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Open Access item Animal influences on soil properties and plant cover in the Chafarinas Islands (NW Africa).
|Authors:||García, Luis V.|
Clemente Salas, Luis
|Keywords:||Seabirds, Rabbits, Soil salinity, Soil fertilization, Bare soil, Standing crop, Soil erosion|
|Citation:||Proceedings International Congress of the European Society of Soil Conservation|
Man and Soil at the Third Millenium Volume I: 705-712 (2002)
|Abstract:||Seagull and rabbit proliferation in the Chafarinas Islands (three small semiarid
islets in NW Africa) has produced significant changes in physical and chemical properties
of the soil, as well as in plant cover. Analysis of preliminary data has shown that
soils in areas with a strong seabird influence were significantly higher in soluble salts
(electrical conductivity), macronutrients (total N, nitrate, phosphorous, potassium and
magnesium), and organic carbon, than soils located in areas with low seabird influence.
Water and nutrient retention capacity (related to saturation percentage) and bioavailability
of some heavy metal (Zn, Fe, Cd) were increased significantly in seabirdaffected
soils. No significant differences in other soil properties (such as soil texture
or carbonate contents) were found between seabird-affected and -unaffected areas. On
the other hand, percent of bare soil was significantly higher in seabird-affected areas,
whereas shrub cover was significantly decreased in those areas. Rabbit grazing (but
not seabird presence) strongly reduced above-ground biomass of herbaceous species
and soil seed bank density. As long as high seabird density and rabbit pressure significantly
reduce plant cover andlor biomass and increase percentage of bare soil, they
are relevant factors in conservation strategies of semiarid protected areas.
Management practices should be implemented to protect these arid, steep and shallow
soils against water erosion.|
|Description:||9 páginas, 1 figura, 3 tablas. El congreso tuvo lugar en Valencia, del 28 de marzo al 1 de abril de 2000. We thank Georgina Álvarez for the organization support, Tomás Gómez, Manolo
Igual, Jesús Charco, and Paco Robles for field assistance, José M" Alegre for processing plant samples, Rafael López and the IRNAS Analysis Lab staff for chemical analyses, and J. Cara for his help with data and manuscript processing.|
|Appears in Collections:||(IRNAS) Artículos|
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