Gestion Del Medio Rural de Canarias

Las Palmas de Gran Canaria, Spain

Gestion Del Medio Rural de Canarias

Las Palmas de Gran Canaria, Spain
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Mora J.L.,University of Zaragoza | Arbelo C.D.,University of La Laguna | Rodriguez-Rodriguez A.,University of La Laguna | Notario J.S.,University of La Laguna | And 2 more authors.
European Journal of Soil Science | Year: 2012

The present study investigated the content of Al and various heavy metals (Cr, Cu, Fe, Mn, Ni and Zn) in soils and plant tissues of a sub-tropical laurel forest in the Canary Islands and their relationship to the composition and structure of the forest. The content of different Al-fractions and bioavailable (NH4Ac-EDTA extractable) metals was analysed in a large number of soil samples and related to lithological and topographic factors. Seasonal variation of the metal content in the soil, phytomass and litter was studied at sites with different degrees of maturity or sites affected by forest dieback. Extremely large contents of bioavailable Al, Fe and Mn were observed in soils. The Al and Mn contents exert a considerable influence on ecosystem composition. The results of this study reveal the bioaccumulation of Al in Ilex canariensis Poir. and Viburnum rigidum Vent. and suggest the accumulation of Mn in Laurus novocanariensis Rivas Mart. The bioaccumulation patterns of Al were closely related to the NH4Ac-EDTA-extractable soil content but not as closely tied to KCl-extractable Al, suggesting the greater importance of humic complexes in the regulation of aluminium toxicity in comparison with hydroxy-Al interlayered 2:1 silicates. Bioaccumulation gives rise to Al-rich litterfall inputs, allowing the exclusion of Al-intolerant species from the understory or neighbouring vegetation. © 2012 The Authors. Journal compilation © 2012 British Society of Soil Science.


Armas-Herrera C.M.,University of La Laguna | Mora J.L.,University of Zaragoza | Guerra J.A.,Gestion del Medio Rural de Canarias | Arbelo C.D.,University of La Laguna | Rodriguez-Rodriguez A.,University of La Laguna
Soil Use and Management | Year: 2013

Although Andosols are relatively resistant to water erosion, they can be severely affected by changes in land use, resulting in accelerated erosion and loss of soil organic matter (SOM). We hypothesized that if the contents of specific components of SOM and organo-metallic complexes (humic acids -HAs-, fulvic acids -FAs-, sodium pyrophosphate extractable carbon -Cp-, aluminium -Alp-, and iron -Fep-) consistently tend towards certain ratios in A and B horizons, they could be used to identify soils denuded by erosion. To test this hypothesis, we investigated the vertical distribution of humus components and certain ratios, namely C-HA/C-FA, C-FA/total organic C (TOC), Cp/TOC and (Fep + Alp)/C-FA, in representative profiles of andic soils located in natural ecosystems with different degrees of human disturbance. Furthermore, we analysed these parameters in the topsoil of a natural protected area and in adjacent soils under different land use scenarios (natural reserve vs. traditional exploitation). We found that the ratios of C-HA/C-FA and, to a lesser extent, of C-FA/TOC and Cp/TOC changed with depth in the selected soil profiles, but the values were characteristic of each type of soil horizon. The values of these ratios in the topsoils of the disturbed areas were closer to a B horizon than an A horizon. This pattern may be superimposed on pre-existing gradients, such as those related to the type of natural vegetation. The use of these indices emerges as a possible land use and erosion indicator. © 2012 The Authors. Journal compilation © 2012 British Society of Soil Science.


Mora J.L.,University of Zaragoza | Armas-Herrera C.M.,University of La Laguna | Guerra J.A.,Gestion del Medio Rural de Canarias | Rodriguez-Rodriguez A.,University of La Laguna | Arbelo C.D.,University of La Laguna
Journal of Arid Environments | Year: 2012

We investigated whether human-induced soil degradation may hinder the regeneration of a semiarid Mediterranean-type ecosystem with high biodiversity and conservation interest on the Canary Islands. To further this aim, the replacement of plant species and life-forms and the variation in soil quality were studied during the process of succession in old fields abandoned at different times and in relicts of the original thermophilous woodland by means of multivariate techniques of ordination (RDA, DCA, CCA) and clustering (k-means + IndVal). The studied ecosystem showed a limited capacity for recovery, which appears to be lower than in other similar semiarid Mediterranean ecosystems. Soil parent material exerted a considerable influence on plant reestablishment, and this process was more efficient with pumice-type rocks. Human activities have given rise to a loss of soil organic matter and an enrichment of certain nutrients, which revert to their normal levels once disturbance ceases. However, the erosion resulting from ploughing, farming and subsequent land abandonment has resulted in irreversible degradation of the soil water regime, thus severely limiting the restoration of the original ecosystem. We concluded that aridification due to soil degradation may, in certain cases, prevent the complete regeneration of thermophilous woodlands of the Canary Islands, and it must be taken into account when performing restoration activities. Pumice mulch can be useful for restoration, as it provides a suitable substrate in key stages of the plant recolonisation process. © 2012 Elsevier Ltd.


Castro J.J.,University of Las Palmas de Gran Canaria | Hernandez-Garcia V.,University of Las Palmas de Gran Canaria | Santana-Ortega A.T.,University of Las Palmas de Gran Canaria | Perez-Gonzalez Y.,Gestion Del Medio Rural de Canarias | And 3 more authors.
Crustaceana | Year: 2010

Two exploratory trap fishing surveys were carried out from February to April and from June to July 2003, respectively, at depths ranging between 300 and 1200 m, with the objective to assess deep fishery resources of the Canary Archipelago. Despite the fact that the deep-water red crab, Chaceon affinis is a virtually unknown species for the artisanal fishermen of the islands, it was relatively frequent in catches, as an indication of its abundance in deep waters off the archipelago. This crab was captured in the whole range of depths sampled, although its highest abundance was found between 600 and 800 m, on muddy-rocky bottoms. Moreover, significant differences were observed in the average weight and length, according to depth of capture, island of origin, and date of survey. In general, the b parameter of length-weight relationship indicates a negative allometric growth pattern, although in some cases it was not statistically different from isometry, particularly in males. Males were heavier, larger, and more abundant in catches than females. © 2010 Koninklijke Brill NV, Leiden.


Marti-Trujillo J.A.,University of Las Palmas de Gran Canaria | Santana-Ortega A.T.,University of Las Palmas de Gran Canaria | Santana-Artiles G.,University of Las Palmas de Gran Canaria | Hernandez-Garcia V.,University of Las Palmas de Gran Canaria | And 2 more authors.
Crustaceana | Year: 2014

The box crab (Paramola cuvieri) was relatively frequent in trap catches from 288 to 906 m depth off the Canary Islands (central-east Atlantic), the greatest abundance being recorded between 400 and 700 m. From winter to the beginning of summer, a displacement of adult crabs from deeper waters (800 m) to areas of intermediate depths (600 m) was noted, probably due to reproductive requirements. Although no significant difference was observed in the depth distribution by sexes, larger females were generally caught at shallower depths and ovigerous specimens were mainly caught in the 350-400 m depth interval. Males were heavier, larger, and broader than females, but they were less abundant. © Koninklijke Brill NV, Leiden.

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