874 research outputs found
A key to the Colombian species of Holostipous Lejeuneaceae (Hepaticae) A key to the Colombian species of Holostipous Lejeuneaceae (Hepaticae)
No full textA synopsis and key emphasizing vegetative characters are provided for 72 species (in 34 genera) of Lejeuneaceae with undivided underleaves, recorded from Colombia and neighbouring areas. A brief statement on the altitudinal distribution and on the ecology of the species in Colombia is also provided. The checklist of the Hepaticae of Colombia (Gradstein & Hekking 1979) is updated; 10 species are added to the Colombian flora and 36 species names recorded from Colombia have fallen into synonymy. Se provee la sinopsis y la clave, con énfasis en carácteres vegetativos, para 72 especies (en 34 géneros) de Lejeuneaceae con anfigastros enteros para Colombia y regiones aledañas. También se suministra una breve información sobre la ecología y distribución altitudinal de las especies en Colombia. A la lista de Hepáticas de Colombia (Gradstein y Hekking 1979) se agregan 10 especies de la flora de Colombia, así mismo, 36 nombres de especies colombianas pasan a ser sinónimas.</p
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No full textThe liverwort genus Cyrtolejeunea A. Evans is reduced to synonymy under Cheilolejeunea (Spruce) Schiffn. because of the existence of a series of intermediate species, including Cheilolejeunea insecta Grolle & Gradst. sp. nov. from Bolivia and Brazil and Cheilolejeunea chenii R.L. Zhu & M.L. So from eastern China. The new combinations, Cheilolejeunea holostipa (Spruce) Grolle & R.L. Zhu comb. nov. and C. suzannensis (Grolle) Grolle & R.L. Zhu comb. nov., are proposed
Santa María, líquenes, hepáticas y musgos: guía de campo
No full textilustraciones, fotografías, mapasEn este libro, Santa María , Líquenes, Hepáticas y Musgos, se recogen las experiencias de lo que pudiéramos llamar tres generaciones de estudiosos de la briología de Colombia, el investigador de mayor trayectoria, el profesor J. Aguirre-C., el doctor Jaime Uribe, discípulo de J. Aguirre-C. y de S. R. Gradstein, especialista en el estudio de las hepáticas de Colombia, con contribuciones de reconocida calidad, que también son textos muy aceptados a nivel internacional como la lista de las hepáticas de Colombia y varias flórulas. (texto tomado de la fuente)Presentación -- Agradecimientos -- Introducción -- Sobre Santa María -- Sobre los Líquenes -- Sobre las Hepáticas -- Sobre los Musgos -- Cómo está organizada esta guía -- Líquenes -- Hepáticas -- Musgos -- Glosario ilustrado de Líquenes -- Glosario ilustrado de Hepáticas -- Glosario ilustrado de Musgos -- Índice de géneros de Líquenes -- Índice de géneros de Hepáticas -- Índice de géneros de Musgos -- BibliografíaPrimera edició
TaxLink, a program for computer‐assisted documentation of different circumscriptions of biological taxa
No full textTaxonomic interpretations of species or other taxa may vary considerably among authors. A database program called TaxLink has been developed, which allows for a detailed visualisation of comparisons between different taxonomic concepts. The basic entities of TaxLink are "taxonyms" (= potential taxa. Berendsohn, 1995). TaxLink may store taxonyms with their references, synonyms, relationships between taxonyms, and nomenclatural status of names. Information can be vizualised on screen, printed, and retrieved as textdocument in Microsoft Word format
Effect and Improvement Areas for Port State Control Inspections to Decrease the Probability of Casualty
No full textThis report is the fourth part of a PhD project called "The Econometrics of Maritime Safety – Recommendations to Enhance Safety at Sea" and is based on 183,000 port state control inspections and 11,700 casualties from various data sources. Its overall objective is to provide recommendations to improve safety at sea. The fourth part looks into measuring the effect of inspections on the probability of casualty on either seriousness or casualty first event to show the differences across the regimes. It further gives a link of casualties that were found during inspections with either the seriousness of casualties and casualty first events which reveals three areas of improvement possibilities to potentially decrease the probability of a casualty – the ISM code, machinery and equipment and ship and cargo operations.maritime safety;correspondence analysis;binary logistic regression;probability of casualty;improvement;Port State Control Effectiveness;casualty first events;detention;port state control deficiences;target factor
Studies on Lejeuneaceae subfam. Ptychanthoideae VI. A revision of Schiffneriolejeunea sect. Saccatae from Asia
No full textThe originally monotypic eastern Malaysian genus Schiffneriolejeunea Verdoorn 1933 has now become a widespread, pantropical group of about fifteen species by the inclusion of species from the genus Ptychocoleus Trev. nom. illeg. Six species are known from Asia, three of which constitute the sect. Saccatae (Verdoorn) Gradst. & Terken comb. nov. These are the widespread Schiffneriolejeunea tumida (Nees) Gradst., the eastern Malaysian S. cumingiana (Mont.) Gradst. and S. nymannii (Steph.) Gradst. & Terken comb. nov. Schiffneriolejeunea tumida is a rather polymorphic species in which two not sharply defined varieties may be distinguished: S. tumida var. tumida with more or less involuted leaf margins, and S. tumida var. haskarliana (Gott.) Gradst. & Terken comb. nov. with plane margins
WR 280 Practicum Report: Wildlife Management Techniques
No full textWildland RecreationAs part of the Wildland Recreation Spring Practicum, the author worked at the Fort St. John Fish and Wildlife Branch of the Ministry of Environment and Parks for two weeks, under the supervision of Rob Woods, Habitat Protection Technician. The author's volunteer work gave him an understanding of wildlife management techniques that included radio telemetry, classified counts, and ungulate aging/Harvest Cards
Studies on Lejeuneaceae Subfam. Ptychanthoideae, V. A Review of the Species from Ceylon
No full textIn the spring of 1966, the junior author (H. Inoue) made a bryophyte collecting trip to Ceylon (now Sri Lanka) with the support of the Japan Society for the Promotion of Science. The collections have served as a basis for reviews of individual liverwort genera or families occurring in Ceylon, e.g. Frullania (Hattori, 1979) and Plagiochila (Inoue, 1979). The present paper deals with the species of Lejeuneaceae subfamily Ptychanthoideae, which comprises the more robust members of this large tropical family.
In his catalogue of the liverworts of Ceylon, Abeywickrama (1959) recorded 18 species of Ptychanthoideae, belonging to the genera Archilejeunea (1 sp.), Brachiolejemea (1 sp.), Lopholejeunea (2 sp.), Mastigolejemea (2 sp.), Ptychanthus (4 spp.), Ptychocoleus (5 spp.), Spruceanthus (1 sp.), Thysananthus (1 sp.), and Trocholejeunea (1 sp.). Unfortunately, his catalogue does not provide precise information on specimens or literature on which individual species records for Ceylon were based. Most of the species listed by Abeywickrama had been treated by Verdoorn (1934) in his monograph of Asiatic Ptychanthoideae. Some are now considered synonyms, however, whereas in other cases some doubts may be cast about the correctness of the identification. Since we have not been able to locate all specimens on which previous Ceylon records of Ptychanthoideae were based, the present review should be considered preliminary
Lophozia perssonii Buch & S. Arnell in Nederland
No full textThe first record of Lophozia perssonii for the Netherlands, from an old and deep limestone-quarry near Cadier en Keer, S. Limburg. Sterile L. perssonii grows here as a pioneer on shaded, calcareous tufa blocks together with Leiocolea badensis and other bryophytes. The differences with related species are discussed, and a description of the ecology is given
Toward autonomous exploration in confined underwater environments
No full textAuthor Posting. © The Author(s), 2015. This is the author's version of the work. It is posted here by permission of John Wiley & Sons for personal use, not for redistribution. The definitive version was published in Journal of Field Robotics 33 (2016): 994-1012, doi:10.1002/rob.21640.In this field note we detail the operations and discuss the results of an experiment conducted
in the unstructured environment of an underwater cave complex, using an autonomous underwater vehicle (AUV). For this experiment the AUV was equipped with two acoustic
sonar to simultaneously map the caves’ horizontal and vertical surfaces. Although the
caves’ spatial complexity required AUV guidance by a diver, this field deployment successfully demonstrates a scan matching algorithm in a simultaneous localization and mapping (SLAM) framework that significantly reduces and bounds the localization error for fully
autonomous navigation. These methods are generalizable for AUV exploration in confined
underwater environments where surfacing or pre-deployment of localization equipment are
not feasible and may provide a useful step toward AUV utilization as a response tool in
confined underwater disaster areas.This research work was partially sponsored by the EU FP7-Projects: Tecniospring-
Marie Curie (TECSPR13-1-0052), MORPH (FP7-ICT-2011-7-288704), Eurofleets2 (FP7-INF-2012-312762),
and the National Science Foundation (OCE-0955674)
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