Development Threats to Biodiversity and Opportunities for Conservation in the Mountain Ranges of the Upper Bermejo River Basin, NW Argentina and SW Bolivia

Grau, Alfredo; Brown, Alejandro Diego

doi:10.1579/0044-7447-29.7.445

Cited by 61 publications

(38 citation statements)

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“…Las Yungas meridionales, o selvas TucumanoBolivianas se extienden desde los departamentos de Tarija, Chuquisaca y Santa Cruz en Bolivia hasta las provincias de Tucumán y Catamarca en la Argentina, conformando una sola unidad desde punto de vista biogeográfico, ecológico y social (Grau & Brown 2000;Brown et al 2001;Kessler & Beck 2001;Navarro & Maldonado 2002).…”

Section: Materiales Y Métodos áRea De Estudiounclassified

Revisión y análisis panbiogeográfico de las Hymenophyllaceae de las Yungas meridionales de Argentina (Selva Tucumano-Boliviana)

Arana

Larsen²,

Ponce³

2016

Rodriguésia

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ResumenHymenophyllaceae constituye uno de los linajes más tempranamente divergente dentro de los helechos, habitan lugares hiperhúmedos y su aparición se ha datado en el cretácico temprano, previa a la ruptura de Gondwana; estas características determinan que sean especialmente útiles para establecer patrones biogeográficos. En este trabajo se discuten la diversidad de la familia Hymenophyllaceae en las Yungas meridionales y sus vinculaciones biogeográficas, mediante un análisis panbiogeográfico. Se han encontrado nueve especies, comprendidas en cuatro géneros: Crepidomanes, Didymoglossum, Hymenophyllum y Polyphlebium; Crepidomanes pyxidiferum constituye una novedad florística a nivel genérico para Argentina. Se brindan una clave para todos los géneros de Hymenophyllaceae presentes en Argentina, así como claves entre todas las especies presentes en las Yungas, que además son descriptas e ilustradas. Palabras-clave: Crepidomanes, Dydimoglossum, Hymenophyllum, Polyphlebium, biogeografía. AbstractHymenophyllaceae represents a very ancient lineage of ferns that inhabit hyperhumid places and appeared in the Early Cretaceous, prior to the breakup of Gondwana; these features make Hymenophyllaceae especially useful to establish biogeographic patterns. The diversity of Hymenophyllaceae in meridional Yungas and their biogeographical relationships, employing a panbiogeographic analysis, are discussed. Nine species in four genera: Crepidomanes, Didymoglossum, Hymenophyllum and Polyphlebium were found; Crepidomanes pyxidiferum constitutes a novelty of generic level for Argentina. A key to all genera of Hymenophyllaceae present in Argentina are provided as well as keys for all species inhabiting the Yungas, which are also described and illustrated. The generalized track shows close relationships among the Argentine Yungas with the North Andes and the Parana dominion, overcoming the arid barrier represented by the Chacoan dominion. Furthermore, the South American Transition Zone constitutes a current barrier between the neotropical and the south-andean Hymenophyllaceae pteridofloras.

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Section: Materiales Y Métodos áRea De Estudiounclassified

Revisión y análisis panbiogeográfico de las Hymenophyllaceae de las Yungas meridionales de Argentina (Selva Tucumano-Boliviana)

Arana

Larsen²,

Ponce³

2016

Rodriguésia

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“…The predominant canopy vegetation is dominated by Blepharocalyx salicifolius (Myrtaceae), Ocotea porphyria (Lauraceae), and Pisonia ambigua (Nyctaginaceae); and understory tree composition (5-12 m) is dominated by Eugenia uniflora (Myrtaceae), Piper tucumanum (Piperaceae), and Allophylus edulis (Sapindaceae) [33]. The main economic activities that affect the Yungas are agriculture and livestock [17,34]. Dry Chaco is one of the largest forest biomes of Argentina.…”

Section: Study Areamentioning

confidence: 99%

Quality and Conservation of Riparian Forest in a Mountain Subtropical Basin of Argentina

Fernández

Ceballos

Achem

et al. 2016

International Journal of Ecology

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The aims of this work were to describe the conservation status of riparian forests located in a mountain subtropical basin of Tucumán province, Argentina, and assess how the quality of riparian forests is related with altitude, plant species richness, proportion of exotic species, and Total Suspended Solids (TSS) in adjacent rivers. Composition and species richness of riparian forests were studied at 16 sites located along an altitudinal gradient and TSS was determined from water samples collected in each site. In order to evaluate conservation status of riparian forests, we calculated an index of Quality of Yungas Riparian Forests (QBRy). We recorded 90 plant species at all sites, from which 77% were native. QBRy index was mainly associated with altitude and varied from riparian forests with good preservation or slightly disturbed to those with extreme degradation. At lower altitude, forests were more disturbed, more invaded by exotic plant species, and closer to urban and cropped areas. QBRy was not correlated with species richness or TSS. Like other riparian forests of Argentina, plant species invasion increased their degradation; therefore, future studies should focus on native riparian forests conservation and on the management of invasive plant species, which affect their quality.

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“…Despite agricultural modernization, the slash-andburn system is prevalent in tropical regions, such as Latin America (Grau and Brown, 2000;Silva-Forsberg and Fearnside 1997;Thomaz, 2013), Africa Ngo-Mbogba et al, 2015;Obale-Ebanga et al, 2003), and Asia (Bruun et al, 2009;Liao et al, 2015;Tanaka et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

High fire temperature changes soil aggregate stability in slash-and-burn agricultural systems

Thomaz¹

2017

Sci. agric. (Piracicaba, Braz.)

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Fire is a key controlling factor in ecosystem dynamics worldwide, especially, in tropical areas under slash-and-burn agricultural systems. Farmers use fire as a tool to clean the land, and benefit from nutrient enrichment from ash-soil heating. However, fire can cause some detrimental effects on soil systems, such as organic carbon depletion, increased soil erodibility, and changes to aggregate stability. In this study, an experimental fire was applied to a plot of land following the local traditional practice of slash-and-burn. The fire temperature was monitored in the field, and its effect on soil aggregate stability was assessed. The fire temperature on soil surface was measured in four trenches, and it ranged from 355 to 660 °C (average 484 ± 142 °C). The fire temperature did not affect soil organic matter content. However, aggregate stability increased by 10 % in comparison to unburned soil. Moreover, the geometric mean diameter of burned soil was 20 % higher than that of unburned soil. In conclusion, high fire temperature changes soil aggregate stability in slash-and-burn agricultural systems.

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Development Threats to Biodiversity and Opportunities for Conservation in the Mountain Ranges of the Upper Bermejo River Basin, NW Argentina and SW Bolivia

Cited by 61 publications

References 0 publications

Revisión y análisis panbiogeográfico de las Hymenophyllaceae de las Yungas meridionales de Argentina (Selva Tucumano-Boliviana)

Revisión y análisis panbiogeográfico de las Hymenophyllaceae de las Yungas meridionales de Argentina (Selva Tucumano-Boliviana)

Quality and Conservation of Riparian Forest in a Mountain Subtropical Basin of Argentina

High fire temperature changes soil aggregate stability in slash-and-burn agricultural systems

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