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Mostrando ítems 941-960 de 1643
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Mass movement of individuals at Carara National Park
(2021)The video shows the movement of individuals of the Green-and-Black Poison Dart Frog, Dendrobates auratus, under rainy conditions. The filmed individuals moved close to the researchers and in close proximity of conspecifics. ... -
Mastering analytical challenges for the characterization of pentacyclic triterpene mono- and diesters of Calendula officinalis flowers by non-aqueous C30 HPLC and hyphenation with APCI-QTOF-MS
(2016-01-25)Pentacyclic triterpene mono- and diesters have been isolated from Calendula officinalis flowers. GC–MS, APCI-Exactive Orbitrap HR-MS and NMR allowed to identify the triterpene skeleton in various samples (different triterpene ... -
Matambú y Matambuguito, buenas noticias
(2013-06-26)Se comenta la situación de la escasez de agua, y la seguridad alimentaria y nutricional, en el Territorio Indígena de Matambú. -
Maternal care and offspring behaviour in three theridiid species (Araneae, Theridiidae)
(2009)Maternal care is widespread in theridiids. Theridion evexum Keyserling breaks the threads in the outer layer of the egg sac to allow its spiderlings to leave the sac. Achae-aranea tesselata (Keyserling) and Anelosimus ... -
Maternal health in Central America: The role of medicinal plants in the pregnancy-related health and well-being of indigenous women in Central America
(2018)Over the past 20 years, Central America (CA) has made considerable progress in improving the health status of its populations. However, in some countries, the overall health status remains below average with poor outcomes ... -
Maternally derived chemical defenses are an effective deterrent against some predators of poison frog tadpoles (Oophaga pumilio)
(2014)Parents defend their young in many ways, including provisioning chemical defences. Recent work in a poison frog system offers the first example of an animal that provisions its young with alkaloids after hatching or birth ... -
Mating and aggressive behaviour of Brachyrhaphis olomina (Cyprinodontiformes: Poeciliidae)
(2017)Despite the increasing interest in the use of intro-mittent male genitalia and coercive mating behaviour in poeciliids, detailed studies of the mating behaviour of most species in this family are lacking. We describe here ... -
Mating system and pollen flow between remnant populations of the endangered tropical tree, Guaiacum sanctum (Zygophyllaceae)
(2011)Tropical trees are generally long-lived making it difficult to assess the long-term effects of habitat fragmentation on genetic diversity. Maintenance of genetic diversity in fragmented landscapes is largely dependent on ... -
Mating System of the Tent-Making Bat Artibeus watsoni (Chiroptera: Phyllostomida
(2008-12)Vertebrate mating systems are influenced by ecological and phylogenetic factors, and the variation observed in mating behavior is frequently attributable to the extent to which male assistance in the rearing of offspring ... -
Matisia Tinamasiiana (BOMBACACEAE): una nueva especie arborescente del Pacífico Central de Costa Rica
(1998)El conocimiento de la Flora de Costa Rica ha sido, en gran parte, producto de la investigación y exploración botánica realizada principalmente dentro de las áreas protegidas estatales o privadas. Las áreas fuera de los ... -
Maxillaria sanguinea f. exsanguis f. nov. A new and rare form of an attractive species of Maxillaria (Orchidaceae)
(2020-05)A new form of Maxillaria sanguinea with pale, yellowish and white flowers, is described from Costa Rica as f. exsanguis, and a composite illustration of the new taxon is provided. -
Maxillaria, an unfinished monograph.
(2012)The genus Maxillaria is a large and tediously diverse genus of orchids from throughout the Neotropics, ranging from the U.S.A. (Florida) to Bolivia and the West Indies. Estimates put the number of species in the genus ... -
Maxillariella vulcanica
(2017)Maxillariella vulcanica is recognized by the ascending habit, slender cane-like stems bearing few, ellipsoid pseudobulbs. The flowers are white, diversely su used and spotted with pink, the lip bears a conspicuous callus ... -
Mecanismo de acción de miotoxinas aisladas de venenos de serpientes
(1984)Biochemically and pharmacologically, myotoxins isolated from snake venoms can be placed in four main groups: myolaxic phospholipases A, low molecular weight basic toxins, cardiotoxins, and hemorrhagic myotoxins. The myotoxic ... -
Mecanismos de tolerancia al arsénico en Justicia pectoralis var. Pectoralis (Acanthaceae): captación, reducción y desintoxicación
(2022)El arsénico es uno de los elementos más tóxicos liberados al ambiente, lo que lo convierte en una amenaza para los ecosistemas y la salud humana. Justicia pectoralis es una planta herbácea de rápido crecimiento y tolerante ... -
Medfly courtship duration: a sexually selected reaction norm changed by crowding
(Ethology Ecology & Evolution 10: 369-382, 1998, 1998-10)The evolutionary effects of crowding on male courtship behavior were studied using wild and mass-reared medflies. Mass-reared strains had been raised under highly crowded conditions in mass-rearing facilities for ... -
Megaherbivore exclusion led to more complex seagrass canopies and increased biomass and sediment Corg pools in a tropical meadow
(2022)In some regions of the Caribbean Sea, seagrasses have been negatively affected by sea turtle overgrazing. Seagrass canopy complexity has declined at a long-term monitoring site in Costa Rica. We deployed megaherbivore ... -
Meiotic Chromosome Behavior and Capsule Setting in Doritaenopsis Hybrids
(J. AMER. SOC. HORT. SCI. 133(1):107–116. 2008, 2008-10-06)The development of new cultivars in Doritaenopsis Guillaum. & Lami orchids is often hindered by factors such as low seed count in hybrids. Cytological study may offer the ability to develop new hybrids by revealing cultivars ... -
Mercury levels in muscle tissue of four common elasmobranch species from the Pacific coast of Costa Rica, Central America
(2016-01)Mercury (Hg) is a non-essential and toxic element that is ubiquitous in the marine environment and biomagnifies through food webs. Given the high trophic position of many elasmobranch species, it is important to quantify ...