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| Registros recuperados: 176 | |
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| Castro,Jonathan P.; Moura,Maurício O.; Moreira-Filho,Orlando; Shibatta,Oscar A.; Santos,Mateus H.; Nogaroto,Viviane; Vicari,Marcelo R.; Almeida,Mara C. de; Artoni,Roberto F.. |
| Two populations of the Astyanax scabripinniscomplex, isolated by a waterfall with over 100 meters depth and inhabiting different altitudes of the same river (1850 m a.s.l. and 662 m a.s.l.) were compared in reproductive data, geometric morphometry, tooth morphology, anal-fin rays counts, and karyotype, in order to test the hypothesis of speciation between the two populations. The results in the geometric morphometry analysis showed differences between the populations. Discriminant function analysis (DFA) and canonical variance analysis revealed sexual dimorphism. Secondary sexual characters, such as hooks in the anal fin rays of the males are absent in the lower altitude population. Both populations had the same macro karyotype structure, except for the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allopatric populations; Cytogenetics; Evolution; Geometric morphometry; Paraíba do Sul River. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000200429 |
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| Li, Zhilong; Chen, Zishen. |
| Research on the laws controlling the shoreline equilibrium shape has been one important topic of studying the evolvement and stabilization of sandy coasts. After a brief review of the progress on the equilibrium shape laws research, five models are introduced in detail. Advantages and disadvantages of these models are then discussed, which leads to the conclusion that the empirical formula integrating with analysis of mechanism should be the future direction of study on the headland-bay equilibrium shape laws. Finally, the importance of the study on the equilibrium shape of headland-bay in China is also discussed. |
| Tipo: Journal Contribution |
Palavras-chave: Evolution. |
| Ano: 2007 |
URL: http://hdl.handle.net/1834/5855 |
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| Schockaert, E.R.. |
| Possible evolutionary trends within Polycystididae have been indicated by Karling (1956) while studying the male genital organs of seyeral turbellarian groups. For the moment his ideas seem the most valuable basis for establishing an intrafamiliar system of Polycystididae, and have hence been applied formally (Schockaert, 1974). However, it can be demonstrated with several examples that the underlying principles prove to be unsatisfactory when one tries to apply Hennig's methodology:-the subfamily Duplacrorhynchinae Schockaert & Karling, 1970, can be recognized as containing the most plesimorph polycystidids; a synapomorph character that would give us an indication of the monophyly of this taxon is lacking;-the homology of some glandular elements (al!... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Evolution; Taxonomy; Polycystididae; Turbellaria [Flatworms]. |
| Ano: 1977 |
URL: http://www.vliz.be/imisdocs/publications/238823.pdf |
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| Wang, Xing jin; Gao, Bing. |
| The paper analyzes the basic situation for the formation of innovative rural organizations with the form of self-organization; revels the features of self-organization, including the four aspects of openness of rural organization, innovation of rural organization is far away from equilibrium, the non-linear response mechanism of rural organization innovation and the random rise and fall of rural organization innovation. The evolution mechanism of rural organization innovation is reveled according to the growth stage, the ideal stage, the decline and the fall stage. The paper probes into the basic restriction mechanism of the self-organization evaluation of rural organization from three aspects, including target recognition, path dependence and knowledge... |
| Tipo: Journal Article |
Palavras-chave: Self-organization; Rural organization innovation; Evolution; Innovation mechanism; China; Agribusiness. |
| Ano: 2011 |
URL: http://purl.umn.edu/113503 |
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| Contijo, Arimar Colen; Godinho, Luiz Antonio de Carvalho; Matos, Ricardo Nogueira de; Almeida, Rinaldo Machado de. |
| The purpose of this article is to put forward a discussion on the evolution and structure of the roles played by the personnel and human resources department in the Beta Enterprise, identifying the reality, indexers and results for that company. The study articulates inter-linked elements for the evaluation of the evolution: the environment and its changes; the organization through updated human resources politicies. After identifying these events for the past 10 years a decriptive/qualitative survey was developed, through the statements by the representatives of the human resources area in the company ( BETA Enterprise ) whose headquarters are in Belo Horizonte, featuring an industrial plant in Vale do Aço, Minas Gerais, for the collection of data on its... |
| Tipo: Journal Article |
Palavras-chave: The role of personnel and human resources; Evolution; Policies and practices.. |
| Ano: 2004 |
URL: http://purl.umn.edu/43678 |
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| Finardi, Corrado; Arfini, Filippo; Turrini, Aida. |
| The present study intends to shed light, both from a descriptive and investigative point of view on the dietary evolution taking place in Europe during last 45 years, using secondary data from FAO FBS, which can cover the entire time span considered and allow for several extrapolation and timeseries analysis, differently than single survey data.. After a clustering of selected european national diets, using specific metrics with respect both to internal and external variety (as measured by appropriate indicators), we intended to check the actual distance that average, national diets have in front of the so called Food Pyramid, which consists in a balance of several food items in adequate proportions and in fact glorifies the healthy virtues of the... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Diets; Evolution; Clustering; Food pyramid; Europe; Trade; GI; Agricultural and Food Policy; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; E37; Q18. |
| Ano: 2010 |
URL: http://purl.umn.edu/116443 |
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| Tisdell, Clement A.. |
| Discusses concepts of competition in economics and ecology and the relevance of evolution to both subjects. It is suggested that although speciation or increasing biodiversity tends to occur in undisturbed ecological systems, the opposite trend may occur in economic systems. Competition based on optimisation plays a significant role in theories of the evolution of species and some theories of the evolution of business or industrial structures. But evolution does not result in optimal selection of species or businesses for the future, and there is scope for doubt about what is being optimised by survivors in the evolutionary process. Ecological or biological theories of intra-specific competition involving scramble and contest competition are outlined and... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Biology; Competition; Evolution; Market development; Optimisation; Environmental Economics and Policy. |
| Ano: 2001 |
URL: http://purl.umn.edu/48384 |
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| Duan, Lu-feng; Zhang, Hong. |
| The general law of regional spatial evolution is researched. In the process of the evolution of four stages, namely the early stage of traditional agriculture and industrialization, the middle stage of industrialization, the later stage of industrialization and post-industrialization, the types of space are homogenized space, polarized space, pole-axis space and integrated space respectively; the choosing of the spatial location is influenced by economy, society and environment, and the spatial structure extends along with three-dimensional space. Based on the fact that China’s urban-rural spatial structure evolution develops rapidly, and the outstanding characteristics of dual structure becomes the main obstacle to urban-rural balanced development, the... |
| Tipo: Journal Article |
Palavras-chave: Space; Urban-rural; Evolution; Integration; Coordination; China; Agribusiness. |
| Ano: 2011 |
URL: http://purl.umn.edu/113932 |
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| Fujun,Xuan; Kailiang,Hu; Tengteng,Zhu; Paul,Racey; Xuzhong,Wang; Yi,Sun. |
| We investigated the reactions of four bat species from four different lineages to UV light: Hipposideros armiger (Hodgson, 1835) and Scotophilus kuhlii Leach, 1821, which use constant frequency (CF) or frequency modulation (FM) echolocation, respectively; and Rousettus leschenaultii (Desmarest, 1820) and Cynopterus sphinx (Vahl, 1797), cave and tree-roosting Old World fruit bats, respectively. Following acclimation and training involving aversive stimuli when exposed to UV light, individuals of S. kuhlii and C. sphinx exposed to such stimuli displayed conditioned reflexes such as body crouching, wing retracting, horizontal crawling, flying and/or vocalization, whereas individuals of H. armiger and R. leschenaultii, in most cue-testing sessions, remained... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chiroptera; Evolution; Fear conditioning; UV vision. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702012000200002 |
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| Requena,Gustavo S.; Nazareth,Taís M.; Schwertner,Cristiano F.; Machado,Glauco. |
| We describe paternal care in two pentatomid bugs, Lopadusa (Lopadusa) augur Stål, 1860 and Edessa nigropunctata Berg, 1884. Field and laboratory observations showed that males remain with their eggs and early hatched nymphs, while females abandon the eggs after oviposition. Guarding males defensive behaviors towards their clutches were similar to those described for guarding females of pentatomids. Since there is no detailed information on the internal phylogeny of Pentatomidae, it is not possible to make a robust inference on whether paternal care in L. augur and E. nigropunctata has arisen independently or not. If the latter, the two new cases of paternal care we describe here represent the fifth event of independent evolution of this rare behavioral... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Edessa nigropunctata; Egg guarding; Evolution; Lopadusa augur. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000600026 |
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| Posso,Sérgio R.; Donatelli,Reginaldo J.. |
| Cuckoos are widely distributed, but are concentrated in the tropics, where they occupy a wide range of habitats. Both terrestrial and arboreal behaviors can be found in this group, but there is no consensus on as to whether these behaviors have arisen more than once. Moreover, the historical distribution of cuckoos is poorly understood. This paper presents a biogeographyc analysis of the early history of the distribution of these birds. The analysis was performed by using the Principle of Parsimony based on primary and secondary "Brooks Parsimony Analysis" (BPA). Despite some exceptions, the primary BPA corroborated events of vicariance (general pattern) in the early distribution of cuckoos and a terrestrial ancestor widespread in the Gondwana. The most... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Parsimony analysis; BPA; Cuculidae; Evolution. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702012000300001 |
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| MATURANA-ROMESIN,HUMBERTO; MPODOZIS,JORGE. |
| In this article we propose that the mechanism that gave rise to the diversity of living systems that we find today, as well as to the biosphere as coherent system of interrelated autonomous living systems, is natural drift. And we also propose that that which we biologists connote with the expression natural selection is a consequence of the history of the constitution of the biosphere through natural drift, and not the mechanism that generates that history. Moreover, we do this by proposing: a) that the history of living systems on earth is the history of the arising, conservation, and diversification of lineages through reproduction, and not of populations; b) that biological reproduction is a systemic process of conservation of a particular... |
| Tipo: Journal article |
Palavras-chave: Evolution; Natural drift; Natural selection; Lineage; Organism; Species. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000200005 |
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| Registros recuperados: 176 | |
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