Papers by Guillermo José Martínez Pastur
Conservation …, 2012
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Tree physiology, 2012
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INTERCIENCIA- …, 2002
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… y Patrimonio en …, 2005
... Signatura : 05004216403. Localización. YSC, EEA Santa Cruz. Aut. Analit.: Martínez Pastur, Gu... more ... Signatura : 05004216403. Localización. YSC, EEA Santa Cruz. Aut. Analit.: Martínez Pastur, Guillermo J.; Peri, Pablo Luis; Vukasovic, Ricardo Fabián; Cellini, Juan Manuel; Lencinas, María Vanesa; Gallo, Emilce. Tít. ... P.imprenta : UNPA. Río Gallegos. AR. 2005. p. 260-271. ...
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… . 2. 2008 04 22-24, 22 …, 2008
... Signatura: 946.2 62. Localización: DF. Aut. Analit.: Peri, PL; Bahamonde, HA; Monelos, LH. Tí... more ... Signatura: 946.2 62. Localización: DF. Aut. Analit.: Peri, PL; Bahamonde, HA; Monelos, LH. Tít. Analit.: Producción de hojarasca en bosques primarios y bajo manejo silvopastoril de Nothofagus antarctica en la provincia de Santa Cruz, Argentina. ...
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Biodiversity & Conservation, 2005
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Forest Ecology and Management, 2007
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Forestry, 2006
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New Forests, 2007
An in vitro rooting protocol for producing Nothofagus nervosa microplants using successive steps ... more An in vitro rooting protocol for producing Nothofagus nervosa microplants using successive steps during tissue culture is reported. Qualitative and quantitative changes in putrescine, spermidine, and spermine tissue contents, during the rooting process and their correlation with other biochemical markers and morphological changes, provided the rationale for their use during the study of a successive in vitro culture protocol for N. nervosa, as well as the use of their inhibitors. The polyamine tissue content was maximum before root emergence (spermine raised to 100 nmol/g FW to later decreased to ca. 50 nmol/g FW in the following days), but it was lower in improved rooting media (197 nmol/g FW compared to 264 nmol/g FW of the control medium). It was concluded that polyamines qualitatively and quantitatively improve in vitro rhizogenesis, and the best successive culture media included 10 μM spermine during the expression phase. En este trabajo se presenta un protocolo de enraizamiento in vitro para la obtención de micro-plantas de Nothofagus nervosa usando medios sucesivos durante el cultivo de tejidos. Los cambios cualitativos y cuantitativos de putrescina, espermidina y espermina en los tejidos durante el enraizamiento, y su correlación con otros marcadores bioquímicos y cambios morfológicos, justifican su uso en el desarrollo de medios sucesivos de enrizamiento para N. nervosa, así como el uso de sus inhibidores. La concentración de poliaminas en los tejidos fue máxima antes de la emergencia de las raíces (espermina alcanzó los 100 nmol/g PF para decrecer hasta 50 nmol/g PF en los días siguientes), siendo su concentración menor en los mejores medios de enraizamiento (197 nmol/g PF comparado con 264 nmol/g PF del medio control). Se puede concluir que las poliaminas mejoran cualitativamente y cuantitativamente el enraizamiento in vitro, siendo el mejor medio sucesivo aquel que incluyó 10 µM de espermina durante la fase de expresión del enraizamiento.
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Revista Chilena De Historia Natural, 2010
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... María Vanessa LENCINAS1 Guillermo MARTÍNEZ-PASTUR2*# Pablo Luis PERI34* María Cecilia FERNÁND... more ... María Vanessa LENCINAS1 Guillermo MARTÍNEZ-PASTUR2*# Pablo Luis PERI34* María Cecilia FERNÁNDEZ24* . ... Area bajo estudio Se trabajó en un bosque puro de N. pumilio (Lenga) en la Ea San Justo (Tierra del Fuego - Argentina) (54° 06' LS, 68° 37' LO), donde el ...
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Journal of Technology …, 2007
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Forest Ecology and Management, 2009
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New Zealand Journal of Botany, 2003
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Bosque (valdivia), 2007
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Forest Ecology and Management, 2009
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Fuel and Energy Abstracts, 2011
The sub-Antarctic biome of South America is the world's southernmost forested ecosystem and one o... more The sub-Antarctic biome of South America is the world's southernmost forested ecosystem and one of the last remaining wilderness areas on the planet. Nonetheless, the region confronts various anthropogenic environmental impacts, such as the invasive North American beaver (Castor canadensis) and timber harvesting, particularly in stands of Nothofagus pumilio. Both of these disturbances can affect terrestrial and aquatic systems. To understand the influence and relative importance of these disturbances on sub-Antarctic watersheds, we characterized in-stream and riparian habitat conditions (pH, dissolved oxygen, conductivity, temperature, stream size, distance to riparian forest, bank slope, substrate heterogeneity, benthic organic matter) and benthic macroinvertebrate community structure (density, richness, diversity, evenness) and function (biomass, functional feeding group percent) in 19 streams on Tierra del Fuego Island. To explain the effects of beaver invasion and timber harvesting, we compared these physical and biotic variables among four habitat types: (a) beaver meadows, (b) shelterwood cut harvested areas without forested riparian zones, (c) variable retention harvested areas with riparian buffers, and (d) unmanaged old-growth primary forests. Most habitat variables were similar at all sites, except for dissolved oxygen (significantly higher in streams from old-growth primary forests). Benthic communities in beaver meadows had significantly lower diversity, compared to streams of unmanaged old-growth primary forests, and managed sites presented intermediate values between the two. Functionally, the benthic community in beaver meadows displayed a reduction of all functional feeding groups except collector-gatherers; again variable retention harvested areas with riparian buffers were similar to unmanaged old-growth primary forest streams, while shelterwood cut harvested areas occupied an intermediate position. These results indicated that current forestry practices that include both variable retention and legally mandated riparian forested buffers may be effective in mitigating impacts on stream benthic communities. Finally, these data demonstrated that C. canadensis invasion was a relatively larger impact on these streams than well-managed forestry practices.► Tierra del Fuego hosts the world's southernmost forests, still relatively pristine. ► Fuegian Nothofagus forests face disturbance from forestry and invasive beavers. ► Well-managed timber harvesting did not have significantly altered benthic communities. ► Beaver invasion was a relatively larger impact to streams than forestry.
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Fuel and Energy Abstracts, 2011
Understory plants could can act as indicators of temperate forest sustainability, health and cons... more Understory plants could can act as indicators of temperate forest sustainability, health and conservation status due to their importance in ecosystem function. Harvesting impacts on understory plant diversity depends on their intensity. Variable retention has been proposed to mitigate the harmful effects of timber harvesting, but its effectiveness remains unknown in southern Patagonian Nothofagus pumilio forests. The objectives of this study were to: (i) define a baseline of understory plant diversity in old-growth forests along a site quality gradient and under canopy gaps; (ii) evaluate stands with three different variable retention treatments compared to old-growth forests; and (iii) assess temporal changes during 4 years after harvesting (YAH). A 61 ha N. pumilio forest was selected. Understory plant (Dicotyledonae, Monocotyledonae and Pteridophyta) richness, cover (including woody debris and bare forest floor) and aboveground dry biomass were characterized in summer for 5 years. Before harvesting, baseline samples were conducted along a site quality gradient and outside/inside canopy gaps. Analyzed treatments include a control of old-growth forest (OGF) and three different harvesting treatments with variable retention: (i) dispersed retention (DR) of 30 m2 ha−1 (20–30% retention); (ii) aggregated retention (AR) with one aggregate per hectare and clear-cuts (28% retention); and (iii) combined dispersed and aggregated retention (DAR) with one aggregate per hectare and dispersed retention of 10–15 m2 ha−1 (40–50% retention). Data analyses included parametric and permutational ANOVAs, multivariate classification and ordinations.Before harvesting, 31 plant species were found, where richness, cover and biomass were directly related to site quality. The presence of canopy gaps did not have a significant impact on the measured variables. After harvesting, 20 new species appeared from adjacent associated environments (two from N. antarctica forests and 18 from grasslands and peatlands). At the stand level, understory values were higher in AR > DR > DAR > OGF. Most (81–95%) plant richness at baseline conditions was conserved in all treatments, where inside the aggregates understory remained similar to OGF. Combination of aggregated and dispersed retention (DAR) better limited exotic species introduction and protected sensitive species, improving conservation in harvested stands. Changes in understory variables were observed after the first YAH in all treatments; greater changes were observed in the harvested areas than in aggregates. Changes stabilized at the fourth YAH. As a conclusion, the location of retention aggregates should be selected to preserve species understory diversity of more speciose and diverse habitats or particularly uncommon stands. Implementation of different kinds (patterns and levels) of retention for improvement of biodiversity conservation in harvested forests should be included in timber and forest management planning.► Understory plant diversity before harvesting was directly related to site quality. ► Variable retention impacts over plant diversity by species incorporation and loss. ► Understory remains similar to old-growth forests inside aggregates. ► Combination of retention patterns improves conservation in harvested stands. ► Temporal changes occur in understory diversity of harvested and old-growth forests.
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Papers by Guillermo José Martínez Pastur