Staphylococcus epidermidis is a common commensal of healthy conjunctiva and it can cause endophthalmitis, however its presence in conjunctivitis, keratitis blepharitis unknown. Molecular genotyping S. from could provide information about the origin strains that infect eye. In this paper two collections were used: one ocular infection (n = 62), another 45). All isolates genotyped by pulsed field gel electrophoresis (PFGE), multilocus sequence typing (MLST), staphylococcal cassette chromosome...

• Background and aims. Flowering phenology is described the effect of flowering time on pollination success evaluated in deceit-pollinated tropical orchid, Myrmecophila christinae. It was expected that, due to this species' deceit strategy low observed pollinator visit rate, there would be a higher probability natural selection events favouring individuals away from population peak.

Little is known about the reproductive biology of Crassulaceae. We studied a population Echeveria gibbiflora in Pedregal de San Angel ecological preserve Mexico City, Mexico. Each flower open and producing nectar 7 to 8 days. On days maximum production (flowers 4–6 old) an average 14.5 μl accumulates per day. The rate between 0700 0900 hours. sugar concentration 43.7%. In given flower, pollen exposed stigmas are receptive at same time. natural fruit‐set seed‐set 56.6% 35.5%, respectively....

Abstract Aim Mexico is a centre of diversity for species the genus Pinus , most which have restricted geographical distributions. An exception leiophylla Schiede and Deppe, widely distributed throughout Mexico’s mountainous regions. We attempt to reconstruct phylogeographic history this species, in order determine if its current broad distribution associated with major events environmental change that occurred during Quaternary. Location Coniferous forests Sierra Madre Occidental, Eje...

From a large-scale sampling of limnoterrestrial tardigrades in the Valley Mexico Basin, Huasteca Potosina, and Monarch Butterfly Sanctuary, Mexico, we develop an initial species list determine type vegetation substrates for most sampled species. In total 160 moss samples over 2000 were obtained, belonging to 17 genera, 35 putative species, one subspecies, which eight could be accurately identified or three affinity, 15 as morpho-species; remaining genus, mainly due few...

Historic demography changes of plant species adapted to New World arid environments could be consistent with either the Glacial Refugium Hypothesis (GRH), which posits that populations contracted refuges during cold-dry glacial and expanded in warm-humid interglacial periods, or Interglacial (IRH), suggests interglacials times. These contrasting hypotheses are developed present study for giant columnar cactus Cephalocereus columna-trajani intertropical Mexican drylands where effects Late...

Diversification between islands and ecological radiation within are postulated to have occurred in the Euphorbia species (sect. Aphyllis subsect. Macaronesicae) on Canary Islands. In this study, biogeographical pattern of 11 Macaronesicae genetic differentiation among five were investigated distinguish potential mode mechanism diversification speciation. The patterns structure examined using statistical dispersal-vicariance analysis, Bayesian phylogenetic reduced median-joining haplotype...

It is well known that animals can exert strong selective pressures on plant traits. However, studies the evolutionary consequences of plant-animal interactions have mainly focused understanding how these shape trait means, while overlooking its potential direct effect variability among structures within a (e.g. flowers and fruits). The degree within-plant fitness effects but few evaluated role as target selection. Here we reanalysed data Ipomoea wolcottiana stigma-anther distance to test...

1. An experimental approach, manually pollinating all the flowers of individual plants, was used to measure effect pollen limitation on female fecundity hummingbird‐pollinated perennial shrub Echeveria gibbiflora in ecological preserve Pedregal de San Angel around México City, México. Eleven randomly selected plants were over‐pollinated their and another 11 left be freely visited by natural pollinators. 2. Manually pollinated produced significantly more fruit seeds than control (1·38 1·74...

Habitat fragmentation and disturbance are two of the most significant drivers species extinctions in plant populations. The degree impact on populations depends level specificity plant–animal interactions, as well availability suitable sites for seedling recruitment. In this study, we describe population density structure, pollen limitation reproductive success endangered tropical orchid Myrmecophila christinae, an epiphytic with a specialized pollination system. We surveyed total 14 located...

ABSTRACT The nectar resource environment across which nectarivores forage may be patchy and variable. To understand the sources consequences of such a variation, production was investigated in Calliandra longipedicellata . Nectar measured once month throughout 3‐mo winter season two successive years at three sites. We also conducted diurnal nocturnal field observations to describe visitation rates floral visitors, pollinator exclusion experiment evaluate pollination In all populations,...

Ruellia nudiflora has shown a high potential to easily invade disturbed areas. Outcrossing rate and genetic structure diversity in this species were examined along climatic gradient the Yucatán Peninsula (Mexico) order understand effects of environmental heterogeneity – isolation by environment (IBE) as well correlation herkogamy on structure, diversity, demographic history species. Nine populations sampled temperature-precipitation with marked differences vegetation, measuring degree each...

Staphylococcus epidermidis can cause prosthetic joint infections. Strategies to differentiate between healthy skin and infections isolates are relatively ineffective, which makes necessary search for new differential biomarkers. has eleven surface proteins, denoted as Ses proteins. In this work, ses genes used biomarkers isolates. All (n = 51) were genotyped by pulsed-field gel electrophoresis. icaA, embp, sesA-I, sdrF determined PCR. The phenotypic data included biofilm production...

ABSTRACT In recent years the coastal dune vegetation of state Yucatan, Mexico has become highly fragmented due to clearing for development. We evaluated patterns genetic differentiation and variability among orchid populations ( Myrmecophila christinae var ) in eight habitat fragments along a west‐to‐east disturbance gradient which sites located on western end began experiencing fragmentation earlier than those east. Leaf samples from adult individuals juvenile plants were collected all...

Background: The breeding system of Mammillaria magnimamma was initially described as hermaphroditic. However, some individuals in a natural population at Valle del Mezquital exhibited seemingly non-functional androecium.
 Objectives: To determine the M. through morphological characterization floral types.
 Study site and years: study conducted Mezquital, Mexico, during 2019 reproductive season.
 Methods: We characterized polymorphism by means scanning electron microscopy...

Epiphytism is a frequent association in marine benthic communities where epiphytic algae play an important role, including increase species richness and primary production. Digenea mexicana perennial red alga that typically favorable host for epiphytes. To determine the spatio-temporal changes of epiphytes population D. Río Indio, Quintana Roo, México, sampling was undertaken three different weather seasons. One hundred twenty-eight taxa were identified, 44 Cyanobacteria, 42 Rhodophyta, 31...

Many plant and animal species have been domesticated in southeastern Mexican homegardens, resulting changes their genetic variability. One of the most representative fruit trees these systems is Annona squamosa L. We wanted to know if predominant type economic activity a given area affects distribution variability A. squamosa. In order answer this question, we analyzed 14 populations 5 different socioeconomic regions states Yucatán Quintana Roo, using isozyme analysis. All enzyme markers...

Kleinia neriifolia Haw. is an endemic species on the Canaian archipelago, this widespread in coastal thicket of all islands. In present study, genetic diversity and population structure K. were investigated using chloroplast gene sequences nuclear SSR (simple sequence repeat). The differentiation among island populations, historical demography, underlying evolutionary scenarios are further tested based data. Chloroplast reveals a strong divergence between eastern islands (Gran Canaria,...

The endemic Mexican cactus, Mammillaria pectinifera, shows low dispersal capabilities and isolated populations within the highly dissected landscape of Tehuacán Valley.These characteristics can restrict gene flow act upon genetic divergence speciation in arid Research Article