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DIALNET OAI Articles (538,205 recursos)
Dialnet (Difusión de Alertas en la Red) es una plataforma de recursos y servicios documentales, cuyo objetivo fundamental se centra en mejorar la visibilidad y el acceso a la literatura científica hispana a través de Internet.

Ciencias biológicas

Mostrando recursos 1 - 20 de 20,632

1. Towards a revision of Pseudobombax Dugand (Malvaceae- Bombacoideae): typification of names published by E. Hassler and R. Chodat in the related genus Bombax L. - Carvalho-Sobrinho, Jefferson Guedes de; Ramella, Lorenzo; Queiroz, Luciano Paganucci de; Dorr, Laurence J.
To facilitate an ongoing taxonomic revision of Pseudobombax Dugand as part of studies on the systematics of Neotropical Bombacoideae (Malvaceae), we clarify the typification of 16 names in Bombacoideae that were published by Emil Hassler and Robert Chodat based mostly on specimens collected by Hassler in Paraguay and collected by Robert Fries and Gustaf Malme in Argentina and Brazil. We designate 4 lectotypes for the following names: Bombax elegans R. E. Fr., Bombax longi florum var. emarginatum Hassl., Bombax marginatum subsp. meridionale Hassl., Bombax marginatum var. praecox Hassl. An epitype is designated for Bombax elegans R. E. Fr. In addition, we narrow down André Robyns� lectotypification of Bombax marginatum f. arboreum Chodat...

2. Actualización de la nomenclatura de los géneros Leptocoryphium Nees y Panicum L. (Gramineae-Paniceae) - Zuloaga, F. O.; Morrone, Osvaldo
The accepted names of Leptocoryphium Nees and Panicum L., published in 1994 in the fascicle Flora del Paraguay 23, are revised and updated following the most recent taxonomic revisions.

3. Three new grass records for Madagascar - Vorontsova,, María S.; Nanjarisoa,, Olinirina Prisca; Besnard, Guillaume
Madagascar�s fragile ecosystems are vulnerable to invasive plants but accounting for these in a poorly known and undercollected group is challenging due to an insufficient knowledge base. We record three species of grasses (Poaceae) new to Madagascar. Ehrharta stipoides Labill. is a potentially dangerous introduction due to its invasiveness in frequently burned ecosystems. Enteropogon prieurii (Kunth) Clayton is not recorded as invasive but is frequently misidentified due to its similarity to Chloris virgata Sw. The new record of Vulpia myuros (L.) C. C. Gmel. is from a collection made 50 years ago.

4. A new name in Ruellia L. (Acanthaceae) for Madagascar - Callmander, Martin W.; Tripp, Erin A.; Phillipson, Peter B.
endemic Malagasy Eusiphon Benoist is nested within Ruellia L. (Acanthaceae). The authors here propose a new name to replace an illegitimate later homonym for Eusiphon longissimum Benoist: Ruellia quartziticola Callm., E. Tripp & Phillipson. This striking species is rare in the wild and endemic to the quartzite veins of the Highlands of Madagascar. Following IUCN Red List Categories and Criteria, Ruellia quartziticola is considered to be �Critically Endangered�.

5. Aloe gautieri J.-P. Castillon & Nusb. (Xanthorrhoeaceae), a new species from the northeastern coast of Madagascar - Castillón,, Jean-Philippe; Nusbaumer, Louis
Aloe gautieri J.-P. Castillon & Nusb. (Xanthorrhoeaceae, Asphodeloideae), a new species from the northeastern coast of Madagascar is described and illustrated. The new species is morphologically closely related to Aloe fragilis Lavranos & Röösli but differs in having paler flowers, more elongated racemes, ungrouped cauline leaves forming no compact rosette. The distribution, ecology and conservation status of the new species are presented along with a line drawing and colour pictures.

6. A synoptic revision of the Malagasy endemic genus Socratina Balle (Loranthaceae) - Callmander, Martin W.; Luino, Iacopo; Da-Giau, Simona; Rakotovao, Charles; Gautier, Laurent
The hemiparasitic endemic genus Socratina Balle (Loranthaceae) is revised for Madagascar. Three species are recognized, including a new one, Socratina phillipsoniana Callm. & Luino. The vegetative and floral morphology of the new species is distinctive; in particular the conspicuous longitudinal villous fringe of long dendritic trichomes on the outer surface of its corolla along each suture of the lobes that contrasts with the shorter floccose indument that covers the rest of the outer corolla surface. All three known species are provided with preliminary risk assessments based on the IUCN Red List Categories and Criteria. A key to the genus is presented and a discussion of the morphological affinities of each species...

7. Taxonomic revision of the genus Bombycilaena (DC.) Smoljan. (Asteraceae) - Andrés Sánchez, Santiago; Martínez Ortega, María Montserrat; Rico Hernández, Enrique
La première étude taxonomique complète du genre Bombycilaena (DC.) Smoljan., basée sur la révision de plus de 2000 échantillons conservées dans 28 herbiers, est présentée ici. Une description détaillée du genre et une clé d�identification des deux espèces qui y sont incluses sont données, de même que leur description et les données relatives à leur habitat, phénologie et distribution géographique. Le problème lié à la typification de Bombycilaena erecta (L.) Smoljan. est résolu et un néotype est désigné pour le nom Bombycilaena discolor (Pers.) M. Laínz.

8. Taxonomy of Anisotes Nees (Acanthaceae: Justicieae) in the Comoros Archipelago and a preliminary list of Acanthaceae in the Islands - Daniel, Thomas F.
A new species and a new combination in Anisotes Nees are proposed for the acanthaceous flora of the Comoros Archipelago. The new species, Anisotes mayottensis T. F. Daniel, is known only from Mayotte, and can be distinguished from its Comoran congener by its unequally five-lobed (4+1) or equally four-lobed calyx; longer corolla, stamens, and thecae; and fouraperturate pollen. Anisotes comorensis (Lindau) T. F. Daniel, based on Himantochilus comorensis Lindau, is proposed for a species endemic to Grande Comore. A lectotype is designated for Himantochilus comorensis. Both species are described, mapped, and distinguished by a key; Anisotes mayottensis is also illustrated. All Acanthaceae known from the archipelago are listed in a table.

9. Floristic analyses of the Corsican flora: distribution in ecological compartments - Schlüssel, André; Jeanmonod, Daniel; Gamisans, Jacques
This article analyzes partial data published in the �Flora Corsica� in order to characterize the Corsican vascular flora. These analyses focus on different aspects of the flora such as species richness, taxonomic distribution, abundance and life-forms at different vegetation belts, habitats and substrates. The results are compared with other geographic regions, particularly from the European Mediterranean and adjacent areas. The decrease of species richness with an increase of altitude as well as the sharp decrease of Fabaceae has been confirmed. Regarding the biological spectrum, the decrease of the therophytes with an increase of altitude is obvious and compensated by the increase of the hemicryptophytes. On Corsica several peculiarities have been highlighted in...

10. Pabstiella pseudotrifida L. Kollmann & D. R. Couto (Orchidaceae), a new species from Espírito Santo, Brazil - Kollmann, Ludovic Jean-Charles; Couto, Dayvid Rodrigues
Pabstiella pseudotrifida L. Kollmann & D. R. Couto (Orchidaceae), a new species from the State of Espírito Santo, Brazil, is described, illustrated, and compared with Pabstiella trifida (Lindl.) Luer, a morphologically similar species.

11. Primulina dongguanica F. Wen, Y. G. Wei & R. Q. Luo (Gesneriaceae), a new species from South China - Fang, Wen; Wei, Yi-Gang
A new species, Primulina dongguanica F. Wen, Y. G. Wei & R. Q. Luo (Gesneriaceae) is described and illustrated from Dongguan city, Guangdong province, S China. The species grows in crevices of granite within subtropical evergreen broad-leaved forests or shrubby vegetation in the Yinpingzui nature reserve. Primulina dongguanica differs from other species in the genus occurring in Guangdong province, China. Despite sharing some morphologically characters with Primulina eburnea (Hance) Y. Z. Wang, Primulina dryas (Dunn) Mich. Möller & A. Weber, Primulina napoen- sis (Z. Y. Li) Mich. Möller & A. Weber and Primulina spec. nov., several features allow its recognition. It...

12. Tipificación de Inula montana L. (Asteraceae) - Ferrer-Gallego, Pedro Pablo; Laguna Lumbreras, Emilio; Roselló, Roberto; Gómez, José; Peris, Juan B.
The name Inula montana L. (Asteraceae) is lecto- and epitypified. The designated lectotype corresponds to an icon from Robert Morison published in 1699 and the epitype to a plant specimen collected by Morison and conserved at OXF (Morisonian Herbarium).

13. Improving the reviewing process in Ecology and Evolutionary Biology - Grossman, Gary D.
Improving the reviewing process in Ecology and Evolutionary Biology.� I discuss current issues in reviewing and editorial practices in ecology and evolutionary biology and suggest possible solutions for current problems. The reviewing crisis is unlikely to change unless steps are taken by journals to provide greater inclusiveness and incentives to reviewers. In addition, both journals and institutions should reduce their emphasis on publication numbers (least publishable units) and impact factors and focus instead on article synthesis and quality which will require longer publications. Academic and research institutions should consider reviewing manuscripts and editorial positions an important part of a researcher�s professional activities and reward them accordingly....

14. Grasses of Washington, D.C. - Ibrahim,, kamal m.; Peterson, Paul M.
Ibrahim, Kamal M., and Paul M. Peterson. Grasses of Washington, D.C. Smithsonian Contributions to Botany, number 99, viii + 128 pages, 190 figures, 2014.�A vegetative key, descriptions, and illustrations for the identification of 182 native and naturalized grasses that occur in Washington, D.C., are presented. In addition, we provide a glossary of terms and indexes to scientific and common names. The key is based on vegetative characters to allow identification of specimens that primarily do not have flowering structures (inflorescences and spikelets).

15. Is the �n = 30 rule of thumb� of ecological field studies reliable?: a call for greater attention to the variability in our data - Martínez Abraín, Alejandro
Is the 'n = 30 rule of thumb' of ecological field studies reliable? A call for greater attention to the variability in our data.� A common practice of experimental design in field ecology, which relies on the Central Limit Theorem, is the use of the 'n = 30 rule of thumb'. I show here that papers published in Animal Biodiversity and Conservation during the period 2010�2013 adjust to this rule. Samples collected around this relatively small size have the advantage of coupling statistically�significant results with large effect sizes, which is positive because field researchers are commonly interested in large ecological effects. However, the power to...

16. Chinchilla lanigera (Molina 1782) and C. chinchilla (Lichtenstein 1830): review of their distribution and new findings - Valladares Faúndez, Pablo; Zuleta, Carlos; Spotorno Oyarzún, Ángel
Chinchilla lanigera (Molina 1782) and C. chinchilla (Lichtenstein 1830): review of their distribution and new findings.� Millions of Chinchilla chinchilla and C. lanigera were killed during the early twentieth century and they were nearly hunted to extinction. In order to establish the current range of distribution of these two wild species and to localize possible new colonies, we used the available scientific literature, technical reports, information from residents, and live trapping methods. Both species are 'critically endangered' since their current distribution is highly fragmented and all recognized colonies are small and isolated. We report a small new wild colony of C. lanigera in the Atacama region,...

17. Invertebrates outcompete vertebrate facultative scavengers in simulated lynx kills in the Bavarian Forest National Park, Germany - Ray, Rena Rebeca; Seibold, Heidi; Heurich, Marco
Invertebrates outcompete vertebrate facultative scavengers in simulated lynx kills in the Bavarian Forest National Park, Germany.� Understanding the role of scavengers in ecosystems is important for species conservation and wildlife management. We used road�killed animals, 15 in summer 2003 (June�August) and nine in winter 2003/2004 (from November to January), to test the following hypotheses: (1) vertebrate scavengers such as raven (Corvus corax), red fox (Vulpes vulpes) and wild boar (Sus scrofa) consume a higher proportion of the carcasses than in.. vertebrates; (2) the consumption rate is higher in winter than in summer due to the scarcity of other food resources; and (3) vertebrate scavengers are effective...

18. Habitat use pattern and conservation status of smooth�coated otters Lutrogale perspicillata in the Upper Ganges Basin, India - Khan, M. S.; Dimri, Nand Kishor; Nawab, Asghar; Ilyas, Orus; Gautam, Parikshit
Habitat use pattern and conservation status of smooth�coated otters Lutrogale perspicillata in the Upper Ganges Basin, India.� Smooth�coated otters inhabit several major river systems in southern Asia, and their environmental requirements link them to food and water security issues as the region is so densely populated by humans. The lack of baseline data on their distribution and ecology is another major constraint that the species is facing in India. The present study was stimulated by the rapid decline in the otter�s population in the country and focuses on estimating the conservation status, habitat use pattern, and associated threats in the upper Ganges River Basin (N India)....

19. Evolution from the Galapagos: Two centuries after Darwin. - Chica, Carmen

20. Tetracycline-resistance encoding plasmids from Paenibacillus larvae, the causal agent of American foulbrood disease,of American foulbrood disease. - Alippi, Adriana M.; León, Ignacio E.; López, Ana C.

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