Helminth Parasites of Freshwater Fishes of the Ayuquila River, Sierra de Manantlán Biosphere Reserve, West Central Mexico

Portland cement concretes were prepared by adding different igneous materials from west central Mexico. The results of the mechanical testing of these materials show the feasibility of employing igneous minerals to produce concretes and mortars, provided a careful control of granulometry and the geochemistry involved is attained. The mechanical performance, as well as the workability of the slurries can be managed by the convenient use of commercial additives (i.e. water reducers and aging accelerators). These results open the attractive possibility of expanding the natural sources of concrete-forming elements.

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Dietary adaptability of Late Pleistocene Equus from West Central Mexico

Palaeogeography Palaeoclimatology Palaeoecology ◽

10.1016/j.palaeo.2015.10.019 ◽

2016 ◽

Vol 441 ◽

pp. 748-757 ◽

Cited By ~ 12

Author(s):

Alejandro H. Marín-Leyva ◽

Daniel DeMiguel ◽

María Luisa García-Zepeda ◽

Javier Ponce-Saavedra ◽

Joaquín Arroyo-Cabrales ◽

...

Keyword(s):

Late Pleistocene ◽

Central Mexico ◽

West Central

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The ecology of parasites of freshwater fishes: the search for patterns

Parasitology ◽

10.1017/s0031182009005794 ◽

2009 ◽

Vol 136 (12) ◽

pp. 1653-1662 ◽

Cited By ~ 27

Author(s):

C. R. KENNEDY

Keyword(s):

Community Dynamics ◽

Parasite Community ◽

Freshwater Fishes ◽

Convincing Evidence ◽

Helminth Parasites ◽

Parasite Communities ◽

Space And Time ◽

Long Time ◽

Population And Community Dynamics ◽

Parasite Populations

SUMMARYDevelopments in the study of the ecology of helminth parasites of freshwater fishes over the last half century are reviewed. Most research has of necessity been field based and has involved the search for patterns in population and community dynamics that are repeatable in space and time. Mathematical models predict that under certain conditions host and parasite populations can attain equilibrial levels through operation of regulatory factors. Such factors have been identified in several host-parasite systems and some parasite populations have been shown to persist over long time-periods. However, there is no convincing evidence that fish parasite populations are stable and regulated since in all cases alternative explanations are equally acceptable and it appears that they are non-equilibrial systems. It has proved particularly difficult to detect replicable patterns in parasite communities. Inter-specific competition, evidenced by functional and numerical responses, has been detected in several communities but its occurrence is erratic and its significance unclear. Some studies have failed to find any nested patterns in parasite community structure and richness, whereas others have identified such patterns although they are seldom constant over space and time. Departures from randomness appear to be the exception and then only temporary. It appears that parasite communities are non-equilibrial, stochastic assemblages rather than structured and organized.

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Composition and structure of vegetation and tide regulate the occurrence of Oryzomys couesi and Hodomys alleni in mangrove forests of Laguna de Cuyutlán, West-Central Mexico

Wetlands Ecology and Management ◽

10.1007/s11273-021-09831-7 ◽

2021 ◽

Author(s):

Judit Torres-Fernández del Campo ◽

Miguel Olvera-Vargas ◽

Fernando Silla-Cortés ◽

Blanca Lorena Figueroa-Rangel ◽

Luis Ignacio Iñiguez-Dávalos

Keyword(s):

Central Mexico ◽

Mangrove Forests ◽

West Central ◽

Composition And Structure

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Tequila and other Agave spirits from west-central Mexico: current germplasm diversity, conservation and origin

Plant Conservation and Biodiversity ◽

10.1007/978-1-4020-6444-9_6 ◽

2007 ◽

pp. 79-93

Author(s):

Patricia Colunga-GarcíaMarín ◽

Daniel Zizumbo-Villarreal

Keyword(s):

Central Mexico ◽

West Central ◽

Germplasm Diversity

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Post-fire recovery of ecosystem carbon pools in a tropical mixed pine-hardwood forest

Forest Systems ◽

10.5424/fs/2020291-14984 ◽

2020 ◽

Vol 29 (1) ◽

pp. e001

Author(s):

Shatya Devi Quintero-Gradilla ◽

Angelina Martínez-Yrizar ◽

Felipe Gracía-Oliva ◽

Ramón Cuevas-Guzmán ◽

José Enrique Jardel-Peláez

Keyword(s):

Woody Debris ◽

Mineral Soil ◽

Biosphere Reserve ◽

Hardwood Forest ◽

Carbon Pools ◽

Research Station ◽

C Storage ◽

Ecosystem Carbon ◽

Sierra De Manantlán ◽

Downed Woody Debris

Aim of the study: To analyze the recovery pattern of carbon pools in terms of size and the relative contribution of each pool to total ecosystem C along a fire chronosequence of tropical mixed pine-hardwood forest.Area of the study: Las Joyas Research Station (LJRS), core zone of Sierra de Manantlán Biosphere Reserve (SMBR) in the state of Jalisco, central western Mexico.Materials and methods: Carbon stored in aboveground plant biomass, standing dead trees, downed woody debris, forest floor, fine roots and mineral soil, was compared with a nested analysis of variance (ANOVA) in post-fire stands of eight-year-old, 28- and 60-year-old stands of mixed Pinus douglasiana-hardwood forest.Main results: The total ecosystem carbon in eight-year-old stands was 50% lower than that of 60-year-old stands. Carbon content in the biomass and mineral soil increased with stand age. The carbon in the biomass recovered to the undisturbed forest in the 28 years of succession. The main C storage in the eight-year-old stands were the mineral soil (64%) and downed woody debris (18%), while in the 28- and 60-year-old stands, live tree biomass and mineral soil were the two largest components of the total C pool (43% and 46%, respectively).Research highlights: We found a significant effect of high-severity fire events on ecosystem C storage and a shift in carbon distribution. The relatively fast recovery of C in ecosystem biomass suggests that mixed Pinus douglasiana hardwood forest possess functional traits that confer resilience to severe ﬁre events.Key words: chronosequence; carbon dynamics; mineral soil; Pinus douglasiana; fire effects.Abbreviations used: LJRS, Las Joyas Research Station; DBH, diameter at breast height; DL, duff layer; LL, litter layer; DWD, downed woody debris; ANOVA, analysis of variance; CO2, carbon dioxide; SMBR, Sierra de Manantlán Biosphere Reserve; C, carbon. AGV, above ground vegetation.

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