Velocidad de respuesta al cambio climático de las especies del género «Viola» en la alta montaña de Canarias

2021 ◽  
pp. 16-19
Author(s):  
VÍCTOR BELLO-RODRÍGUEZ ◽  
JONAY CUBAS ◽  
MARCELINO J. DEL ARCO ◽  
JOSE L. MARTÍN ESQUIVEL ◽  
MANUEL V. MARRERO-GÓMEZ ◽  
...  
Keyword(s):  
La Palma

El género Viola es uno de los más amenazados por el cambio climático y los herbívoros invasores en la alta montaña de Canarias, estando representado actualmente por los endemismos insulares V. palmensis (La Palma), y V. cheiranthifolia y V. guaxarensis (Tenerife). En este trabajo se ha modelizado la distribución potencial de estas tres especies en distintos escenarios climáticos, con novedades como la incorporación de modelos hacia el pasado (período 1959-1989) y del cálculo de velocidad de respuesta al cambio climático para cada especie. Los resultados reflejan que en las últimas décadas V. guaxarensis ha perdido un 22,7% de superficie potencial y más de un 40% para V. palmensis y V. cheiranthifolia. Las proyecciones hacia el futuro son especialmente preocupantes para estas dos últimas especies, dado que tienden a reducir su área de distribución potencial en los sectores más elevados de ambas islas, los cuales se convertirán en sumideros de biodiversidad. La velocidad con la que las especies deben migrar para compensar estos cambios es mayor cuando se ven obligadas a salvar grandes depresiones para encontrar su nicho, tal y como se prevé que ocurra en el futuro con V. guaxarensis cuya idoneidad de hábitat está centrada en el Teide. En base a estos resultados se propone el reforzamiento de las poblaciones, el control y/o erradicación de herbívoros y traslocaciones.

Prevalencia de la esclerosis lateral amiotrófica en la isla de La Palma, España

1998 ◽  
Vol 26 (154) ◽  
pp. 1077
Author(s):  
Pablo Villagra Cocco ◽  
Ariel Villagra Cocco
Keyword(s):  
La Palma

scholarly journals Imaging Spectroscopy of Flows in Active Regions

1993 ◽  
Vol 141 ◽  
pp. 542-544
Author(s):  
P. Mein ◽  
N. Mein
Keyword(s):  
Imaging Spectroscopy ◽  
Active Regions ◽  
Dynamical Model ◽  
La Palma ◽  
Simple Dynamical Model

AbstractWe use imaging spectroscopy from the MSDP of the VTT telescope in Tenerife (collaboration Paris-Meudon Observatory and Kiepenheuer Institut) to analyse Doppler velocities of arch filaments in Hα and NαD1. The geometry of the magnetic loops is deduced from perspective effects with a simple dynamical model. Velocities are correlated in both lines.Further results are expected from simultaneous observations with other instruments (SVST of La Palma and Huairou magnetograph).

scholarly journals Paleomagnetism and40Ar/39Ar ages from La Palma in the Canary Islands

2000 ◽  
Vol 1 (9) ◽  
pp. n/a-n/a ◽  
Author(s):  
Lisa Tauxe ◽  
Hubert Staudigel ◽  
Jan R. Wijbrans
Keyword(s):  
Canary Islands ◽  
La Palma

Grazing effects on species composition in different vegetation types (La Palma, Canary Islands)

2011 ◽  
Vol 37 (3) ◽  
pp. 230-238 ◽  
Author(s):  
J.R. Arévalo ◽  
L. de Nascimento ◽  
S. Fernández-Lugo ◽  
J. Mata ◽  
L. Bermejo
Keyword(s):  
Species Composition ◽  
Canary Islands ◽  
Vegetation Types ◽  
La Palma ◽  
Grazing Effects

Diffuse H2 degassing studies: a useful geochemical tool for monitoring Cumbre Vieja volcano, La Palma, Canary Islands

2021 ◽  
Author(s):  
Nemesio M. Pérez ◽  
Gladys V. Melián ◽  
Pedro A. Hernández ◽  
María Asensio-Ramos ◽  
Eleazar Padrón ◽  
...  
Keyword(s):  
Canary Islands ◽  
Emission Rate ◽  
Monitoring Program ◽  
Hydrothermal Systems ◽  
Sequential Gaussian Simulation ◽  
Homogeneous Distribution ◽  
La Palma ◽  
Soil Degassing ◽  
Geothermal Activity ◽  
Cumbre Vieja

<p>Hydrogen (H<sub>2</sub>) is one of the most abundant trace species in volcano-hydrothermal systems and is a key participant in many redox reactions occurring in the hydrothermal reservoir gas. Although H<sub>2</sub> can be produced in soils by N<sub>2</sub>-fixing and fertilizing bacteria, soils are considered nowadays as sinks of molecular hydrogen (Smith-Downey et al. 2006). Because of its chemical and physical characteristics, H<sub>2</sub> generated within the crust moves rapidly and escapes to the atmosphere. These characteristics make H<sub>2</sub> one of the best geochemical indicators of magmatic and geothermal activity at depth. Cumbre Vieja volcano (La Palma, Canary Islands) is the most active basaltic volcano in the Canaries with seven historical eruptions being Teneguía eruption (1971) the most recent one. Cumbre Vieja volcano is characterized by a main north–south rift zone 20 km long, up to 1950 m in elevation and covering an area of 220 km<sup>2</sup> with vents located at the northwest and northeast. Cumbre Vieja does not show any visible degassing (fumaroles, etc.). For that reason, the geochemical volcano monitoring program at Cumbre Vieja volcano has been focused on soil degassing surveys.  Here we show the results of soil H<sub>2</sub> emission surveys that have been carried out regularly since 2001. Soil gas samples were collected in about 600 sampling sites selected to obtain a homogeneous distribution at about 40 cm depth using a metallic probe and 60 cc hypodermic syringes and stored in 10 cc glass vials. H<sub>2</sub> content was analysed later by a VARIAN CP4900 micro-GC. A simple diffusive emission mechanism was applied to compute the emission rate of H<sub>2</sub> at each survey. Diffuse H<sub>2</sub> emission values were used to construct spatial distribution maps by using sequential Gaussian simulation (sGs) algorithm, allowing the estimation of the emission rate from the volcano. Between 2001-2003, the average diffuse H<sub>2</sub> emission rate was ∼2.5 kg·d<sup>−1</sup> and an increase of this value was observed between 2013-2017 (∼16.6 kg·d<sup>−1</sup>), reaching a value of 36 kg·d<sup>−1</sup> on June 2017, 4 month before the first recent seismic swarm in October, 2017 at Cumbre Vieja volcano. Six additional seismic swarms had occurred at Cumbre Vieja volcano (February 2018, July-August 2020; October 8-10, 2020; October 17-19, 2020, November 21, 2020 and December 23-26, 2020) and changes of diffuse H<sub>2</sub> emission related to this unrest had been observed reaching values up to ∼70 kg·d<sup>−1</sup>. Diffuse H<sub>2</sub> emission surveys have demonstrated to be sensitive and excellent precursors of magmatic processes occurring at depth in Cumbre Vieja. Periodic diffuse H<sub>2</sub> emission surveys provide valuable information to improve and optimize the detection of early warning signals of volcanic unrest at Cumbre Vieja volcano.</p>

scholarly journals Geochemical and Volcanological Evolution of La Palma, Canary Islands

2017 ◽  
Vol 58 (6) ◽  
pp. 1227-1248 ◽  
Author(s):  
Andreas Klügel ◽  
Karsten Galipp ◽  
Kaj Hoernle ◽  
Folkmar Hauff ◽  
Simon Groom
Keyword(s):  
Canary Islands ◽  
La Palma
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