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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.
1-(1,5-Dimethylhexyl)-3a,5b,12a,14a-tetramethyl-2,3,3a,4,5,5a,5b,11,12,13,14,14a-dodecahydro-1H,12aH-cyclopenta[1,2]phenanthro[7,8-b]indole - López Rodríguez, Matías; Mazoir, Noureddine; Daoubi, Mourad; Reina, Matías; Benharref, Ahmed
The title compound, C35H51N, is a semi-synthesized derivative obtained from 4α,14α-dimethyl-5α-cholest-8-en-3β-ol, a major triterpene isolated from Euphorbia officinarum latex. The molecular structure was established by H-1 and C-13 NMR spectroscopy and confirmed as having the stereochemistry at the new C11b stereocenter by single-crystal X-ray diffraction. The planar indole group is folded over the extended tetracyclic perhydrocyclopentanephenanthrene triterpene skeleton. There are no π-π interactions between the indole ring systems.
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...
The response of the variety Abadia to added phosphorus and the intensity and the replenishment, factors of soils from the Ebro valley - Eleizalde Luzárraga, María Benigna; Alvarez, C. E.; Díaz, A.; García, V.
The relations between the uptake of phosphorus by a plant and fertility factors are studied. The wheat variety Abadia was grown under greenhouse at different levels of monocalcium phosphate according to the physico-chemical properties of the Brown Earths, Xerorendzines and Brown Soils, the soils in which these relations are evaluated.
There is a positive response to added P, with and increase in dry matter production and phosphorus content in this variety of wheat.
Both the dry matter production and the phosphorus content are related to the intensity factor, the maximum production being attained at concentration of 0.70 and 0.80 ppm in Brown...
Phosphorus uptake by Abadia variety wheat grown in soils of Ebro Valley - Eleizalde Luzárraga, María Benigna; García, V.; Díaz, Amalia; Alvarez, C. E.
Under greenhouse conditions the P uptake by wheat is studied and soil P extracted by three laboratory tests is compared.
In these soils the critical level of available P depends on the laboratory method used. Thus for the Burriel-Hernando extracting solution, it is 80 ppm while the method of Olsen gives a value of 60 ppm: the lowest concentration being obtained by the procedure of van der Paaw-Sissingh 40 ppm.
The regressions of plant yield on soil P extracted are studied to the critical level and equations are obtained which help to determine the amount to be applied to the soil. Differences...
Tolérance du bananier aux eaux bicarbonatées (eaux souterraines de Ténérife) - Fernández Caldas, E.; Pérez García, V.; Borges-Pérez, Andrés
Des eaux fortement bicarbonatées sont utilisées pour l'irrigation des bananeraies dans l'ile de Ténérife (Canarias). On étudie l'influence de ces eaux sur la formation éventuelle de sols salins ou alcalins. En dépit des caractéristiques chimiques de ces eaux, aucun de ces effets ne sont observés.
Étude comparative de la fertilité des sols de bananeraies aux îles Canaries - Fernández Caldas, E.; García, V.; Gutiérrez Jerez, Francisco José; Bravo Rodríguez, J. M.
Étude des différences et caractéristiques principales del sols de bananeraies des Îles Canaries. Données relatives aux influences climatiques sur ces caractéristiques pour les différentes îles et selon les versants dans chaque île. pH. CO3Ca et K présentent les plus grandes variations en fonction du climat et des matériaux d'origine.
Les réserves de potassium dans les sols de bananeraies aux Canaries - Fernández Caldas, E.; Borges-Pérez, Andrés
Eu égard aux besoins potassiques particulierement élevés du bananier, on a complété la détermination de K assimilable ou échangeable dans divers sols de Ténérife par celle de leurs réserves assimilables totales en potassium, au moyen d'extractions successives par C12Ca 0,01 N. Ces réserves, déja extraordinairement élevées dans deux parcelles ne recevant plus d'engrais potassique depuis 9 ans, proviennent de feldspaths potassiques. Elles sont en général encore supérieures dans les parcelles fertilisées annuellement a la potasse. L'étude selon HAGIN des variations d'energie libre montre en outre qu'il faut un appauvrissement tres pouseé pour atteindre le niveau de déficience de K vis-a-vis...
Discovery of a living giant lizard, genus Gallotia (Reptilia: lacertidae), from La Gomera, Canary Islands - Nogales, Manuel; Rando, J. Carlos; Valido, Alfredo; Martín, Aurelio
We describe the external morphology of a new giant lizard found alive on La Gomera Island (Canarian Archipelago), which had been previnusly described from subfossil bones. Adult size (SVI, 135-190 mm) is comparable with the two largest living species (G. simonyi and G. stehlini) of the genus. It differs from the other species of Gallotia in the low number of temporal scales (21-27), presence of one elougate interprefrontal scale (linearly depressed in center) that is very infrequent in most of its congeners (small when it is present), having two distinetive lateral lines of small blue spots, and in having a...
Discovery of a new lizard in the Canary Islands, with a multivariate analysis of Gallotia (Reptilia: Lacertidae) - Hernández, Efraín; Nogales, Manuel; Martín, Aurelio
We describe a new species of Gallotia from Tenerife (Canary Islands). This lizard is intermediate in size between the two smaller (G. atlantica and G. galloti) and the two larger (G. simonyi and G. stehlini) species. Furthermore, it differs from the two similar larger Gallotia in the number of supratemporal scales (mode 4 instead of mode 2), usually 16 longitudinal ventral scalerows, and having distinctive dorsal yellow spots, and small lateral yellow or blue spots. Individuals from a small population located in La Hábiga show a pale gray reticulation on dorsum and absence of ocelli in the lateral region. Univariate...