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Aproximadamente 8695 registro(s) hasta el momento: (journal)

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Recurso libre

Demography of the lizard Sceloporus grammicus: exploring temporal variation in population dynamics
Zúñiga-Vega, José Jaime - Méndez-de la Cruz, FR - Cuellar, O

Formato:	Article
Enlaces:	We conducted a 5 year demographic study in one population of the viviparous lizard Sceloporus grammicus Wiegmann, 1828 in central México. The population was structured in three size classes (juveniles, small adults, and asymptotic adults) for which we estimated annual…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

Growth response of three globose cacti to radiation and soil moisture: an experimental test of the mechanism behind the nurse effect
Martínez-Berdeja, A - Valverde-Valdés, María Teresa

Formato:	Article
Enlaces:	Cactus seedlings often establish under nurse plants which modify environmental conditions by increasing moisture and decreasing solar radiation, which may cause beneficial and detrimental effects, respectively, on seedling growth. Three soil moisture treatments (5%, 25% and 60%) and two solar…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

Reproductive variation of the lizard Xenosaurus platyceps: comparing two populations of contrasting environments
Rojas-González, RI - Zúñiga-Vega, José Jaime - Lemos-Espinal, JA

Formato:	Article
Enlaces:	We studied litter size, size at birth, and relative litter mass (RLM) in two populations of the crevice-dwelling lizard Xenosaurus platyceps: one located in a low-altitude tropical forest; and the other in a high-altitude temperate oak forest. We found a…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

Does retained-seed priming drive the evolution of serotiny in drylands? An assessment using the cactus Mammillaria hernandezii
Santini, BA - Martorell-Delgado, Carlos

Formato:	Artículo de investigación, Article
Enlaces:	Premise of the study: Serotinous plants retain their seeds for a long time. In deserts, retained seeds undergo hydration-dehydration cycles and thus may become primed. Priming enhances germination and seedling vigor. We test the hypothesis that serotiny evolves because it…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

Partitioning the variation of woody plant ?-diversity in a landscape of secondary tropical dry forests across spatial scales
López-Martínez, JO - Hernández-Stefanoni, JL - Dupuy, JM - Meave del Castillo, Jorge Arturo

Formato:	Article
Enlaces:	What is the relative importance of forest successional age, environmental heterogeneity, landscape structure and spatial structure of sampling sites on ?-diversity of tropical dry forests (TDF)? How do the magnitude of ?-diversity and the relative influence of factors, processes and…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

Demography of two populations of the Mexican mud turtle (Kinosternon integrum) in Central Mexico
Macip-Ríos, R - Brauer-Robleda, P - Zúñiga-Veja, José Jaime - Casas-Andreu, G

Formato:	Article
Enlaces:	Basic demographic information for turtles in tropical and sub-tropical regions is still scarce. As a consequence, prospective management and conservation plans for these long-lived vertebrates lack the necessary quantitative background for successful implementation. In this study, we used capture-mark-recapture techniques…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

Estimating potential reproductive costs in the survival of a xenosaurid lizard
Zúñiga-Vega, José Jaime

Formato:	Article
Enlaces:	Both females and males may suffer from increased mortality risk as a result of the activities and physiological processes associated with reproduction. In this study I estimated sex-specific reproductive costs in the survival rates of a viviparous and territorial lizard…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

The adaptive value of cued dispersal in desert plants: seed retention and release in Mammillaria pectinifera, a small globose cactus
Peters, EM - Martorell-Delgado, Carlos - Ezcurra, E

Formato:	Article
Enlaces:	Serotiny, or delayed seed dispersal, is common in fluctuating environments because it hedges the risks of establishment. Mammillaria pectinifera (Cactaceae) facultatively expels fruits in the year they are produced or retains them to disperse the seed over several years. We…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

Effect of leaf harvesting on the demography of the tropical palm Chamaedorea elegans in South-Eastern Mexico
Valverde-Valdés, María Teresa - Hernández-Apolinar, Mariana - Mendoza-Amaro, S

Formato:	Article
Enlaces:	We report the results of a two-year demographic study in which natural populations of Chamaedorea elegans were subject to harvesting twice a year, four times a year, and no harvesting. Projection matrix analyses indicated that population growth rate (?) was…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

10.

Demographic consequences of chronic anthropogenic disturbance on three populations of the endangered globose cactus Coryphantha werdermannii
Portilla-Alonso, RM - Martorell-Delgado, Carlos

Formato:	Article
Enlaces:	Cacti are thought to be highly vulnerable to chronic anthropogenic disturbance (CAD). To assess its effects, we modeled the dynamics of three populations of the endangered cactus Coryphantha werdermannii exposed to different intensities of disturbance. Because no seedlings germinated and…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

11.

Pattern of root colonization by arbuscular mycorrhizal fungi in Verbesina virgata and their effects on plant growth and leaf physical attributes
Vega-Frutis, R - Sánchez-Gallen, Irene - Guadarrama-Chávez, María Patricia - Sandoval-González, I - Castillo-Argüero, Silvia

Formato:	Article
Enlaces:	Verbesina virgata (Asteraceae) is the stable food of generalist herbivores in xerophytic vegetation of southern Mexico City where nitrogen and phosphorous are limiting soil resources for plant growth and therefore it is likely that arbuscular mycorrhizal fungi play an important…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

12.

Morphological and reproductive variation among populations of the Pacific molly Poecilia butleri
Zúñiga-Vega, José Jaime - Suárez-Rodríguez, M - Espinosa-Pérez, H - Johnson, JB

Formato:	Article
Enlaces:	In viviparous organisms, pregnant females typically experience an increase in body mass and body volume. In this study, the prediction that variation in reproductive traits among populations of viviparous organisms should be related to variation among populations in body shape…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

13.

Survival and early growth of two congeneric cacti that differ in their level of rarity
Miquelajáuregui, Y - Valverde-Valdés, María Teresa

Formato:	Article
Enlaces:	In this paper we analyze the growth and early survival of two congeneric columnar cacti: the rare Neobuxbaumia macrocephala (with low population densities and a narrow distribution range), and the relatively common Neobuxbaumia mezcalaensis (with dense populations and a broader…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

14.

Variation in the population dynamics of the palm Sabal yapa in a landscape shaped by shifting cultivation in the Yucatan Peninsula, Mexico
Pulido, MT - Valverde-Valdés, María Teresa - Caballero, J

Formato:	Article
Enlaces:	To understand the population dynamics of a species, it is necessary to document the way in which its demographic behaviour varies through space and time. Anthropogenic disturbance, such as shifting cultivation, is an important factor causing demographic variation in many…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

15.

Variation in reproductive traits within the lizard genus Xenosaurus
Zamora-Abrego, JG - Zúñiga-Vega, José Jaime - Nieto-Montes de Oca, A

Formato:	Article
Enlaces:	We document variation among 13 populations of distinct species of the lizard genus Xenosaurus in four key reproductive traits: minimum size at maturity, litter size, size at birth, and relative clutch mass (RCM). Despite a common flattened morphology, considerable variation…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

16.

Population dynamics of the shrub Acacia bilimekii in a semi-desert region in Central Mexico
Jiménez-Lobato, V - Valverde-Valdés, María Teresa

Formato:	Article
Enlaces:	Shrubs are important elements of semi-desert vegetation. They provide microhabitats for the establishment of many species under their canopies thus maintaining community structure and diversity. Yet, little is known regarding their population processes and the factors that affect them. In…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

17.

Phosphorus dependence in seedlings of a tropical pioneer tree: the role of arbuscular mycorrhizae
Guadarrama-Chávez, María Patricia - Álvarez-Sánchez, Francisco Javier - Estrada-Torres, A

Formato:	Article
Enlaces:	In general, according to previous studies, pioneer species do not require arbuscular mycorrhizal fungi (AMF) to increase their growth and survival in tropical systems. The aim of this study was to determine the dependence response to AMF of Heliocarpus appendiculatus,…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

18.

Rosette scrub occurrence and fog availability in arid mountains of Mexico
Martorell-Delgado, Carlos - Ezcurra, E

Formato:	Article
Enlaces:	Large succulent leaf rosettes are a characteristic life form in many deserts. In certain areas they become the dominant life form, creating a vegetation type indicated as rosette scrub. The large number of rosette species suggests a close relationship between…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

19.

Coastal sand dune vegetation: an extreme case of species invasion
Castillo-Argüero, Silvia - Moreno-Casasola, P

Formato:	Article
Enlaces:	The coastal sand-dune flora of the Gulf and Caribbean region of Mexico was analyzed to understand differences in floristic composition and richness found along the coast. Each of the 655 species reported was classified according to its ecology and distribution…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

20.

Modeling α- and β-diversity in a tropical forest from remotely sensed and spatial data
Hernández-Stefanoni, JL - Gallardo-Cruz, JA - Meave del Castillo, Jorge Arturo - Rocchini, D - Bello-Pineda, J - López-Martínez, JO

Formato:	Article
Enlaces:	Comprehensive information on species distribution and species composition patterns of plant communities is required for effective conservation and management of biodiversity. Remote sensing offers an inexpensive means of attaining complete spatial coverage for large areas, at regular time intervals, and…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

21.

A comparison of traditional elasticity and variance-standardized perturbation analyses: a case study with the tropical tree species Manilkara zapota (Sapotaceae)
Cruz-Rodríguez, JA - López-Mata, L - Valverde-Valdés, María Teresa

Formato:	Article
Enlaces:	Knowledge of the population dynamics of tropical trees has expanded considerably in the past 20 years. An important observation deriving from these investigations is the confirmation that population behaviour varies both in time and space. A tool recently developed to…
Fecha:	2013-04-05
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

22.

Genetic relationships among some species groups within the genus Lutzomyia (Diptera: Psychodidae)
Torgerson, Dara G. - Lampo, Margarita - Velásquez Zambrano, Yelitza - Woo, Patrick T.K.

Formato:	info:eu-repo/semantics/article
Enlaces:	Molecular data on Lutzomyia are very scarce, despite the fact that this genus includes all the species involved in the transmission of leishmaniasis in America. We examine the genetic relationships among eight morphologic groups within the Lutzomyia genus and two…
Fecha:	2007-11-05
Recurso:	RUA Docencia

Recurso libre

23.

Emma Liggins: George Gissing, the working woman and urban culture, and Susan Hamilton: Frances Power Cobbe and Victorian feminism
Joannou, Maroula

Formato:	Other
Enlaces:	Book review, Reviews of Emma Liggins's book on George Gissing and Susan Hamilton's on Frances Power Cobb.
Fecha:	2013-05-02
Recurso:	Anglia Ruskin University

Recurso libre

24.

Endpiece: agenda for change
Rees, Bronwen A.

Formato:	Article
Enlaces:	Endpiece to special issue of the Interconnections journal on sustainability: 'Perspectives on sustainability'.
Fecha:	2013-11-07
Recurso:	Anglia Ruskin University

Recurso libre

25.

Hepatopancreas alteration of the blue crab Callinectes sapidus by the rhizocephalan barnacle Loxothylacus texanus
Bortolini, JL - Alvarez, F

Formato:	Article
Enlaces:	Descripción completa.
Fecha:	2013-04-11
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

26.

Surviving out in the cold: Antarctic endemic invertebrates and their refugia
Pugh, Philip J.A. - Convey, P.

Formato:	Article
Enlaces:	The definitive version is available at www3.interscience.wiley.com, Aim To identify Antarctic palaeoendemic taxa and their probable glacial refugia from regional groups of endemic species records. Location Antarctica. Methods We compiled a list of Antarctic non-marine invertebrates…
Fecha:	2013-09-16
Recurso:	Anglia Ruskin University

Recurso libre

27.

Women: A Cultural Review special issue: Contemporary Women's Writing

Formato:	Other
Enlaces:	Special issue of the journal Women: a Cultural Review, with critical introduction written and edited by Maroula Joannou, Lucie Armitt and Paulina Palmer.
Fecha:	2013-05-28
Recurso:	Anglia Ruskin University

Recurso libre

28.

Introduction: Contemporary Women's Writing
Joannou, Maroula - Armitt, Lucie - Palmer, Paulina

Formato:	Article
Enlaces:	Critical introduction to the special issue of the journal Women: a Cultural Review, written and edited by Maroula Joannou, Lucie Armitt and Paulina Palmer.
Fecha:	2013-05-30
Recurso:	Anglia Ruskin University

Recurso libre

29.

Creating ethically reflective organisations
O'Shea, Gregory

Formato:	Article
Enlaces:	Much organisational theory has been inspired by ideas of complexity and chaos theory. However, does this really happen in practice? Greg O’Shea argues that, to maintain these principles, we need to be able to dig deeper into what is happening…
Fecha:	2013-02-04
Recurso:	Anglia Ruskin University

Recurso libre

30.

Sharing wisdom from the East: lessons from the King’s Sufficiency Economy in Thailand
Puntasen, Apichai - Rees, Bronwen A.

Formato:	Article
Enlaces:	Bronwen Rees interviews Professor Apichai Puntasen about the attempts to introduce the King’s ideas of Sufficiency Economy into Thailand. The core of this philosophy is developing compassion and co-operation rather than competition.
Fecha:	2013-02-07
Recurso:	Anglia Ruskin University

Recurso libre

31.

Marine Planktonic dinoflagellates of the order Dinophysiales (Dinophyta) from coasts of the tropical Mexican Pacific, including two mew species of the genus Amphisolenia
Hernández Becerril, David U - Gerardo, J - Ceballos Coroa, A - Esqueda Lara, Karina - Tovar Salazar, Myrian A - León Alvarez, Daniel

Formato:	Articulo
Enlaces:	Descripción completa.
Fecha:	2013-04-11
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

32.

Stereotype priming in face recognition: interactions between semantic and visual information in face encoding
Hills, Peter J. - Lewis, Michael B. - Honey, R.C.

Formato:	Article
Enlaces:	The final version of this article published by Elsevier in the Journal of Cognition can be found here: http://www.sciencedirect.com/science/article/pii/S0010027708000772, The accuracy with which previously unfamiliar faces are recognised is increased by the presentation of a stereotype-congruent occupation label (Klatzky, Martin,…
Fecha:	2013-06-25
Recurso:	Anglia Ruskin University

Recurso libre

33.

A new Cryptogonimid (Digenea) from the Mayan cichlid, Cichlasoma urophthalmus (Osteichthyes: Cichlidae), in several localities of the Yucatan Peninsula, Mexico.
Razo-Mendivil, U. - Rosas-Valdez, R. - Perez-Ponce de Leon, G.

Formato:	Artículo
Enlaces:	Oligogonotylus mayae n.sp. is described from the intestine of the Mayan cichlid Cichlasoma urophthalmus (Günther) in Ría Lagartos, Ría Celestún, and Estero Progreso, Yucatán State. This is the second species described for Oligogonotylus Watson, 1976, the other being O.manteri Watson,…
Fecha:	2013-11-20
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

34.

A new species of Heteromyoxyuris (Nematoda: Oxyuridae), parasite of Perognathus flavus (Rodentia: Heteromyidae) from Mexico.
Garcia-Prieto, L. - Falcon-Ordaz, J. - Lira-Guerrero, G.

Formato:	Artículo
Enlaces:	Heteromyoxyuris otomii n. sp., which inhabits the intestinal caecum of Perognathus flavus (Heteromyidae), in Zaragoza, Hidalgo, Mexico, is described. This new species differs from the 2 other congeneric species in the morphology and length of lateral alae in males. Heteromyoxyuris…
Fecha:	2013-11-20
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

35.

Systematics and biogeography of the New World species of Trichadenotecnum Enderlein (Insecta: Psocodea: Psocoptera: Psocidae).
Yoshizawa, K. - Garcia-Aldrete, A. N. - Mockford, E. L.

Formato:	Artículo
Enlaces:	The taxonomy of the New World species of the genus Trichadenotecnum is revised. A total of 44 species, including 29 new species, were treated. These species are classiﬁed into 12 monophyletic species groups, eight of them newly proposed here. Two…
Fecha:	2013-11-20
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

36.

A new genus and species of Philometrid (Nematoda) from the subcutaneous tissue of the crevalle jack, Caranx hippos (Osteichthyes), from the southern Gulf of Mexico.
Moravec, F. - Montoya-Mendoza, J. - Salgado-Maldonado, G.

Formato:	Artículo
Enlaces:	A new genus and species of nematode, Caranginema americanum n. gen., n. sp. (Philometridae), are described from gravid, subgravid, and nongravid female specimens collected from the subcutaneous tissue of the ﬁsh (crevalle jack) Caranx hippos (Carangidae, Perciformes) from the coral…
Fecha:	2013-11-20
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

37.

Compositional and Geochemical Signatures for the Sedimentary Evolution of the Middle Triassic–Lower Jurassic Continental Redbeds from Western-Central Mediterranean Alpine Chains
Critelli, Salvatore - Mongelli, Giovanni - Perri, Francesco - Martín Algarra, Agustín - Martín Martín, Manuel - Perrone, Vincenzo - Dominici, Rocco - Sonnino, Maurizio - Zaghloul, Mohamed Najib

Formato:	info:eu-repo/semantics/article
Enlaces:	Compositional and chemical analyses suggest that Middle Triassic–Lower Liassic continental redbeds (in the internal domains of the Betic, Maghrebian, and Apenninic chains) can be considered a regional lithosome marking the Triassic-Jurassic rift-valley stage of Tethyan rifting, which led to the…
Fecha:	2013-03-22
Recurso:	RUA Docencia

Recurso libre

38.

Description of a new species of Crassicutis Manter, 1936, parasite of Cichlasoma beani Jordan (Osteichthyes: Cichlidae) in Mexico, based on morphology and sequences of the ITS1 and 28S ribosomal RNA genes.
Perez-Ponce de Leon, G. - Razo-Mendivil, U. - Rosas-Valdez, R. - Mejia-Madrid, H.

Formato:	Artículo
Enlaces:	A new species of Crassicutis Manter, 1936 is described from the Sinaloan cichlid Cichlasoma beani (Jordan) (Osteichthyes: Cichlidae) in the upper Rıo Santiago basin. Crassicutis choudhuryi n. sp. differs from most of the other nominal species by having testes located…
Fecha:	2013-11-20
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

39.

Ipomoea tehuantepecensis (Convolvulaceae): a new species from the Isthmus of Tehuantepec, Mexico.
Torres-Colin, L. - Torres-Colin, R. - Ramirez-de Anda, M. P. - McDonald, J. A.

Formato:	Artículo
Enlaces:	A new and narrowly endemic species from the Tehuantepec District of Oaxaca, Ipomoea tehuantepecensis L. Torres Colín, R. Torres Colín, M.P. Ramírez & J.A. McDonald, is described and illustrated. The new species belongs to a primitive assemblage of hairyseeded lianas…
Fecha:	2013-11-20
Recurso:	Facultad de Ciencias - UNAM

Recurso libre

40.

An evolutionary approach to the delineation of functional areas based on travel-to-work flows
Flórez Revuelta, Francisco - Casado Díaz, José Manuel - Martínez Bernabeu, Lucas

Formato:	info:eu-repo/semantics/article
Enlaces:	This paper presents a new approach to the delineation of local labor markets based on evolutionary computation. The aim of the exercise is the division of a given territory into functional regions based on travel-to-work flows. Such regions are defined…
Fecha:	2013-04-23
Recurso:	RUA Docencia

Recurso libre

41.

Editorial
Sidorov,Grigori

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-06-01
Recurso:	SCIELO

Recurso libre

42.

Editorial
Sierra,Gerardo

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-12-01
Recurso:	SCIELO

Recurso libre

43.

Foreward
Nault, D. M.

Formato:	info:eu-repo/semantics/article, info:eu-repo/semantics/publishedVersion,
Enlaces:	Descripción completa.
Fecha:	2008-03-03
Recurso:	Asia Journal of Global Studies

Recurso libre

44.

Foreward
Nault, D. M.

Formato:	info:eu-repo/semantics/article, info:eu-repo/semantics/publishedVersion,
Enlaces:	Descripción completa.
Fecha:	2008-05-29
Recurso:	Asia Journal of Global Studies

Recurso libre

45.

Wired to the World, Chained to the Home: Telework in Daily Life
Bryant, Susan; University of Windsor

Formato:	info:eu-repo/semantics/article, book-review, info:eu-repo/semantics/publishedVersion
Enlaces:	Descripción completa.
Fecha:	2008-02-28
Recurso:	Canadian Journal of Comumunication

Recurso libre

46.

Always Already New: Media, History and the Data of Culture
Mauricio-Cardilli, Riccardo; Concordia University

Formato:	info:eu-repo/semantics/article, book-review, info:eu-repo/semantics/publishedVersion
Enlaces:	Descripción completa.
Fecha:	2008-02-28
Recurso:	Canadian Journal of Comumunication

Recurso libre

47.

An Alternative Internet: Radical Media, Politics and Creativity
Wilson, Kevin G.; Tele-université, UQAM

Formato:	info:eu-repo/semantics/article, book-review, info:eu-repo/semantics/publishedVersion
Enlaces:	Descripción completa.
Fecha:	2008-02-28
Recurso:	Canadian Journal of Comumunication

Recurso libre

48.

Knowledge Workers of the World! Unite?
Mosco, Vincent; Queen's University

Formato:	info:eu-repo/semantics/article, review-article, info:eu-repo/semantics/publishedVersion
Enlaces:	Descripción completa.
Fecha:	2008-02-28
Recurso:	Canadian Journal of Comumunication

Recurso libre

49.

The Long Tail: Why the Future of Business Is Selling Less of More
Armstrong, Robert

Formato:	info:eu-repo/semantics/article, book-review, info:eu-repo/semantics/publishedVersion
Enlaces:	Descripción completa.
Fecha:	2008-02-28
Recurso:	Canadian Journal of Comumunication

Recurso libre

50.

Communication Technology
Light, Evan; Université du Québec à Montréal

Formato:	info:eu-repo/semantics/article, book-review, info:eu-repo/semantics/publishedVersion
Enlaces:	Descripción completa.
Fecha:	2008-02-28
Recurso:	Canadian Journal of Comumunication