18 hasil untuk "S. Robbert Gradstein"
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Artikel Jurnal
Key to hornworts (Anthocerotophyta) of Colombia
A key is presented to seven genera and fifteen species of hornworts recorded from Colombia. Three species found in Ecuador but not yet in Colombia (Dendroceros crispatus, Phaeomegaceros squamuligerus, and Phaeoceros tenuis) are also included in the key.
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Artikel Jurnal
A new key to the genera of liverworts of Colombia
A key is presented to 130 liverwort genera recorded from Colombia. Some genera found in neighboring countries, but not yet in Colombia, are also included in the key
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Artikel Jurnal
A remarkable new species of Cheilolejeunea (Marchantiophyta: Lejeuneaceae) from Colombia.
We describe the new liverwort species Cheilolejeunea schiavoneana M.E.Reiner & Gradst. from submontane rainforest in the Western Cordillera of Colombia. The new species is related to C. adnata (C. sect. Cheilolejeunea) but differs by larger plant, leaf and underleaf size, robust stems, a 5-6 cells…
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Artikel Jurnal
Temperature dependence of liverwort diversification reveals a cool origin and hot hotspots
Abstract The evolutionary history underlying gradients in species richness is still subject to discussions and understanding the past niche evolution might be crucial in estimating the potential of taxa to adapt to changing environmental conditions. In this study we intend to contribute to…
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Artikel Jurnal
The liverworts (Marchantiophyta) of the state of Goiás, Brazil
Ver resumo em pdf no artigo.
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Artikel Jurnal Teks lengkap
An updated checklist of liverworts and hornworts of Malaysia
An updated checklist of the liverworts and hornworts of Malaysia accepts 773 species and 31 infraspecific taxa of liverworts, in 120 genera and 40 families, and 7 species of hornworts (6 genera, 3 families). The largest family is Lejeuneaceae with 312 species in 30 genera, accounting for 40% of the…
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Artikel Jurnal
Cryptogamic epiphytes as indicators of successional changes in megadiverse lowland rain forests of western Amazonia
The Amazonian rain forests of Yasuni National Park, Ecuador (YNP), count among the world's forests regions with highest biodiversity, but are strongly threatened by deforestation. Cryptogams (bryophytes and lichens) are common and characteristic organisms in these forests, are sensitive to…
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Artikel Jurnal
Comunidades de briófitos terrestres relacionados con factores climáticos y topográficos en un páramo del sur de Ecuador
Los páramos presentan altos niveles de diversidad y endemismo de especies y son importantes en la regulación hidrológica. Sin embargo, es uno de los ecosistemas más amenazados debido a actividades agrícolas y ganaderas. Los briófitos son un importante componente en términos de diversidad, bio-masa…
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Artikel Jurnal
New insights into the phylogeny and relationships within the worldwide genus Riccardia (Aneuraceae, Marchantiophytina)
With 280 accepted species, the genus Riccardia S.F.Gray (Aneuraceae) is one of the most speciose genera of simple thalloid liverworts. The current classification of this genus is based on morphological and limited-sampling molecular studies. Very few molecular data are available and a comprehensive…
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An integrative taxonomic study of the genus Lethocolea (Marchantiophyta: Acrobolbaceae)
Background and aims – Lethocolea (Acrobolbaceae) is a small liverwort genus of seven species distributed in temperate regions of the Southern Hemisphere and on tropical mountains. The taxonomic history of the genus has been chaotic, the species were described under many different names and have…
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Artikel Jurnal Teks lengkap
An infrageneric classification of the genus Lejeunea (Marchantiophyta: Lejeuneaceae) using molecular phylogeny and morphology
Background and aims – The genus Lejeunea, with about 375 accepted species, is one of the most species-rich and intricate genera of liverworts. Here, we present the first integrative, worldwide infrageneric classification of Lejeunea based on morphology and molecular-phylogenetic analyses. Material…
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Artikel Jurnal
Liverworts new to Colombia
Based on our ongoing studies of the bryophyte flora of Colombia we report 15 liverwort species new to the country: Archilejeunea nebeliana, Colura calyptrifolia, Dibrachiella auberiana, Fossombronia fernandeziensis, Isopaches bicrenatus, Lejeunea angusta, L. concinnula, L. corynantha, L. galeata…
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Extending the fossil record of Miocene neotropical epiphyte communities
Dominican amber (15–20 Ma) and Mexican amber (15–23 Ma) are valuable sources of fossil epiphytic bryophytes, ferns, and lichens. Both ambers derive from resins of Hymenaea, a genus in the Fabaceae family still occurring in Mexico, Central America, and the Caribbean today. The amber inclusions…
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Spores of Radulaceae (Marchantiophyta) exhibit a level of micromorphological diversity far beyond expectation
Abstract Radulaceae is one of the most isolated lineages of leafy liverworts. This family contains three genera and between 200 and 350 extant species worldwide. Most species belong to the genus Radula, which is subdivided into five subgenera and remains taxonomically challenging. In the framework…
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Artikel Jurnal
Valleys are a potential refuge for the Amazon lowland forest in the face of increased risk of drought
Abstract The Amazon rainforest is home to an incredible variety of plant and animal species and plays a crucial role in regulating the Earth’s climate. Climate change and human activities are putting this important ecosystem at risk. In particular, increasing droughts are making it harder for…
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Volatile Organic Compounds of Bryophytes from Peninsular Malaysia and Their Roles in Bryophytes
Volatile emissions from 22 bryophyte species from Peninsular Malaysia were collected using a dynamic headspace technique and analyzed by gas chromatography–mass spectrometry (GC-MS). Thirty organic compounds (VOCs) from eight different groups were detected in bryophytes from the montane forest in…
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Can Joint Carbon and Biodiversity Management in Tropical Agroforestry Landscapes Be Optimized?
Managing ecosystems for carbon storage may also benefit biodiversity conservation, but such a potential ‘win-win’ scenario has not yet been assessed for tropical agroforestry landscapes. We measured above- and below-ground carbon stocks as well as the species richness of four groups of plants and…
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