Mariusz Janczur

Mariusz Janczur
Universidad Autónoma del Estado de México (UAEM) · Facultad de Ciencias

Ph.D.

About

38
Publications
40,431
Reads
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238
Citations
Citations since 2016
21 Research Items
137 Citations
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
Introduction
My research interest concerns the interactions among organisms. Actually I am working on differences in defense traits among sexual forms of Opuntia robusta, an endemic Mexican plant. Also, I am working on models concerning optimal energy allocation to growth, reproduction and defense in plants. Additionally, I am interested to understand how the type of migration and of habitat affects the evolution of morphology in birds.
Additional affiliations
August 2011 - present
Universidad Autónoma del Estado de México (UAEM)
Position
  • Lecturer
Description
  • Natural selection in vertebrates. The course included mainly the mathematical models in population genetics, the use of the theory of games in evolutionary biology, optimal proportion of sexes, kin altruism, reciprocal altruism, optimal brood size
February 2008 - present
Universidad Autónoma del Estado de México (UAEM)
Position
  • Lecturer
Description
  • Ornithology
February 2007 - June 2011
Universidad Autónoma del Estado de México (UAEM)
Position
  • Lecturer
Description
  • Evolutionary Biology
Education
October 1982 - June 1987
Jagiellonian University
Field of study
  • Biology

Publications

Publications (38)
Article
Domatia are hollow structures in plants occupied by ant colonies, in turn ants provide protection against herbivores. In plants, competition for resources has driven sex-related changes in the patterns of resource allocation to life-history traits and defence traits. The resource-competition hypothesis (RCH) proposes that female plants due to their...
Article
Full-text available
The optimal defence hypothesis predicts that increased plant defence capabilities, lower levels of damage, and lower investment in vegetative biomass will occur more frequently in sexual forms with higher resource-demanding tissue production and/or younger plant parts. We aimed to examine the effects of sexual form, cladode, and flower age on growt...
Preprint
Full-text available
The Optimal Defense Hypothesis (ODH) predicts that younger, more valuable plant organs should be better defended. We tested this hypothesis in Opuntia robusta Wendl. since its sequential, hierarchical and segmented architecture permits the consideration of a possible reallocation of secondary metabolites among cladodes with different age. We perfor...
Article
Full-text available
To our knowledge, there are no studies about the structure and ecological function of extrafloral nectaries (EFNs) in Opuntia robusta. This is the first description of EFNs in O. robusta, where young spines have an interesting structure and a secreting function, which are different from EFNs described in other Cactaceae species. We used light, scan...
Article
Full-text available
To our knowledge, there are no studies about the structure and ecological function of extra- floral nectaries (EFNs) in Opuntia robusta. This is the first description of EFNs in O. robusta, where young spines have an interesting structure and a secreting function, which are differ- ent from EFNs described in other Cactaceae species. We used light,...
Data
The relationship between relative air humidity and air temperature (A) or sampling time (B), and between air temperature and sampling time (C). (PDF)
Data
The relationship between cladode length (A), width (B), or thickness (C) and air temperature, as well as between cladode length (D), width (E), or thickness (F) and relative air humidity. (PDF)
Data
The number of ants observed on sprouts with a given size (length, width, thickness), together with air temperature and humidity recorded at the moment of sampling. (XLSX)
Data
Ants’ activity on cladode sprouts. Ants searched mainly the apical secretory cones of young spines in areoles. We observed the secretion of transparent liquid, which attracted and fed ants. (MP4)
Preprint
We cut 1 g of each sample in such way that it contained the cuticle from one side of the sample. We homogenized it with 35 ml of the methanol 100%, and left them in ultrasonic 6 l bath during 30 min at room temperature. Methanol extracts obtained were filtered, placed in amber bottles to avoid degradation by light, and stored at –20°C until process...
Preprint
The presence and structure of EFNs in Opuntia robusta had not been investigated. We used light, scanning-electron, and transmission-electron microscopy to examine morphology, anatomy, and ultrastructure of the secretory spines in areoles in female and hermaphrodite individuals of O. robusta. Young cladodes develop areoles with modified and secretor...
Preprint
The presence and structure of EFNs in Opuntia robusta had not been investigated. We used light, scanning-electron, and transmission-electron microscopy to examine morphology, anatomy, and ultrastructure of the secretory spines in areoles in female and hermaphrodite individuals of O. robusta. Young cladodes develop areoles with modified and secretor...
Preprint
The presence and structure of EFNs in Opuntia robusta had not been investigated. We used light, scanning-electron, and transmission-electron microscopy to examine morphology, anatomy, and ultrastructure of the secretory spines in areoles in female and hermaphrodite individuals of O. robusta. Young cladodes develop areoles with modified and secretor...
Article
Full-text available
Eimeria pileata Soriano-Vargas, Medina, Salgado-Miranda, García-Conejo, Galindo-Sánchez, Janczur, Berto and Lopes, 2015 is a junior homonym of Eimeria pileata Straneva and Kelley, 1979 and needs to be replaced. This coccidium was described from a rufous-capped brush finch Atlapetes pileatus Wagler in the Nevado de Toluca Natural Protected Area, Mex...
Article
Full-text available
During our previous study (Janczur et al. 2014), we saw adult Euphoria inside the flowers of Opuntia robusta (Wendland) (Fig. 1A) and Opuntia spinulifera (Scheinvar) (Fig. 1B). To ensure a correct identification, we collected one male and two females in San Nicolás Tecoaco, municipality of Singuilucan, Hidalgo on 15 April 2014. These were identifie...
Article
During our previous study), we saw adult Euphoria inside the flowers of Opuntia robusta (Wendland) and Opuntia spinulifera (Scheinvar). To ensure a correct identification, we collected one male and two females in San Nicolás Tecoaco, municipality of Singuilucan, Hidalgo on 15 April 2014. These were identified as E. basalis. After consulting the lit...
Article
Full-text available
A new coccidian species (Protozoa: Apicomplexa: Eimeriidae) collected from the red warbler Cardellina rubra (Swainson) is reported from the Nevado de Toluca National Park, Mexico. Isospora cardellinae n. sp. has subspherical oöcysts, measuring on average 26.6 × 25.4 μm, with smooth, bi-layered wall, c.1.3 μm thick. Micropyle, oöcyst residuum, and p...
Article
Full-text available
A new coccidian species (Protista: Apicomplexa: Eimeriidae) collected from the rufous-capped brush finch Atlapetes pileatus Wagler in the Nevado de Toluca Natural Protected Area, Mexico. Oöcysts of Eimeria pileata n. sp. are ellipsoidal, measuring on average 16.5 × 14.1 μm, with a smooth, bi-layered wall. Micropyle and oöcyst residuum are absent, b...
Article
Full-text available
In this study, we found unsporulated coccidia oocysts in passerines from the Nevado de Toluca National Park, Mexico. We captured birds and took samples of their droppings during three field visits. We examined a total of 72 fecal samples and found unsporulated coccidia oocysts in 10 samples from five passerine species: Atlapetes pileatus (3), Carde...
Article
A new coccidian species (Protista: Api-complexa: Eimeriidae) is described from the orange-crowned warbler Oreothlypis celata (Say) collected in the Nevado de Toluca National Park, Mexico at 3,000 metres above sea level. Isospora celata n. sp. has subspheroidal oöcysts, measuring 28.4 9 26.4 lm, with smooth, bi-layered wall c.1.2 lm thick. Micro-pyl...
Article
Full-text available
In this study we examined diet, reproduction, and sexual dimorphism in body size of adult Thamnophis eques. We measured 307 adult snakes within the hydrologic system of High Lerma. Prey was obtained by forced regurgitation when snakes were collected, and gravid females were housed in the laboratory until parturition. Females had a longer snout-vent...
Article
Full-text available
Sexually dimorphic plants provide an excellent opportunity for examining the differences in the extent of their defense against herbivores because they exhibit sex-related differences in reproductive investment. Such differences enable comparison of the sex with high reproduction expenses with the sex that expends less. The more costly sex is usual...
Article
Full-text available
Protoporphyirin-IX (PP-IX) is a precursor of the biosynthesis of the hemo group, most of the cytochromes and the chlorophylls. The PP-IX is used for medical purposes, and recently a report indicated that it exhibits a dual action since it can decrease or increase the genetic damage caused by N-nitroso-N-ethylurea (ENU) in so-matic cells of Drosophi...
Article
Full-text available
Food habits of the white-tailed deer, Odocoileus virginianus (Artiodactyla: Cervidae) in Nanchititla Natural Park, Mexico. White-tailed deer is a species with a large behavioral plasticity and adaptation to different habitats, including their food habits. This study was conducted with the aim to determine the food habits of this species in the clou...
Article
Full-text available
White-tailed deer is a species with a large behavioral plasticity and adaptation to different habitats, including their food habits. This study was conducted with the aim to determine the food habits of this species in the cloud (BMM) and pine-oak (BPE) forests. Deer scats and plant samples were obtained following standard methods, from Sierra Nanc...
Article
Full-text available
The effects on the aroma compositions of ethanol extracts obtained by traditional and enzyme-assisted methods from seven killing conditions used in vanilla pod curing were studied. Two procedures of vanilla pod killing consisted of either freezing pods at −10 °C for 24 h or immersing pods in 80 °C water for 10 s each of three times with 30 s interv...
Article
Full-text available
Optimal foraging theory predicts that predators choose the most energetically profitable prey. At the northern limit of its distribution the puma Puma concolor tends to prey on large mammals, whereas at the southern limit its prey comprises medium-sized and small mammals. We analysed the puma's food habits in Central Mexico, and concluded that the...
Article
Full-text available
Question: Does allocation to the production of defensive substances in plants affect Such characteristics as growth rate, time of maturation, size at maturity, current and lifetime reproductive success? Numerical method: Dynamic programming algorithm to analyse the optimal energy allocation to growth, reproduction, and production of defensive subst...
Chapter
Full-text available
We use here a life-history approach in order to explain some ecotoxicological phenomena, such as toxicant concentration in the body, optimal lifespan, age at maturity and adult body size. A life-history approach has been applied already in a number of ecotoxicological studies (e.g., Kammenga et al. 1996, Kammenga et al. 1997), however these are bas...
Article
Full-text available
There is controversy about what fitness measure to maximize in life-history models: the Malthusian parameter r; or net reproductive rate R, which is equivalent to lifetime production of offspring. Neither of these can be considered universal: R is a proper measure only at population equilibrium, and r cannot remain positive and constant for long. I...

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Projects

Projects (5)
Project
To test for differences in the extent of defense between two sexual forms of Myriocarpa longipes.
Project
We study the effect of disturbance by fire on the vegetation traits as well as on the bird richness and abundance
Project
We will use scanning-electron, and transmission-electron microscopy to examine morphology and ultrastructure of the EFNs of two cacti in Tehuacán-Cuicatlán Valley, México. This project will be funded by the Cactus and Succulent Society of America. 2017-2018.