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Feeding ecology of feral cats on a heterogeneous subtropical oceanic island (La Palma, Canarian Archipelago) - Medina, Félix M.; García, Rafael; Nogales, Manuel
We found a total of 987 prey in the 500 scats of feral cats Felis silvestris catus Linnaeus, 1758 analyzed in the present study. Introduced mammals (rabbits, rats and mice) constituted the most important prey both in percentage and biomass. Reptiles were the second most important prey, being more frequent than birds and invertebrates. Mammals were the most frequently eaten group in all five main habitats of the island, being more frequent than the remainder of prey in the laurel forest. Rabbits appeared more often in the temperate forest, rats in the laurel forest and mice in the high mountain....
La sorción del fósforo en presencia de carbonato, bicarbonato y cloruro añadidos a suelos canarios - Baez, J.; Hernández Moreno, J. M.; Eleizalde Luzárraga, María Benigna; Fernández, M.
Phosphorus sorption in the presence of carbonate or bicarbonate or choride was studied in some soils of Tenerife.
The carbonate, bicarbonate and chloride anions were previously added to the soils at the 250$500 and 1000 ppm levels, leaving them to react during 15 days at field capacity.
After this time, solutions of phosphorus ranging from o to 1000 or 2000 ppm P as calcium disphosphate were added to the soil samples and shaken for 24 hours. Afeter filtering the soil suspensions, pH and phosphorus in the extract were measured. The P sorption curves differ widely as well as K1 and K2 values...
Retención de fósforo en suelos canarios en función del tiempo y concentación. III. A tiempo de 24 horas - Baez, J.; Alvarez, C. E.; Altares, M.; Eleizalde Luzárraga, María Benigna
That is a study related to the determination of maximum P adsorption and bindinging constant between P and some soils of Tenerife and Gran Canaria Islands. The shaking is 24 hours, after that P and pH are determined in soil extracts.
These parameters are evaluated by the Shapiro-Fried, maximum P adsorption values obtained are: (360-1300), (1075-2400), 2300-3000 ppm) for salinized soils, alfisol, oxisols and andosol respectively. The correlation coefficients between this parameter and Al, Al + Fe soluble forms in oxalate are significant at 2 and 5% levels.
It seems that in the oxisol of Poleo a secondary fixation was produced during...
The effect of irrigation with chlorinated and bicarbonated waters of high salinity on the yields of the yields of the rose bush - Díaz, A.; Fernández, M.; Eleizalde Luzárraga, María Benigna; Altares, M.
Since the application of poor-quality irrigation water is frequently the cause of the salinization of the soils given over to the cultivation of roses in Tenerife we carried out an irrigation trial with two waters of high salinity at concentrations of 15,70 meq/l of Cl-, and 13,60 meq/l of CO$H- respectively. Both types of water caused a significant reduction in the yields of the cultivar "Sonia", which was greater in the treatment with chlorinated water. The quality of the flower (expressed as a percentage of extra flowers) decreased considerably in the plants treated with bicarbonated water, and was reduced by...
Fertility and salinity conditions in Tenerife rose culture - Fernández, M.; Díaz, A.; García, V.; Eleizalde Luzárraga, María Benigna
Cultivation of roses for cutting flowers is increasing its importance in the Canary Islands. This paper is the beginning of a series of studies on the fertility of the soils and mineral nutrition of roses in the Iwsland of Tenerife.
The following ranges represent the most common chemical characteristics: pH: 5-7; O.M.: 5-6%; P2O5: 300-1300 ppm. Exchangeable cations: Na: 0.78-4.37 meq/100 gr.; Mg: 1.93-36 meq/100 gr. Ca: 10.62-26.60 meq/100 gr.; K: 2.94-7.93 meq/100 gr.
High concentrations of soluble salts are also observed. The E.C. of the saturation extract is greater than 2 mmhos/cm (25ºC) in most cases.
Respuesta del rye-grass al fósforo añadido en suelos del Valle del Ebro - Eleizalde Luzárraga, María Benigna
Under greenhouse conditions, the relation soil-P added and rye-grass yields grown in soils of Ebro valley Different about origin, ckay and lime contents is studied. With the purpose to detect if the maximun plant production is attained at the lexel x predected by laboratory procedures.
In the most of soils used it was found the maximum plant response at this laboratory index. Although there were only three soils, in which this rye-grass production was reached at level of P added higher than this x level predicted by laboratory methods.
The response of rye-grass to P added was also detected in the...
Respuesta del maíz a las aplicaciones de fósforo en un suelo pardo con tendencia fersialítica - Díaz Luis, P.; Eleizalde Luzárraga, María Benigna; García, V.; Díaz, Amalia
Under laboratory and greenhouse conditions the pattern of a soil which behaves like an alfisol, related to added P was studied.
The relation between applied P and that extracted from soil by the methods of Olsen and Bray-Kurtz were determined. With yhe procedure of Burriel-Hernando there were problems related to the development of the blue solour due to the interference of the high content of iron present in the soil extract.
In the grrehouse, maize was used like a biological assay. There was a positive response of this crop to P added to the soil (0 to 344 ppm P) since the...
Effect of potasium on salt tolerance plants irrigated with saline waters - Eleizalde Luzárraga, María Benigna; Larsen, S.
Under greenhouse conditions, the effect of potassium on the salt tolerance of tomato and pepper plants, irrigated with saline waters was studied.
these plants grown on sansy and calcareous soils, which have received 0.200 and 400 ppm of K previosly and an appropiate addition of 400 ppm P as monocalcium phosphate.
Duiring this trial, these crops were irrigated weekly at 60 % field holding capacity with two different types of saline waters and a suitable supply of a complete nutrient solution minus K and P.
Under all saline conditions developed by the irrigation, the potassium applied to soils help at the growth and...
Influence of the soil fertility factors on the P absorption of rey-grass grown in saline soils - Eleizalde Luzárraga, María Benigna; Fernández, M.; Díaz, P.
The relation between dry matter production of ry-grass and the intensity factor in the saline soils of the province of Saragossa (Spain) was studied. The maximum yield of rey-grass was attained at different levels of phosphorus in the soil solution. These values are from 3 to 12 ppm P.
The addition of phosphorus to these soils also improves the quality of rey-grass by increasing its P content. Furthermore the salinity present in the soil affects the phosphorus concentration in the soil solution necessary to obtain 0.60 % P in rey-grass. The intensity varies from 0.86 to 8 ppm P.
Efecto de la aplicación molíbdica sobre el rendimiento de maíz en suelo pardo con tendencia fersialítica - Díaz Luis, P.; Alvarez, C. E.; García, V.; Eleizalde Luzárraga, María Benigna
Under greenhouse conditions the response of maize to added Mo to an alfisol was studied.
It was followed and experiment with five treatments of P with three differnt amounts of Mo. which ranged from of = to 125 ppm P and from of 0 to 4 ppm Mo. respectively.
It was found that the phosphorus fertilization did not influence on the Mo desortion from this soil. In spite of the variable P concentrations. similar values of soil Mo where extracted by the ammonium oxalate procedure.
There was not improvement in the dry-matter production by the application of Mo. Although it was detected an...
Q/I ratio in saline soils belonging to Ebro Valley (Spain) - Eleizalde Luzárraga, María Benigna; Fernández, M.
The Q/I ratios of contrasting soils of the Saragossa Province (Spain) were studied. Samples of the soils were treated with varying quantities of a monocalcium phosphate solution to yield ranges of 0 to 400 ppm applied P. The samples were incubated at saturation for one week, after which they were placed in Buchner funnles. P was determined in water extracts obtained by suction.
These quantities of P were plotted against the amounts of applied phosphorus and the resulting P-sorption curves were found to differ widely among soils.
The results obtained were significantly affected by the nature and the concentration of slats...
Seasonal diet of the Grey Heron Ardea cinerea on an oceanic island (Tenerife, Canary Islands): indirect interaction with wild seed plants - Rodríguez, Airam; Rodríguez, Beneharo; Rumeu, Beatriz; Nogales, Manuel
A total of 7460 prey items were counted in the 199 pellets analysed, of which 96.2% corresponded to arthropods. Aeshnidae larvae (Odonata) made up 66.1% of total prey items and were the main invertebrate group. Vertebrates constituted 3.8%, while reptiles and mammals were the main prey (1.8%, respectively). Despite the small size of the invertebrates, this group reached > 60% in terms of biomass. All main prey items varied significantly among seasons. Odonata was the most important group for all seasons, reaching its maximum value in summer. In the case of vertebrates, reptiles were mainly captured in spring and mammals...
Prey size selection of insular lizards by two sympatric predatory bird species - Pérez Padilla, David; Nogales, Manuel; Marrero, Patricia
Size-related selection of insular lizards by two sympatric predatory bird species (Southern Grey Shrike and Eurasian Kestrel) was studied in an arid insular environment. The endemic lizard genus Gallotia was a key resource in the diet of both predators, constituting more than 50% of the total biomass. Shrikes captured smaller lizards than kestrels during all seasons (mean snout-vent length (SVL): 7.4 ± 1.9 vs. 9.4 ± 2.1 cm respectively), presenting a sequential use of lizard sizes and avoiding potential competition. On the other hand, shrikes and kestrels showed the same seasonal variation pattern, capturing the largest lizards during their breeding...
Breeding biology of Grey Wagtail Motacilla cinerea canariensis on Tenerife, Canary Islands - Rodríguez, Beneharo; Rodríguez, Airam
The paper reports on the breeding biology of the endemic subspecies of the Grey Wagtail in a human
transformed area (banana plantations) on Tenerife (Canary Islands). Clutch size (3.96 ± 0.6) was lower than in continental zones, probably because of the climatic stability of the islands. Furthermore, the distance from the nest to the nearest water source and the length of the breeding season (late February–June) were greater than in other European populations. Some breeding traits fit the predictions of the so-called insular “syndrome”. Possible mechanisms
underpinning these differences in breeding traits are discussed.
Elenoside increases intestinal motility - Navarro, Eduardo; Alonso, Jesús; Navarro, Ricardo; Trujillo, Juan M.; Jorge, Elena
[Aim] To study the effects of elenoside, an arylnaph-thalene lignan from Justicia hyssopifolia, on gastro-intestinal motility in vivo and in vitro in rats.
First breeding record of Macaronesian Shearwater Puffinus Baroli Baroli in El Hierro (Canary Islands) - Rodríguez, Airam; Pérez Padilla, David
Breeding biology of Macaronesian Shearwater is not well known, especially in the Atlantic Ocean (MOUGIN et al., 1992; ZINO & BISCOITO, 1994). In the Canary Islands, only some isolated breeding data are available, but, it is assumed that the majority of laying occurs in January and February, although later birds could lay on May
(see MARTÍN & LORENZO, 2001). In other areas, the
chronology and total length of the breeding period is rather variable (SNOW, 1965; WARHAM, 1990; MOUGIN et al., 1992; BOOTH et al., 2000;
BRETAGNOLLE et al., 2000). At the moment, in this
archipelago, breeding has been confirmed in
Tenerife, La Gomera, Lanzarote...