Browsing Biología by Title
Now showing items 532-551 of 851
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Macroinvertebrates as indicators in tropical streams with different land use in southern Costa Rica
(2019)Costa Rica is one of the countries with the highest species richness worldwide and forms an important land bridge between North and South America. In the past, Costa Rica suffered from deforestation due to conversion of ... -
Madres ancestrales
(2012-09)El ADN mitocondrial que portamos todos los seres humanos lo recibimos en herencia, exclusivamente, de nuestra madre. De lo que se deduce que nuestra progenitora lo recibió de su madre, quien, a su vez, lo heredó de la suya, ... -
Making the invisible visible: methods to enhance features of tiny spider webs
(2018)The characteristics and designs of webs provide valuable information on ecology, behavior and phylogenetic relationships. Characters are often obtained from detailed analyses of web photographs. We describe new methods to ... -
Male courtship behavior in Ceratitis Capitata (Diptera: Tephritidae) that have received aromatherapy with ginger root oil
(Florida Entomologist 90(1), 175-179, March 2007, 2007-03)The results of previous studies that showed that exposing mass-reared male Mediterranean fruit flies Ceratitis capitata (Wiedemann) to ginger root oil (“aromatherapy”) increases the likelihood of mating with wild females ... -
Male song variation of Green Violetear (Colibri thalassinus) in the Talamanca Mountain Range, Costa Rica
(2008)We studied variation in acoustic and temporal characteristics of the static male song of the Green Violetear (Colibri thalassinus) in a single population in Costa Rica. The static song of 19 males was extremely variable. ... -
Marine Insects
(2008)Although insects are one of the most diverse groups of organisms on earth, relatively few species are found associated with marine habitats. The majority of these marine species live in intertidal or coastal habitats and ... -
Masdevallia luerorum (Orchidaceae: Pleurothallidinae), a new species from Costa Rica
(2017)Masdevallia luerorum from the southern Pacific region of Costa Rica is described and illustrated. It resembles M. lata, but differs in the single flowered inflorescence, the shorter sepals, the broad and cylindrical sepaline ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
Memoria de investigación Reserva Forestal de San Ramón
(1991)Se incluyen una serie de investigaciones inéditas, realizadas entre 1985 y 1989, sobre la Reserva Forestal en los campos geográfico, botánico, zoológico, ecológico y ciclos de algunos nutrientes. Esto permite conocer tanto ... -
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 ...