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  • 1
    Electronic Resource
    Electronic Resource
    Abundance of arbuscular mycorrhizal fungi spores in different environments in a tropical rain forest, Veracruz, Mexico (1999)
    Springer
    Mycorrhiza 8 (1999), S. 267-270 
    Details
    ISSN: 1432-1890
    Keywords: Key words Arbuscular mycorrhizae ; Tropical rain forest ; Gaps ; Mexico
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The aim of this study was to compare mycorrhizal abundance and diversity in sites with different regimes of disturbance in a tropical rain forest at Los Tuxtlas, Veracruz, Mexico. Arbuscular mycorrhizal spores were quantified at two sites: closed canopy and gaps in the forest. Data were recorded during dry, rainy, and windy ("nortes") seasons. Spores of eight Glomus species, sporocarps of three Sclerocystis species, three species of Acaulospora and two of Gigaspora were found. Significant differences in the number of species and spores were found among seasons. The highest numbers of species and spores were observed during the dry season, with a marked decrease during the rainy season. Our results show that disturbance does not but seasonality does affect abundance and richness of mycorrhizal spores in this tropical wet forest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005720050244
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  • 2
    Electronic Resource
    Electronic Resource
    The macrobenthic fauna of a former perennial and now episodically filled mexican saline lake (1996)
    Springer
    International journal of salt lake research 5 (1996), S. 261-274 
    Details
    ISSN: 1573-8590
    Keywords: episodic playa lakes ; macroinvertebrates ; Mexico ; salt lakes ; temporary waters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geography
    Notes: Abstract Totolcingo (El Carmen), a large and now episodically filled playa lake in the east-ernmost portion of the Mexican Plateau, filled with water in 1993. Water persisted for just one month (May). Alkaline (pH ≈ 10), saline (K25 up to 30,000μS/cm) waters, dominated by NaHCO3 and Na2CO3, characterized the lake. The fauna was depauperate. The components of the fauna wereEphydra (Hydropyrus)hians Say (ephydrid),Limnodrilus hoffmeisteri Claparède (tubificid), andBerosus sp. (Coleoptera). The species in the lake were widely dispersed and typical inhabitants of saline lakes. Possible reasons for the depauperate fauna include (a) overall physical and chemical conditions, (b) unpredictable hydrology, and (c) the short (one month) inundation period prevented colonization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01997141
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  • 3
    Electronic Resource
    Electronic Resource
    Stress Field Estimations for Colima Volcano, Mexico, Based on Seismic Data (1999)
    Springer
    Bulletin of volcanology 60 (1999), S. 568-580 
    Details
    ISSN: 1432-0819
    Keywords: Key words Colima volcano ; Mexico ; Volcanic earthquakes ; Stress field ; Focal mechanism ; Seismicity ; Jalisco Block ; Colima Rift Zone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  For first time, during 1991, seismic activity was recorded during an eruption at Colima volcano. We analyze these data to obtain a stress pattern using a composite focal mechanism technique. From the analysis of regional seismicity, the Tamazula Fault and the Armeria River appear as active features and the dip of the slab east of the Jalisco Block is approximately 12°. Southwest of Colima volcano a vertical alignment of seismic events was observed. We estimate five different composite focal mechanism solutions from our data set, which indicate a change of the stress field at the volcano after the 1991 eruption. These solutions suggest that the stress field in the volcanic edifice was controlled by stresses related to the emplacement of magma superimposed on the regional stress field. No evidence of active local faults in the volcanic edifice was found. We propose a model for the eruptive process that involves tilting of the volcanic edifice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004450050252
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  • 4
    Electronic Resource
    Electronic Resource
    Isabela Crater-Lake: a Mexican insular saline lake (1998)
    Springer
    Hydrobiologia 381 (1998), S. 1-7 
    Details
    ISSN: 1573-5117
    Keywords: Tropical limnology ; meromixis ; nutrients ; plankton ; Nayarit ; Mexico ; Isabela island
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Isabela Crater-Lake is a bright-green, hypersaline lake (68–112.5 mS cm-1) on Isabela Island off the Pacific coast of Nayarit, Mexico. Some salient features were documented in November 1993. It appears meromictic, with three well-defined strata separated by sharp pycnoclines. Surface water was warm (32 °C) reaching a subsurface (0.5–1 m) maximum temperature (33 °C), declining gradually to 26.7 °C at maximum depth (17.5 m). Dissolved oxygen was near saturation at the surface, attained 145 percent saturation at 0.5 m, but was completely absent by 2.5 m. Eh was maximum at the surface (123 mV), declining to a minimum at 3 m (–261 mV), and was about –240 mV from 3.5 m to the bottom. The pH varied from 9.3 in surface waters to slightly acid (6.4) in deep anoxic layers. Atypically, NO3 was more abundant than NH4 in both aerobic and anaerobic strata. PO4 and SiO2 concentrations were extremely high. The planktonic microbial community was formed by four groups: bacteria (photosynthetic sulfur bacteria and heterotrophic bacteria), phytoflagellates (mainly cryptomonads), heterotrophic nanoflagellates ( Spumella spp., Bodo spp.) and ciliates (Hypotricha and Oligotricha). Bacteria occurred throughout the water column, but other biota were restricted to surface waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003239910574
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  • 5
    Electronic Resource
    Electronic Resource
    Littoral protozoan assemblages from two Mexican hyposaline lakes (1998)
    Springer
    Hydrobiologia 381 (1998), S. 9-13 
    Details
    ISSN: 1573-5117
    Keywords: aufwuchs ; polyurethane foam units ; colonization ; saline lakes ; crater lakes ; Mexico
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Littoral protozoan assemblages from two hyposaline crater-lakes (Lakes Alchichica and Atexcac) located in the Oriental Valley, center of Mexico, were studied using the polyurethane foam units (PFU) colonization method. Fifteen PFU (5 dates, three replicates per date, 64 × 72 × 50 mm) were located in the littoral area of each lake and collected at 8, 14, 20–21, 28–29 and 38–39 d intervals. Both lakes were hyposaline (Salinity between 6 and 7.1 g l-1) and alkaline (pH range: 8.4–9.1). Eighty seven species were observed in both lakes. In Alchichica 44 species and 43 in Atexcac. Ciliates and flagellates species dominated the assemblages' composition. The flagellates Bodo caudatus and Spumella termo and the ciliate Cyclidium glaucoma were the most abundant species in Alchichica, while in Atexcac the flagellates Cryptomonas ovata and B. caudatus and the ciliates C. glaucoma and Stylonychia notophora were most abundant. Except for S. notophora, which consumes algae, the other species are mainly bactivores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003291927412
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