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  • 1
    Electronic Resource
    Electronic Resource
    Foliole movement and canopy architecture of Larrea tridentata (DC.) Cov. in Mexican deserts (1992)
    Springer
    Oecologia 92 (1992), S. 83-89 
    Details
    ISSN: 1432-1939
    Keywords: Larrea tridentata ; Mexico ; Deserts ; Canopy architecture ; Foliole movement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The creosote bush (Larrea tridentata) is a common desert perennial with bifoliate, amphistomatic, divaricate leaves. The leaves can vertically close their folioles and vary their profile with respect to direct solar radiation. Field data from different Mexican deserts showed a significant correlation between foliole aperture and mean foliole inclination: in plants in which folioles were more open, the foliole surfaces were less vertical. In a series of field experiments in the Chihuahuan Desert, foliole aperture varied significantly with the water-status of the plant and the hour of the day. In moist plants, folioles opened in the early morning and closed in the afternoon. Water-stressed plants showed significantly lower foliole apertures. A simulation of the light interception patterns of the plants showed that foliole closure in water-stressed individuals reduces direct radiation interception by around 24%. Most (64%) of the reduction in interception was due to the vertical inclination of the photosynthetic surfaces induced by foliole closure in the water-stressed plants. The rest (36%) of the reduction in interception was due to differential self-shading between foliole pairs, which was higher in the closed folioles of the water-stressed plants, but operated more towards the early hours of the day.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317266
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  • 2
    Electronic Resource
    Electronic Resource
    Germination response to temperature, salinity, light and depth of sowing of ten tropical dune species (1992)
    Springer
    Oecologia 92 (1992), S. 343-353 
    Details
    ISSN: 1432-1939
    Keywords: Dunes ; Germination ; Mexico ; Ecophysiology ; Neotropic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This study describes the germination responses of ten tropical dune species to several factors to which their seeds are exposed in the field. Species studied were: three sand dune endemics (Amaranthus greggii, Palafoxia lindenii, and Trachypogon gouini), three pantropical coastal species (Sesuvium portulacastrum, Sporobolus virginicus and Ipomoea stolonifera) and four cosmopolitan grasses also found inland (Panicum repens, Panicum maximum, Pappophorum vaginatum and Andropogon glomeratus). Six species germinated when exposed to different constant temperatures. Four required temperature fluctuation (S. portulacastrum, P. lindenii, S. virginicus, P. repens). Light promoted germination of three species (S. Portulacastrum, P. vaginatum, P. lindenii). Species varied in their degree of sensitivity to salinity. Seeds of T. gouini, I. stolonifera, S. portulacastrum, P. repens, P. Maximum and P. vaginatum were able to germinate under some of the salinity concentrations. Not all species were able to recover after being transferred to distilled water. Seedling emergence was inhibited when seeds were buried. This response was related to depth and to seed size. S. portulacastrum and S. virginicus were the most affected. Nitrates only affected germination response of two species. Seed age promoted germination under a wider range of conditions. P. lindenii showed very heterogeneous responses depending on seed cohort. No dormancy mechanisms were found, other than a thermoperiod and/or light requirement for some of the species. Cosmopolitan grasses tolerated both sand burial and salinity, although the endemics were the most successful in emerging from sand burial; coastal pantropicals were very tolerant to high saline concentrations and recovered completely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317460
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  • 3
    Electronic Resource
    Electronic Resource
    Distribution of species of Anostraca, Notostraca, Spinicaudata, and Laevicaudata in Mexico (1991)
    Springer
    Hydrobiologia 212 (1991), S. 209-219 
    Details
    ISSN: 1573-5117
    Keywords: Anostraca ; Notostraca ; Spinicaudata ; Laevicaudata ; Branchiopoda ; Mexico ; distribution ; conchostracan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We inventorize the known distribution of the species of Anostraca, Notostraca, Spinicaudata, and Laevicaudata present in Mexico. Determinations of the species and their distribution involved: 1) Examination of Mexican collections of phyllopods, 2) Extensive sampling in 17 states, and 3) Study of laboratory cultures. The number of phyllopod species known to occur in Mexico is 27: 14 of Anostraca, including three undescribed species, 1 of Notostraca, 10 of Spinicaudata, and 2 of Laevicaudata. These results also include 44 new state records. The records of Branchinecta packardi are the first for Mexico. Some species have extensive distributions, not limited to Mexico: Streptocephalus mackini, S. texanus, Thamnocephalus platyurus, Triops longicaudatus and Leptestheria compleximanus. The species known only from Mexico are Streptocephalus kargesi, S. moorei, Paralimnetis mapimi, two undescribed species of Branchinecta, and an undescribed species of Streptocephalus. The largest number of species found to occur in the same pond at one time was eight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026003
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  • 4
    Electronic Resource
    Electronic Resource
    Branchinecta belki n. sp. (Branchiopoda: Anostraca), a new fairy shrimp from Mexico, hybridizing withB. packardi Pearse under laboratory conditions (1992)
    Springer
    Hydrobiologia 239 (1992), S. 151-162 
    Details
    ISSN: 1573-5117
    Keywords: Branchinecta ; Branchiopoda ; Anostraca ; Mexico ; hybridization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A new fairy shrimp,Branchinecta belki n.sp., endemic to the south of Coahuila state is described and figured. A total of nine species of phyllopods, including the new species, occur in ponds in the type area. The laboratory hybridization ofB. belki andB. packardi through ‘no-choice’ mating tests in reciprocal crosses is discussed. A mixture of characteristics of parental species is present in male F1 and F2 hybrids. This may provide a biological tool, or ‘search image’ (sensu Wiman, 1979a), for detecting male hybrids, should such exist, between theBranchinecta species of this study in nature. In addition to the reported interspecific hybridizations inStreptocephalus (Wiman, 1979a & 1979b) and inArtemia (Bowenet al., 1985) under laboratory conditions, the new evidence inBranchinecta suggests that absence of efficient premating mechanisms may be common in Anostraca.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007672
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  • 5
    Electronic Resource
    Electronic Resource
    Contribution to the knowledge of the rotifera of Mexico (1993)
    Springer
    Hydrobiologia 255-256 (1993), S. 467-474 
    Details
    ISSN: 1573-5117
    Keywords: Rotifera ; zoogeography ; Mexico
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This faunistic survey of Mexican Rotifera, covering 32 localities, mostly in Central Mexico, has yielded 96 taxa of which 41 are new to Mexican fauna. The zoogeographic status of the rotifer fauna of Mexico was reevaluated on the basis of the present data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025875
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  • 6
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    INAA of CAIs from the Maralinga CK4 chondrite: Effects of parent body thermal metamorphism (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Maralinga is an anomalous CK4 carbonaceous chondrite which contains numerous Ca-, Al-rich inclusions (CAI's) unlike the other members of the CK group. These CAI's are characterized by abundant green hercynitic spinel intergrown with plagioclase and high-Ca clinopyroxene, and a total lack of melilite. Instrumental Neutron Activation Analysis (INAA) was used to further characterize the meteorite, with special focus on the CAI's. High sensitivity INAA was done on eight sample disks about 100-150 microns in diameter obtained from a normal 30 micron thin section with a diamond microcoring device. The CAI's are enriched by 60-70X bulk meteorite values in Zn, suggesting that the substantial exchange of Fe for Mg that made the spinel in the CAI's hercynitic also allowed efficient scavenging of Zn from the rest of the meteorite during parent body thermal metamorphism. Less mobile elements appear to have maintained their initial heterogeneity.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M; p 877-878
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  • 7
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    Distribution of siderophile and other trace elements in melt rock at the Chicxulub impact structure (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Recent isotopic and mineralogical studies have demonstrated a temporal and chemical link between the Chicxulub multiring impact basin and ejecta at the Cretaceous-Tertiary boundary. A fundamental problem yet to be resolved, however, is identification of the projectile responsible for this cataclysmic event. Drill core samples of impact melt rock from the Chichxulub structure contain Ir and Os abundances and Re-Os isotopic ratios indicating the presence of up to approx. 3 percent meteoritic material. We have used a technique involving microdrilling and high sensitivity instrumental neutron activation analysis (INAA) in conjunction with electron microprobe analysis to characterize further the distribution of siderophile and other trace elements among phases within the C1-N10 melt rock.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., The Twenty-Fifth Lunar and Planetary Science Conference. Part 3: P-Z; p 1221-1222
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  • 8
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    Carbon and oxygen isotope study of carbonates from highly shocked clasts of the polymict breccia of the Haughton Crater (Canada) (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: It is known that the release of volatiles on impact is an important controlling factor in cratering processes in carbonate terranes and in the mobility of chemical elements. In order to assess the nature and the role of carbon- and oxygen-bearing volatiles during impact-induced metamorphism of sedimentary rocks, the C-13/C-12 and O-18/O-16 ratios and carbonate contents were determined for 30 shocked clasts from the Haughton Crater polymict breccia as well as for some unshocked carbonates from the sedimentary cover adjacent to the crater. Shock-induced CO2 loss during decarbonation of calcite is known to be a function of peak pressure and ambient partial pressure of the volatile species. In our clast samples, shocked from 20 to 60 GPa, we expect about 20 to 100 percent CO2 loss and preferential depletion in C-13 and O-18 in the residual carbonate. Rayleigh model (progressive loss of CO2) and batch model (single-step loss of CO2) curves for this depletion are shown. The magnitudes of the C-13 and O-18 depletions increase with the increase of the CO2 loss. In addition, the isotopic depletions should be correlated with an enrichment in CaO and MgO in the residual solid.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., International Conference on Large Meteorite Impacts and Planetary Evolution; p 1-2
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  • 9
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    Mn-Cr isotopic systematics of Chainpur chondrules and bulk ordinary chondrites (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: We report on ongoing study of the Mn-Cr systematics of individual Chainpur (LL3.4) chondrules and compare the results to those for bulk ordinary chondrites. Twenty-eight chondrules were surveyed for abundances of Mn, Cr, Na, Fe, Sc, Hf, Ir, and Zn by INAA. Twelve were chosen for SEM/EDX and high-precision Cr-isotopic studies on the basis of LL-chondrite-normalized Mn(LL), Sc(LL), (Mn/Fe)(LL), and (Sc/Fe)(LL) as well as their Mn/Cr ratios. Classification into textural types follows from SEM/EDX examination of interior surfaces.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Papers Presented to the Conference on Chondrules and the Protoplanetary Disk; p 28-30
    Format: text
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  • 10
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    Rocket observations of the ultraviolet spectrum of comet Austin (1989c1) (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Long slit ultraviolet spectra of Comet Austin (1989c1) were obtained from a sounding rocket experiment launched from White Sands Missile Range, New Mexico, on 21 April 1990 at 1015 UT. The instrument, known as the Faint Object Telescope, consisted of f/15.5 Dall-Kirkham telescope, a Rowland Circle spectrograph and a microchannel plate intensifier coupled to a Reticon diode array. An onboard television camera transmitted images to the ground during flight, which permitted real-time maneuvers in order to center the comet in the entrance slit. The comet was held near the center of the slit for approximately 270 seconds by sending six pointing corrections, all but one of which was less than 30 arcseconds. The comet's parameters at the time of observation, along with the characteristics of the instrument, are given.
    Keywords: ASTROPHYSICS
    Type: Southwest Research Inst., Workshop on Observations of Recent Comets (1990); p 55-58
    Format: text
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