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Cambio climático y distribución potencial del bosque mesófilo de montaña en el Centro de México. Colegio de Postgraduados
Cruz Leyva, Isidro Amhed.
Se modeló la distribución potencial del bosque mesófilo de montaña (BMM) para los estados de Hidalgo, Puebla y Veracruz, México bajo el escenario A2 de cambio climático (2050 y 2080) con los modelos de circulación general (GCM) CCSM3 y ECHAM5. Se utilizaron técnicas de modelado de hábitat (MH), modelado de nicho (MN) y especies arbóreas estructuralmente importantes y restringidas al BMM. Para caracterizar las condiciones ambientales, se integró un Sistema de información Geográfica (SIG) de 5 variables ambientales, 5 variables de distancia euclidiana y 19 variables bioclimáticas. De la Red Mundial de Información sobre Biodiversidad (REMIB) se obtuvieron 872 registros únicos de 12 especies arbóreas del BMM. Con datos de REMIB y del SIG se ajustaron los MN...
Palavras-chave: BMM; A2; GCM; CCSM3; ECHAM5; MH; MN; SIG; REMIB; CUT; ML; HM; NM; GIS; GINB; LUC; LM; Forestal; Doctorado.
Ano: 2014 URL: http://hdl.handle.net/10521/2247
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Woodiness within the Spermacoceae–Knoxieae alliance (Rubiaceae): retention of the basal woody condition in Rubiaceae or recent innovation? Naturalis
Lens, F.; Groeninkx, I.; Smets, E.; Dessein, S..
† Background and Aims The tribe Spermacoceae is essentially a herbaceous Rubiaceae lineage, except for some species that can be described as ‘woody’ herbs, small shrubs to treelets, or lianas. Its sister tribe Knoxieae contains a large number of herbaceous taxa, but the number of woody taxa is higher compared to Spermacoceae. The occurrence of herbaceous and woody species within the same group raises the question whether the woody taxa are derived from herbaceous taxa (i.e. secondary woodiness), or whether woodiness represents the ancestral state (i.e. primary woodiness). Microscopic observations of wood anatomy are combined with an independent molecular phylogeny to answer this question. † Methods Observations of wood anatomy of 21 woody Spermacoceae and...
Tipo: Article / Letter to the editor Palavras-chave: Knoxieae; LM; Primary woodiness; Rubiaceae; Rubioideae; Secondary woodiness; Spermacoceae; Wood anatomy; 42.56.
Ano: 2009 URL: http://www.repository.naturalis.nl/record/428974
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Palynotaxonomy of the genus Gladiopappus (Dicomeae, Asteraceae) with special emphasis on the exine ultrastructure and mesoapertures Naturalis
Pereira Coutinho, A.; Sá da Bandeira, D.; Currais, L.; Soukiazes, E.; Ortiz, S..
The pollen morphology of Gladiopappus vernonioides was studied with transmission (TEM) and scanning (SEM) electron microscopy and with light microscopy (LM). An Anthemoid pattern of exine ultrastructure was found. The pollen morphology of Gladiopappus supports the inclusion of this genus in the tribe Dicomeae and subtribe Dicominae but not in the Mutisieae s.str. The apertural system of G. vernonioides includes a mesoaperture that intersects the foot layer and the upper layer of the endexine, a condition already pointed out for several tribes of Asteroideae (Helenieae, Gnaphaliinae, Heliantheae, Inuleae, Senecioneae) and Carduoideae (Cardueae, Dicomeae). It is suggested that the existence of an intermediate aperture could characterize the apertural system...
Tipo: Article / Letter to the editor Palavras-chave: Dicomeae; Exine; LM; Mutisieae; Pollen; SEM; TEM.
Ano: 2018 URL: http://www.repository.naturalis.nl/record/655821
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The wood anatomy of the polyphyletic Icacinaceae s.l., and their relationships within asterids Naturalis
Lens, F.; Kårehed, J.; Baas, P.; Jansen, S.; Rabaey, D.; Huysmans, S.; Hamann, T.; Smets, E..
Wood samples from 53 species belonging to 41 genera of the Icacinaceae s.l. are investigated using light and scanning electron microscopy. The traditionally circumscribed Icacinaceae fall apart into four segregate families that are clearly nested within asterids, i.e., Icacinaceae s.str. (near or in Garryales), Cardiopteridaceae and Stemonuraceae (both Aquifoliales), and Pennantiaceae (Apiales). From a wood anatomical point of view, these families cannot easily be distinguished from each other. However, some features such as vessel distribution, perforation plate morphology, size and arrangement of vessel pits, fibre wall thickness, and the occurrence of cambial variants can be used to assign various species to one of the four families. The wood structure...
Tipo: Article / Letter to the editor Palavras-chave: Cambial variants; Comparative wood anatomy; Garryales; Icacinaceae; LM; Oncotheca; SEM; 42.58.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/424648
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