten. New, less geometrical, proofs of Lemma 19 and (former) Lemma 3

Attitudes expressed in online comments about environmental factors in the tourism sector: an exploratory study

The object of this exploratory study is to identify the positive, neutral and negative environment factors that affect users who visit Spanish hotels in order to help the hotel managers decide how to improve the quality of the services provided. To carry out the research a Sentiment Analysis was initially performed, grouping the sample of tweets (n = 14459) according to the feelings shown and then a textual analysis was used to identify the key environment factors in these feelings using the qualitative analysis software Nvivo (QSR International, Melbourne, Australia). The results of the exploratory study present the key environment factors that affect the users experience when visiting hotels in Spain, such as actions that support local traditions and products, the maintenance of rural areas respecting the local environment and nature, or respecting air quality in the areas where hotels have facilities and offer services. The conclusions of the research can help hotels improve their services and the impact on the environment, as well as improving the visitors experience based on the positive, neutral and negative environment factors which the visitors themselves identified

Foreword of the special issue on motivation in Physical Education, sport and physical activity and health

Editorial para Journal of human kinetics, titulado Foreword of the special issue on motivation in Physical Education, sport and physical activity and health.Editorial for Journal of Human Kinetics, entitled Foreword of the special issue on motivation in Physical Education, sport and physical activity and health.peerReviewe

Políticas promovedoras de la tecnificación y su efecto en la productividad acuícola

Continental aquaculture in Peru is gaining exposure as a propitious sector to implement production strategies and achieve technification since its production is based on few species and some regions. This literature review paper aims to present successful technification policies adopted by various developed countries and their impact on aquaculture productivity, compared to Latin American and Peruvian policies. We reviewed scientific articles published in the Scopus, Scielo, Directory of Open Access Journals (DOAJ), ScienceDirect, Latindex, and Google Scholar databases, as well as reports from the National Program for Innovation in Fisheries and Aquaculture (PNIPA) of Peru and the Ministry of Production (PRODUCE), using Mendeley reference manager. A total of 50 articles were selected based on relevance, impact level, and date of publication in the last five years. The countries that have technified their aquaculture processes have managed to position themselves as world benchmarks with high efficiency, productivity, and competitiveness levels. In conclusion, strategies, policies, technological development, and innovation must be promoted to improve and add value to the production chain and thus ensure aquaculture success.La acuicultura en el Perú a nivel continental se proyecta como el sector propicio para desarrollar estrategias productivas y lograr la tecnificación, dado que su producción está basada en pocas especies y en algunas regiones. En ese sentido, el propósito del artículo de revisión bibliográfica es dar a conocer políticas exitosas de la tecnificación aplicadas en diversos países desarrollados y su impacto en la productividad acuícola, relacionado con las políticas de Latinoamérica y del Perú. Se revisaron artículos científicos publicados en las bases de datos Scopus, Scielo, Directory of Open Access Journals (DOAJ), ScienceDirect, Latindex, Google académico, así como reportes del Programa Nacional de Innovación en Pesca y Acuicultura (PNIPA) Perú y Ministerio de la producción (PRODUCE), utilizando el gestor de búsqueda de referencias Mendeley. Se seleccionaron 50 artículos basados en los criterios de relación con el tema, nivel de impacto y año de publicación en los últimos cinco años. Se encontró que los países que han tecnificado sus procesos acuícolas han logrado posicionarse como referentes mundiales con altos niveles de eficiencia, productividad y competitividad. Se concluye que, para asegurar el éxito acuícola, se deben promover estrategias, políticas, el desarrollo tecnológico y la innovación para lograr mejorar y dar valor a la cadena productiva

Interacción de la cohesión en la eficacia percibida, las expectativas de éxito y el rendimiento en equipos de baloncesto

This work examines the relationships among cohesion and self-efficacy, collective efficacy, perceived efficacy by peers and coaches, expectations of success and collective performance. The sample was made up of 61 participants belonging to 6 league basketball teams. Different instruments were used to assess cohesion, perceived efficacy and expectations of success. Performance was measured by their final classifications. The results showed a positive relationship between perceived efficacy and the four factors of cohesion, both as regards social and task aspects. Furthermore, players who perceived a higher level of cohesion were associated with participants who perceived higher expectations of success and performed better